Download Mitsubishi Electric MUZ-FD NA Service manual
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Revision C: • MXZ-3B30NA has been added. Please void OBH560 REVISED EDITION-B. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL HFC utilized No. OBH560 REVISED EDITION-C R410A Models MXZ-2B20NA, MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 1 Indoor unit service manual MSZ-A·NA Series (OB450) MSZ-FD·NA Series (OBH497) MSZ-FE·NA Series (OBH542) MSZ-GE·NA Series (OBH548) MFZ-KA·NA Series(OBH568) SEZ-KD·NA.TH Series CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 2 3. SPECIFICATION ················································ 3 4. NOISE CRITERIA CURVES ······························ 7 5. OUTLINES AND DIMENSIONS ························ 8 6. WIRING DIAGRAM···········································11 7. REFRIGERANT SYSTEM DIAGRAM ············· 13 8. DATA ································································ 19 9. ACTUATOR CONTROL··································· 37 10. SERVICE FUNCTIONS···································· 37 11. TROUBLESHOOTING ····································· 39 12. DISASSEMBLY INSTRUCTIONS ···················· 57 INDOOR UNITS COMBINATION SHEETS MXZ-2B20NA PARTS CATALOG (OBB560) The Slim Line. From Mitsubishi Electric. TM 9700058 33223 Revision A: • MXZ-2B20NA- 1 has been added. Revision B: • MXZ-3B24NA and MXZ-4B36NA have been added. Revision C: • MXZ-3B30NA has been added. 1 TECHNICAL CHANGES MXZ-2B20NA New model MXZ-2B20NA MXZ-2B20NA - 1 1. Outdoor fan motor has been changed. 2. Outdoor electronic control P.C. board has been changed. 3. LEV coil has been changed. MXZ-3B24NA New model MXZ-3B30NA New model 2 PART NAMES AND FUNCTIONS MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-2B20NA Air inlet (Back and side) Air inlet (Back and side) Air outlet Air outlet Drain outlet Drain outlet 2 3 SPECIFICATION Outdoor model Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating MXZ-2B20NA Indoor type Btu/h Btu/h Btu/h W W W Non-Duct (09+09) Duct (09+12) 18,000 20,000 22,000 22,000 14,500 12,500 1,440 2,190 1,650 1,780 1,500 1,430 12.50 9.10 18.0 15.5 8.9 (7.0) 8.5 (6.9) 3.91 3.62 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 20 15 0.96 SNB130FQBH1 U-V 0.98 V-W 0.98 W-U 0.98 10.1 15 LEV 49/51 Reverse cycle 33-1/16 13 27-15/16 130 Wireless type 12-24 V DC Not supplied (optional parts) 1/4 A,B: 3/8 Flared Flared 5 lb. 15 oz. 23.7 (NEO22) EER SEER HSPF IV (V) COP External finish V, phase, Hz Power supply Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance (at 68°F) Ω Compressor R.L.A L.R.A Refrigerant control dB(A) Sound level Defrost method W in. D in. Dimensions H in. lb. Weight Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor lb. Refrigerant charge (R410A) oz. Refrigeration oil (Model) 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 3 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 Outdoor model Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating 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 (at 68°F) Ω 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 in. Liquid Valve size in. Gas Indoor Connection method Outdoor lb. Refrigerant charge (R410A) oz. Refrigeration oil (Model) MXZ-3B24NA Non-Duct (06+06+09) Duct (09+09+09) 22,000 23,600 25,000 24,600 18,800 17,000 1,760 2,460 1,750 1,900 2,120 2,230 12.50 9.60 17.5 15.0 9.3 (7.0) 8.5 (6.9) 4.20 3.80 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 20 15 0.93 TNB220FMCH U-V 0.61 V-W 0.61 W-U 0.61 11 15 LEV 54/49 Reverse cycle 35-7/16 12-19/32 35-7/16 150 Wireless type 12-24 V DC Not supplied (optional parts) 1/4 A: 1/2 B,C: 3/8 Flared Flared 7 lb. 11 oz. 29.4 (NEO22) 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 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 Outdoor model Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating 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 (at 68°F) Ω 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 in. Liquid Valve size in. Gas Indoor Connection method Outdoor lb. Refrigerant charge (R410A) oz. Refrigeration oil (Model) MXZ-3B30NA