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mitsubishi-MXZ-3C24NA2-U1-service-manual_Sun_May_30_2021_18-09-21HFCutilized R410A TM PARTS CATALOG (OBB702) INDOOR UNIT SERVICE MANUAL OUTDOOR UNIT Models MXZ-3C24NA MXZ-3C24NA2 - U1 MXZ-3C30NA MXZ-3C30NA2 - U1 MXZ-4C36NA MXZ-4C36NA2 - U1 MXZ-5C42NA MXZ-5C42NA2 - U1 MXZ-2C20NAHZ MXZ-2C20NAHZ2 - U1 MXZ-3C24NAHZ MXZ-3C24NAHZ2 - U1 MXZ-3C30NAHZ MXZ-3C30NAHZ2 - U1 No. OBH702 REVISED EDITION-C Please void OBH702 REVISED EDITION-B.Revision C:• 3. SPECIFICATION has been corrected.• Some descriptions have been modified. Indoor unit service manual MSZ-FE·NA Series (OBH542) MSZ-GE·NA Series (OBH548) MFZ-KA·NA Series (OBH568) SEZ-KD·NA Series PLA-A·BA Series (OCH420) PCA-A·KA Series (OCH455) PEAD-A·AA Series SLZ-KA·NA Series (OCH487) MSZ-FH·NA Series (OBH683) MVZ-A·AA Series MSZ-GL·NA Series (OBH732) MSZ-EF·NA Series (OBH736) MFZ-KJ·NA Series (OBH752) MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2 CONTENTS 1. TECHNICAL CHANGES ··································· 4 2. PART NAMES AND FUNCTIONS ····················· 5 3. SPECIFICATION ················································ 6 4. NOISE CRITERIA CURVES ···························· 13 5. OUTLINES AND DIMENSIONS ······················ 15 6. WIRING DIAGRAM ·········································· 20 7. REFRIGERANT SYSTEM DIAGRAM ············· 30 8. DATA ································································ 41 9. ACTUATOR CONTROL ··································· 63 10. SERVICE FUNCTIONS ···································· 64 11. TROUBLESHOOTING ····································· 66 12. DISASSEMBLY INSTRUCTIONS ···················· 87 INDOOR UNITS COMBINATION TABLES 2 Use the speciﬁ ed refrigerant onlyNever use any refrigerant other than that specified.Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.Correct refrigerant is specified in the manuals and on the spec labels provided with our products.We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added. Revision B: • MXZ-3C24/3C30/4C36/5C42NA2 and MXZ-2C20/3C24/3C30NAHZ2-U1 have been added. Revision C: • 3. SPECIFICATION has been changed. • Some descriptions have been modified. OBH702C 3OBH702C 4 TECHNICAL CHANGES1MXZ-5C42NAMXZ-2C20NAHZMXZ-3C24NAHZMXZ-3C30NAHZ 1. New model MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 1. New model MXZ-3C24NA MXZ-3C24NA2 -U1 MXZ-3C30NA MXZ-3C30NA2 -U1 MXZ-4C36NA MXZ-4C36NA2 -U1 MXZ-5C42NA MXZ-5C42NA2 -U1 MXZ-2C20NAHZ MXZ-2C20NAHZ2 -U1 MXZ-3C24NAHZ MXZ-3C24NAHZ2 -U1 MXZ-3C30NAHZ MXZ-3C30NAHZ2 -U1 1. Outdoor control P.C. board has been changed. OBH702C 5 PART NAMES AND FUNCTIONS2 MXZ-5C42NA MXZ-5C42NA2 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C24NA MXZ-3C24NA2MXZ-3C30NA MXZ-3C30NA2MXZ-4C36NA MXZ-4C36NA2 Air outlet Drain outlet Air inlet (Back and side) Air outlet Drain outlet Air inlet (Back and side) OBH702C 6 NOTE: Test conditions are based on ARI 210/240. SPECIFICATION3ItemOutdoor model MXZ-3C24NA MXZ-3C24NA2Indoor type Non-Duct (06+09+09)Duct (09+09+09)Capacity Cooling *1 Btu/h 22,000 23,600Heating 47 *1 Btu/h 25,000 24,600 Heating 17 *2 Btu/h 19,600 19,600 Power consumption Cooling *1 W 1,620 2,100 Heating 47 *1 W 1,750 1,900 Heating 17 *2 W 2,580 2,440 EER Cooling 13.6 11.2 SEER Cooling 20.0 16.0 HSPF IV(V) Heating 9.8 (7.6)9.2 (7.6) COP Heating 4.20 3.80 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 25 Min. circuit ampacity A 22.1 Fan motor F.L.A 2.43 Compressor Model SNB220FQGMC Winding resistance (at 68 ºF)Ω U-V 0.95 V-W 0.95 W-U 0.95 R.L.A 12 L.R.A 13.7 Refrigerant control LEV Sound level dB(A)51/55 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.31-11/32 Weight lb.NA: 135/NA2: 137 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A:1/2 B,C:3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.6lb. 13oz. Refrigeration oil (Model)ﬂ oz. (L)23.7 (0.7) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 7 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-3C30NA MXZ-3C30NA2Indoor type Non-Duct (09+09+12)Duct (09+09+12)Capacity Cooling *1 Btu/h 28,400 27,400Heating 47 *1 Btu/h 28,600 27,600 Heating 17 *2 Btu/h 21,000 21,000 Power consumption Cooling *1 W 2,680 2,840 Heating 47 *1 W 2,150 2,220 Heating 17 *2 W 2,740 2,820 EER Cooling 10.6 9.6 SEER Cooling 19.0 16.2 HSPF IV(V) Heating 10.6 (8.0)9.6 (8.0) COP Heating 3.90 3.64 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 25 Min. circuit ampacity A 22.1 Fan motor F.L.A 2.43 Compressor Model SNB220FQGMC Winding resistance (at 68 ºF)Ω U-V 0.95 V-W 0.95 W-U 0.95 R.L.A 12 L.R.A 13.7 Refrigerant control LEV Sound level dB(A)52/56 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.31-11/32 Weight lb.NA: 135/NA2: 137 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A:1/2 B,C:3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.6lb. 13oz. Refrigeration oil (Model)ﬂ oz. (L)23.7 (0.7) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 8 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-4C36NA MXZ-4C36NA2Indoor type Non-Duct (09+09+09+09)Duct (09+09+09+09)Capacity Cooling *1 Btu/h 35,400 34,400Heating 47 *1 Btu/h 36,000 34,400 Heating 17 *2 Btu/h 26,600 26,600 Power consumption Cooling *1 W 3,760 3,940 Heating 47 *1 W 3,020 3,100 Heating 17 *2 W 3,440 3,540 EER Cooling 9.4 8.7 SEER Cooling 19.2 16.0 HSPF IV(V) Heating 11.0 (8.4)9.8 (8.4) COP Heating 3.50 3.25 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 25 Min. circuit ampacity A 22.1 Fan motor F.L.A 2.43 Compressor Model SNB220FQGMC Winding resistance (at 68 ºF)Ω U-V 0.95 V-W 0.95 W-U 0.95 R.L.A 12 L.R.A 13.7 Refrigerant control LEV Sound level dB(A)54/56 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.31-11/32 Weight lb.NA: 137/NA2: 139 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A:1/2 B,C,D:3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.6lb. 13oz. Refrigeration oil (Model)ﬂ oz. (L)23.7 (0.7) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 9 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-5C42NA MXZ-5C42NA2Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Capacity Cooling *1 Btu/h 40,500 37,500Heating 47 *1 Btu/h 45,000 41,000 Heating 17 *2 Btu/h 30,500 29,100 Power consumption Cooling *1 W 4,403 4,112 Heating 47 *1 W 3,575 3,463 Heating 17 *2 W 4,800 5,500 EER Cooling 9.2 9.0 SEER Cooling 19.7 15.2 HSPF IV(V) Heating 10.3 (7.7)9.1 (7.7) COP Heating 3.69 3.47 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 40 Min. circuit ampacity A NA: 31.9/NA2: 32.5 Fan motor F.L.A NA: 1.9 /NA2: 2.43 Compressor Model MNB33FBTMC-L Winding resistance (at 68 ºF)Ω U-V 0.30 V-W 0.30 W-U 0.30 R.L.A 20 L.R.A 28.8 Refrigerant control LEV Sound level dB(A)56/58 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.41-17/64 Weight lb.189 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A:1/2 B,C,D,E: 3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.8 lb. 13 oz. Refrigeration oil (Model)ﬂ oz. (L)37.2 (1.1) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 10 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-2C20NAHZ MXZ-2C20NAHZ2Indoor type Non-Duct (09+09)Duct (09+12)Capacity Cooling *1 Btu/h 18,000 20,000Heating 47 *1 Btu/h 22,000 22,000 Heating 17 *2 Btu/h 22,000 22,000 Power consumption Cooling *1 W 1,334 1,819 Heating 47 *1 W 1,612 1,748 Heating 17 *2 W 3,071 3,224 EER Cooling 13.5 11.0 SEER Cooling 17.0 15.0 HSPF IV(V) Heating 9.8 (7.8)9.5 (7.8) COP Heating 4.00 3.69 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 40 Min. circuit ampacity A NA: 28.9/NA2: 29.5 Fan motor F.L.A NA: 1.9/NA2: 2.43 Compressor Model MNB33FBTMC-L Winding resistance (at 68 ºF)Ω U-V 0.30 V-W 0.30 W-U 0.30 R.L.A 20 L.R.A 28.8 Refrigerant control LEV Sound level dB(A)54/58 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.41-17/64 Weight lb.187 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A,B: 3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.8 lb. 13 oz. Refrigeration oil (Model)ﬂ oz. (L)37.2 (1.1) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 11 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-3C24NAHZ MXZ-3C24NAHZ2Indoor type Non-Duct (06+06+09)Duct (09+09+09)Capacity Cooling *1 Btu/h 22,000 23,600Heating 47 *1 Btu/h 25,000 24,600 Heating 17 *2 Btu/h 25,000 24,600 Power consumption Cooling *1 W 1,630 2,360 Heating 47 *1 W 1,725 1,871 Heating 17 *2 W 3,557 3,795 EER Cooling 13.5 10.0 SEER Cooling 19.0 15.5 HSPF IV(V) Heating 10.0 (7.4)9.0 (7.4) COP Heating 4.25 3.80 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 40 Min. circuit ampacity A NA: 29.9/NA2: 30.5 Fan motor F.L.A NA: 1.9/NA2: 2.43 Compressor Model MNB33FBTMC-L Winding resistance (at 68 ºF)Ω U-V 0.30 V-W 0.30 W-U 0.30 R.L.A 20 L.R.A 28.8 Refrigerant control LEV Sound level dB(A)54/58 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.41-17/64 Weight lb.189 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A: 1/2 B,C: 3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.8 lb. 13 oz. Refrigeration oil (Model)ﬂ oz. (L)37.2 (1.1) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 12 NOTE: Test conditions are based on ARI 210/240. Item Outdoor model MXZ-3C30NAHZ MXZ-3C30NAHZ2Indoor type Non-Duct (09+09+12)Duct (09+09+12)Capacity Cooling *1 Btu/h 28,400 27,400Heating 47 *1 Btu/h 28,600 27,600 Heating 17 *2 Btu/h 28,600 27,600 Power consumption Cooling *1 W 2,272 2,661 Heating 47 *1 W 2,096 2,187 Heating 17 *2 W 4,192 4,258 EER Cooling 12.5 10.3 SEER Cooling 18.0 16.0 HSPF IV(V) Heating 11.0 (8.5)9.8 (7.7) COP Heating 4.00 3.70 External ﬁ nish Munsell 3.0Y 7.8/1.1 Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)A 40 Min. circuit ampacity A NA: 29.9/NA2: 30.5 Fan motor F.L.A NA: 1.9/NA2: 2.43 Compressor Model MNB33FBTMC-L Winding resistance (at 68 ºF)Ω U-V 0.30 V-W 0.30 W-U 0.30 R.L.A 20 L.R.A 28.8 Refrigerant control LEV Sound level dB(A)54/58 Defrost method Reverse cycle Dimensions W in.37-13/32 D in.13 H in.41-17/64 Weight lb.189 Remote controller Wireless type Control voltage (by built-in transformer)12-24 VDC Refrigerant piping Not supplied (optional parts) Valve size Liquid in.1/4 Gas in.A: 1/2 B,C: 3/8 Connection method Indoor Flared Outdoor Flared Refrigerant charge (R410A)lb.8 lb. 13 oz. Refrigeration oil (Model)ﬂ oz. (L)37.2 (1.1) (FV50S) Unit: °F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling *1: "A" Cooling steady state at rated compressor speed 80 67 95 (75) "B-2" Cooling steady state at rated compressor speed 80 67 82 (65) "B-1" Cooling steady state at minimum compressor speed 80 67 82 (65) Low ambient cooling steady state at minimum compressor speed 80 67 67 (53.5) Intermediate cooling steady state at intermediate compressor speed 80 67 87 (69) Heating *1: Standard rating-heating at rated compressor speed 70 60 47 43 *2: Low temperature heating at maximum compressor speed 70 60 17 15 Maximum temperature heating at minimum compressor speed 70 60 62 56.5 High temperature heating at minimum compressor speed 70 60 47 43 Frost accumulation at rated compressor speed 70 60 35 33 Frost accumulation at intermediate compressor speed 70 60 35 33 OBH702C 13 OUTDOOR UNIT MICROPHONE 39.4 in. Test conditions Cooling: Dry-bulb temperature 95°F Wet-bulb temperature 75°F Heating: Dry-bulb temperature 45°F Wet-bulb temperature 43°F CoolingHigh FUNCTIONFAN SPEED HeatingHigh 54 SPL(dB(A)) 56 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz MXZ-4C36NA MXZ-4C36NA2 MXZ-3C30NAMXZ-3C30NA2 CoolingHigh FUNCTIONFAN SPEED HeatingHigh 52 SPL(dB(A)) 56 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz CoolingHigh FUNCTIONFAN SPEED HeatingHigh 51 SPL(dB(A)) 55 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz MXZ-3C24NAMXZ-3C24NA2NOISE CRITERIA CURVES4 OBH702C 14 CoolingHigh FUNCTIONFAN SPEED HeatingHigh 54SPL(dB(A)) 58 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz MXZ-2C20NAHZMXZ-2C20NAHZ2 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz CoolingHigh FUNCTIONFAN SPEED HeatingHigh 54 SPL(dB(A)) 58 LINE MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz CoolingHigh FUNCTIONFAN SPEED HeatingHigh 54 SPL(dB(A)) 58 LINE CoolingHigh FUNCTIONFAN SPEED HeatingHigh 56SPL(dB(A)) 58 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BARBAND CENTER FREQUENCIES, Hz MXZ-5C42NAMXZ-5C42NA2 OBH702C 15 MXZ-3C24NA MXZ-3C24NA2MXZ-3C30NA MXZ-3C30NA2 Unit: inch (mm)OUTLINES AND DIMENSIONS5 Lock nut Conduit plates Conduit connector OBH702C 16 MXZ-4C36NA MXZ-4C36NA2 Unit: inch (mm) Lock nut Conduit plates Conduit connector OBH702C 17 MXZ-5C42NA MXZ-5C42NA2 Unit: inch (mm) Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702C 18 MXZ-2C20NAHZ MXZ-2C20NAHZ2 Unit: inch (mm) Lock nut Conduit connector Conduit plate OBH702C 19 MXZ-3C24NAHZ MXZ-3C24NAHZ2MXZ-3C30NAHZ MXZ-3C30NAHZ2 Unit: inch (mm) Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702C 20 MXZ-3C24NAMXZ-3C30NAWIRING DIAGRAM6 OBH702C 21 MXZ-3C24NA2MXZ-3C30NA2 OBH702C 22 MXZ-4C36NA OBH702C 23 MXZ-4C36NA2 OBH702C 24 MXZ-5C42NA NOTES: 1.