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Revision A: • MXZ-3C24NA, MXZ-3C30NA and MXZ4C36NA have been added. Please void OBH702. OUTDOOR INDOOR UNIT UNIT HFC utilized SERVICE MANUAL No. OBH702 REVISED EDITION-A R410A Models MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 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 CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. NOISE CRITERIA CURVES ·····························11 5. OUTLINES AND DIMENSIONS ······················ 13 6. WIRING DIAGRAM·········································· 18 7. REFRIGERANT SYSTEM DIAGRAM ············· 23 8. DATA ································································ 34 9. ACTUATOR CONTROL··································· 56 10. SERVICE FUNCTIONS···································· 57 11. TROUBLESHOOTING ····································· 59 12. DISASSEMBLY INSTRUCTIONS ···················· 77 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA INDOOR UNITS COMBINATION TABLES PARTS CATALOG (OBB702) TM Revision A: • MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added. Use the specified refrigerant only Never 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. 1 TECHNICAL CHANGES MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 1. New model MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 1. New model OBH702A 2 2 PART NAMES AND FUNCTIONS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA Air inlet (Back and side) Air outlet Drain outlet MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Air inlet (Back and side) Air outlet Drain outlet OBH702A 3 3 SPECIFICATION Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-3C24NA Non-Duct (06+09+09 ) Duct ( 09+09+09) 22,000 23,600 25,000 24,600 19,600 19,600 1,620 2,100 1,750 1,900 2,120 2,230 13.6 11.2 20.0 16.0 9.8 9.2 4.20 3.80 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 25 22.1 1.9 SNB220FQGMC U-V 0.95 V-W 0.95 W-U 0.95 12 13.7 LEV 51/55 Reverse cycle 37-13/32 13 31-11/32 135 Wireless type 4 Not supplied (optional parts) 1/4 A:1/2 B,C:3/8 Flared Flared 6lb. 13oz. 24.7 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 4 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-3C30NA Non-Duct (09+09+12 ) Duct ( 09+09+12) 28,400 27,400 28,600 27,600 21,000 21,000 2,680 2,860 2,150 2,220 2,120 2,140 10.6 9.6 19.0 16.2 10.6 10.6 3.90 3.64 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 25 22.1 1.9 SNB220FQGMC U-V 0.95 V-W 0.95 W-U 0.95 12 13.7 LEV 52/56 Reverse cycle 37-13/32 13 31-11/32 135 Wireless type 4 Not supplied (optional parts) 1/4 A:1/2 B,C:3/8 Flared Flared 6lb. 13oz. 24.7 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 5 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-4C36NA Non-Duct (09+09+09+09 ) Duct ( 09+09+09+09) 35,400 34,400 36,000 34,400 26,600 26,600 3,760 3,940 3,020 3,100 3,340 3,450 9.4 8.7 19.2 16.0 11.0 9.8 3.50 3.25 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 25 22.1 1.9 SNB220FQGMC U-V 0.95 V-W 0.95 W-U 0.95 12 13.7 LEV 54/56 Reverse cycle 37-13/32 13 31-11/32 137 Wireless type 4 Not supplied (optional parts) 1/4 A:1/2 B,C,D:3/8 Flared Flared 6lb. 13oz. 24.7 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 6 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-5C42NA Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) 40,500 37,500 45,000 41,000 24,400 23,000 4,403 4,112 3,575 3,463 2,943 2,869 9.2 9.0 19.7 15.2 10.3 9.1 3.69 3.47 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 40 31.9 1.9 MNB33FBTMC-L U-V 0.30 V-W 0.30 W-U 0.30 20 28.8 LEV 56/58 Reverse cycle 37-13/32 13 41-17/64 189 Wireless type 4 Not supplied (optional parts) 1/4 A:1/2 B,C,D,E: 3/8 Flared Flared 8 lb. 13 oz. 37.4 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 7 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-2C20NAHZ Non-Duct (09+09) Duct (09+12) 18,000 20,000 22,000 22,000 13,700 13,700 1,334 1,819 1,612 1,748 1,450 1,588 13.5 11.0 17.0 15.0 9.8 9.5 4.00 3.69 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 40 28.9 1.9 MNB33FBTMC-L U-V 0.30 V-W 0.30 W-U 0.30 20 28.8 LEV 54/58 Reverse cycle 37-13/32 13 41-17/64 187 Wireless type 4 Not supplied (optional parts) 1/4 A,B: 3/8 Flared Flared 8 lb. 13 oz. 37.4 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 8 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-3C24NAHZ Non-Duct (06+06+09) Duct (09+09+09) 22,000 23,600 25,000 24,600 14,000 14,000 1,630 2,360 1,725 1,871 1,622 1,635 13.5 10.0 19.0 15.5 10.0 9.0 4.25 3.80 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 40 29.9 1.9 MNB33FBTMC-L U-V 0.30 V-W 0.30 W-U 0.30 20 28.8 LEV 54/58 Reverse cycle 37-13/32 13 41-17/64 189 Wireless type 4 Not supplied (optional parts) 1/4 A: 1/2 B,C: 3/8 Flared Flared 8 lb. 13 oz. 37.4 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 9 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb. Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor Refrigerant charge (R410A) lb. Refrigeration oil (Model) oz. MXZ-3C30NAHZ Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 28,600 27,600 18,000 17,000 2,272 2,661 2,096 2,187 1,991 1,993 12.5 10.3 18.0 16.0 11.0 9.8 4.00 3.70 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 40 29.9 1.9 MNB33FBTMC-L U-V 0.30 V-W 0.30 W-U 0.30 20 28.8 LEV 54/58 Reverse cycle 37-13/32 13 41-17/64 189 Wireless type 4 Not supplied (optional parts) 1/4 A: 1/2 B,C: 3/8 Flared Flared 8 lb. 13 oz. 37.4 (FV50S) NOTE : Test conditions are based on ARI 210/240. Unit: °F Mode Cooling Heating Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Test *1: "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 *1: Standard rating-heating at rated compressor speed *2: Low temperature heating at maximum compressor speed Maximum 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 OBH702A 10 80 80 80 80 80 70 70 70 70 70 70 67 67 67 67 67 60 60 60 60 60 60 95 82 82 67 87 47 17 62 47 35 35 (75) (65) (65) (53.5) (69) 43 15 56.5 43 33 33 NOISE CRITERIA CURVES 4 MXZ-3C24NA MXZ-3C30NA FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 51 High Cooling 52 High Heating 55 High Heating 56 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 90 LINE 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 63 125 250 500 1000 2000 4000 8000 63 BAND CENTER FREQUENCIES, Hz 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MXZ-4C36NA FAN SPEED FUNCTION SPL(dB(A)) High Cooling 54 High Heating 56 LINE OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 39.4 in. NC-20 MICROPHONE 10 63 OUTDOOR UNIT 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz Test conditions Cooling: Dry-bulb temperature 95°F Wet-bulb temperature 75°F Heating: Dry-bulb temperature 45°F Wet-bulb temperature 43°F OBH702A 11 MXZ-5C42NA MXZ-2C20NAHZ FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 56 High Cooling 54 High Heating 58 High Heating 58 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 63 125 250 500 1000 2000 4000 8000 63 125 BAND CENTER FREQUENCIES, Hz 500 1000 2000 4000 8000 MXZ-3C30NAHZ FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 54 High Cooling 54 High Heating 58 High Heating 58 LINE 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 90 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 250 BAND CENTER FREQUENCIES, Hz MXZ-3C24NAHZ 20 LINE 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 63 125 250 500 1000 2000 4000 8000 63 BAND CENTER FREQUENCIES, Hz OBH702A 125 250 500 1000 2000 BAND CENTER FREQUENCIES, Hz 12 4000 8000 5 OUTLINES AND DIMENSIONS MXZ-3C24NA MXZ-3C30NA Unit: inch (mm) Conduit plates Conduit connector Lock nut OBH702A 13 Unit: inch (mm) MXZ-4C36NA Conduit plates Conduit connector Lock nut OBH702A 14 Unit: inch (mm) MXZ-5C42NA Conduit plate Top Lock nut OBH702A 15 Conduit connector Conduit plate Under MXZ-2C20NAHZ Unit: inch (mm) Lock nut Conduit plate Conduit connector OBH702A 16 MXZ-3C24NAHZ MXZ-3C30NAHZ Unit: inch (mm) Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702A 17 6 WIRING DIAGRAM MXZ-3C24NA MXZ-3C30NA OBH702A 18 MXZ-4C36NA OBH702A 19 MXZ-5C42NA L1 L2 WHT WHT RED TAB5 RED TAB3 TAB6 IC411 IC501 CIRCUIT X52CA TAB4 IC401 TB1 BREAKER TAB1 BLK L1 BLU L2 GRN/YLW GR X52CB TAB2 X65A BLK U WHT V RED W PTC1 PTC2 PTC3 TB6 F1 D1 F2 OUTDOOR POWER P.C. BOARD CB1 CB3 CB2 1 BLK 3 BLU GRY S3 12-24V S2 ~208/230V S1 BLU BLK CNAC1 CB4 V U MS W 3~ 1 7 CNF1 1 CNDC 1 3 7 CN702 BLK BLK CN171 2 1 1 CNAC 1 2 CN701 OUTDOOR CONTROL P.C. BOARD T801 5 3 F711 1 LED3 3 IC801 CN611 LED2 1 5 (BLK) CN795 CN741 (BLU) CN793 1 5 (WHT) CN791 1 5 1 CNTH1 8 (YLW) CN794 CNTH2 1 2 1 5 (RED) CN792 5 1 TB4 GRY ORN BLU YLW BLK X713 X714 WHT 5 CN712 1 5 CN713 2 1 CN714 2 1 2 CN601 CN63H 1 2 1 S3 12-24V S2 ~208/230V S1 TO INDOOR UNIT No. C ORN TB3 WHT BLU 1 X712 LED1 1 TO INDOOR UNIT No. D RT64 CN622 MC S3 12-24V S2 ~208/230V S1 BLK t° BLK BLK 5 WHT BLK BLK BLK BLK BLK BLK BLK BLK MF MS 3~ BRN CNMC RED CNAC2 3 1 