Non-Duct (06+06+09) Duct (09+09+09) 28,400 27,400 28,600 27,600 18,800 18,000 3,120 3,330 2,150 2,220 2,120 2,140 9.10 8.23 17.5 14.5 10.5 (7.2) 9.5 (7.0) 3.90 3.64 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 20 15 0.93 TNB220FMCH U-V 0.61 V-W 0.61 W-U 0.61 11 15 LEV 49/49 Reverse cycle 35-7/16 12-19/32 35-7/16 150 Wireless type 12-24 V DC Not supplied (optional parts) 1/4 A: 1/2 B,C: 3/8 Flared Flared 7 lb. 11 oz. 29.4 (NEO22) 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 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 Outdoor model Item Cooling Capacity Power consumption Indoor type Btu/h Heating 47 Btu/h Heating 17 Cooling Btu/h W Heating 47 W W Heating 17 EER Cooling SEER Cooling HSPF IV (V) Heating COP Heating External finish V, phase, Hz Power supply A Max. fuse size (time delay) A Min. circuit ampacity F.L.A Fan motor Model Winding resistance (at 68°F) Ω Compressor R.L.A L.R.A Refrigerant control dB(A) Sound level Defrost method W in. D in. Dimensions H in. lb. Weight Remote controller Control voltage (by built-in transformer) Refrigerant piping Liquid in. Valve size Gas in. Indoor Connection method Outdoor lb. Refrigerant charge (R410A) oz. Refrigeration oil (Model) MXZ-4B36NA Non-Duct (09+09+09+09) Duct (09+09+09+09) 35,400 34,400 36,000 34,400 208 V 208 V 36,000 34,400 230 V 230 V 24,600 25,400 3,760 3,940 3,020 3,100 208 V 208 V 3,020 3,100 230 V 230 V 3,450 3,340 9.40 8.70 18.0 15.0 9.3 (7.2) 9.0(7.0) 3.50 3.25 Munsell 3.0Y 7.8/1.1 208/230, 1, 60 20 19 0.93 TNB220FMCH U-V 0.61 V-W 0.61 W-U 0.61 14.4 15 LEV 54/57 Reverse cycle 35-7/16 12-19/32 35-7/16 153 Wireless type 12-24 V DC Not supplied (optional parts) 1/4 A: 1/2 B,C,D: 3/8 Flared Flared 8 lb. 13 oz. 29.4 (NEO22) 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 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 NOISE CRITERIA CURVES 4 MXZ-2B20NA FAN SPEED FUNCTION SPL(dB(A)) LINE MXZ-3B24NA Cooling 49 High Cooling 54 High Heating 51 High Heating 49 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 10 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 80 NC-20 10 125 250 500 1000 2000 4000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 8000 NC-20 125 MXZ-3B30NA FAN SPEED FUNCTION SPL(dB(A)) 1000 2000 4000 8000 FAN SPEED FUNCTION SPL(dB(A)) High Cooling 49 High Cooling 54 High Heating 49 High Heating 57 LINE 90 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR 500 MXZ-4B36NA LINE 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 10 250 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz 20 LINE 90 90 20 FAN SPEED FUNCTION SPL(dB(A)) High 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 80 NC-20 125 250 500 1000 2000 4000 10 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 NC-20 125 250 500 1000 2000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz 7 4000 8000 OUTLINES AND DIMENSIONS 5 MXZ-2B20NA Unit: inch 6-21/32" 11-11/32" 14-3/16" 13/16" 17/32" Side Air Intake 3- (1-5/16") Drain Hole 11/16" Air Discharge 15-19/32" Rear Air Intake (Bolt Pitch) 9-3/16" 1-7/32" 21/32" 2-1/2" 19-11/16" 11/16" 6-9/16" 4-(13/32"×13/16") Oval Hole (Foundation Bolt M10) 33-1/16" 1-3/16" 7-7/8" 1-3/16" 13" 1/2" 3- 7/8" Punched holes (Connecting wire hole) 2-3/8" 2-5/8" LIQ 14-1/4" 5-5/16" 1-25/32" 14-3/16" 27-15/16" 1-3/16" 9-7/16" 1-5/32" GAS LIQ 11-3/4" 1.Installation space Note : Leave front and both sides free of obstruction. More than 19-11/16" 29/32" LIQ 1/4"FLARE GAS 3/8"FLARE Unit A 3-5/16" GAS Unit B More than 3-15/16" Grounding terminal Conduit cover More than 7-7/8" More than 19-11/16" 2.Service space More than 3-15/16" More than13-25/32" More than 3-15/16" Note : Leave rear, overhead and both sides free of obstruction. Lock nut Connector More than 19-11/16" Note : Leave front and overhead free of obstruction. More than 3-15/16" More than 13-25/32" 8 SERVICE SPACE More than 13-25/32" MXZ-3B24NA MXZ-3B30NA Unit: inch 7-7/8" 7-7/8" 10-5/8" Air in 5/8" Air out 1-9/16" Drain hole 3- 1-5/16" 14" (Bolt pitch) 15-1/4" 5/8" 15/16" 7/16" Air in 2-U Shaped notched hole (Base bolt M10) 1-1/16" 1-3/8" 1-3/8" 2-29/32" 9-27/32" 19-11/16" 2-(15/32" x 1-13/32") Oval hole (Base bolt M10) 3- 7/8"Punched hole (Connect wiring hole) 35-7/16" 2- 7/8"Knockout (Connect wiring hole) Handle 1-3/16" 12-19/32" 13/32" 19-1/8" B A Gas pipe 3/8 (B,C unit) 1/2 (A unit) C unit connection B unit connection A unit connection Liquid pipe 1/4 flared More than 3-15/16" More than 7-7/8" Lock nut Connector Conduit cover More than13-25/32" More than 19-11/16" More than 3-15/16" 2.Service space More than 19-11/16" Note : Leave front and overhead free of obstruction. Note : Leave rear, overhead and both sides free of obstruction. 