À propos du câblage électrique de côté intérieur se référer à l'unité intérieure câblage schéma électrique pour l'entretien. 2.Utiliser des conducteurs en cuivre (pour le câblage). 3.Symbole ci-dessous indique. :bornier :connecteur MC U V W CNMC BLK WHT RED BLK RED REDRED WHT WHT WHT U W V OUTDOOR POWER P.C. BOARD t°t°t°t° CNTH2CNTH1 RT61 RT62 RT68 RT65 1 8 1 2 LED2 LED1 LED3 IC501 CN171 RT64 t° 1 2 CN741 15 MF 17 5 CNF1 CNDC BLKBRN13 13 CNDC IC401 TAB3 TAB4TAB5TAB6 IC411 L1 L2 D1 X65A CB3 CB4CB2CB1 X52CA X52CB PTC1 PTC2 PTC3 F1 F2 TAB2 TAB1 TB1 L1 L2 GR BLK BLU GRN/YLW BLK BLU CNAC1 1 3 CIRCUITBREAKER POWER SUPPLY208/230V1 phase 60Hz TB4 S2S3 S1 ORN BLU BLK 12-24V ~208/230V TO INDOOR UNIT No. C TB3 S2 S3 S1 WHT BLU BLK 12-24V ~208/230V TO INDOOR UNIT No. B TB2 S2 S3 S1 RED BLU BLK 12-24V ~208/230V TO INDOOR UNIT No. A CNAC2 BLKBLKCNAC 1 3 1 3 TBE4TBE2 TBE3 TBE1 BLKBLKBLKBLKCN151 CN152 BLKBLKBLKBLKBLKBLKBLKBLKBLK2117 1721 CN702 CN701 F711T801 IC801 OUTDOOR CONTROL P.C. BOARD (BLU) CN793 (WHT) CN791 1515 (RED) CN792 15 X712 X714 CN712 CN714 21 21 X713 CN713 21 21S4 21S2 LEV C LEV B LEV A 555 MM CN611 CN601 CN63H 21 1 5 1 3 ORN GRY YLW WHT RED BLU BLK HPS CN622 1 5 (YLW) CN794 15 (BLK) CN795 15 M LEV D 5 M LEV E 5 M MS 3~ MS3~ TB5 S2S3 S1 YLW BLU BLK 12-24V ~208/230V TO INDOOR UNIT No. D TB6 S2S3 S1 GRY BLU BLK 12-24V ~208/230V TO INDOOR UNIT No. E SYMBOL CB1~4 D1 F1, F2 F711 HPS IC401 IC411 IC501 IC801 PTC1~3 RT61 RT62 RT64 RT65 RT68 NAME SMOOTHING CAPACITOR DIODE FUSE (T6.3AL 250V) FUSE (T3.15AL 250V) HIGH PRESSURE SWITCH DIODE BRIDGE POWER MODULE POWER MODULE POWER DEVICE CIRCUIT PROTECTION DEFROST THERMISTOR DISCHARGE TEMP. THERMISTOR FIN TEMP. THERMISTOR AMBIENT TEMP. THERMISTOR OUTDOOR HEAT EXCHANGER TEMPERATURE THERMISTOR SYMBOL L1, L2 LED 1~3 LEV A~E MC MF T801 TB1~6 X52CA, B X65A X712 X713 X714 21S2 21S4 NAME REACTOR LED EXPANSION VALVE COMPRESSOR FAN MOTOR TRANSFORMER TERMINAL BLOCK RELAY RELAY RELAY RELAY RELAY 2WAY VALVE SOLENOID COIL REVERSING VALVE SOLENOID COIL 1.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. 2.Use copper conductors only (For field wiring). 3.Symbols below indicate. : Terminal block : connector NOTES: OBH702C 25 MXZ-5C42NA2 OBH702C 26 MXZ-2C20NAHZ OBH702C 27 MXZ-2C20NAHZ2 OBH702C 28 MXZ-3C24NAHZMXZ-3C30NAHZ OBH702C 29 MXZ-3C24NAHZ2MXZ-3C30NAHZ2 OBH702C 30 Unit: inch (mm)MXZ-3C24NA MXZ-3C24NA2MXZ-3C30NA MXZ-3C30NA2REFRIGERANT SYSTEM DIAGRAM7R.V.coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Outdoor heat exchanger Compressor Muffler 4-way valve High pressure switch ĭ1/4 ĭ3/8 Indoor unit B ĭ1/2Indoor unit A Accumulator Indoor unit C ĭ1/4 LEVA Distributor Stop valve (with service port) Capillary tube Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100)Strainer #100 Union Union Header(Gas) Stop valve Strainer #100 Header (Evaporator) Service port ĭ1/4 ĭ3/8 Submuffler Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Compressor shell temperature thermistor RT62 Defrost temperature thermistor RT61 Indoor unit B Indoor unit A Indoor unit C Service port Strainer #100 Strainer #100 LEVB LEVC Strainer #50 OBH702C 31 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe. For further information on Different-diameter pipe, refer to "PARTS CATALOG". Unit: inch Piping length each indoor unit (a, b, c) 82 ft. MAX. Total piping length (a+b+c) 230 ft. MAX. Bending point for each unit 25 MAX. Total bending point 70 MAX. It is irrelevant which unit is higher. MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 Operating Range MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 a b Outdoor unit Indoor units Max. height difference 49 ft. 49 ft. c 49 ft. Outdoor unit union diameter For Indoor unit A Liquid 1/4 Gas 1/2 Indoor unit B Liquid 1/4 Gas 3/8 Indoor unit C Liquid 1/4 Gas 3/8 Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Heating Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB OBH702C 32 MXZ-4C36NA MXZ-4C36NA2R.V.coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Muffler High pressure switch ĭ1/4 ĭ1/4 ĭ3/8 ĭ1/2 Accumulator ĭ1/4 LEV A ĭ3/8 Strainer #100 Strainer #100 Strainer #100 Strainer#100 Union Union Header(Gas) Stop valve Header (Evaporator) ĭ1/4 ĭ3/8 Sub muffler Compressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Indoor unit A Indoor unit D Indoor unit C Indoor unit B 4-way valve Service port Service port Stop valve (with service port) Indoor unit A Indoor unit D Indoor unit C Indoor unit B LEV B LEV C LEV D Outdoor heat exchanger Capillary tube Distributor Strainer #100 Strainer #50 Unit: inch (mm) OBH702C 33 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe. For further information on Different-diameter pipe, refer to "PARTS CATALOG". Unit: inch Piping length each indoor unit (a, b, c, d) 82 ft. MAX. Total piping length (a+b+c+d) 230 ft. MAX. Bending point for each unit 25 MAX. Total bending point 70 MAX. It is irrelevant which unit is higher. MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4C36NA MXZ-4C36NA2 Operating Range MXZ-4C36NA MXZ-4C36NA2 a b c d Outdoor unit Indoor units 49 ft. 49 ft. 49 ft. Max. height difference Outdoor unit union diameter For Indoor unit A Liquid 1/4 Gas 1/2 Indoor unit B Liquid 1/4 Gas 3/8 Indoor unit C Liquid 1/4 Gas 3/8 Indoor unit D Liquid 1/4 Gas 3/8 Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Heating Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB OBH702C 34 MXZ-5C42NA MXZ-5C42NA2 R.V.coilOFF Refrigerant flow in heatingONRefrigerant flow in cooling Compressor Oil separator High pressure switch Ø1/4 Ø1/4 Ø3/8 Ø1/2Indoor unit A Accumulator Ø1/4 LEV A Ø3/8 2-way solenoid valve Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer Strainer #50Strainer #50 #100 Header(Evaporator) Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Ø1/4 Ø1/4 Ø3/8 Ø3/8 Compressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Outdoor heat exchanger 4-way valve Stop valve (with service port) Service port Service port Indoor unit B Indoor unit C Indoor unit D Indoor unit E Indoor unit A Indoor unit B Indoor unit C Indoor unit D Indoor unit E Strainer #100 Strainer #100 Strainer #100 Strainer #100 LEV B LEV E LEV D LEV C R.V.coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø1/4 Ø1/4 Ø3/8 Ø1/2Indoor unit A Accumulator Ø1/4 LEV A Ø3/8 2-way solenoid valve Sub muffler Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer Strainer #50Strainer #50 #100 Header(Evaporator) Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Ø1/4 Ø1/4 Ø3/8 Ø3/8 Compressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Outdoor heat exchanger 4-wayvalve Stop valve (with service port) Service port Service port Indoor unit B Indoor unit C Indoor unit D Indoor unit E Indoor unit A Indoor unit B Indoor unit C Indoor unit D Indoor unit E Strainer #100 Strainer #100 Strainer #100 Strainer #100 LEV B LEV E LEV D LEV C Unit: inch (mm) OBH702C 35 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe. For further information on Different-diameter pipe, refer to "PARTS CATALOG". Outdoor unit union diameter For Indoor unit A Liquid 1/4 Gas 1/2 Indoor unit B Liquid 1/4 Gas 3/8 Indoor unit C Liquid 1/4 Gas 3/8 Indoor unit D Liquid 1/4 Gas 3/8 Indoor unit E Liquid 1/4 Gas 3/8 Operating Range MXZ-5C42NA MXZ-5C42NA2 Piping length each indoor unit (a, b, c, d, e) 82 ft. MAX. Total piping length (a+b+c+d+e) 262 ft. MAX. Bending point for each unit 25 MAX. Total bending point 80 MAX. It is irrelevant which unit is higher. MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-5C42NA MXZ-5C42NA2 Unit: inch a b e c d Outdoor unit Indoor units 49 ft. 49 ft. 49 ft. Max. height difference Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Heating Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB OBH702C 36 MXZ-2C20NAHZ MXZ-2C20NAHZ2 R.V.coilOFF Refrigerant flow in heatingONRefrigerant flow in cooling Compressor Oil separator High pressure switch Ø3/8 Ø3/8 Accumulator Ø1/4 LEV A 2-way solenoid valve Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer #100 Header(Evaporator) Ø1/4 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Compressor shell temperature thermistor RT62 Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) 4-way valve Stop valve (with service port) Service port Service port Outdoor heat exchanger Indoor unit A Indoor unit B Indoor unit A Indoor unit B Strainer #100 LEV B Strainer #50 Strainer #50 R.V.coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø Sub muffler 4-wayvalve 3/8 Ø3/8 Accumulator Ø1/4 LEV A 2-way solenoid valve Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer #100 Header(Evaporator) Ø1/4 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Compressor shell temperature thermistor RT62 Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Stop valve (with service port) Service port Service port Outdoor heat exchanger Indoor unit A Indoor unit B Indoor unit A Indoor unit B Strainer #100 LEV B Strainer #50 Strainer #50 Unit: inch (mm) OBH702C 37 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe. For further information on Different-diameter pipe, refer to "PARTS CATALOG". Unit: inch MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-2C20NAHZ MXZ-2C20NAHZ2 Operating Range MXZ-2C20NAHZ MXZ-2C20NAHZ2 Outdoor unit union diameter For Indoor unit A Liquid 1/4 Gas 3/8 Indoor unit B Liquid 1/4 Gas 3/8 Piping length each indoor unit (a, b)82 ft. MAX. Total piping length (a+b)164 ft. MAX. Bending point for each unit 25 MAX. Total bending point 50 MAX. It is irrelevant which unit is higher. a b Outdoor unit Indoor units 49 ft. 49 ft. 49 ft. Max. height difference Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Heating Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB OBH702C 38 MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 R. V. coilOFF Refrigerant flow in heatingON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø1/4 Ø1/2 Accumulator Ø1/4 LEV A Ø3/8 2-way solenoid valve Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer #100 Header(Evaporator) Ø1/4 Ø3/8 Compressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Indoor unit B Indoor unit C Indoor unit A 4-way valve Stop valve (with service port) Service port Service port Outdoor heat exchanger Indoor unit B Indoor unit C Indoor unit A Strainer #100 Strainer #100 LEV B LEV C Strainer #50Strainer #50 R. V. coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø1/4 Ø1/2 Accumulator Ø1/4 LEV A Ø3/8 2-way solenoid valve Distributor Strainer #100 Union Union Header(Gas) Stop valve Strainer #100 Header(Evaporator) Ø1/4 Ø3/8 Compressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Capillary tube Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Indoor unit B Indoor unit C Indoor unit A 4-wayvalve Stop valve (with service port) Service port Service port Outdoor heat exchanger Indoor unit B Indoor unit C Indoor unit A Strainer #100 Strainer #100 LEV B LEV C Strainer #50Strainer #50 Sub muffler Unit: inch (mm) OBH702C 39 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe. For further information on Different-diameter pipe, refer to "PARTS CATALOG". Unit: inch Piping length each indoor unit (a, b, c)82 ft. MAX. Total piping length (a+b+c)230 ft. MAX. Bending point for each unit 25 MAX. Total bending point 70 MAX. It is irrelevant which unit is higher. MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Operating Range MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 a b Outdoor unit Indoor units Max. height difference 49 ft. 49 ft. c 49 ft. Outdoor unit union diameter For Indoor unit A Liquid 1/4 Gas 1/2 Indoor unit B Liquid 1/4 Gas 3/8 Indoor unit C Liquid 1/4 Gas 3/8 Indoor intake air temperature Outdoor intake air temperature Cooling Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Heating Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB OBH702C 40 When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refriger-ant is released into the atmosphere. 