BLK 7 TBE3 TBE4 BLK 1 3 TBE1 TBE2 BLK 1 CN152 1 2 BLK CN151 CNDC TO INDOOR UNIT No. E TB5 YLW BLU BLK POWER SUPPLY 208/230V 1 phase 60Hz RED BLK BLU S3 12-24V S2 ~208/230V S1 TO INDOOR UNIT No. B BLK TB2 5 t° t° RT61 RT62 SYMBOL CB1~4 D1 F1, F2 F711 HPS IC401 IC411 IC501 IC801 PTC1~3 RT61 RT62 RT64 RT65 RT68 t° RT68 t° RT65 NAME SYMBOL SMOOTHING CAPACITOR L1, L2 DIODE LED 1~3 FUSE (T6.3AL 250V) LEV A~E FUSE (T3.15AL 250V) MC HIGH PRESSURE SWITCH MF DIODE BRIDGE T801 TB1~6 POWER MODULE X52CA, B POWER MODULE X65A POWER DEVICE X712 CIRCUIT PROTECTION X713 DEFROST THERMISTOR DISCHARGE TEMP. THERMISTOR X714 21S2 FIN TEMP. THERMISTOR AMBIENT TEMP. THERMISTOR 21S4 OUTDOOR HEAT EXCHANGER TEMPERATURE THERMISTOR OBH702A 5 5 5 M M M M M LEV E LEV D LEV C LEV B LEV A NAME REACTOR LED EXPANSION VALVE COMPRESSOR FAN MOTOR TRANSFORMER TERMINAL BLOCK RELAY RELAY RELAY RELAY RELAY 2WAY VALVE SOLENOID COIL REVERSING VALVE SOLENOID COIL RED BLU 5 21S4 21S2 HPS BLK S3 12-24V S2 ~208/230V S1 NOTES: 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: 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 20 TO INDOOR UNIT No. A MXZ-2C20NAHZ OBH702A 21 MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702A 22 REFRIGERANT SYSTEM DIAGRAM 7 MXZ-3C24NA MXZ-3C30NA R.V.coil OFF ON Unit: inch (mm) Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Muffler Service port Union Header(Gas) ĭ1/2 Indoor unit A Stop valve (with service port) Compressor shell temperature thermistor RT62 4-way valve ĭ3/8 Indoor unit B Sub muffler Header (Evaporator) Outdoor heat exchanger ĭ3/8 Indoor unit C Union ĭ1/4 Strainer #100 ĭ1/4 Strainer #100 Outdoor heat exchanger temperature thermistor Ambient RT68 temperature Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Defrost temperature thermistor RT61 Strainer Distributor #50 LEVA Indoor unit A Strainer #100 LEVB Stop valve Indoor unit B ĭ1/4 Strainer #100 LEVC Indoor unit C OBH702A thermistor RT65 Capillary tube 23 Operating Range Cooling Heating MXZ-3C24NA MXZ-3C30NA Maximum Minimum Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 115°FDB 95°FDB, 71°FWB 14°FDB 67°FDB, 57°FWB 75°FDB, 65°FWB 80°FDB, 67°FWB 6°FDB, 5°FWB 70°FDB, 60°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NA MXZ-3C30NA 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. Indoor units a Max. height difference Outdoor unit c 49 ft. 49 ft. 49 ft. b 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 Outdoor unit union diameter For Indoor unit A Indoor unit B Indoor unit C OBH702A 24 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 MXZ-4C36NA R.V.coil OFF ON Unit: inch (mm) Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Muffler Service port Union Header(Gas) Stop valve (with service port) ĭ1/2 Indoor unit A Compressor shell temperature thermistor RT62 4-way valve ĭ3/8 Indoor unit B Sub muffler ĭ3/8 Indoor unit C Header (Evaporator) Outdoor heat exchanger ĭ3/8 Indoor unit D Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Union ĭ1/4 Strainer #100 LEV A ĭ1/4 Strainer #100 LEV B ĭ1/4 Strainer #100 LEV C ĭ1/4 Strainer #100 LEV D Indoor unit A Capillary tube Defrost temperature thermistor RT61 Strainer Distributor #50 Strainer #100 Indoor unit B Indoor unit C Indoor unit D OBH702A Outdoor heat exchanger temperature Ambient thermistor temperature RT68 thermistor RT65 Stop valve 25 Operating Range Cooling Heating MXZ-4C36NA Maximum Minimum Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 115°FDB 95°FDB, 71°FWB 14°FDB 67°FDB, 57°FWB 75°FDB, 65°FWB 80°FDB, 67°FWB 6°FDB, 5°FWB 70°FDB, 60°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4C36NA 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. Indoor units a Max. height difference b Outdoor unit 49 ft. 49 ft. c 49 ft. d 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 Outdoor unit union diameter For Indoor unit A Indoor unit B Indoor unit C Indoor unit D OBH702A 26 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Unit: inch (mm) MXZ-5C42NA R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Union Service port High pressure switch Service port Header(Gas) ĭ1/2 Indoor unit A Compressor shell temperature thermistor RT62 4-way valve ĭ3/8 Indoor unit B Stop valve (with service port) ĭ3/8 Indoor unit C ĭ3/8 2-way solenoid valve Indoor unit D ĭ3/8 Indoor unit E Header(Evaporator) Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Outdoor heat exchanger temperature thermistor RT68 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Union ĭ1/4 Strainer #100 LEV A Capillary tube Indoor unit A ĭ1/4 Strainer #100 Strainer #100 LEV B Indoor unit B Distributor ĭ1/4 Strainer #100 LEV C ĭ1/4 Strainer #100 LEV D ĭ1/4 Strainer #100 LEV E Strainer #50 Stop valve Indoor unit C Indoor unit D Indoor unit E OBH702A 27 Defrost temperature thermistor RT61 Strainer #50 Ambient temperature thermistor RT65 Operating Range Cooling Heating MXZ-5C42NA Maximum Minimum Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 115°FDB 95°FDB, 71°FWB 14°FDB 67°FDB, 57°FWB 75°FDB, 65°FWB 80°FDB, 67°FWB 6°FDB, 5°FWB 70°FDB, 60°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-5C42NA 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. Indoor units a Max. height difference e Outdoor unit 49 ft. b 49 ft. c 49 ft. d 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". Unit : inch Outdoor unit union diameter For Indoor unit A Indoor unit B Indoor unit C Indoor unit D Indoor unit E OBH702A 28 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Unit: inch (mm) MXZ-2C20NAHZ R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Compressor shell temperature thermistor RT62 Service port High pressure switch Union Header(Gas) Service port ĭ3/8 4-way valve Indoor unit A Stop valve (with service port) Header(Evaporator) 2-way solenoid valve ĭ3/8 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) Outdoor heat exchanger temperature thermistor RT68 Indoor unit B Union ĭ1/4 Strainer #100 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) LEV A Indoor unit A Defrost temperature thermistor RT61 Capillary tube Strainer #100 Distributor Strainer #50 Stop valve ĭ1/4 Strainer #100 LEV B Indoor unit B OBH702A 29 Strainer #50 Ambient temperature thermistor RT65 Operating Range Cooling Heating MXZ-2C20NAHZ Maximum Minimum Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 95°FDB, 71°FWB 115°FDB 67°FDB, 57°FWB 14°FDB 80°FDB, 67°FWB 75°FDB, 65°FWB 70°FDB, 60°FWB -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-2C20NAHZ 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. Indoor units a Max. height difference Outdoor unit 49 ft. 49 ft. 49 ft. b 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 Outdoor unit union diameter For Liquid Indoor unit A Gas Liquid Indoor unit B Gas OBH702A 30 1/4 3/8 1/4 3/8 MXZ-3C24NAHZ MXZ-3C30NAHZ R. V. coil OFF ON Unit: inch (mm) Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port Compressor shell temperature thermistor RT62 Oil separator High pressure switch Union Header(Gas) Service port ĭ1/2 Indoor unit A ĭ3/8 Indoor unit B 4-way valve Stop valve (with service port) Header(Evaporator) 2-way solenoid valve ĭ3/8 Indoor unit C Union Strainer ĭ1/4 #100 LEV A Strainer #100 Strainer #100 LEV B Capillary tube Distributor Stop valve Strainer #50 Indoor unit B Strainer ĭ1/4 #100 LEV C Indoor unit C OBH702A Outdoor heat exchanger temperature thermistor RT68 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.8 x 100) Indoor unit A ĭ1/4 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.6 x 1000) 31 Defrost temperature thermistor RT61 Strainer #50 Ambient temperature thermistor RT65 Operating Range Cooling Heating MXZ-3C24NAHZ MXZ-3C30NAHZ Maximum Minimum Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 95°FDB, 71°FWB 115°FDB 67°FDB, 57°FWB 14°FDB 80°FDB, 67°FWB 75°FDB, 65°FWB 70°FDB, 60°FWB -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NAHZ MXZ-3C30NAHZ 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. Indoor units a Max. height difference Outdoor unit c 49 ft. 49 ft. 49 ft. b 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 Outdoor unit union diameter For Indoor unit A Indoor unit B Indoor unit C OBH702A 32 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant 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 circuit. 