3-15/32" C More than 3-15/16" Note : Leave front and both sides free of obstruction. More than 19-11/16" 1.Installation space 29/32" 5-3/16" 12-1/2" 1-25/32" 18-1/8" 8-27/32" 35-7/16" 4-3/4" 1-3/16" Handle More than 3-15/16" More than 13-25/32" 9 SERVICE SPACE More than 13-25/32" MXZ-4B36NA Unit: inch 7-7/8" 7-7/8" 10-5/8" Air in 5/8" Air out 1-9/16" Drain hole 3- 1-5/16" 14" (Bolt pitch) 15-1/4" 5/8" 15/16" 7/16" Air in 2-U Shaped notched hole (Base bolt M10) 1-1/16" 1-3/8" 1-3/8" 2-29/32" 9-27/32" 19-11/16" 2-(15/32" x 1-13/32") Oval hole (Base bolt M10) 3- 7/8"Punched hole (Connect wiring hole) 35-7/16" 2- 7/8"Knockout (Connect wiring hole) Handle 1-3/16" 12-19/32" 13/32" 4-3/4" 35-7/16" D 19-1/8" C B A Gas pipe 3/8 (B,C,D unit) 1/2 (A unit) D unit connection C unit connection B unit connection A unit connection Liquid pipe 1/4 flared More than 3-15/16" More than 7-7/8" Lock nut Connector Conduit cover More than13-25/32" More than 19-11/16" More than 3-15/16" 2.Service space More than 19-11/16" Note : Leave front and overhead free of obstruction. Note : Leave rear, overhead and both sides free of obstruction. 3-15/32" More than 3-15/16" Note : Leave front and both sides free of obstruction. More than 19-11/16" 1.Installation space 29/32" 5-3/16" 12-1/2" 1-25/32" 18-1/8" 12-13/32" 1-3/16" Handle More than 3-15/16" More than 13-25/32" 10 SERVICE SPACE More than 13-25/32" 6 WIRING DIAGRAM MXZ-2B20NA MXZ-2B20NA - 1 11 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 12 REFRIGERANT SYSTEM DIAGRAM 7 Unit: inch MXZ-2B20NA Service port Compressor R.V. coil OFF ON Refrigerant flow in cooling Refrigerant flow in heating Oil separator Stop valve with service port Indoor unit B Discharge temperature thermistor RT62 Service port Capillary tube O.D.0.10 x I.D.0.02 x 39.37 4-way valve Muffler Indoor unit A Outdoor heat exchanger temperature thermistor RT68 HEX-OUT FAN-OUT Indoor unit A Defrost thermistor RT61 Capillary tube O.D.0.16 x I.D.0.11 x 3.93 Strainer #100 Capillary tube O.D.0.14 x I.D.0.09 x 19.68 LEV A Stop valve Strainer #100 LEV E Power receiver Indoor unit B Ambient temperature thermistor RT65 Capillary tube O.D.0.16 x I.D.0.11 x 3.93 Strainer #100 LEV B 13 Strainer #100 Distributor Operating Range MXZ-2B20NA Maximum Minimum Maximum Minimum Cooling Heating 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-2B20NA 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. 33 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, see the appropriate parts catalog, Optional parts "DIFFERENT DIAMETER PIPE"(2-1.). Unit: inch Indoor unit class 09 or less 12 15 Outdoor unit union diameter For Liquid Indoor unit A Gas Liquid Indoor unit B Gas Extension pipe diameter Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 1/2 14 1/4 3/8 1/4 3/8 MXZ-3B24NA MXZ-3B30NA R.V. coil OFF ON Unit: inch Service port Compressor Service port Discharge temperature Refrigerant flow in cooling High-pressure thermistor RT62 switch Refrigerant flow in heating Oil separator Indoor unit C Stop valve (with service port) Indoor unit B Indoor unit A Muffler Capillary tube O.D.0.10 x I.D.0.02 x 39.37 4-way valve Outdoor heat exchanger Outdoor heat exchanger temperature thermistor RT68 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 Indoor unit A Indoor unit B Indoor unit C Strainer #100 LEV A Strainer #100 LEV B Strainer #100 LEV C Ambient temperature thermistor RT65 Defrost thermistor RT61 Stop valve Strainer #100 LEV F Power receiver 15 Strainer #100 Capillary tube O.D.0.12 x I.D.0.08 x 11.8 Distributor