1) Turn off the breaker. 2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3) Fully close the stop valve on the liquid pipe side of the outdoor unit. 4) Turn on the breaker. 5) Start the emergency COOL operation on all the indoor units. 6) When the pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping the operation.) * If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), or the protection function may operate due to the pressure increase in the high-pressure refrigerant cir- cuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the system with the correct amount of refrigerant after the indoor and outdoor units have been relocated. 7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping. When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes. WARNING PUMPING DOWN OBH702C 41 DATA8 Model MXZ-3C24NA MXZ-3C24NA2Indoor type Non-Duct (06+06+09)Duct (09+09+09)Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 22,000 25,000 23,600 24,600 SHF ––––– Input kW 1.62 1.75 2.10 1.90 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 1.554 1.684 1.920 1.780 Comp. current (208/230V)A 7.47 / 6.76 8.1 / 7.32 9.23 / 8.35 8.56 / 7.74 Fan motor current A 0.3 0.3 0.3 0.3 Refrigerant circuit Condensing pressure PSIG 395 310 419 345 Suction pressure PSIG 162 101 138 102 Discharge temperature ºF 143 137 155 141 Condensing temperature ºF 116 98 120 106 Suction temperature ºF 59 36 50 34 Comp. shell bottom temp.ºF 137 128 146 131 Ref. pipe length [Total pipe length for multi-system]ft 25[75] Refrigerant charge (R410A) –6lb. 13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF -43 -43 Fan speed rpm 720 750 720 750 Airﬂ ow CFM 2,287 2,382 2,287 2,382 Model MXZ-3C30NA MXZ-3C30NA2 Indoor type Non-Duct (09+09+12)Duct (09+09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 28,400 28,600 27,400 27,600 SHF ––––– Input kW 2.68 2.15 2.84 2.22 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 2.614 2.084 2.650 2.090 Comp. current (208/230V)A 12.57 / 11.37 10.02 / 9.06 12.74 / 11.52 10.05 / 9.09 Fan motor current A 0.3 0.3 0.3 0.3 Refrigerant circuit Condensing pressure PSIG 432 323 439 323 Suction pressure PSIG 137 97 132 99 Discharge temperature ºF 159 136 165 136 Condensing temperature ºF 122 101 124 101 Suction temperature ºF 49 32 47 32 Comp. shell bottom temp.ºF 145 121 156 128 Ref. pipe length [Total pipe length for multi-system]ft 25[75] Refrigerant charge (R410A) –6 lb.13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF -43 -43 Fan speed rpm 720 750 720 750 Airﬂ ow CFM 2,287 2,382 2,287 2,382 OBH702C 42 Model MXZ-4C36NA MXZ-4C36NA2Indoor type Non-Duct (09+09+09+09)Duct (09+09+09+09)Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 35,400 36,000 34,400 34,400 SHF ––––– Input kW 3.76 3.02 3.94 3.10 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 3.672 2.932 3.700 2.940 Comp. current (208/230V)A 17.65 / 15.97 14.1 / 12.75 17.79 / 16.09 14.13 / 12.78 Fan motor current A 0.3 0.3 0.3 0.3 Refrigerant circuit Condensing pressure PSIG 461 297 470 334 Suction pressure PSIG 141 89 129 91 Discharge temperature ºF 172 138 176 147 Condensing temperature ºF 127 95 129 103 Suction temperature ºF 51 28 46 29 Comp. shell bottom temp.ºF 162 130 165 139 Ref. pipe length [Total pipe length for multi-system]ft 25[100] Refrigerant charge (R410A) –6 lb.13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF -43 -43 Fan speed rpm 720 750 720 750 Airﬂ ow CFM 2,287 2,382 2,287 2,382 OBH702C 43 Model MXZ-2C20NAHZ MXZ-2C20NAHZ2 Indoor type Non-Duct (09+09)Duct (09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 18,000 22,000 20,000 22,000 SHF ----- Input kW 1.34 1.62 1.82 1.75 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 1.296 1.574 1.670 1.660 Comp. current (208/230V)A 6.23/5.63 7.57/6.84 8.03/7.26 7.98/7.22 Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 Refrigerant circuit Condensing pressure PSIG 406 341 406 334 Suction pressure PSIG 154 110 133 113 Discharge temperature ºF 158 131 148 141 Condensing temperature ºF 108 105 112 103 Suction temperature ºF 60 37 46 37 Comp. shell bottom temp.ºF 137 107 127 117 Ref. pipe length [Total pipe length for multi-system]ft 25 [50] Refrigerant charge (R410A)-8 lb. 13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF -43 -43 Fan speed rpm 630 730 630 730 Airﬂ ow CFM 2,118 2,542 2,118 2,542 Model MXZ-5C42NA MXZ-5C42NA2Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09)Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 40,500 45,000 37,500 41,000 SHF ----- Input kW 4.41 3.58 4.17 3.47 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 4.300 3.465 3.870 3.270 Comp. current (208/230V)A 20.67/18.7 16.66/15.07 18.61/16.83 15.72/14.22 Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 Refrigerant circuit Condensing pressure PSIG 466 305 446 326 Suction pressure PSIG 153 93 137 98 Discharge temperature ºF 172 155 165 143 Condensing temperature ºF 127 97 124 102 Suction temperature ºF 53 27 47 29 Comp. shell bottom temp.ºF 156 138 145 121 Ref. pipe length [Total pipe length for multi-system]ft 25 [80] Refrigerant charge (R410A)-8 lb. 13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF -43 -43 Fan speed rpm 630 730 630 730 Airﬂ ow CFM 2,118 2,542 2,118 2,542 OBH702C 44 Model MXZ-3C24NAHZ MXZ-3C24NAHZ2Indoor type Non-Duct (06+06+09)Duct (09+09+09)Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 22,000 25,000 23,600 24,600 SHF ----- Input kW 1.63 1.73 2.36 1.88 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 1.564 1.661 2.180 1.760 Comp. current (208/230V)A 7.52/6.8 7.99/7.22 10.48/9.48 8.46/7.65 Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 Refrigerant circuit Condensing pressure PSIG 397 302 377 329 Suction pressure PSIG 164 106 136 109 Discharge temperature ºF 144 122 152 127 Condensing temperature ºF 114 97 115 103 Suction temperature ºF 59 42 48 36 Comp. shell bottom temp. ºF 128 105 136 109 Ref. pipe length [Total pipe length for multi-system]ft 25 [70] Refrigerant charge (R410A) - 8 lb. 13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF - 43 - 43 Fan speed rpm 630 730 630 730 Airﬂ ow CFM 2,118 2,542 2,118 2,542 Model MXZ-3C30NAHZ MXZ-3C30NAHZ2 Indoor type Non-Duct (09+09+12)Duct (09+09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 28,400 28,600 27,400 27,600 SHF ----- Input kW 2.28 2.10 2.67 2.19 Electrical circuit Power supply (V, phase, Hz)208/230, 1, 60 Input kW 2.214 2.031 2.480 2.060 Comp. current (208/230V)A 10.64/9.63 9.76/8.83 11.92/10.78 9.9/8.96 Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 Refrigerant circuit Condensing pressure PSIG 404 321 416 329 Suction pressure PSIG 146 103 131 107 Discharge temperature ºF 146 131 153 128 Condensing temperature ºF 117 101 118 103 Suction temperature ºF 52 35 45 35 Comp. shell bottom temp. ºF 129 111 135 108 Ref. pipe length [Total pipe length for multi-system]ft 25 [70] Refrigerant charge (R410A) - 8 lb. 13 oz. Outdoor unit Intake air temperature DB ºF 95 47 95 47 WB ºF - 43 - 43 Fan speed rpm 650 730 650 730 Airﬂ ow CFM 2,224 2,542 2,224 2,542 OBH702C 45 (2) OPERATION 8-1. OPERATING RANGE(1) POWER SUPPLY Function Cooling Heating "A" Cooling steady state at rated compressor speed "B-2" Cooling steady state at rated compressor speed "B-1" Cooling steady state at minimum compressor speed Low ambient cooling steady state at minimum compressor speed Intermediate cooling steady state at intermediate compressor speed Standard rating-heating at rated compressor speed Low temperature heating at rated compressor speed Max. temperature heating at minimum compressor speed High temperature heating at minimum compressor speed Frost accumulation at rated compressor speed Frost accumulation at intermediate compressor speed DB (°F) 80 80 80 80 80 70 70 70 70 70 70 WB (°F) 67 67 67 67 67 60 60 60 60 60 60 Indoor DB (°F) 95 82 82 67 87 47 17 62 47 35 35 WB (°F) (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Outdoor Condition Intake air temperature Model Rating Guaranteed Voltage Outdoor unit MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 208/230 V 60 Hz 1ø OBH702C 46 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NAMXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. (1) GUARANTEED VOLTAGE 198 ~ 253 V 60 Hz (2) AIR FLOW Air flow should be set at MAX. (3) MAIN READINGS (1) Indoor intake air wet-bulb temperature : °FWB (2) Indoor outlet air wet-bulb temperature : °FWB (3) Outdoor intake air dry-bulb temperature : °FDB (4) Total input: W (5) Indoor intake air dry-bulb temperature : °FDB (6) Outdoor intake air wet-bulb temperature : °FWB (7) Total input : W Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service. } } Cooling Heating How to measure the indoor air wet and dry bulb temperature difference 1. Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high. 2. Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun. 3. Check that the air filter is cleaned. 4. Open windows and doors of room. 5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE. 6. Compressor starts running at 33 Hz (COOL) or 45 Hz (HEAT). The frequency at each operation mode is fixed. 7. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature. 8. 10 minutes later, measure temperature again and check that the temperature does not change. INDOOR UNIT OUTDOOR UNIT Wet and dry bulb thermometers Wet and dry bulb thermometers OBH702C 47 NOTE: The above broken lines are for the heating operation without any frost and defrost operation. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NAMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 06 class(19Hz)24 class(54Hz)18 class(42Hz)15 class(35Hz)12 class(31Hz)Indoor unit class(Inverter output frequency)Indoor air Wet-bulb temperaturedifference (degree)09 class(24Hz)11.3 10.5 9.6 8.8 8.0 7.2 6.5 7.9 7.3 6.8 6.2 5.7 5.1 4.6 13.8 12.7 11.7 10.7 9.7 8.7 7.8 13.5 12.4 11.4 10.5 9.5 8.5 7.6 15.6 14.4 13.2 12.1 10.9 9.8 8.7 17.1 15.8 14.5 13.2 12.0 10.7 9.5 *Cooling capacity (at Rated frequency) 0.9 1.0 1.1 1.2 1.3 1.4 1.5 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry-bulb temperature(°F)Capacity correction factors79 75 68 64 72 Indoor intake air Wet-bulb temperature(°F) 0.8 0.9 1.0 1.1 1.2 1.3 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry-bulb temperature (°F) 79 75 72 68 64 Input correction factorsIndoor intake air Wet-bulb temperature( F) Total input (Cooling : at Rated frequency)09 class(29Hz)12 class(36Hz)15 class(43Hz)Indoor unit class(Inverter output frequency)Indoor air Dry-bulb temperaturedifference (degree)39.8 36.7 33.7 30.2 27.2 24.1 21.4 18.0 15.1 11.9 53.3 49.1 45.2 40.5 36.5 32.4 29.0 24.1 20.5 16.0 34.0 31.3 28.8 25.7 23.2 20.7 18.0 15.3 13.0 10.3 24.3 22.5 20.5 18.5 16.6 14.8 13.0 11.0 9.2 7.4 44.8 41.4 38.0 34.0 30.6 27.2 24.1 20.2 17.1 13.5 49.1 45.4 41.6 37.4 33.7 29.9 26.5 22.1 18.7 14.8 06 class(23Hz) 24 class(62Hz)*18 class(50Hz)Outdoor intake air Wet-bulb temperature (°F) 5 142332415059 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 Heating capacity (at Rated frequency)Capacity correction factor5968 779 Outdoor intake air Wet-bulb temperature (°F) 5 142332415059 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 Total input (Heating : at Rated frequency)Input correction factor5968 79Indoor i nt a k e air Dr y- b ul b t e m p er at ur e (° F) Indoor i n t a k e a i r D r y - b u l b t e m p e r a t u r e ( ° F ) 8-2. CAPACITY AND THE INPUT CURVES * MXZ-3C30/4C36NA MXZ-3C30/4C36NA2 OBH702C 48 NOTE: The above broken lines are for the heating operation without any frost and defrost operation. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 06 class(18Hz)24 class(42Hz)18 class(32Hz)15 class(26Hz)12 class(24Hz)Indoor unit class(Inverter output frequency)Indoor air Wet-bulb temperaturedifference (degree)09 class(20Hz)11.3 10.5 9.6 8.8 8.0 7.2 6.5 7.9 7.3 6.8 6.2 5.7 5.1 4.6 13.8 12.7 11.7 10.7 9.7 8.7 7.8 13.5 12.4 11.4 10.5 9.5 8.5 7.6 15.6 14.4 13.2 12.1 10.9 9.8 8.7 17.1 15.8 14.5 13.2 12.0 10.7 9.5 *1*2Cooling capacity (at Rated frequency) 0.9 1.0 1.1 1.2 1.3 1.4 1.5 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry-bulb temperature(°F)Capacity correction factors79 75 68 64 72 Indoor intake air Wet-bulb temperature(°F) 0.8 0.9 1.0 1.1 1.2 1.3 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry-bulb temperature (°F) 79 75 72 68 64 Input correction factorsIndoor intake air Wet-bulb temperature( F) Total input (Cooling : at Rated frequency)09 class(20Hz)12 class(28Hz)15 class(33Hz)Indoor unit class(Inverter output frequency)Indoor air Dry-bulb temperaturedifference (degree)39.8 36.7 33.7 30.2 27.2 24.1 21.4 18.0 15.1 11.9 53.3 49.1 45.2 40.5 36.5 32.4 29.0 24.1 20.5 16.0 34.0 31.3 28.8 25.7 23.2 20.7 18.0 15.3 13.0 10.3 24.3 22.5 20.5 18.5 16.6 14.8 13.0 11.0 9.2 7.4 44.8 41.4 38.0 34.0 30.6 27.2 24.1 20.2 17.1 13.5 49.1 45.4 41.6 37.4 33.7 29.9 26.5 22.1 18.7 14.8 06 class(18Hz) 24 class(44Hz)18 class(37Hz)*1*2*1 *2 MXZ-5C42NA, MXZ-3C24/30NAHZ MXZ-5C42NA2, MXZ-3C24/30NAHZ2 MXZ-5C42NA,MXZ-3C30NAHZ MXZ-5C42NA2, MXZ-3C30NAHZ2 Outdoor intake air Wet-bulb temperature (°F) 5 142332415059 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 Heating capacity (at Rated frequency)Capacity correction factor5968 779 Outdoor intake air Wet-bulb temperature (°F) 5 142332415059 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 Total input (Heating : at Rated frequency)Input correction factor5968 79Indoor i nt a k e air Dr y- b ul b t e m p er at ur e (° F) Indoor i n t a k e a i r D r y - b u l b t e m p e r a t u r e ( ° F ) OBH702C 49 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 2.5 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 050100150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 2. 09-class unit in single operation 1. 06-class unit in single operation 3. 12-class unit in single operation 4. 15-class unit in single operation 5. 18-class unit in single operation 6. 24-class unit in single operation (MXZ-3C30/4C36NA, MXZ-3C30/4C36NA2 only) OBH702C 50 (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 050100150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz <HEAT>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Total input Frequency Hz <COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 <HEAT>Capacity <HEAT>Total input Frequency Hz Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0<COOL>Capacity Frequency Hz0 50 100 150 0.5 1.0 1.5 2.0 0 50 100 150 0.5 1.0 1.5 2.0 <COOL>Total input Frequency Hz 2. 09-class unit in single operation 1. 06-class unit in single operation 3. 12-class unit in single operation 4. 15-class unit in single operation 5. 18-class unit in single operation (MXZ-5C42NA, MXZ-5C42NA2, MXZ-3C24/30NAHZ, MXZ-3C24/30NAHZ2 only) 6. 24-class unit in single operation (MXZ-5C42NA, MXZ-5C42NA2, MXZ-3C30NAHZ, MXZ-3C30NAHZ2 only) OBH702C 51 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$32 Hz 36,* 24 Hz 24 Hz 65 75 70 86 8075 70,QGRRU' U \ E X O E W H P S H U D W X U H Û ) ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ) 65 70 75 80 85 90 95 100 105 110 115 110 120 130 140 150 160 $PELHQWWHPSHUDWXUHÛ) Û) 86 80 75 70 ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operation8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 32 Hz. OBH702C 52 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$32 Hz 36,* 24 Hz 24 Hz 65 75 70 86 8075 70,QGRRU' U \ E X O E W H P S H U D W X U H Û ) ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ) 65 70 75 80 85 90 95 100 105 110 115 110 120 130 140 150 160 $PELHQWWHPSHUDWXUHÛ) Û) 86 80 75 70 ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operationData is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 32 Hz. <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. OBH702C 53 65 70 75 80 85 90 95 100 105 110 115 110 120 130 140 150 160 Ambient temperature (˚F) (˚F) 86 80 75 70 86807570 15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 Ambient temperature (˚F) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Ambient temperature (˚F) (˚F) (˚F) (PSIG)Outdoor low pressureOutdoor unit current (A)Outdoor unit current (A)32 Hz 24 Hz 24 Hz 65 70 75 Indoor Dry - b u l b t e m p e r a t u r e ( ˚F)Indoor D r y - b ul b t e m p e r at u r e ( ˚F)Indoor Dr y- b ul b t e m p er at ur e (˚F) 3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operation Air flow speed: High Inverter output frequency: 24 Hz (2) HEAT operation Data is based on the condition of indoor humidity 50% Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 32 Hz. <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. OBH702C 54 4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operation 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 160 170 Ambient temperature (˚F) (˚F) 86 80 75 70 86 80 7570 15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 Ambient temperature (˚F) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Ambient temperature (˚F) (˚F) (˚F) (PSIG)Outdoor low pressureOutdoor unit current (A)Outdoor unit current (A)32 Hz 24 Hz 24 Hz 65 70 75 Indoor Dr y - b u l b t e m p e r a t u r e ( ˚F) Indoor D r y - b ul b t e m p e r a t u r e ( ˚F)Indoor Dr y- b ul b t e m p er at ur e (˚F) (2) HEAT operation Data is based on the condition of outdoor humidity 75% Set air flow to High speed. Inverter output frequency is 32 Hz. Air flow speed: High Inverter output frequency: 24 Hz Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. OBH702C 55 5. 18-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operation (2) HEAT operation 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 160 170 Ambient temperature (˚F) (˚F) 86 80 75 70 86 80 7570 15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 Ambient temperature (˚F) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Ambient temperature (˚F) (˚F) (˚F) (PSIG)Outdoor low pressureOutdoor unit current (A)Outdoor unit current (A)32 Hz 24 Hz 24 Hz 65 70 75 Indoor Dr y - b u l b t e m p e r a t u r e ( ˚F) Indoor D r y - b ul b t e m p e r at u r e ( ˚F)Indoor Dr y- b ul b t e m p er at ur e (˚F) Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 32 Hz. Air flow speed: High Inverter output frequency: 24 Hz Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. OBH702C 56 6. 24-class unit in single operation (OUTDOOR UNIT: MXZ-3C30NA MXZ-4C36NA MXZ-3C30NA2 MXZ-4C36NA2)(1) COOL operation 65 70 75 80 85 90 95 100 105 110 115 130 140 150 160 170 180 Ambient temperature (˚F) (˚F) 15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 Ambient temperature (˚F) 65 70 75 80 85 90 95 100 105 110 115 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Ambient temperature (˚F) (˚F) (˚F) (PSIG)Outdoor low pressureOutdoor unit current (A)Outdoor unit current (A)32 Hz 24 Hz 24 Hz 86 80 75 70 75 70 65 Indoor Dry-b u l b t e m p e r a t u r e ( ˚F)Indoor D r y - b ul b t e m p e r at u r e ( ˚F) Indoor D r y - b ul b t e m p e r at u r e ( ˚F) 86 80 75 70 (2) HEAT operation Data is based on the condition of outdoor humidity 75% Set air flow to High speed. Inverter output frequency is 32 Hz. Air flow speed: High Inverter output frequency: 24 Hz Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. OBH702C 57 7. 06-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2)(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 160 170 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 7570 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 58 8. 09-class unit in single operation(OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2)(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 160 170 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 7570 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 59 9. 12-class unit in single operation(OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2)(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 160 170 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 7570 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 60 10. 15-class unit in single operation(OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2)(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 170 180 160 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 75 70 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 61 11. 18-class unit in single operation(OUTDOOR UNIT: MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2)(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 120 130 140 150 170 180 160 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 75 70 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 62 12. 24-class unit in single operation(OUTDOOR UNIT: MXZ-5C42NA MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C30NAHZ2)(1) COOL operation(1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 18 Hz (2) HEAT operation <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 65 70 75 80 85 90 95 100 105 110 115 130 140 150 170 190 200 160 180 $PELHQWWHPSHUDWXUHÛ) Û) ,QGRRU ' U \ E X O E W H P S H U D W X U H Û ) 65 70 75 80 85 90 95 100 105 110 115 0.0 1.0 2.0 3.0 4.0 5.0 6.0 $PELHQWWHPSHUDWXUHÛ) Û) Û)15 20 25 30 35 40 45 50 55 60 65 70 75 2.0 3.0 4.0 5.0 6.0 7.0 $PELHQWWHPSHUDWXUHÛ)Outdoor low pressure2XWGRRUXQLWFXUUHQW$2XWGRRUXQLWFXUUHQW$20 Hz 36,* 18 Hz 18 Hz ,QGRRU 'U \ E XO EW H P S HU DW XU HÛ ),QGRRU ' U \ E XO EW H P S H U DW X U H Û ) 86 8075 70 86 80 75 70 65 7570 Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. OBH702C 63 ACTUATOR CONTROL9MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NAMXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Relation between main sensor and actuator Sensor Purpose Actuator Compressor LEV Outdoor fan motor 4-way valve 2-way solenoid valve Defrost heater (MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) Discharge temperature thermistor Protection ○○○ Indoor coil temperature thermistor Cooling: Coil frost prevention ○○ Heating: High pres- sure protection ○○ Defrost thermistor Heating: Defrosting ○○○○ Fin temperature thermistor Protection ○○ Ambient temperature thermistor Control/Protection ○○○ ○ Heating: Defrosting (Heater)○ Outdoor heat exchanger temperature thermistor Cooling: Control/ Protection ○○○ ○ Capacity code Control ○○ OBH702C 64 10-1. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the start-up of the compressor. To improve start-up condition, the compressor is energized even while it is not operating. This is to generate heat at the winding. The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is ON at initial setting. [How to deactivate pre-heat control] Turn OFF the power supply for the air conditioner before making the setting. Set the "4" of SW2 on the outdoor control P.C. board to ON to deactivate pre-heat control function. Turn ON the power supply for the air conditioner. NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF. SERVICE FUNCTIONS10MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NAMXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Outdoor control P.C. board SW871 LED OBH702C 65 10-2. AUTO LINE CORRECTING Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping.Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 20 minutes. [How to activate this function] &KHFNWKDWRXWVLGHWHPSHUDWXUHLVDERYHÛ) 7KLVIXQFWLRQGRHVQRWZRUNZKHQRXWVLGHWHPSHUDWXUHLVQRWDERYHÛ) 2. Check that the stop valves of the liquid pipe and gas pipe are open. 3. Check that the wiring between indoor and outdoor unit is correct. (If the wiring is not correct, this function does not work.) 4. Turn ON the power supply and wait at least 1 minute. 