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. WARNING 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. OBH702A 33 8 DATA Model Indoor type Item Total Capacity SHF Input Electrical Power supply (V, phase, Hz) circuit Input Comp. current (208/230V) Fan motor current Refrigerant Condensing pressure circuit Suction pressure Discharge temperature Condensing temperature Suction temperature Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) Outdoor Intake air temperature DB unit WB Fan speed Airflow Model Indoor type Item Total Capacity SHF Input Electrical Power supply (V, phase, Hz) circuit Input Comp. current (208/230V) Fan motor current Refrigerant Condensing pressure circuit Suction pressure Discharge temperature Condensing temperature Suction temperature Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) Outdoor Intake air temperature DB unit WB Fan speed Airflow OBH702A MXZ-3C24NA kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (06+06+09) Duct (09+09+09) Cooling Heating Cooling Heating 22,000 25,000 23,600 24,600 – – – – 1.62 1.75 2.10 1.90 208/230, 1, 60 1.554 1.684 1.920 1.780 7.47 / 6.76 8.1 / 7.32 9.23 / 8.35 8.56 / 7.74 0.3 0.3 0.3 0.3 395 310 419 345 162 101 138 102 143 137 155 141 116 98 120 106 59 36 50 34 137 128 146 131 ft 25[75] Unit Btu/h – kW – ºF ºF rpm CFM 6lb. 13oz. 95 720 2,287 47 43 750 2,382 95 720 2,287 47 43 750 2,382 MXZ-3C30NA kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (09+09+12) Duct (09+09+12) Cooling Heating Cooling Heating 28,400 28,600 27,400 27,600 – – – – 2.68 2.15 2.84 2.22 208/230, 1, 60 2.614 2.084 2.650 2.090 12.57 / 11.37 10.02 / 9.06 12.74 / 11.52 10.05 / 9.09 0.3 0.3 0.3 0.3 432 323 439 323 137 97 132 99 159 136 165 136 122 101 124 101 49 32 47 32 145 121 156 128 ft 25[75] Unit Btu/h – kW – ºF ºF rpm CFM 6 lb.13 oz. 95 720 2,287 34 47 43 750 2,382 95 720 2,287 47 43 750 2,382 Model Indoor type Item Total Capacity SHF Input Electrical Power supply (V, phase, Hz) circuit Input Comp. current (208/230V) Fan motor current Refrigerant Condensing pressure circuit Suction pressure Discharge temperature Condensing temperature Suction temperature Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) Outdoor Intake air temperature DB unit WB Fan speed Airflow OBH702A MXZ-4C36NA kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (09+09+09+09) Duct (09+09+09+09) Cooling Heating Cooling Heating 35,400 36,000 34,400 34,400 – – – – 3.76 3.02 3.94 3.10 208/230, 1, 60 3.672 2.932 3.700 2.940 17.65 / 15.97 14.1 / 12.75 17.79 / 16.09 14.13 / 12.78 0.3 0.3 0.3 0.3 461 297 470 334 141 89 129 91 172 138 176 147 127 95 129 103 51 28 46 29 162 130 165 139 ft 25[100] Unit Btu/h – kW – ºF ºF rpm CFM 6 lb.13 oz. 95 720 2,287 35 47 43 750 2,382 95 720 2,287 47 43 750 2,382 Model Indoor type Item Capacity Total SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) DB Intake air temperature WB Outdoor unit Fan speed Airflow Model Indoor type Item Capacity SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) DB Intake air temperature WB Outdoor unit Fan speed Airflow Total OBH702A MXZ-5C42NA kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Cooling Heating Cooling Heating 40,500 45,000 37,500 41,000 4.41 3.58 4.17 3.47 208/230, 1, 60 4.300 3.465 3.870 3.270 20.67/18.7 16.66/15.07 18.61/16.83 15.72/14.22 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 466 305 446 326 153 93 137 98 172 155 165 143 127 97 124 102 53 27 47 29 156 138 145 121 ft 25 [80] Unit Btu/h kW ºF ºF rpm CFM 8 lb. 13 oz. 95 630 2,118 47 43 730 2,542 95 630 2,118 47 43 730 2,542 MXZ-2C20NAHZ kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (09+09) Duct (09+12) Cooling Heating Cooling Heating 18,000 22,000 20,000 22,000 1.34 1.62 1.82 1.75 208/230, 1, 60 1.296 1.574 1.670 1.660 6.23/5.63 7.57/6.84 8.03/7.26 7.98/7.22 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 406 341 406 334 154 110 133 113 158 131 148 141 108 105 112 103 60 37 46 37 137 107 127 117 ft 25 [50] Unit Btu/h kW ºF ºF rpm CFM 8 lb. 13 oz. 95 630 2,118 36 47 43 730 2,542 95 630 2,118 47 43 730 2,542 Model Indoor type Item Capacity Total SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) DB Intake air temperature WB Outdoor unit Fan speed Airflow Model Indoor type Item Capacity SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref. pipe length [Total pipe length for multi-system] Refrigerant charge (R410A) DB Intake air temperature WB Outdoor unit Fan speed Airflow Total OBH702A MXZ-3C24NAHZ kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (06+06+09) Duct (09+09+09) Cooling Heating Cooling Heating 22,000 25,000 23,600 24,600 1.63 1.73 2.36 1.88 208/230, 1, 60 1.564 1.661 2.180 1.760 7.52/6.8 7.99/7.22 10.48/9.48 8.46/7.65 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 397 302 377 329 164 106 136 109 144 122 152 127 114 97 115 103 59 42 48 36 128 105 136 109 ft 25 [70] Unit Btu/h kW ºF ºF rpm CFM 8 lb. 13 oz. 95 630 2,118 47 43 730 2,542 95 630 2,118 47 43 730 2,542 MXZ-3C30NAHZ kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (09+09+12) Duct (09+09+12) Cooling Heating Cooling Heating 28,400 28,600 27,400 27,600 2.28 2.10 2.67 2.19 208/230, 1, 60 2.214 2.031 2.480 2.060 10.64/9.63 9.76/8.83 11.92/10.78 9.9/8.96 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 404 321 416 329 146 103 131 107 146 131 153 128 117 101 118 103 52 35 45 35 129 111 135 108 ft 25 [70] Unit Btu/h kW ºF ºF rpm CFM 8 lb. 13 oz. 95 650 2,224 37 47 43 730 2,542 95 650 2,224 47 43 730 2,542 8-1. OPERATING RANGE (1) POWER SUPPLY Model Outdoor unit MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA MXZ-3C24NAHZ MXZ-4C36NA MXZ-3C30NAHZ MXZ-5C42NA Guaranteed Voltage Rating Min. 198 V 208 V 230 V Max. 253 V 208/230 V 60 Hz 1 (2) OPERATION Function Cooling Heating Intake air temperature Condition "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 OBH702A Outdoor Indoor DB (°F) WB (°F) DB (°F) WB (°F) 80 67 95 (75) 80 67 82 (65) 80 67 82 (65) 80 67 67 (53.5) 80 67 87 (69) 70 60 47 43 70 60 17 15 70 60 62 56.5 70 60 47 43 70 60 35 33 70 60 35 33 38 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 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 provided 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 : (2) Indoor outlet air wet-bulb temperature : (3) Outdoor intake air dry-bulb temperature : (4) Total input: °FWB °FWB °FDB W } Cooling } (5) Indoor intake air dry-bulb temperature : °FDB (6) Outdoor intake air wet-bulb temperature : °FWB Heating (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. How to measure the indoor air wet and dry bulb temperature difference 1. 2. 3. 4. 5. 6. 7. 8. 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. 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. Check that the air filter is cleaned. Open windows and doors of room. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE. Compressor starts running at 33 Hz (COOL) or 45 Hz (HEAT). The frequency at each operation mode is fixed. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature. 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 OBH702A 39 8-2. CAPACITY AND THE INPUT CURVES 15.6 7.3 10.5 12.7 12.4 15.8 14.4 6.8 9.6 11.7 11.4 14.5 13.2 6.2 8.8 10.7 10.5 13.2 12.1 5.7 8.0 9.7 9.5 12.0 10.9 5.1 7.2 8.7 8.5 10.7 9.8 4.6 6.5 7.8 7.6 9.5 8.7 09 class (24Hz) 12 class (31Hz) 15 class (35Hz) Cooling capacity (at Rated frequency) 1.5 Capacity correction factors 13.5 17.1 * 24 class (54Hz) 11.3 13.8 18 class (42Hz) 7.9 06 class (19Hz) Indoor unit class (Inverter output frequency) Indoor air Wet-bulb temperature difference (degree) MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 23 32 41 50 59 68 77 86 95 104 72 68 64 113 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency) Input correction factors 1.3 1.2 79 72 68 64 75 1.1 1.0 0.9 Indoor intake air Wet-bulb temperature( F) 0.8 14 23 32 41 50 59 68 77 86 95 Outdoor intake air Dry-bulb temperature (°F) 104 113 1.3 Capacity correction factor 39.8 36.7 33.7 30.2 27.2 24.1 21.4 18.0 15.1 11.9 1.2 ) ure (°F 59 68 779 rat 1.1 1.0 ulb e mp te y-b 0.9 r ir D ea tak r in 0.8 o do In 0.7 0.6 0.5 0.4 5 * 24 class (62Hz) 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 Total input (Heating : at Rated frequency) 1.3 Input correction factor 15 class (43Hz) 53.3 49.1 45.2 40.5 36.5 32.4 29.0 24.1 20.5 16.0 18 class (50Hz) 49.1 45.4 41.6 37.4 33.7 29.9 26.5 22.1 18.7 14.8 44.8 41.4 38.0 34.0 30.6 27.2 24.1 20.2 17.1 13.5 12 class (36Hz) 34.0 31.3 28.8 25.7 23.2 20.7 18.0 15.3 13.0 10.3 09 class (29Hz) 06 class (23Hz) Indoor unit class Indoor air Dry-bulb temperature (Inverter output difference (degree) frequency) Heating capacity (at Rated frequency) 24.3 22.5 20.5 18.5 16.6 14.8 13.0 11.0 9.2 7.4 1.2 1.1 1.0 ulb ry-b 0.9 (°F) pe tem 79 68 59 ta or in Indo 0.8 ir D ke a re ratu 0.7 0.6 0.5 0.4 * MXZ-3C30/4C36NA 5 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 NOTE: The above broken lines are for the heating operation without any frost and defrost operation. OBH702A 40 15.6 7.3 10.5 12.7 12.4 15.8 14.4 6.8 9.6 11.7 11.4 14.5 13.2 6.2 8.8 10.7 10.5 13.2 12.1 5.7 8.0 9.7 9.5 12.0 10.9 5.1 7.2 8.7 8.5 10.7 9.8 4.6 6.5 7.8 7.6 9.5 8.7 09 class (20Hz) 12 class (24Hz) 15 class (26Hz) Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 23 32 41 50 59 68 77 86 95 104 72 68 64 113 Outdoor intake air Dry-bulb temperature(°F) *2 24 *1 18 Cooling capacity (at Rated frequency) 1.5 Capacity correction factors 13.5 17.1 class (42Hz) 11.3 13.8 class (32Hz) 7.9 06 class (18Hz) Indoor