Operating Range MXZ-3B24NA MXZ-3B30NA 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 Maximum Minimum Maximum Minimum Cooling Heating MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3B24NA MXZ-3B30NA 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 b 49 ft. 49 ft. 33 ft. c 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, see the appropriate parts catalog, Optional parts "DIFFERENT DIAMETER PIPE"(2-1.). Unit : inch Outdoor unit union diameter Indoor unit class 09 or less 12 15 17 18 24 (MXZ-3B30NA only) For Extension pipe diameter Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 5/8 Indoor unit A Indoor unit B Indoor unit C 16 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 MXZ-4B36NA R.V. coil OFF ON Unit: inch Service port Compressor Service port Discharge temperature Refrigerant flow in cooling High-pressure thermistor RT62 switch Refrigerant flow in heating Oil separator Indoor unit D Stop valve (with service port) Indoor unit C Indoor unit B Indoor unit A Capillary tube O.D.0.10 x I.D.0.02 x 39.37 4-way valve Muffler Outdoor heat exchanger Outdoor heat exchanger temperature thermistor RT68 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 Indoor unit A Indoor unit B Indoor unit C Indoor unit D Strainer #100 Defrost thermistor RT61 LEV A Strainer #100 LEV B Strainer #100 LEV C Strainer #100 LEV D Ambient temperature thermistor RT65 Stop valve Strainer #100 LEV F Power receiver 17 Strainer #100 Capillary tube O.D.0.12 x I.D.0.08 x 11.8 Distributor Operating Range MXZ-4B36NA 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 Maximum Minimum Maximum Minimum Cooling Heating MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4B36NA 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 33 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, see the appropriate parts catalog, Optional parts "DIFFERENT DIAMETER PIPE"(2-1.). Unit : inch Indoor unit class 09 or less 12 15 17 18 24 Extension pipe diameter Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 5/8 Outdoor unit union diameter For Indoor unit A Indoor unit B Indoor unit C Indoor unit D 18 Liquid 1/4 Gas 1/2 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 Liquid 1/4 Gas 3/8 8 DATA MXZ-2B20NA 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 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 – – – – 1.44 1.65 2.19 1.78 208/230, 1, 60 1.396 1.604 2.06 1.69 6.08/5.87 7.25/6.80 9.81/8.87 7.98/7.22 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 411 319 417 350 141 102 130 101 169 154 174 172 114 100 120 104 71 46 65 46 163 149 185 167 ft 25 [50] Unit But/h – kW – ºF ºF rpm CFM 5 lb. 15 oz. 95 – 650 1485 95 – 650 1485 47 43 700 1640 MXZ-3B24NA Model Indoor type Item Total Capacity SHF Input Electrical Outdoor unit circuit Power supply (V,phase,Hz) 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 47 43 700 1640 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 – – – – 1.76 1.75 2.46 1.9 MXZ-3B24NA 208/230,1,60 1.694 1.681 2.28 1.78 8.00/7.23 7.94/7.18 10.90/9.86 8.43/7.62 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 394 296 408 324 158 98 139 100 173 153 167 164 115 93 117 99 79 47 58 49 159 134 153 144 ft 25[75] – ºF ºF rpm CFM 7 lb.11 oz. Unit But/h – kW 95 – 750 2,068 19 47 43 600 1,605 95 – 750 2,068 47 43 600 1,605 MXZ-3B30NA Model Indoor type Item Total Capacity SHF Input Electrical Outdoor unit circuit Power supply (V,phase,Hz) 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 kW A A PSIG PSIG ºF ºF ºF ºF Non-Duct (09+09+12) Duct (09+09+09) Cooling Heating Cooling Heating 28,400 28,600 27,400 27,600 – – – – 3.12 2.15 3.33 2.22 MXZ-3B30NA 208/230,1,60 3.047 2.081 3.14 2.09 14.71/13.30 9.92/8.97 15.17/13.72 10.36/9.37 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 489 313 496 325 145 94 137 100 208 155 203 168 130 97 133 99 77 40 63 50 186 136 188 152 ft 25[75] Unit But/h – kW – ºF ºF rpm CFM 7 lb.11 oz. 95 – 520 1,365 95 – 520 1,365 47 43 600 1,605 MXZ-4B36NA Model Indoor type Item Total Capacity SHF Input Electrical Outdoor unit circuit Power supply (V,phase,Hz) 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 