5. Press the piping/wiring correction switch (SW871) on the outdoor control P.C. board. Do not touch energized parts. 6. Press the switch to cancel. NOTE : Indoor unit cannot be operated while this function is activated. When this function is activated while indoor unit is operating, the operation will be stopped. Operate indoor unit after the auto line correcting is finished. Pressing the switch during detection cancels this function. Make sure that the valves are open and the pipes are not collapsed or clogged. LED indication after cancel : LED1 (Red) Lighted LED indication during detection: LED indication after detection: LED2 (Yellow) Lighted LED3 (Green) Once LED1 (Red) Lighted LED2 (Yellow) Lighted LED3 (Green) Not lighted LED1 (Red) Lighted Once LED2 (Yellow) Not lighted Once Other indications LED3 (Green) Lighted Once Completed (Problem corrected/ nomal) Not completed (Detection failed) 5HIHUWR6$)(7<35(&$87,216:+(1/('%/,1.6 located behind the service panel. Indication Press the switch for more than 5 seconds. LED will show the record of auto correcting for about 30 seconds as shown in the table below: NOTE : Activate this function to confirm the correct wiring after replacing the outdoor control P.C. board. (Previous records are deleted when the outdoor control P.C. board is replaced.) The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function"). LED1 (Red) Once 3 times LED2 (Yellow) Once 3 times LED3 (Green) Lighted Lighted Not corrected Corrected Number of blinks Wiring line The record of auto line correcting can be confirmed in the following way: OBH702C 66 11 3. Troubleshooting procedure 1) Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the OPERATIONAL INDICATOR lamp is flashing on and off before starting service work. 2) When the outdoor control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 3) When troubleshooting, refer to 11-2, 11-3 and 11-4. Lead wiring Connector housing <Incorrect><Correct> 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing. 1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the outdoor control P.C. board. 3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires. TROUBLESHOOTING 11-2. FAILURE MODE RECALL FUNCTION This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (11-4) disappears, the memorized failure details can be recalled. 1. Flow chart of failure mode recall function for the indoor/outdoor unit Refer to the service manual of indoor unit. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NAMXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702C 67 2. Flow chart of the detailed outdoor unit failure mode recall function 2.Blinking pattern when outdoor unit is abnormal: ON OFF No beep Beeps Repeated cycle 2.5-second OFF 3-second ON Blinking at 0.5- second interval No beep Beeps Repeated cycle 2.5-second OFF 3-second ON Blinking at 0.5- second interval Repeated cycle Does the OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The outdoor unit is abnormal. Beep is emit- ted at the same timing as the blinking of the OPERATION INDICATOR lamp. 2 Yes (Blinks) No (OFF) The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Operational procedure Make sure that the remote controller is set to the failure mode recall function. 3 With the remote controller headed towards the indoor unit, press the TEM- PERATURE buttons to adjust the set temperature to 77°F (25°C). 1 1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure mode table (11-2.3.). Make sure to check at least 2 consecutive blinking cycles. 2 Repair the failure parts. The outdoor unit is normal. Release the failure mode recall function. 3 NOTE: 1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. Delete the memorized abnormal condition. 3 Release the failure mode recall function. 3 3 Refer to the service manual of indoor unit. Release the failure mode recall function. 3 OBH702C 68 3. Outdoor unit failure recall mode tableThe left lamp of OPERATION IN-DICATOR lamp (Indoor unit)Abnormal point(Failure mode/protection)LED indication(Outdoor P.C. board)Condition Remedy Indoor/outdoor unit failure mode recall functionLED 1 LED 2 OFF None (Normal) Lighted Lighted 2-time ﬂ ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or converter protection cut-out or bus-bar voltage protection cut-out operates 3 consecutive times within 3 minutes after start-up. • Check the connection of the com- pressor connecting wire. • Refer to 11-6. "How to check inverter/compres- sor". • Check the stop valve. ○ 3-time ﬂ ash Discharge temperature thermistor Lighted Once A thermistor shorts or opens during compressor running. • Refer to 11-6. "Check of outdoor thermistors". ○ Defrost thermistor Lighted Once Ambient temperature thermistor Lighted Twice Fin temperature thermistor Lighted 3 times P.C. board temperature thermistor Lighted 4 times • Replace the outdoor control P.C. board. Outdoor heat exchanger tem- perature thermistor Lighted 9 times • Refer to 11-6. "Check of outdoor thermistors". 4-time ﬂ ash Overcurrent Once Not lighted 21 A (MXZ-3C24/3C30/4C36NA, MXZ-3C24/ 3C30/4C36NA2)/28 A (MXZ-5C42NA, MXZ- 2C20/3C24/3C30NAHZ, MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ2) current flows into power module. • Reconnect compressor connector. • Refer to 11-6. "How to check in- verter/compressor". • Check the stop valve. — 5-time ﬂ ash Discharge temperature Lighted Lighted The discharge temperature exceeds 222.8°F (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/ 4C36NA2)/240.8°F (MXZ-2C20/3C24/3C30 NAHZ, 5C42NA, MXZ-2C20/3C24/3C30 NAHZ2, 5C42NA2) during operation. Compressor can restart if discharge tempera- ture thermistor reads 203°F (MXZ-3C24/3C30 /4C36NA, MXZ-3C24/3C30/4C36NA2)/212°F (MXZ-2C20/3C24/3C30NAHZ, 5C42NA, MXZ-2C20/3C24/3C30NAHZ2, 5C42NA2) or less 3 minutes later. • Check refrigerant circuit and refrig- erant amount. • Refer to 11-6. "Check of LEV". — 6-time ﬂ ash High pressure Lighted Lighted The outdoor heat exchanger temperature ex- ceeds 158°F during cooling or the indoor gas pipe temperature exceeds 158°F during heating. • Check refrigerant circuit and refrig- erant amount. • Check the stop valve. — 7-time ﬂ ash Fin temperature 3 times Not lighted The fin temperature exceeds 190°F (MXZ- 3C24/3C30/4C36NA, MXZ-3C24/3C30/ 4C36NA2)/192°F (MXZ-2C20/3C24/ 3C30NAHZ, 5C42NA, MXZ-2C20/3C24/3C30 NAHZ2, 5C42NA2) during operation. • Check around outdoor unit. • Check outdoor unit air passage. • Refer to 11-6. "Check of outdoor fan motor". —P.C. board temperature 4 times Not lighted The P.C. board temperature exceeds 152°F (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/ 4C36NA2)/189°F (MXZ-2C20/3C24/3C30 NAHZ, 5C42NA, MXZ-2C20/3C24/3C30 NAHZ2, 5C42NA2) during operation. 8-time ﬂ ash Outdoor fan motor Lighted Lighted A failure occurs 3 consecutive times within 30 seconds after the fan gets started. • Refer to 11-6. "Check of outdoor fan motor".— 9-time ﬂ ash Outdoor control system Lighted 5 times Nonvolatile memory data cannot be read properly. • Replace the outdoor control P.C. board.○ 10-time ﬂ ash Low discharge temperature protection Lighted Lighted The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102.2°F for more than 20 minutes. • Check refrigerant circuit and refrig- erant amount. • Refer to 11-6. "Check of LEV". — 11-time ﬂ ash Communication error between P.C. boards Lighted 6 times Communication error occurs between the out- door control P.C. board and outdoor power P.C. board for more than 10 seconds. • Check the connecting wire between outdoor control P.C. board and out- door power P.C. board. — The communication between boards protec- tion cut-out operates 2 consecutive times.○ Current sensor Lighted 7 times A short or open circuit is detected in the cur- rent sensor during compressor operating.— — Current sensor protection cut-out oper- ates 2 consecutive times.○ Zero cross detecting circuit 5 times Not lighted Zero cross signal cannot be detected while the compressor is operating. • Check the connecting wire among outdoor control P.C. board and out- door power P.C. board. — The protection cut-out of the zero cross de- tecting circuit operates 10 consecutive times.○ Converter 5 times Not lighted A failure is detected in the operation of the converter during operation. • Check the voltage of power supply. • Replace the outdoor power P.C. board.—Bus-bar voltage 6 times Not lighted The bus-bar voltage exceeds 400 V or falls to low level during compressor oper- ating. • Check the voltage of power supply. • Replace the outdoor control P.C. board. 15-time ﬂ ash LEV and drain pump Lighted Lighted The indoor unit detects an abnormality in the LEV and drain pump. • Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor unit.— NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-4.). OBH702C 69 Operation start Check the outdoor unit LED indicator. Refer to 11-6. "Check of power supply". ,QGRRUXQLW serial signal error Refer to 11-6. "How to check miswiring and serial signal error". &22/RU HEAT operation only Refer to 11-6. "Check of R.V. coil". :KHQFRROLQJ room is not cool. Refer to 11-6. "How to check inverter/ compressor". :KHQFRROLQJKHDW exchanger of non-operating indoor unit frosts. :KHQKHDWLQJQRQ operating indoor unit gets warm. Refer to 11-6. "Check of LEV". :KHQKHDWLQJ room does not get warm. Refer to 11-6. "How to check inverter/compressor". &KHFNPLVSLSLQJ shortage of capacity. :KHQFRROLQJ dew drops in the non-operating indoor unit. Check of miss-piping. Refer to 11-4. "Troubleshooting check table". Both LED1 and LED2 are OFF. Both LED1 and LED2 are lighting. LED1 or LED2 has blinked. 11-3. INSTRUCTION OF TROUBLESHOOTING• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page. OBH702C 70 11-4. TROUBLESHOOTING CHECK TABLENo. Symptom Indication Abnormal point / Con-dition Condition RemedyLED1(Red) LED2(Yellow)1 Outdoor unit does not operate. Lighted Once LEV and drain pump The indoor unit detects an abnormality in the LEV and drain pump.• Refer to 11-6. "Check of LEV".• Check the drain pump of the indoor unit. 2 Lighted Twice Outdoor power system Overcurrent protection cut-out operates 3 consecu- tive times within 1 minute after the compressor gets started, or converter protection cut-out or bus- bar voltage protection cut-out operates 3 consecu- tive times within 3 minutes after start-up. • Check the connection of the compressor connect- ing wire. • Refer to 11-6. "How to check inverter/compres- sor". • Check the stop valve. 3 Lighted 3 times Discharge temperature thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 10 minutes of compressor start-up. • Refer to 11-6. "Check of outdoor thermistors". 4 Lighted 4 times Fin temperature thermistor A short or open circuit is detected in the thermistor during operation. • Refer to 11-6. "Check of outdoor thermistors". P. C. board tempera- ture thermistor • Replace the outdoor control P.C. board. 5 Lighted 5 times Ambient temperature thermistor A short or open circuit is detected in the thermistor during operation. • Refer to 11-6. "Check of outdoor thermistors". Outdoor heat ex- changer temperature thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating) of compressor start-up. Defrost thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes of compressor start-up. 6 Lighted 6 times Zero cross detecting circuit (Outdoor control P.C. board) Zero cross signal cannot be detected. • Replace the outdoor control P.C. board. 7 Lighted 7 times Outdoor control system The nonvolatile memory data cannot be read properly.• Replace the outdoor control P.C. board. 8 Lighted 8 times Current sensor Current sensor protection cut-out operates 2 con- secutive times.• Replace the outdoor power P.C. board. 9 Lighted 11 times Communication error between P.C. boards The communication protection cut-out between boards operates 2 consecutive times. • Check the connecting wire between outdoor con- trol P.C. board and outdoor power P.C. board. M-NET communication error M-NET adapter P.C. board detects an abnormality in the communication error. • Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal bed. 10 Lighted 12 times Zero cross detecting circuit The protection cut-out of the zero cross detecting circuit operates 10 consecutive times. • Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board. 