unit class (Inverter output frequency) Indoor air Wet-bulb temperature difference (degree) MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Total input (Cooling : at Rated frequency) Input correction factors 1.3 1.2 79 72 68 64 75 1.1 1.0 0.9 Indoor intake air Wet-bulb temperature( F) 0.8 14 23 32 41 50 59 68 77 86 95 Outdoor intake air Dry-bulb temperature (°F) 104 113 Capacity correction factor 1.3 1.2 ) ure (°F 59 68 779 rat 1.1 1.0 ulb e mp te y-b 0.9 r ir D ea tak r in 0.8 o do In 0.7 0.6 0.5 0.4 5 class (44Hz) 39.8 36.7 33.7 30.2 27.2 24.1 21.4 18.0 15.1 11.9 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 Total input (Heating : at Rated frequency) *2 24 class (37Hz) 53.3 49.1 45.2 40.5 36.5 32.4 29.0 24.1 20.5 16.0 1.3 Input correction factor *1 18 49.1 45.4 41.6 37.4 33.7 29.9 26.5 22.1 18.7 14.8 15 class (33Hz) 44.8 41.4 38.0 34.0 30.6 27.2 24.1 20.2 17.1 13.5 12 class (28Hz) 09 class (20Hz) 34.0 31.3 28.8 25.7 23.2 20.7 18.0 15.3 13.0 10.3 06 class (18Hz) Indoor unit class Indoor air Dry-bulb temperature (Inverter output difference (degree) frequency) Heating capacity (at Rated frequency) 24.3 22.5 20.5 18.5 16.6 14.8 13.0 11.0 9.2 7.4 1.2 1.1 1.0 ulb ry-b 0.9 (°F) pe tem 79 68 59 ta or in Indo 0.8 ir D ke a re ratu 0.7 0.6 0.5 0.4 *1 MXZ-5C42NA,MXZ-3C24/30NAHZ *2 MXZ-5C42NA,MXZ-3C30NAHZ 5 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 NOTE: The above broken lines are for the heating operation without any frost and defrost operation. OBH702A 41 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) 1. 06-class unit in single operation <COOL>Total input <COOL>Capacity 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.0 0.5 0.5 0.5 2.0 <HEAT>Total input <HEAT>Capacity 2.5 2.0 1.5 1.0 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 0.5 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 2. 09-class unit in single operation 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency 0 150Hz 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 3. 12-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Total input <HEAT>Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 4. 15-class unit in single operation 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 5. 18-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Total input <HEAT>Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 6. 24-class unit in single operation (MXZ-3C30/4C36NA only) 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency 150 Hz OBH702A 0 50 100 Frequency 150 Hz 0 50 100 Frequency 42 150 Hz 0 50 100 Frequency 150 Hz (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) 1. 06-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Total input <HEAT>Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 2. 09-class unit in single operation 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 3. 12-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Total input <HEAT>Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 4. 15-class unit in single operation 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 5. 18-class unit in single operation (MXZ-5C42NA, MXZ-3C24/30NAHZ only) <COOL>Total input <COOL>Capacity <HEAT>Total input <HEAT>Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 6. 24-class unit in single operation (MXZ-5C42NA, MXZ-3C30NAHZ only) 2.0 <HEAT>Capacity <COOL>Total input <COOL>Capacity <HEAT>Total input 2.0 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0 50 100 Frequency OBH702A 150 Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 43 150 Hz 0 50 100 Frequency 150 Hz 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 24 Hz 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. Outdoor low pressure 150 F re (˚ eratu p m lb te ry-bu D r o Indo 80 140 75 130 70 120 6.0 86 ) Outdoor unit current (A) (PSIG) 160 24 Hz 5.0 4.0 3.0 re (˚F eratu p m e t -bulb r Dry o o d In ) 86 80 75 70 24 Hz 2.0 1.0 110 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.0 65 70 75 80 85 90 95 100 105 110 115 (˚F) Ambient temperature (˚F) Ambient temperature (˚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. Outdoor unit current (A) 7.0 6.0 5.0 4.0 ) (˚F re u t ra pe em t ulb y-b r rD oo Ind 32 Hz 75 70 65 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 44 2. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 24 Hz 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. Outdoor low pressure 150 e (˚F ratur e p m lb te ry-bu D r o Indo 80 140 75 130 70 120 6.0 86 ) Outdoor unit current (A) (PSIG) 160 24 Hz 5.0 4.0 e (˚F ratur e p tem bulb Dryr o o Ind ) 86 80 75 70 24 Hz 3.0 2.0 1.0 0.0 65 70 75 80 85 90 95 100 105 110 115 (˚F) 110 65 70 75 80 85 90 95 100 105 110 115 (˚F) (2) HEAT operation Ambient temperature (˚F) Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 32 Hz. Ambient temperature (˚F) Outdoor unit current (A) 7.0 6.0 5.0 4.0 lb bu ryD r oo Ind ( ure rat e p tem ˚F) 75 70 65 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 45 3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed : High Inverter output frequency : 24 Hz 150 86 (˚F) rature e p m e bulb t r DryIndoo 5.0 80 140 75 130 70 120 6.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 160 <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. 24 Hz b -bul Dry r o Indo F re (˚ ratu e p tem ) 86 80 75 70 4.0 3.0 24 Hz 2.0 1.0 110 0.0 65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F) Ambient temperature (˚F) Ambient temperature (˚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. Outdoor unit current (A) 7.0 6.0 5.0 oor Ind 4.0 e( tur a r pe tem b l -bu Dry ˚F) 75 70 65 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 46 4. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed : High Inverter output frequency : 24 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. 160 6.0 re (˚F eratu p m e t -bulb r Dry Indoo ) 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 4.0 150 80 (˚F ture a r e temp -bulb y r D or Indo 75 86 80 75 70 24 Hz 3.0 140 ) 2.0 130 70 1.0 24 Hz 120 0.0 65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F) Ambient temperature (˚F) Ambient temperature (˚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. Outdoor unit current (A) 7.0 6.0 5.0 oor Ind ( re atu r e p em lb t u b Dry ˚F) 75 70 65 4.0 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 47 5. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed : High Inverter output frequency : 24 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. 160 6.0 F ure (˚ perat m e t -bulb r Dry Indoo ) 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 4.0 150 80 F re (˚ ratu e p tem -bulb y r D or Indo 75 86 80 75 70 24 Hz 3.0 140 ) 2.0 130 70 1.0 24 Hz 120 0.0 65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F) Ambient temperature (˚F) Ambient temperature (˚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. Outdoor unit current (A) 7.0 6.0 5.0 oor Ind e( tur a r pe tem b l -bu Dry ˚F) 75 70 65 4.0 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 48 6. 24-class unit in single operation (OUTDOOR UNIT : MXZ-3C30NA MXZ-4C36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 24 Hz 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. (PSIG) 180 86 6.0 80 160 75 150 140 Outdoor unit current (A) Outdoor low pressure 170 7.0 (˚F) erature p m te lb Dry-bu Indoor 70 5.0 4.0 3.0 F) ˚ re ( ratu e p m lb te y-bu r D or Indo 86 80 75 70 24 Hz 2.0 24 Hz 1.0 130 65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F) Ambient temperature (˚F) Ambient temperature (˚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. Outdoor unit current (A) 7.0 6.0 5.0 4.0 (˚F ure erat p m e ulb t ry-b D r o Indo ) 75 70 65 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) OBH702A 49 7. 06-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) (1) COOL operation 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 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. Air flow speed : High Inverter output frequency : 18 Hz Outdoor low pressure 160 E U'U\ R ,QGR 80 150 75 140 70 86 80 75 70 6.0 86 WX SHUD HP XOEW ) UHÛ Û) H 2XWGRRUXQLWFXUUHQW$ 36,* 170 130 5.0 4.0 XU UDW H PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 4.0 Û) 6.0 75 70 65 ' RRU ,QG SH HP OEW X U\E UH UDWX 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 50 8. 09-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 18 Hz 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. Outdoor low pressure 160 E U'U\ R ,QGR 80 150 75 140 70 86 80 75 70 6.0 86 WX SHUD HP XOEW ) UHÛ Û) H 2XWGRRUXQLWFXUUHQW$ 36,* 170 130 5.0 4.0 XU UDW H PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 4.0 Û) 6.0 75 70 65 ' RRU ,QG SH HP OEW X U\E UH UDWX 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 51 9. 