47 43 600 1,605 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 3.1 MXZ-4B36NA 208/230,1,60 3.672 2.928 3.62 2.86 17.44/15.78 13.83/12.51 17.58/15.90 13.39/12.56 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39 485 309 455 347 142 91 130 95 198 139 202 163 129 95 126 102 66 28 65 32 184 127 186 148 ft 25[100] – ºF ºF rpm CFM 8 lb.13 oz. Unit But/h – kW 95 – 750 2,068 20 47 43 750 2,068 95 – 750 2,068 47 43 750 2,068 8-1. OPERATING RANGE (1) POWER SUPPLY Model MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Outdoor unit 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 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 21 MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 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 Heating (6) Outdoor intake air wet-bulb temperature : °FWB (7) Total input : W Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service. How to measure the indoor air wet-bulb/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 22 Wet-and dry-bulb thermometers 8-2. CAPACITY AND THE INPUT CURVES MXZ-2B20NA 13.1 6.1 9.5 11.5 12.1 5.6 8.6 10.4 11.2 5.0 7.9 9.5 10.1 4.7 7.0 8.6 9.0 4.1 6.3 7.6 8.1 Capacity correction factors 10.3 12.4 1.5 Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 72 68 64 113 0.9 15 class (69Hz) 6.7 12 class (50Hz) 14.4 09 class (35Hz) 11.2 13.5 06 class (25Hz) Indoor unit class (Inverter output frequency) Indoor air WB temperature difference (degree) Cooling capacity (at Rated frequency) 7.2 14 23 32 41 50 59 68 77 86 95 104 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency) Input correction factors 1.3 1.2 72 68 64 75 79 1.1 1.0 0.9 Indoor intake air Wet-bulb temperature( F) 0.8 14 23 32 41 50 59 68 77 86 95 104 113 Heating capacity (at Rated frequency) 1.2 e( tur 1.1 era 1.0 bu ry- lb °F) 59 68 79 p tem ir D 0.9 a ke ta 0.8 r in oo Ind 0.7 0.6 0.5 Total input (Heating : at Rated frequency) 1.3 Input correction factor 1.3 Capacity correction factor 47.5 43.7 40.1 36.5 32.8 29.2 25.6 22.0 18.2 14.6 15 class (78Hz) 40.9 37.6 34.6 31.3 28.3 25.0 22.0 18.9 15.7 12.6 12 class (59Hz) 32.8 30.2 27.7 25.2 22.7 20.2 17.6 15.1 12.6 10.1 09 class (47Hz) 22.1 20.5 18.7 17.1 15.3 13.7 11.9 10.3 8.5 6.8 06 class (31Hz) Indoor unit class (Inverter output frequency) Indoor air DB temperature difference (degree) Outdoor intake air Dry-bulb temperature (°F) 1.2 F) re (° 1.1 1.0 inta oor 79 68 59 lb te y-bu ir Dr ke a 0.9 ratu mpe Ind 0.8 0.7 0.6 0.5 0.4 0.4 5 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 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. 23 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 19.3 7.2 10.3 12.4 12.2 15.5 17.8 6.7 9.5 11.5 11.2 14.2 16.2 6.1 8.6 10.4 10.3 13.0 14.8 5.6 7.9 9.5 9.4 11.7 13.3 5.0 7.0 8.6 8.5 10.6 12.1 4.5 6.3 7.6 7.6 10.6 09 class (20Hz) 12 class (29Hz) 15 class (33Hz) 18 class (49Hz) 9.4 1.5 Capacity correction factors 13.1 16.7 Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 72 68 64 113 0.9 *24 class (56Hz) 11.2 13.5 06 class (15Hz) Indoor unit class (Inverter output frequency) Indoor air WB temperature difference (degree) Cooling capacity (at Rated frequency) 7.7 14 23 32 41 50 59 68 77 86 95 104 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency) Input correction factors 1.3 1.2 72 68 64 75 79 1.1 1.0 0.9 Indoor intake air Wet-bulb temperature( F) 0.8 14 23 32 41 50 59 68 77 86 95 104 113 Heating capacity (at Rated frequency) 1.2 era 1.0 ir ea 0.9 0.8 Ind 0.7 oo r in ulb °F) e( tur 1.1 59 68 779 p tem y-b Dr tak 0.6 0.5 Total input (Heating : at Rated frequency) 1.3 Input correction factor 1.3 Capacity correction factor 47.3 43.7 40.1 36.4 32.8 29.2 25.6 21.8 18.2 14.6 *24 class (72Hz) 51.5 47.5 43.6 39.6 35.6 31.7 27.7 23.8 19.8 15.8 18 class (50Hz) 47.5 43.7 40.1 36.5 32.8 29.2 25.6 22.0 18.2 14.6 15 class (44Hz) 43.2 40.0 36.5 33.3 29.9 26.6 23.2 20.0 16.6 13.3 12 class (32Hz) 32.8 30.2 27.7 25.2 22.7 20.2 17.6 15.1 12.6 10.1 09 class (26Hz) 23.4 21.6 19.8 18.0 16.2 14.4 12.6 10.8 9.0 7.2 06 class (18Hz) Indoor unit class (Inverter output frequency) Indoor air DB temperature difference (degree) Outdoor intake air Dry-bulb temperature (°F) 1.2 1.1 F) re (° 1.0 lb y-bu ir Dr tu pera 79 68 59 tem ke a 0.9 ta or in Indo 0.8 0.7 0.6 0.5 0.4 0.4 5 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 5 14 23 32 41 50 Outdoor intake air Wet-bulb temperature (°F) 59 * MXZ-3B30/4B36NA only NOTE: The above broken lines are for the heating operation without any frost and defrost operation. 