11 Lighted 13 times Current sensor A short or open circuit is detected in the input cur- rent detection circuit during operation.• Replace the outdoor power P.C. board. 12 Lighted 14 times Voltage sensor A short or open circuit is detected in the input volt- age detection circuit during operation.• Replace the outdoor power P.C. board. 13 Lighted 15 times Relay operation No relay operation is detected during operation. • Replace the outdoor power P.C. board. 14 'Outdoor unit stops and restarts 3 minutes later' is repeated. Twice Not lighted IPM protection Overcurrent is detected after 30 seconds of com- pressor start-up. • Reconnect compressor connector. • Refer to 11-6. "How to check inverter/ compressor". • Check the stop valve. • Check the power module (PAM module).Lock protection Overcurrent is detected within 30 seconds of com- pressor start-up. 15 3 times Not lighted Discharge temperature protection The discharge temperature exceeds 222.8°F (MXZ- 3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2)/ 240.8°F (MXZ-2C20/3C24/3C30NAHZ, 5C42NA, MXZ-2C20/3C24/3C30NAHZ2, 5C42NA2) during operation. Compressor can restart if discharge temperature thermistor reads 203°F (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2)/212°F (MXZ-2C20/ 3C24/3C30NAHZ, 5C42NA, MXZ-2C20/3C24/ 3C30NAHZ2, 5C42NA2) or less 3 minutes later. • Check the amount of gas and refrigerant circuit. • Refer to 11-6. "Check of LEV". 16 4 times Not lighted Fin temperature protection The ﬁ n temperature exceeds during operation. •Check refrigerant circuit and refrigerant amount. •Refer to 11-6. "Check of outdoor fan motor".P.C. board temperature protection The P.C. board temperature exceeds during opera- tion. 17 5 times Not lighted High-pressure protection High-pressure is detected with the high-pressure switch (HPS) during operation.• Check around of gas and the refrigerant circuit. • Check the stop valve.The outdoor heat exchanger temperature exceeds 158°F during cooling or the indoor gas pipe tem- perature exceeds 158°F during heating. 18 6 times Not lighted Pre-heating protection Overcurrent is detected during pre-heating. • Reconnect compressor connector. • Refer to 11-6. "How to check inverter/ compressor". • Check the power module. 19 8 times Not lighted Converter protection A failure is detected in the operation of the convert- er during operation.• Replace the outdoor power P.C. board. 20 9 times Not lighted Bus-bar voltage protection The bus-bar voltage exceeds 400 V or falls to low level during compressor operating. • Check the voltage of power supply. • Replace the outdoor power P.C. board or the out- door control P.C. board. • Refer to 11-6. "Check of bus-bar voltage". OBH702C 71 No. Symptom Indication Abnormal point / Con-dition Condition RemedyLED1(Red) LED2(Yellow)21 'Outdoor unit stops and restarts 3 minutes later' is repeated. 11 times Not lighted Low out side tempera-ture protection(cooling)The ambient became 10.4°F or less. —Low out side tempera- ture protection(Heating) The ambient became 1.4°F or less. (MXZ-3C24/ 3C30/4C36/5C42NA, MXZ-3C24/3C30/4C36/ 5C42NA2) The ambient became -18°F or less. (MXZ-2C20/ 3C24/3C30NAHZ, MXZ-2C20/3C24/3C30NAHZ2) 22 13 times Not lighted Outdoor fan motor A failure occurs 3 consecutive times within 30 seconds after the fan gets started.• Refer to 11-6. "Check of outdoor fan motor". 23 Lighted 8 times Current sensor protec- tion A short or open circuit is detected in the current sensor during compressor operating.• Replace the outdoor power P.C. board. 24 Lighted 11 times Communication between P.C. boards protection Communication error occurs between the outdoor control P.C. board and outdoor power P.C. board for more than 10 seconds. • Check the connecting wire between outdoor con- trol P.C. board and outdoor power P.C. board. 25 Lighted 12 times Zero cross detecting circuit protection Zero cross signal cannot be detected while the compressor is operating. • Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board. 26 Outdoor unit operates.Once Lighted Primary current protec- tion The input current exceeds 18.4 A (MXZ-3C24/ 3C30/4C36NA, MXZ-3C24/3C30/4C36NA2)/ 26.8 A (MXZ-2C20/3C24/3C30NAHZ, 5C42NA, MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2). These symptoms do not mean any abnormality of the product, but check the following points. • Check if indoor ﬁ lters are clogged. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. 27 Twice Lighted High-pressure protec- tion The indoor gas pipe temperature exceeds 113°F during heating. Defrosting in cooling The indoor gas pipe temperature falls 37.4°F or below during cooling. 28 3 times Lighted Discharge temperature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 122°F(COOL mode)/104°F(HEAT mode) for more than 40 minutes. • Check refrigerant circuit and refrigerant amount. • Refer to 11-6. "Check of LEV". • Refer to 11-6. "Check of outdoor thermistors". 29 4 times Lighted Low discharge temperature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 102.2°F for more than 20 minutes. • Refer to 11-6. "Check of LEV". • Check refrigerant circuit and refrigerant amount. 30 5 times Lighted Cooling high-pressure protection The outdoor heat exchanger temperature exceeds 136.4°F during operation. This symptom does not mean any abnormality of the product, but check the following points. • Check if indoor ﬁ lters are clogged. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. 31 7 times Lighted High Low Pressure bypass valve Cooling evaporating temperature drop prevention control During cooling operation, the temperature of indoor heat exchanger becomes 37.4°F or less within 1 hour after the compressor starts running, or it be- comes less than 53.6°F - 60.8°F* later than that. * It depends on the difference between the set temperature and the room temperature. (MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2) This symptom does not mean any abnormality of the product, but check the following points. • Check the indoor ﬁ lters are not clogged. • Check there is sufﬁ cient refrigerant. • Check the indoor/outdoor unit air circulation is not short cycled. 32 11 times Lighted M-NET communication error M-NET adapter P.C. board detects an abnormality in the communication error. • Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal block. 33 Outdoor unit operates normally. 7 times Lighted High Low pressure bypass valve High pressure protec- tion control at start-up of heating operation The room temperature is 75.2°F or more when 1 or 2 unit(s) start(s) the heating operation. (MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2) This symptom does not mean any abnormality of the product. High Low pressure bypass valve Compressor oil temper- ing control at start-up of heating operation Both the following are true: • The outside temperature is 28.4°F or less when the heating operation is started. • [(Discharge temperature) - (Indoor heat exchang- er temperature)] < 9°F (MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2) 34 8 times Lighted Cooling evaporating temperature protection During cooling operation, the temperature of indoor heat exchanger becomes 44.6°F - 51.8°F* or less within 1 hour after the compressor starts running, or it becomes 48.2°F - 62.6°F* or less later than that. * It depends on the indoor unit type/model or the difference between the set temperature and the room temperature. 35 9 times Lighted Inverter check mode The unit is operated with emergency operation switch.— 36 Lighted Lighted Normal —— NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation. The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”. ON OFF 2.5-second OFF 2.5-second OFF 0.5-second ON 0.5-second ON LED1 LED2 Lighted Outdoor control P.C. board (Parts side) OBH702C 72 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NAMXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 W UV WHT RED BLK LEV WHT RED YLW ORN BLU Linear expansion valve 37.4 - 53.9 NormalColor of lead wire WHT - RED RED - ORN YLW - RED RED - BLU High pressure switch (HPS) Pressure Normal HPS 537 ± 22 PSIG 696 PSIG Open Close +7-15 Discharge temperature thermistor (RT62) Measure the resistance using a tester. (Part temperature: 14°F - 104°F) Measure the resistance using a tester. (Part temperature: 14°F - 104°F) Part name Check method and criterion Measure the resistance between terminals using a tester. (Winding temperature: 14°F - 104°F) Compressor Outdoor fan motor R.V. coil Defrost thermistor (RT61) Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Measure the resistance with a tester. Refer to 11-7. “Test point diagram and voltage”, 1. ”Outdoor control P.C.board”, 2. ”Outdoor power P.C. board”, for the chart of thermistor. Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to 11-7. “Test point diagram and voltage”,1. ”Outdoor control P.C. board” for the chart of thermistor. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Normal (Each phase) NN Normal (Each phase) Measure the resistance between terminals using a tester. (Winding temperature: 14°F - 104°F) MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Normal (Each phase) NN Normal (Each phase) 5HIHUWR Normal Measure the resistance using a tester. (Part temperature: 14°F - 104°F)2-way valve solenoid coil MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Measure the resistance using a tester. (Part temperature: 14°F - 104°F) NN MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Normal Measure the resistance using a tester. (Part temperature: 14°F - 104°F)Defrost heater MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 0.35N - 0.50N OBH702C 73 Check of power supplyOutdoor unit does not operate. 11-6. TROUBLESHOOTING FLOW Turn ON the power supply. No Yes Yes No No Yes Check the main power supply circuit for proper connections. Is there voltage of 208/230 VAC in the power supply terminal block? Is the output voltage from the outdoor power P.C. board 294/325 VDC? Check the power supply cable. Replace the outdoor power P.C. board. Turn OFF the power supply and recconnect the reactor. Is the reactor short-circuited?Replace the reactor. Replace the outdoor control P.C. board. OBH702C 74 Is there rated voltage in the power supply? Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? 1 Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. (Lighted or not lighted) No Yes No Yes Yes No Yes No Be sure to release the failure-mode recall function after checking. No No Yes No Yes Yes Yes No Yes Refer to indoor unit service manual. Turn OFF the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Press EMERGENCY OPERATION switch once. Check the power supply. A Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1 B Turn ON the power supply. Check the wiring. Correct them. Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal> Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage> Replace the indoor electronic control P.C. board. 2 Be careful of the residual voltage of smoothing capacitor. Replace the outdoor control P.C. board. 2 Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block? Replace the indoor/outdoor connecting wire. Is serial signal error indicated 6 minutes later? Yes No · Turn OFF inverter-controlled lighting equipment. · Turn OFF the power supply and then turn ON again. · Press EMERGENCY OPERATION switch. B · Reinstall either the unit or the light away from each other. · Attach a filter on remote control receiving section of the indoor unit. A Is serial signal error indicated 6 minutes later? No Does the LED on the outdoor control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? LED indication for communication status Communication status is indicated by the LED. Blinking: normal communication Lighting: abnormal communication or not connected Pattern 1 and 2 is repeatedly displayed alternately. Each pattern is displayed for 15 seconds. NOTE: "Lighting" in the table below does not indicate abnormal communication. Unit status Outdoor control P.C. board Blinking LED1 LED2 LED3 LED 1 LED 3LED 2Pattern 1 2 3 Unit Bstatus Unit Cstatus Unit Astatus Unit Dstatus Unit Estatus Not lighted Lighted Blinking How to check miswiring and serial signal error (when outdoor unit does not work) • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate.• When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. OBH702C 75 Check of R.V. coilThe cooling operation or heating operation does not operate. No Yes No Yes No Yes No Yes 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode. Is there voltage of 208/230 VAC between pin1 and pin2 at connector CN712? Turn OFF the power supply. Disconnect the connector CNAC2. Replace the 4-way valve. Replace the outdoor control P.C. board. Replace the R.V. coil. Is there voltage 208/230 VAC between the pin1 and pin3 at connector CNAC? Replace the outdoor power P.C. board. Is there normal resistance to R.V. coil? (Refer to 11-5.) 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 208/230 VAC between pin1 and pin2 at connector CN712?Replace the 4-way valve. Replace the outdoor control P.C. board. :KHQFRROLQJRSHUDWLRQGRHVQRWZRUN :KHQKHDWLQJRSHUDWLRQGRHVQRWZRUN CNAC CN712 Outdoor control P.C. board CNAC2 Outdoor power P.C. board OBH702C 76 Check of LEV No Yes No Yes Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Is "click - click" sound heard? Or, do you feel vibration of LEV coil with your hand? Disconnect the connectors. CN791: LEV A, CN792: LEV B, CN793: LEV C (MXZ-3C/4C/5C), CN794: LEV D (MXZ-4C/5C), CN795: LEV E (MXZ-5C) Is there normal resistance to LEV coil? (Refer to 11-5.) Normal Replace the outdoor control P.C. board. Replace LEV coil. • When cooling, heat exchanger of non-operating indoor unit frosts.• When heating, non-operating indoor unit gets warm. CN791 CN792 CN793 CN794 CN795 Outdoor control P.C. board OBH702C 77 How to check inverter/compressor• When heating, room does not get warm.• When cooling, room does not get cool. Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION. Is output balanced? Clarify the causes by counting time until the inverter stops. 0 to 10 seconds: compressor layer short 10 to 60 seconds: compressor lock 60 seconds to 5minutes: refrigerant circuit defective 5 minutes or more: normal Turn OFF the power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals. Is the resistance between each terminal normal? (Refer to 11-5.) Is the input voltage to the outdoor control P.C. board 370 VDC or more? Reconnect the lead wire of compressor, and turn ON the power supply to indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION. Replace the compressor. Replace the outdoor power P.C. board. $IWHUWKHRXWGRRUIDQVWDUWVUXQQLQJZDLWIRUPLQXWH or more before measuring the voltage. 7KHRXWSXWYROWDJHYDOXHVKDYHWKHWROHUDQFHRI 7KHRXWSXWGLIIHUVGHSHQGLQJRQWKHFDSDFLW\RUWKH number of indoor units to be operated. Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT) V (WHT) - W (RED) W (RED) - U (BLK) Output voltage: 99 Is proper output voltage detected? No No Yes Yes Yes No Yes No OBH702C 78 Check of outdoor thermistors• When thermistor is abnormal. Thermistor Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temperature Symbol RT61 RT62 RT68 RT65 RT64 Connector, Pin No. Between CNTH1 pin1 and pin2 Between CNTH1 pin3 and pin4 Between CNTH1 pin7 and pin8 Between CNTH2 pin1 and pin2 Between CN171 pin1 and pin2 Outdoor control P.C. board Outdoor power P.C. board Board Normal Yes No AbnormalDisconnect the connector in the following table and measure the resistance of the thermistor to check whether the thermistor is normal or not. (Refer to 11-7.) Does the unit operate 10 minutes or more without showing thermistor abnormality? Normal Replace the outdoor control P.C. board or the outdoor power P.C. board. Reconnect the connector in the following table and disconnect the lead wire leading to the compressor. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION. (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2) Replace the thermistor. (MXZ-5C42NA,MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ, MXZ-2C20/3C24/3C30NAHZ2) Replace the thermistor except RT64. If RT64 is abnormal, replace the outdoor power P.C. board since RT64 is combined with this board. OBH702C 79 No Yes No Yes No Yes No Yes No Yes Disconnect CNF1 and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to right table) Turn on the power supply to start operation and measure the voltage of connector CNF1. Turn OFF the power supply and connect the connector CNF1. Turn ON the power supply and measure the voltage of connector CNF1 while rotating the motor by the hand. Does the outdoor fan motor rotate smoothly? Replace the outdoor fan motor.Resistance N N Measuring points * To measure the resistance, connect the negative (-) end of the tester to pin4. * To measure the voltage, connect the negative (-) end of the tester to pin4. * Voltage between pin4 and 6 should be measured within 1 minute after the operation starts. pin1 - pin4 pin5 - pin4 pin6 - pin4 pin7 - pin4Voltage 15 VDC 294/325 VDC 1 - 5 VDC CNF1 pin1 - pin4 pin5 - pin4 pin6 - pin4 Is the voltage of connector CNF1 normal? (Refer to right table.) Does the voltage between pin7 and pin4 of connector CNF1 repeat 0V and 5V?Replace the outdoor fan motor. Does the fan motor operate for about 5 seconds?Replace the outdoor fan motor. Replace the outdoor fan motor. Start operation. Replace the outdoor control P.C. board. Replace the outdoor control P.C. board. CNF1 Outdoor control P.C. board Check of outdoor fan motor• Fan motor does not operate or stops operating shortly after starting the operation. OBH702C 80 The other cases Indoor unit does not operate. (different operating models in multi system) • When you try to run 2 indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal to the outdoor units ﬁ rst decides the operation mode. • When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and then turn them back ON. • Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that the refrigerant gas continuously ﬂ ows into the indoor unit even while it is not operating. • When the operation frequency does not go up from the lowest frequency. Check of bus-bar voltage •Check the voltage of power supply. •Conﬁ rm outdoor unit failure mode recall function. (Refer to 11-2.2.) Blink 5 times Conﬁ rm LED1 indication lamp on the outdoor control P.C. board. Replace the outdoor power P.C. board. Blink 9 times Replace the outdoor control P.C. board. Turn OFF power supply before removing P.C. board. Conﬁ rm LED1 indication lamp on the outdoor control P.C. board. Turn ON power supply. Start operation. Lighting Replace the outdoor control P.C. board. Blink 9 times Replace the outdoor power P.C. board. Conﬁ rm LED1 indication lamp on the outdoor control P.C. board. Turn ON power supply. Start operation. NormalLighting Lighting Check of HPS Infinity No Yes 1. Disconnect the connector CN63H in the outdoor control P.C. board. 2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF. Check the resistance between each terminal. Reconnect CN63H. Turn ON the power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION. Is HPS protection displayed immediately after compressor starts? Replace HPS. Replace the outdoor control P.C. board. Normal CN63H Outdoor control P.C. board OBH702C 81 11-7. TEST POINT DIAGRAM AND VOLTAGE1. Outdoor control P.C. boardMXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 0 102030405060708090100110120 32 50 68 86 104 122 140 158 176 194 212 230 248 700600500 400 300 200 100 0 (ºC) (ºF) Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.85HVLVWDQFHNTemperature 273+t 1 373 1 Discharge temperature thermistor (RT62) -20-100 10203040 -4 14 32 50 68 86 104 (ºC) (ºF) 100 90 80 70 60 50 40 30 20 10 05HVLVWDQFHNTemperature 273+t 1 298 1 Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2% Rt = 10exp{3950( )} t : ºC = (ºF - 32)/1.8 Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperature thermistor (RT68) CN601 230 VAC Room AInput Room B Room C Room D Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) CNTH1 CNTH2 Ambient temperature thermistor (RT65) SW1 LED3 LEV: 12 VDC pulse wave LED2 LED1 SW2 SW871 CN712 R.V. coil 208/230 VAC Output CN713 Valve coil 208/230 VAC Output CN714 Base heater 208/230 VAC Output CNAC to outdoor power P.C. board 208/230 VAC Input F711 FUSE T3.15AL250V CN611 Serial signal 12 ~ 24 V CN621 ((-)CN701 Signal transmission(To power board)5 VDC pulse waveCN702 Signal transmission(To power board)5 VDC pulse wave(+)(+)(-)(-)15 V(-)15 VCN63H High pressure switch CNDC Bus-bar voltage 290 ~ 370 VDC Bus-bar voltage 290 ~ 370 VDC 15 VDC CNF1 To fan motor VFG (Rotate signal) (Voltage between right pins of PC931, pin 3 and pin 4) (Same as &1)í VSP (Rotate instruction) (Voltage between pins of C930): 0 V DC (when stopped), 1.8 - 6.5 V DC (when operated) (Correspond to &1)í CN741 Signal translation (To Communication adaptor board)CN791 LEV Room ACN792 LEV Room BCN794 LEV Room DCN793 LEV Room COBH702C 82 MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZMXZ-3C30NAHZ 0 102030405060708090100110120 32 50 68 86 104 122 140 158 176 194 212 230 248 700600500 400 300 200 100 0 (ºC) (ºF) Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.85HVLVWDQFHNTemperature 273+t 1 373 1 Discharge temperature thermistor (RT62) -20 -10 0 10 20 30 40 -4 14 32 50 68 86 104 (ºC) (ºF) 100 90 80 70 60 50 40 30 20 10 05HVLVWDQFHNTemperature 273+t 1 298 1 Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2% Rt = 10exp{3950( )} t : ºC = (ºF - 32)/1.8 Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperature thermistor (RT68) CN601 230 VAC Room AInput Room B Room C Room D Room E Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) CNTH1 CNTH2 Ambient temperature thermistor (RT65) SW1 LED3 LEV: 12 VDC pulse wave LED2 LED1 SW2 SW871 CN712 R.V. coil 208/230 VAC Output CN713 Valve coil 208/230 VAC Output CN714 Base heater 208/230 VAC Output CNAC to outdoor power P.C. board 208/230 VAC Input F711 FUSE T3.15AL250V CN611 Serial signal 12 ~ 24 V CN621 CN791 LEV Room A(CN792 LEV Room BCN794 LEV Room DCN795 LEV Room E(-)CN701 Signal transmission(To power board)5 VDC pulse waveCN702 Signal transmission(To power board)5 VDC pulse waveCN793 LEV Room C(+)(+)(-)(-)15 V(-)18 VCN63H High pressure switch CNDC Bus-bar voltage 290 ~ 370 VDC Bus-bar voltage 290 ~ 370 VDC 15 VDC CNF1 To fan motor VFG (Rotate signal) (Voltage between right pins of PC931, pin 3 and pin 4) (Same as &1)í VSP (Rotate instruction) (Voltage between pins of C930): 0 V DC (when stopped), 1.8 - 6.5 V DC (when operated) (Correspond to &1)í CN741 Signal translation (To Communication adaptor board) 1. Outdoor control P.C. board OBH702C 83 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 0 102030405060708090100110120 32 50 68 86 104 122 140 158 176 194 212 230 248 700600500 400 300 200 100 0 (ºC) (ºF) Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.85HVLVWDQFHNTemperature 273+t 1 373 1 Discharge temperature thermistor (RT62) -20-100 10203040 -4 14 32 50 68 86 104 (ºC) (ºF) 100 90 80 70 60 50 40 30 20 10 05HVLVWDQFHNTemperature 273+t 1 298 1 Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2% Rt = 10exp{3950( )} t : ºC = (ºF - 32)/1.8 Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperature thermistor (RT68) CN601 230 VAC Room AInput Room B Room C Room D Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) CNTH1 CNTH2 Ambient temperature thermistor (RT65) SW1 LED3 LEV: 12 VDC pulse wave LED2 LED1 SW2 SW871 CN712 R.V. coil 208/230 VAC Output CN713 Valve coil 208/230 VAC Output CN714 Base heater 208/230 VAC Output CNAC to outdoor power P.C. board 208/230 VAC Input F711 FUSE T3.15AL250V CN611 Serial signal 12 ~ 24 V CN621 CN791 LEV Room A(CN792 LEV Room BCN794 LEV Room D(-)CN701 Signal transmission(To power board)5 