12-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 18 Hz 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. Outdoor low pressure 160 E U'U\ R ,QGR 80 150 75 140 70 86 80 75 70 6.0 86 WX SHUD HP XOEW ) UHÛ Û) H 2XWGRRUXQLWFXUUHQW$ 36,* 170 130 5.0 4.0 XU UDW H PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 4.0 Û) 6.0 75 70 65 ' RRU ,QG SH HP OEW X U\E UH UDWX 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 52 10. 15-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 18 Hz 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 36,* 180 , 80 160 150 75 140 70 86 80 75 70 Û) 2XWGRRUXQLWFXUUHQW$ U' QGRR 86 P OEWH U\EX 170 Outdoor low pressure 6.0 HÛ) WXU SHUD 5.0 4.0 H WXU HUD PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 130 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 4.0 Û) 6.0 SH HP \ 'U RU QGR EW EXO UH UDWX 75 70 65 , 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 53 11. 18-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit. Inverter output frequency : 18 Hz 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. 36,* 180 , 80 160 150 75 140 70 86 80 75 70 Û) 2XWGRRUXQLWFXUUHQW$ U' QGRR 86 P OEWH U\EX 170 Outdoor low pressure 6.0 HÛ) WXU SHUD 5.0 4.0 H WXU HUD PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 130 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 4.0 Û) 6.0 SH HP \ 'U RU QGR EW EXO UH UDWX 75 70 65 , 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 54 12. 24-class unit in single operation (OUTDOOR UNIT : MXZ-5C42NA MXZ-3C30NAHZ) (1) COOL operation Data is based on the condition of indoor humidity 50% <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5. To cancel this operation, press emergency run ON/OFF button or any button on remote controller. Air flow speed : High Inverter output frequency : 18 Hz 190 Outdoor low pressure 6.0 HÛ) WXU SHUD E U'U\ R ,QGR 180 80 170 75 160 70 150 140 Û) 86 80 75 70 H 86 HP XOEW 2XWGRRUXQLWFXUUHQW$ 36,* 200 5.0 4.0 XU UDW H PS WH XOE \E 'U RU QGR , 18 Hz 3.0 2.0 1.0 18 Hz 130 65 70 75 80 85 90 95 100 105 110 115 Û) 0.0 65 70 75 80 85 90 95 100 105 110 115 Û) $PELHQWWHPSHUDWXUHÛ) $PELHQWWHPSHUDWXUHÛ) (2) HEAT operation Data is based on the condition of outdoor humidity 75%. Set air flow to High speed. Inverter output frequency is 20 Hz. 2XWGRRUXQLWFXUUHQW$ 7.0 5.0 Û) 6.0 SH HP \ 'U RU QGR EW EXO UH UDWX , 75 70 65 4.0 20 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 Û) $PELHQWWHPSHUDWXUHÛ) OBH702A 55 9 ACTUATOR CONTROL MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Relation between main sensor and actuator Actuator 2-way solenoid valve Sensor Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Capacity code OBH702A Purpose Protection Cooling: Coil frost prevention Heating: High pressure protection Heating: Defrosting Protection Control/Protection Compressor LEV ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Outdoor fan motor 4-way valve (MXZ-5C42VA (MXZ-2C20NAHZ MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ) MXZ-3C30NAHZ) ○ ○ ○ ○ ○ ○ ○ ○ Heating: Defrosting (Heater) Cooling: Control/ Protection Control Defrost heater ○ ○ ○ ○ 56 ○ ○ 10 SERVICE FUNCTIONS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 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. Outdoor control P.C. board LED SW871 Turn ON the power supply for the air conditioner. NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF. OBH702A 57 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. LED indication during detection: LED1 (Red) LED2 (Yellow) LED3 (Green) Lighted Once Lighted LED indication after detection: Indication LED1 (Red) LED2 (Yellow) LED3 (Green) Not lighted Lighted Completed (Problem corrected/ nomal) Lighted Once Once Not completed (Detection failed) Once 5HIHUWR6$)(7<35(&$87,216:+(1/(')/$6+(6 Other indications located behind the service panel. Make sure that the valves are open and the pipes are not collapsed or clogged. 6. Press the switch to cancel. LED indication after cancel : LED1 (Red) LED2 (Yellow) LED3 (Green) Lighted Not lighted Lighted 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. The record of auto line correcting can be confirmed in the following way: 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: LED1 (Red) Once 3 times Number of blinks Wiring line LED2 (Yellow) LED3 (Green) Once Lighted Not corrected 3 times Lighted Corrected 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"). OBH702A 58 11 TROUBLESHOOTING MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 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 confirming 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. <Incorrect> <Correct> Lead wiring Connector housing 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. 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. OBH702A 59 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 3 1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. 3 Refer to the service manual of indoor unit. With the remote controller headed towards the indoor unit, press the TEM1 PERATURE buttons to adjust the set temperature to 77°F (25°C). 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 emitted at the same timing as the blinking of the OPERATION INDICATOR lamp. 2 No (OFF) Yes (Blinks) 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 two consecutive blinking cycles. 2 The outdoor unit is normal. Release the failure mode recall function. Release the failure mode recall function. 3 3 Repair the failure parts. Delete the memorized abnormal condition. Release the failure mode recall function. 3 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. 2.Blinking pattern when outdoor unit is abnormal: 2.5-second OFF 3-second ON Blinking at 0.5second interval 2.5-second OFF 3-second ON Blinking at 0.5second interval ON OFF No beep Repeated cycle OBH702A No beep Repeated cycle Beeps 60 Beeps Repeated cycle 3. Outdoor unit failure mode table The left lamp of OPERATION INDICATOR lamp (Indoor unit) OFF 2-time flash 3-time flash 4-time flash 5-time flash 6-time flash 7-time flash LED indication (Outdoor P.C. Condition board) LED 1 LED 2 None (Normal) Lighted Lighted 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. Discharge temperature thermistor Lighted Once A thermistor shorts or opens during Defrost thermistor Lighted Once compressor running. Ambient temperature thermistor Lighted Twice Fin temperature thermistor Lighted 3 times P.C. board temperature thermis- Lighted 4 times tor Outdoor heat exchanger tem- Lighted 9 times perature thermistor 21 A (MXZ-3C24/3C30/4C36NA)/28 A (MXZOvercurrent Once Not lighted 5C42NA,2C20/3C24/3C30NAHZ) current flows into power module. Abnormal point (Failure mode/protection) Discharge temperature High pressure Fin temperature P.C. board temperature 8-time flash Outdoor fan motor 9-time flash Outdoor control system 10-time flash Low discharge temperature protection 11-time flash Communication error between P.C. boards Current sensor Zero cross detecting circuit Converter Bus-bar voltage 15-time flash LEV and drain pump Remedy • Check the connection of the compressor connecting wire. • Refer to 11-6. "How to check inverter/compressor". • Check the stop valve. • Refer to 11-6. "Check of outdoor thermistors". • Replace the outdoor control P.C. board. • Refer to 11-6. "Check of outdoor thermistors". • Reconnect compressor connector. "How to check in• Refer to 11-6. verter/compressor". • Check the stop valve. Lighted Lighted The discharge temperature exceeds 240.8 °F • Check refrigerant circuit and refrigduring operation. erant amount. Compressor can restart if discharge tempera- • Refer to 11-6. "Check of LEV". ture thermistor reads 212 °F or less 3 minutes later. Lighted Lighted The outdoor heat exchanger temperature ex- • Check refrigerant circuit and refrigceeds 158°F during cooling or the indoor gas erant amount. pipe temperature exceeds 158 °F during heating. • Check the stop valve. The fin temperature exceeds 192 °F during 3 times Not • Check around outdoor unit. lighted operation. • Check outdoor unit air passage. The P.C. board temperature exceeds 189 °F • Refer to 11-6. "Check of outdoor 4 times Not fan motor". lighted during operation. Lighted Lighted A failure occurs 3 consecutive times within 30 seconds after the fan gets started. Lighted 5 times Nonvolatile memory data cannot be read properly. 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. Lighted 6 times Communication error occurs between the outdoor control P.C. board and outdoor power P.C. board for more than 10 seconds. The communication between boards protection cut-out operates 2 consecutive times. Lighted 7 times A short or open circuit is detected in the current sensor during compressor operating. Current sensor protection cut-out operates 2 consecutive times. 5 times Not Zero cross signal cannot be detected while the lighted compressor is operating. The protection cut-out of the zero cross detecting circuit operates 10 consecutive times. 