24 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2B20NA) 1. 06-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0 50 0 100 Hz Frequency 50 Frequency <HEAT>Capacity 2.5 <HEAT>Total input 2.5 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 100 Hz 0 50 100 Hz 0 Frequency 50 Frequency 100 Hz 2. 09-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 0 100 Hz Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 100 Hz 0 Frequency 50 Frequency 100 Hz 3. 12-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 Hz 0 Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 0 100 Hz Frequency 50 Frequency 100 Hz 4. 15-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 Frequency 100 Hz 0 50 Frequency 100 Hz 25 0 50 Frequency <HEAT>Total input 2.0 100 Hz 0 50 Frequency 100 Hz (OUTDOOR UNIT: MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) 1. 06-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 2.0 1.5 1.5 1.5 1.0 1.0 1.0 <HEAT>Total input 2.5 2.0 1.5 1.0 0.5 0.5 0 50 0.5 0 100 Hz Frequency 50 Frequency 100 Hz 0.5 0 50 100 Hz 0 Frequency 50 Frequency 100 Hz 2. 09-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 0 100 Hz Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 100 Hz 0 Frequency 50 Frequency 100 Hz 3. 12-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 Hz 0 Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 0 100 Hz Frequency 50 Frequency 100 Hz 4. 15-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 0 100 Hz Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 100 Hz 0 Frequency 50 Frequency 100 Hz 5. 18-class unit in single operation <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 Hz 0 Frequency 50 Frequency 100 Hz 0 50 <HEAT>Total input 2.0 100 Hz 0 Frequency 50 Frequency 100 Hz 6. 24-class unit in single operation (MXZ-3B30/4B36NA only) <COOL>Capacity 2.0 <COOL>Total input 2.0 <HEAT>Capacity 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 Frequency 100 Hz 0 50 Frequency 100 Hz 0 50 Frequency 26 <HEAT>Total input 2.0 100 Hz 0 50 Frequency 100 Hz 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 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) 170 perature In tem door DB (°F) 150 140 130 86 80 75 Outdoor unit current (A) Outdoor low pressure 160 6.0 70 4.0 ure erat p m e (°F) Bt or D Indo 3.0 86 80 75 70 40 Hz 2.0 1.0 40 Hz 120 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) 7.0 Outdoor unit current (A) Ambient temperature (°F) (2) HEAT operation Data is based on the condition of indoor humidity 75% Set air flow to High speed. Inverter output frequency is 48 Hz. 5.0 6.0 5.0 4.0 F) re (° r DB o Indo te ratu mpe 75 70 65 3.0 48 Hz 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (°F) Ambient temperature (°F) 27 2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 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) 170 86 80 150 140 75 130 Outdoor unit current (A) re (°F) mperatu DB te Indoor 70 5.0 F) re (° 4.0 tu pera m B te or D Indo 3.0 86 80 75 70 40 Hz 2.0 1.0 40 Hz 120 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 indoor humidity 75% Set air flow to High speed. Inverter output frequency is 48 Hz. 7.0 Outdoor unit current (A) Outdoor low pressure 160 6.0 6.0 5.0 ture 4.0 B or D Indo era temp (°F) 75 70 65 3.0 48 Hz 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (°F) Ambient temperature (°F) 28 3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 40 Hz 160 r DB Indoo 6.0 (˚F) rature e temp 86 80 150 75 140 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 <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 40 Hz (COOL) or 48 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. 