VDC pulse waveCN702 Signal transmission(To power board)5 VDC pulse waveCN793 LEV Room C(+)(+)(-)(-)15 V(-)15 VCN63H High pressure switch CNDC Bus-bar voltage 290 ~ 370 VDC Bus-bar voltage 290 ~ 370 VDC 15 VDC CNF1 To fan motor VFG (Rotate signal) (Voltage between right pins of PC931, pin 3 and pin 4) (Same as &1)í VSP (Rotate instruction) (Voltage between pins of C930): 0 V DC (when stopped), 1.8 - 6.5 V DC (when operated) (Correspond to &1)í CN741 Signal translation (To Communication adaptor board) 1. Outdoor control P.C. board OBH702C 84 MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2MXZ-3C30NAHZ2 0 102030405060708090100110120 32 50 68 86 104 122 140 158 176 194 212 230 248 700600500 400 300 200 100 0 (ºC) (ºF) Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.85HVLVWDQFHNTemperature 273+t 1 373 1 Discharge temperature thermistor (RT62) -20 -10 0 10 20 30 40 -4 14 32 50 68 86 104 (ºC) (ºF) 100 90 80 70 60 50 40 30 20 10 05HVLVWDQFHNTemperature 273+t 1 298 1 Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2% Rt = 10exp{3950( )} t : ºC = (ºF - 32)/1.8 Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperature thermistor (RT68) CN601 230 VAC Room AInput Room B Room C Room D Room E Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) CNTH1 CNTH2 Ambient temperature thermistor (RT65) SW1 LED3 LEV: 12 VDC pulse wave LED2 LED1 SW2 SW871 CN712 R.V. coil 208/230 VAC Output CN713 Valve coil 208/230 VAC Output CN714 Base heater 208/230 VAC Output CNAC to outdoor power P.C. board 208/230 VAC Input F711 FUSE T3.15AL250V CN611 Serial signal 12 ~ 24 V CN621 CN791 LEV Room A(CN792 LEV Room BCN794 LEV Room DCN795 LEV Room E(-)CN701 Signal transmission(To power board)5 VDC pulse waveCN702 Signal transmission(To power board)5 VDC pulse waveCN793 LEV Room C(+)(+)(-)(-)15 V(-)18 VCN63H High pressure switch CNDC Bus-bar voltage 290 ~ 370 VDC Bus-bar voltage 290 ~ 370 VDC 15 VDC CNF1 To fan motor VFG (Rotate signal) (Voltage between right pins of PC931, pin 3 and pin 4) (Same as &1)í VSP (Rotate instruction) (Voltage between pins of C930): 0 V DC (when stopped), 1.8 - 6.5 V DC (when operated) (Correspond to &1)í CN741 Signal translation (To Communication adaptor board) 1. Outdoor control P.C. board OBH702C 85 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NAMXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA22. Outdoor power P.C. board Output to drive compressor Connect to earthConnect to reactor (Red line)Connect to reactor (White line) CNDC Bus-bar voltage 290 - 370 VDC CNAC1 208/230 V Output F2 FUSE T6.3AL250V F1 FUSE T6.3AL250V 208/230 VAC Input CNAC2 208/230 VAC Output Connect to earth CN152 Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave (-) (+) CN171 Fin temperature thermistor (RT64)CN151 Signal transmission(To Outdoor control P.C. board)5 VDC pulse wave(+)(-)(-)15 V15 V200 180 160 140 120 100 80 60 40 20 05HVLVWDQFHNTemperature ) & Fin temperature thermistor (RT64) Thermistor R50 = 17 k ± 2% B constant = 4150 ± 3% 5W H[S^` t : ºC = (º) 273+t 1 323 1 32 50 68 86 104 122 140 158 176 01020304050607080 OBH702C 86 MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZMXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ22. Outdoor power P.C. board CN152 Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave Output to drive compressor CNDC Bus-bar voltage 290 - 370 VDCCN171 Fin temperature thermistor (RT64) 208/230 VAC InputCNAC2 208/230 VAC Output CNAC1 208/230 V Output Connect to earth Connect to earth Connect to earth Connect to reactor (Red line) F2 FUSE T6.3AL250V F1 FUSE T6.3AL250V Connect to reactor (White line) (-) (+)CN151 Signal transmission(To Outdoor control P.C. board)5 VDC pulse wave(+)(-)(-)15 V15 V18 V200 180 160 140 120 100 80 60 40 20 05HVLVWDQFHNTemperature ) & Fin temperature thermistor (RT64) Thermistor R50 = 17 k ± 2% B constant = 4150 ± 3% 5W H[S^` t : ºC = (º) 273+t 1 323 1 32 50 68 86 104 122 140 158 176 01020304050607080 OBH702C OPERATING PROCEDURE PHOTOS 1. Removing the panels (1) Remove the screws fixing the top panel, and remove the top panel. (2) Remove the screws fixing the service panel. (3) Pull down the service panel, and remove the service panel. (4) Disconnect the power supply and indoor/outdoor connect- ing wire. (5) Remove the screws fixing the front panel, and remove the front panel. (6) Remove the screws fixing the back panel, and remove the back panel. 87 12-1. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Photos: MXZ-4C36NA MXZ-4C36NA2 NOTE: Turn OFF the power supply before disassembly. Photo 1 Photo 3 Screws of the service panel Screws of the front panel Catch of the front panelCatch of the front panel Screws of the top panel Screws of the front panel Screws of the top panel Screws of the back panel Photo 2 DISASSEMBLY INSTRUCTIONS12 (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. Slide the sleeve. Pull the terminal while pushing the locking lever. Hold the sleeve, and pull out the terminal slowly. The terminal which has the locking mechanism can be detached as shown below.There are 2 types ( Refer to (1) and (2)) of the terminal with locking mechanism.The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. <"Terminal with locking mechanism" Detaching points> Connector Sleeve Locking lever OBH702C OPERATING PROCEDURE PHOTOS2. Removing the outdoor control P.C. board, the reac-tor and the outdoor power P.C. board (1) Remove the top panel and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Disconnect the connectors on the outdoor control P.C. board. (4) Remove the screws fixing the outdoor control P.C. board holder, and remove the outdoor control P.C. board. (5) Disconnect the lead wire from the reactor. (6) Remove the screws fixing the reactor, and remove the reactor. (7) Disconnect the lead wire of the power P.C. board. (8) Disconnect the catches of the PB cover, and remove the PB cover. (9) Remove the outdoor power P.C. board. 88 Photo 4 Catches of the PB cover Photo 5 Screws of the outdoor control P.C. board holder Screws of the reactor Photo 6 Screws of the electrical parts OBH702C OPERATING PROCEDURE PHOTOS3. Removing the fan motor(1) Remove the top panel, the service panel, and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. NOTE: The propeller fan nut is a revers thread. 4. Removing the compressor and 4-way valve (1) Remove the top panel, the service panel, and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire, and remove the back panel. (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (4) Disconnect the compressor lead wire from the terminal of the compressor (U, V, W). (5) Disconnect the outdoor control P.C. board connectors: CNF1, CNTH1, CNTH2, CN63H, CN712, CN791, CN792, CN793, CN794 (MXZ-4C) (6) Remove the screws fixing the electrical parts, and remove the electrical parts (Photo 4). (7) Remove the propeller fan. (8) Remove the screws fixing the separator, and remove the separator. (9) Remove the sound proof felt. (10) Detach the brazed parts of the compressor suction and discharge pipes (Photo 9). (11 ) Remove the compressor nuts and remove the compressor (Photo 9). (12) Detach the brazed parts of 4-way valve and pipes. 89 4-way valve R.V. coil Brazed parts Photo 8 Photo 7 Propeller fan Screws of the outdoor fan motor OBH702C OPERATING PROCEDURE PHOTOS5. Removing the expansion valve(1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (Gas recovery is not required if the unit is pumped down.) (3) Remove the LEV coils. (4) Detach the brazed parts of the expansion valves and pipes. 90 Photo 9 Suction pipe brazed part Compressor nuts LEV coils Expansion valves Expansion valves Discharge pipe brazed part OBH702C 12-2. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Photos: MXZ-3C30NAHZ MXZ-3C30NAHZ2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panels (1) Remove the screws fixing the top panel, and remove the top panel. (2) Remove the screws fixing the service panel. (3) Pull down the service panel, and remove the service panel. (4) Disconnect the power supply and indoor/outdoor connect- ing wire. (5) Remove the screws fixing the front panel, and remove the front panel. (6) Remove the screws fixing the back panel, and remove the back panel. 91 Photo 1 Screws of the service panelScrews of the front panel Screws of the top panel Screws of the top panel Screws of the back panel Photo 2 Photo 3 Screws of the front panel Screw of the back panel OBH702C OPERATING PROCEDURE PHOTOS2. Removing the outdoor control P.C. board, the reac-tor and the outdoor power P.C. board (1) Remove the top panel, the service panel and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Disconnect the connectors on the outdoor control P.C. board. (4) Remove the screws fixing the outdoor control P.C. board, and remove the outdoor control P.C. board. (5) Remove the screws fixing the electrical parts, and remove the electrical parts. (6) Remove the screws fixing the TB support, and remove the TB support. (7) Remove the screws fixing the control box separator, and remove the control box separator. (8) Disconnect the lead wire of the outdoor power P.C. board. (9) Remove the screws fixing the outdoor power P.C. board, and remove the outdoor power P.C. board with the out- door P.C. board holder. (10) Remove the screws fixing the control box F, and remove the control box F. (11 ) Remove the screws fixing the reactors, and remove the reactors. 92 Photo 4 Screws of the electrical parts Photo 5 Screws of the outdoor control P.C. board Photo 6 Screws of the outdoor power P.C. board Screws of the control box separator Screws of the TB support Screws of the control box F Photo 7 Photo 8 Screws of the reactor Screw of the electrical parts OBH702C OPERATING PROCEDURE PHOTOS3. Removing the fan motor(1) Remove the top panel, the service panel, and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. NOTE: The propeller fan nut is a revers thread. 4. Removing the compressor and 4-way valve (1) Remove the top panel, the service panel and the front panel. (2) Disconnect the power supply and indoor/outdoor connect- ing wire, and remove the back panel. (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (5) Disconnect the compressor lead wire from the terminal of the compressor (U, V, W). (6) Disconnect the outdoor control P.C. board connectors: CNF1, CNTH1, CNTH2, CN63H, CN712, CN713, CN714 (MXZ-C·NAHZ, MXZ-C·NAHZ2), CN791, CN792, CN793 (MXZ-5C42NA, MXZ-3C24/30NAHZ, , MXZ-5C42NA2 MXZ-3C24/30NAHZ2), CN794 (MXZ-5C42NA, MXZ- 5C42NA2), CN795 (MXZ-5C42NA, MXZ-5C42NA2) (7) Remove the screws fixing the electrical parts, and remove the electrical parts (Photo 4). (8) Remove the propeller fan. (9) Remove the screws fixing the VB fixture, and remove the VB fixture. (10) Remove the screws fixing the separator, and remove the separator. NOTE: When installing the separator, insert the tabs of the heat exchanger into the separator. (11 ) Remove the sound proof felt. (12) Detach the brazed parts of the suction and discharge pipes (Photo 11). (13) Remove the nuts of the compressor, and remove the compressor (Photo 11). (14) Detach the brazed parts of 4-way valve and pipes. 93 4-way valve R.V. coil Brazed parts Photo 10 Photo 9 Propeller fan Separator Sound proof felt Screws of the outdoor fan motor Screws of the outdoor fan motor Screw of the VB fixture VB fixture OBH702C OPERATING PROCEDURE PHOTOS5. Removing the expansion valve(1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (Gas recovery is not required if the unit is pumped down.) (3) Remove the LEV coils. (4) Detach the brazed parts of expansion valves and pipes. 94 Photo 11 Suction pipe brazed part Compressor nuts LEV coils Expansion valves Discharge pipe brazed part OBH702C 95OBH702C HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2016. No. OBH702 REVISED EDITION-C Distributed in Feb. 2016. No. OBH702 REVISED EDITION-B Distributed in Oct. 2014. No. OBH702 REVISED EDITION-A Distributed in Sep. 2014. No. OBH702 Made in Japan New publication, effective Mar. 2016 Specifications are subject to change without notice.