5 times Not A failure is detected in the operation of the lighted converter during operation. • Refer to 11-6. "Check of outdoor fan motor". • Replace the outdoor control P.C. board. • Check refrigerant circuit and refrigerant amount. • Refer to 11-6. "Check of LEV". • Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board. • Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board. • Check the voltage of power supply. • Replace the outdoor power P.C. board. 6 times Not The bus-bar voltage exceeds 400 V or falls to • Check the voltage of power supply. lighted low level during compressor operating. • Replace the outdoor control P.C. board. Lighted Lighted The indoor unit detects an abnormality in • Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor the LEV and drain pump. unit. 61 ○ ○ — — — — — ○ — — ○ — — NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.). OBH702A Indoor/ outdoor unit failure mode recall function ○ — ○ — — 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. Operation start Check the outdoor unit LED indicator. LED 1 or LED 2 has blinked. Both LED 1 and Both LED1 and LED 2 are lighting. LED2 are OFF. Refer to 11-4. "Troubleshooting check table". 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". OBH702A :KHQFRROLQJKHDW exchanger of non-operating indoor unit frosts. :KHQKHDWLQJQRQ operating indoor unit gets warm. Refer to 11-6. "Check of LEV". :KHQFRROLQJ dew drops in the non-operating indoor unit. Check of miss-piping. 62 :KHQKHDWLQJ room does not get warm. Refer to 11-6. "How to check inverter/compressor". &KHFNPLVSLSLQJ shortage of capacity. :KHQFRROLQJ room is not cool. Refer to 11-6. "How to check inverter/ compressor". 11-4. TROUBLESHOOTING CHECK TABLE No. Symptom 1 Outdoor unit does not operate. 2 Indication Abnormal point / Condition LED1(Red) LED2(Yellow) Lighted Once Lighted Twice Lighted 3 times Lighted 4 times 3 4 5 6 7 Lighted 5 times Lighted 7 times Lighted 8 times 8 9 10 11 12 13 'Outdoor unit stops and restarts 3 minutes later' is 14 repeated. Lighted 11 times Lighted 12 times Zero cross detecting circuit Lighted 13 times Current sensor Lighted 14 times Voltage sensor Lighted 15 times Relay operation Twice Not lighted 3 times Not lighted 4 times Not lighted 5 times Not lighted 6 times Not lighted 8 times Not lighted 9 times Not lighted 11 times Not lighted 15 16 17 18 19 20 OBH702A Condition The indoor unit detects an abnormality in the LEV LEV and drain pump and drain pump. Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor Outdoor power gets started, or converter protection cut-out or bussystem bar voltage protection cut-out operates 3 consecutive times within 3 minutes after start-up. A short circuit is detected in the thermistor during Discharge temperature operation, or an open circuit is detected in the thermistor thermistor after 10 minutes of compressor start-up. Fin temperature thermistor A short or open circuit is detected in the thermistor during operation. P. C. board temperature thermistor Ambient temperature A short or open circuit is detected in the thermistor thermistor during operation. A short circuit is detected in the thermistor during Outdoor heat exoperation, or an open circuit is detected in the changer temperature thermistor after 5 minutes (in cooling) and 10 thermistor minutes (in heating) of compressor start-up. A short circuit is detected in the thermistor during Defrost thermistor operation, or an open circuit is detected in the thermistor after 5 minutes of compressor start-up. The nonvolatile memory data cannot be read Outdoor control system properly. Current sensor protection cut-out operates 2 conCurrent sensor secutive times. Communication error The communication protection cut-out between between P.C. boards boards operates 2 consecutive times. M-NET communication M-NET adapter P.C. board detects an abnormality error in the communication error. The protection cut-out of the zero cross detecting circuit operates 10 consecutive times. A short or open circuit is detected in the input current detection circuit during operation. A short or open circuit is detected in the input voltage detection circuit during operation. No relay operation is detected during operation. Overcurrent is detected after 30 seconds of compressor start-up. Remedy • Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor unit. • Check the connection of the compressor connecting wire. • Refer to 11-6. "How to check inverter/compressor". • Check the stop valve. • Refer to 11-6. "Check of outdoor thermistors". • Refer to 11-6. "Check of outdoor thermistors". • Replace the outdoor control P.C. board. • Refer to 11-6. "Check of outdoor thermistors". • Replace the outdoor control P.C. board. • Replace the outdoor power P.C. board. • Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board. • Check the connecting wire between M-NET adapter P.C. board and outdoor control P.C. board, or terminal bed. • Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board. • Replace the outdoor power P.C. board. • Replace the outdoor power P.C. board. • Replace the outdoor power P.C. board. • Reconnect compressor connector. IPM protection • Refer to 11-6. "How to check inverter/ compressor". Overcurrent is detected within 30 seconds of com- • Check the stop valve. Lock protection pressor start-up. • Check the power module (PAM module). The discharge temperature exceeds 240.8 °F durDischarge temperature ing operation. • Check the amount of gas and refrigerant circuit. protection Compressor can restart if discharge temperature • Refer to 11-6. "Check of LEV". thermistor reads 212 °F or less 3 minutes later. Fin temperature The fin temperature exceeds during operation. protection •Check refrigerant circuit and refrigerant amount. P.C. board temperature The P.C. board temperature exceeds during opera- •Refer to 11-6. "Check of outdoor fan motor". protection tion. High-pressure is detected with the high-pressure switch (HPS) during operation. High-pressure • Check around of gas and the refrigerant circuit. The outdoor heat exchanger temperature exceeds • Check the stop valve. protection 158 °F during cooling or the indoor gas pipe temperature exceeds 158 °F during heating. • Reconnect compressor connector. • Refer to 11-6. "How to check inverter/ Pre-heating protection Overcurrent is detected during pre-heating. compressor". • Check the power module. A failure is detected in the operation of the convertConverter protection • Replace the outdoor power P.C. board. er during operation. • Check the voltage of power supply. Bus-bar voltage The bus-bar voltage exceeds 400 V or falls to low • Replace the outdoor power P.C. board or the outprotection level during compressor operating. door control P.C. board. • Refer to 11-6. "Check of bus-bar voltage". Low out side temperaThe ambient became 10.4°F or less. ture protection(cooling) The ambient became 1.4°F or less. (MXZ-3C24NA, — Low out side tempera- MXZ-3C30NA, MXZ-4C36NA, MXZ-5C42NA) ture protection(Heating) The ambient became -18°F or less. (MXZ-2C20 NAHZ, MXZ-3C24NAHZ, MXZ-3C30NAHZ) 63 No. Symptom 21 'Outdoor unit stops and 22 restarts 3 minutes later' is 23 repeated. 24 25 Outdoor unit operates. 26 Indication Abnormal point / Condition LED1(Red) LED2(Yellow) 13 times Not lighted Lighted 8 times Lighted 11 times Lighted 12 times Once Lighted Twice Lighted 3 times Lighted 4 times Lighted 27 28 Outdoor fan motor A failure occurs 3 consecutive times within 30 seconds after the fan gets started. A short or open circuit is detected in the current sensor during compressor operating. Communication error occurs between the outdoor control P.C. board and outdoor power P.C. board for more than 10 seconds. Zero cross signal cannot be detected while the compressor is operating. Current sensor protection Communication between P.C. boards protection Zero cross detecting circuit protection Primary current protecThe input current exceeds 15 A. tion High-pressure protec- The indoor gas pipe temperature exceeds 113 °F tion during heating. The indoor gas pipe temperature falls 37.4 °F or Defrosting in cooling below during cooling. The frequency of the compressor is kept 80 Hz or Discharge temperature more and the discharge temperature is kept under protection 122 °F(COOL mode)/104 °F(HEAT mode) for more than 40 minutes. The frequency of the compressor is kept 80 Hz or Low discharge more and the discharge temperature is kept under temperature protection 102.2 °F for more than 20 minutes. 29 30 Outdoor unit 31 operates normally. Condition 5 times Lighted Cooling high-pressure protection 9 times Lighted Inverter check mode Lighted Lighted Normal Remedy • Refer to 11-6. "Check of outdoor fan motor". • Replace the outdoor power P.C. board. • Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board. • Check the connecting wire among outdoor control P.C. board and outdoor power P.C. board. These symptoms do not mean any abnormality of the product, but check the following points. • Check if indoor filters are clogged. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. • Check refrigerant circuit and refrigerant amount. • Refer to 11-6. "Check of LEV". • Refer to 11-6. "Check of outdoor thermistors". • Refer to 11-6. "Check of LEV". • Check refrigerant circuit and refrigerant amount. This symptom does not mean any abnormality of the product, but check the following points. The outdoor heat exchanger temperature exceeds • Check if indoor filters are clogged. 136.4 °F during operation. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. The unit is operated with emergency operation — switch. — — 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”. 0.5-second ON 0.5-second ON Outdoor control P.C. board (Parts side) ON OFF LED1 LED2 2.5-second OFF OBH702A 2.5-second OFF Lighted 64 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Part name Defrost thermistor (RT61) Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Compressor W RED V WHT Check method and criterion 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. Measure the resistance between terminals using a tester. (Winding temperature: 14°F ~ 104°F) Normal (Each phase) MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA a U BLK Measure the resistance between terminals using a tester. (Winding temperature: 14°F ~ 104°F) Normal (Each phase) MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ a 5HIHUWR Outdoor fan motor Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Normal (Each phase) MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA NaN R.V. coil Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Normal (Each phase) MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ NaN 2-way valve solenoid coil MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Normal MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Linear expansion valve Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Color of lead wire Normal WHT - RED RED - ORN 37.4 ~ 53. YLW - RED RED - BLU NaN WHT LEV RED ORN YLW BLU High pressure switch (HPS) Defrost heater MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702A HPS Pressure 537 ± 22 PSIG 7 PSIG +- 15 Normal Close Open Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Normal 0.35Na 0.50N 65 11-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. Check of power supply Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 208/230 VAC in the power supply terminal block? No Check the power supply cable. Yes Is the output voltage from the outdoor power P.C. board 294/325 VDC? Yes Replace the outdoor control P.C. board. No Turn OFF the power supply and recconnect the reactor. Is the reactor short-circuited? No Replace the reactor. Yes Replace the outdoor power P.C. board. OBH702A 66 • 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. How to check miswiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. LED indication for communication status Communication status is indicated by the LED. Unit status 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. No Is there rated voltage in the power supply? Check the power supply. Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? No Check the wiring. Yes Outdoor control P.C. board Press EMERGENCY OPERATION switch once. LED1 LED2 LED3 Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Blinking Pattern 1 2 3 LED 1 LED 2 LED 3 Unit A status Unit C status Unit E status Unit B status Unit D status Lighted Not lighted No Yes Is serial signal error indicated 6 minutes later? Blinking No Yes Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? Yes Correct them. No A Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1 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. Turn ON the power supply. Does the LED on the outdoor control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? No (Lighted or not lighted) Yes A · Turn OFF inverter-controlled lighting equipment. · Turn OFF the power supply and then turn ON again. · Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B OBH702A · Reinstall either the unit or the light away No from each other. · Attach a filter on remote control receiving section of the indoor unit. 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> Replace the outdoor control P.C. board. 2 2 Be careful of the residual voltage of smoothing capacitor. No Yes Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage> No 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? Yes No Replace the indoor electronic control P.C. board. Be sure to release the failure-mode recall function after checking. Refer to indoor unit service manual. 67 Yes Replace the indoor/outdoor connecting wire. The cooling operation or heating operation does not operate. Check of R.V. coil :KHQFRROLQJRSHUDWLRQGRHVQRWZRUN 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 pin 1 and pin 2 at connector CN712? No Is there voltage 208/230 VAC between the pin 1 and pin 3 at connector CNAC? Yes Yes Turn OFF the power supply. Disconnect the connector CNAC2. Is there normal resistance No to R.V. coil? (Refer to 11-5.) Replace the outdoor control P.C. board. Replace the R.V. coil. Yes Replace the 4-way valve. :KHQKHDWLQJRSHUDWLRQGRHVQRWZRUN 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 pin 2 at connector CN712? No Replace the 4-way valve. Yes Replace the outdoor control P.C. board. OBH702A 68 No CNAC CN712 Outdoor control P.C. board CNAC2 Outdoor power P.C. board Replace the outdoor power P.C. board. • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. Check of LEV Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Yes Is "click - click" sound heard? Or, do you feel vibration of LEV coil with your hand? CN791 CN792 CN793 CN794 CN795 Outdoor control P.C. board Normal No 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.) Yes Replace the outdoor control P.C. board. No Replace LEV coil. OBH702A 69 • When heating, room does not get warm. • When cooling, room does not get cool. How to check inverter/compressor 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. 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? $IWHUWKHRXWGRRUIDQVWDUWVUXQQLQJZDLWIRUPLQXWH or more before measuring the voltage. 7KHRXWSXWYROWDJHYDOXHVKDYHWKHWROHUDQFHRI 7KHRXWSXWGLIIHUVGHSHQGLQJRQWKHFDSDFLW\RUWKH number of indoor units to be operated. No Yes Is output balanced? No Yes Is the input voltage to the outdoor control P.C. board 370 V or more? No Replace the outdoor power P.C. board. Yes 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.) Yes No Reconnect the lead wire of compressor, and turn ON the power supply to indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION. 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 OBH702A 70 Replace the compressor. • When thermistor is abnormal. Check of outdoor thermistors Disconnect 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.) Abnormal Replace the thermistor except RT64. In case that RT64 is abnormal, replace the outdoor power P.C. board since RT64 is combined with the outdoor power P.C. board. No Replace the outdoor control P.C. board or the outdoor power P.C. board. Normal 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. Does the unit operate 10 minutes or more without showing thermistor abnormality? Yes Normal Thermistor Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temperature OBH702A 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 71 Board Outdoor control P.C. board Outdoor power P.C. board • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor Disconnect CNF1 and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to right table) CNF1 No Replace the outdoor fan motor. No Replace the outdoor fan motor. Yes Voltage CNF1 Turn on the power supply to start operation and measure the voltage of connector CNF1. pin 1 - pin 4 294/325 VDC pin 5 - pin 4 15 VDC pin 6 - pin 4 1 - 5 VDC pin 5 - pin 4 N pin 6 - pin 4 N pin 7 - pin 4 * To measure the resistance, connect the negative (-) end of the tester to pin 4. * To measure the voltage, connect the negative (-) end of the tester to pin 4. * Voltage between pin 4 and 6 should be measured within 1 minute after the operation starts. Is the voltage of connector CNF1 normal? (Refer to right table.) No Replace the outdoor control P.C. board. Yes 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 voltage between pin 7 and pin 4 of connector CNF1 repeat 0V and 5V? No Replace the outdoor fan motor. Yes Start operation. Does the fan motor operate for about 5 seconds? No Replace the outdoor fan motor. Yes Replace the outdoor control P.C. board. OBH702A Resistance pin 1 - pin 4 Yes Does the outdoor fan motor rotate smoothly? Measuring points Outdoor control P.C. board 72 • When the operation frequency does not go up from the lowest frequency. Check of HPS CN63H Outdoor control P.C. board 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. Infinity Check the resistance between each terminal. Replace HPS. 