70 130 ure rat mpe 4.0 (˚F) 86 80 75 70 te r DB o Indo 3.0 40 Hz 2.0 1.0 40 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 indoor humidity 75% Set air flow to High speed. Inverter output frequency is 48 Hz. Outdoor unit current (A) 7.0 6.0 5.0 4.0 F re (˚ ratu e p m B te or D o d n I ) 75 70 65 3.0 48 Hz 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) 29 4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 40 Hz 160 F ure (˚ perat m e t r DB Indoo 6.0 ) 86 5.0 80 150 75 140 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 <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 40 Hz (COOL) or 48 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. 4.0 3.0 or Indo F re (˚ eratu p m e DB t 86 80 75 70 ) 40 Hz 2.0 70 130 1.0 40 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 indoor humidity 75% Set air flow to High speed. Inverter output frequency is 48 Hz. Outdoor unit current (A) 7.0 6.0 5.0 4.0 3.0 ( ˚F ture a r e mp B te or D o d In ) 75 70 65 48 Hz 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) 30 5. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (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 80 140 75 130 70 120 6.0 86 ) e (˚F ratur e p B tem or D Indo Outdoor unit current (A) (PSIG) 160 24 Hz 5.0 4.0 ) e (˚F ratur e p B tem or D Indo 86 80 75 70 24 Hz 3.0 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 e( tur a r pe tem B rD oo d n I ˚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) 31 6. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (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 B tem or D Indo 80 140 75 130 70 120 6.0 86 ) Outdoor unit current (A) (PSIG) 160 24 Hz 5.0 ture 4.0 B or D Indo era temp (˚F) 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 e( tur a r pe tem B rD oo d n I ˚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) 32 7. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed : High Inverter output frequency : 24 Hz 150 r Indoo 86 (˚F) rature e p m DB te 5.0 80 140 75 130 120 6.0 70 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 4.0 F re (˚ ratu e p m B te or D o d In ) 86 80 75 70 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 4.0 ( re atu r e p em Bt D oor Ind 75 70 65 ˚F) 32 Hz 3.0 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) 33 8. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (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 r Indoo (˚F) rature e p m DB te 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 4.0 150 80 F re (˚ ratu e p m B te or D Indo 24 Hz 3.0 140 75 86 80 75 70 ) 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 DB oor Ind ( re atu r e p tem ˚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) 34 9. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (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 r Indoo re (˚F eratu p m e DB t ) 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 4.0 150 80 3.0 140 75 (˚F ure erat p m B te or D Indo 86 80 75 70 ) 24 Hz 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 ( re atu r e p em Bt D oor Ind ˚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) 35 10. 24-class unit in single operation (OUTDOOR UNIT : MXZ-4B36NA) (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 170 r Indoo e (˚F ratur e p m DB te ) 7.0 86 6.0 80 160 75 150 140 Outdoor unit current (A) (PSIG) 180 70 5.0 4.0 F) ˚ re ( ratu e p m B te or D o d In 86 80 75 70 24 Hz 3.0 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 3.0 ure DB oor rat mpe (˚F) te Ind 75 70 65 32 Hz 2.0 15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F) Ambient temperature (˚F) 36 9 ACTUATOR CONTROL MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Relation between main sensor and actuator Sensor Purpose Discharge temperature thermistor Protection Indoor coil thermistor Compressor 4-way valve Defrosting Protection Defrost thermistor Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Outdoor heat exchanger temperature Control Protection Control Capacity code 10 Actuator Outdoor LEV fan motor SERVICE FUNCTIONS 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 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control function. Set the 4th Dip