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? Yes Replace the outdoor control P.C. board. No Normal The other cases Indoor unit does not operate. (different operating models in multi system) • When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal to the outdoor units first 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 flows into the indoor unit even while it is not operating. Check of bus-bar voltage •Check the voltage of power supply. •Confirm outdoor unit failure mode recall function. (Refer to 11-2.2.) Confirm LED1 indication lamp on the outdoor control P.C. board. Blink 5 times Lighting Replace the outdoor power P.C. board. Replace the outdoor control P.C. board. Turn ON power supply. Start operation. Turn ON power supply. Start operation. Confirm LED1 indication lamp on the outdoor control P.C. board. Blink 9 times Lighting Normal Lighting Replace the outdoor control P.C. board. Replace the outdoor power P.C. board. Turn OFF power supply before removing P.C. board. OBH702A Confirm LED1 indication lamp on the outdoor control P.C. board. Blink 9 times 73 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 11-7. TEST POINT DIAGRAM AND VOLTAGE 1. Outdoor control P.C. board Serial signal 12 ~ 24 V MXZ-3C24NA MXZ-3C30NA 230 VDC Room A Room B Room C Room D Room E MXZ-4C36NA MXZ-5C42NA Input MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ CN601 ) 100 5HVLVWDQFHN CN611 CN741 Signal translation (To Communication adaptor board) 90 CN621 80 70 60 50 40 30 20 10 0 -20 -4 -10 14 0 32 10 50 20 68 30 86 40 (ºC) 104 (ºF) Temperature Thermistor R25 = 10 k ± 2% B constant = 3950 ± 2% 1 )} Rt = 10exp{3950( 1 273+t 298 t : ºC = (ºF - 32)/1.8 CN930 To fan motor F711 FUSE T3.15AL250V CNAC to outdoor power P.C. board 208/230 VAC Input CN714 Base heater 208/230 VAC Input Bus-bur voltage 290 ~ 370 VDC 15 VDC Rotate instruction (Constant voltage) Rotate signal (Pulse wave) CN713 Valve coil 208/230 VAC Input CNDC Bus-bur voltage 290 ~ 370 VDC CN712 R.V. coil 208/230 VAC Input CNTH2 Ambient temperature thermistor (RT65) CNTH1 Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Defrost thermistor (RT61) CN63H High pressure switch SW1 SW871 ( LEV: 12 VDC pulse wave LED3 LED2 LED1 Discharge temperature thermistor (RT62) 700 600 5HVLVWDQFHN CN795 LEV Room E CN794 LEV Room D CN793 LEV Room C CN792 LEV Room B CN791 LEV Room A (-) (+) CN701 Signal transmission (To power board) 5 VDC pulse wave 15 V: MXZ-3C24/3C30/ 4C36NA 18 V: MXZ-5C42NA, MXZ-2C20/3C24/ 3C30NAHZ CN702 Signal (+) transmission V (-) (To power board) 5 VDC pulse wave 15(-) V (-) SW872 SW2 500 400 300 200 100 0 0 32 OBH702A 74 10 50 20 68 30 86 40 50 60 70 80 90 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 = 13.36 k ± 2% B constant = 4014 ± 2% 1 )} Rt = 13.36exp{4014( 1 273+t 373 t : ºC = (ºF - 32)/1.8 2. Outdoor power P.C. board Output to drive compressor (+) 15 V (-) (-) 15 V CN151 Signal transmission (To Outdoor control P.C. board) 5 VDC pulse wave MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA CN171 Fin temperature thermistor (RT64) (-) CN152 (+) Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave Connect to earth CNAC2 208/230 VAC Output F1 FUSE T6.3AL250V 208/230 VAC Input F2 FUSE T6.3AL250V CNAC1 208/230 V Output Connect to reactor (Red line) Connect to reactor (White line) CNDC Bus-bur voltage 290 - 370 VDC Fin temperature thermistor (RT64) 200 5HVLVWDQFHN 180 160 140 120 100 80 60 40 20 0 0 10 20 30 40 50 60 70 80 & 32 50 68 86 104 122 140 158 176 ) Temperature Thermistor R50 = 17 k ± 2% B constant = 4150 ± 3% 1 1 5W H[S^` 273+t 323 t : ºC = (º) OBH702A 75 Connect to earth 2. Outdoor power P.C. board Output to drive compressor (+) 18 V (-) (-) 15 V 15 V CN171 Fin temperature thermistor (RT64) CN151 Signal transmission (To Outdoor control P.C. board) 5 VDC pulse wave MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ CNDC Bus-bur voltage 290 - 370 VDCCNAC1 Connect to earth 208/230 V Output F1 FUSE T6.3AL250V CN152 Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave (+) (-) F2 FUSE T6.3AL250V Connect to earth Connect to reactor Connect to reactor (White line) (Red line) Connect to earth Fin temperature thermistor (RT64) 200 5HVLVWDQFHN 180 160 140 120 100 80 60 40 20 0 0 10 20 30 40 50 60 70 80 & 32 50 68 86 104 122 140 158 176 ) Temperature Thermistor R50 = 17 k ± 2% B constant = 4150 ± 3% 1 1 5W H[S^` 273+t 323 t : ºC = (º) OBH702A 76 CNAC2 208/230 VAC Output 208/230 VAC Input 12 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two 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. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. Sleeve Slide the sleeve. Pull the terminal while pushing the locking lever. Locking lever Hold the sleeve, and pull out the terminal slowly. Connector 12-1. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA Photos : MXZ-4C36NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 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 connecting 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. Screws of the top panel Photo 3 Catch of the front panel Catch of the front panel Screws of the front panel Screws of the service panel Photo 2 Screws of the front panel Screws of the back panel OBH702A 77 Screws of the top panel OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reactor and the outdoor power P.C. board Photo 4 Catches of the PB cover (1) Remove the top panel and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting 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. Screws of the electrical parts Photo 6 Photo 5 Screws of the reactor Screws of the outdoor control P.C. board holder OBH702A 78 OPERATING PROCEDURE PHOTOS 3. 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 connecting wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. Photo 7 Propeller fan Screws of the outdoor fan motor Photo 8 4. Removing the compressor and 4-way valve 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 connecting 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 kg/cm2 (0 MPa). (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. OBH702A 79 R.V. coil Brazed parts OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve Photo 9 (1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (Gas recovery is not required if the unit is pumped down.) Discharge pipe (3) Remove the LEV coils. brazed part (4) Detach the brazed parts of the expansion valves and pipes. Expansion valves Suction pipe brazed part Compressor nuts OBH702A 80 Expansion valves LEV coils 12-2. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Photos : MXZ-3C30NAHZ NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 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 connecting 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. Screws of the top panel Photo 3 Screws of the front panel Photo 2 Screw of the back panel Screws of the front panel Screws of the back panel OBH702A 81 Screws of the service panel Screws of the top panel OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reactor 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 connecting 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 outdoor 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. Photo 7 Screw of the electrical parts Photo 4 Screws of the electrical parts Photo 5 Screws of the outdoor control P.C. board Photo 6 Screws of the TB support Screws of the control box F Photo 8 Screws of the reactor Screws of the control box separator OBH702A 82 Screws of the outdoor power P.C. board OPERATING PROCEDURE PHOTOS 3. 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 connecting wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. Photo 9 Screws of the outdoor fan motor Screw of the VB fixture Propeller fan Screws of the outdoor fan motor VB fixture Separator 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 connecting 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 kg/cm2 (0 MPa). (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), CN791, CN792, CN793 (MXZ-5C42NA, MXZ-3C24/30NAHZ), CN794 (MXZ-5C42NA), CN795 (MXZ-5C42NA) (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. OBH702A 83 Sound proof felt Photo 10 R.V. coil 4-way valve Brazed parts OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve (1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting 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. Photo 11 Discharge pipe brazed part Compressor nuts Suction pipe brazed part LEV coils Expansion valves HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct. 2014. No. OBH702 REVISED EDITION-A Distributed in Sep. 2014. No. OBH702 Made in Japan OBH702A 84 New publication, effective Oct. 2014 Specifications are subject to change without notice.