Switch of SW2 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control function (MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA). SW2 SW1 ON ON 1 2 3 4 5 6 1 2 3 4 SW1 SW2 SW871 SW1 ON SW2 MXZ-2B20NA ON 1 2 3 4 5 6 1 2 3 4 Turn ON the power supply for the air conditioner. NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF. 37 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 10-2. AUTO LINE CORRECTING <MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA> 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 15 minutes. [How to activate this function] 1. Check that outside temperature is above 32˚F. (This function does not work when outside temperature is not above 32˚F.) SW871 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 electronic control P.C. board. Do not touch energized parts. SW871 LED indication during detection: LED1 (Red) LED2 (Yellow) LED3 (Green) Lighting Lighting Blinking LED indication after detection: Indication LED1 (Red) LED2 (Yellow) LED3 (Green) Lighting Goes out Lighting Completed (Detected successfully) Cannot be corrected Blinking Blinking Blinking Refer to "SAFETY PRECAUTIONS WHEN LED FLASHES" 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) Lighting Lighting Goes out 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 Not corrected Lighting 3 times Corrected Lighting NOTE : Activate this function to confirm the correct wiring after replacing the electronic control P.C. board. (Previous records are deleted when the electronic 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"). 38 11 TROUBLESHOOTING MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 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 mis-wiring. 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 electronic 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 housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 3. Troubleshooting procedure 1) First, 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 abnormality indication is flashing on and off before starting service work. 2) If the electronic 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. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur. 1. Type of failure mode recall function There are 2 types in failure mode recall function as shown below. Indoor and outdoor unit failure mode recall function With this function, failure mode of indoor unit and a part of failure mode of outdoor unit can be recalled. The details of outdoor unit failure mode recall function With this function, more detailed failure mode of outdoor unit can be recalled. Refer to the service manual of indoor unit for how to recall the failure mode and the details of indoor unit failure mode. The outdoor unit failure mode is indicated by the operation indicator lamp on the indoor unit and the LED of outdoor unit. See "11-2.2. Outdoor unit failure mode table". 39 2. Outdoor unit failure mode table The left lamp of OPERATION INDICATOR lamp (Indoor unit) Abnormal point (Failure mode/protection) LED indication Condition (Outdoor P.C. board) LED 1 LED 2 Lighting Lighting Lighting Lighting When overcurrent protection stop is continuously performed three times within 1 minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed three times within 3 minutes after start-up. OFF 2-time flash None (Normal) Outdoor power system 3-time flash Discharge temperature thermistor Lighting Once Defrost thermistor Ambient temperature thermistor Fin temperature thermistor P.C. board temperature thermistor Lighting Lighting Lighting Lighting Outdoor heat exchanger temperature thermistor Lighting 9 times When thermistor shorts or opens during compressor running. Once Twice 3 times 4 times 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 electronic control P.C. board. • Refer to 11-6. "Check of outdoor thermistors". 4-time flash Overcurrent 5-time flash Discharge temperature Lighting Lighting When discharge temperature exceeds •Check refrigerant circuit 240.8°F during operation. and refrigerant amount. • Refer to 11-6. "Check Compressor can restart if discharge of LEV". temperature thermistor reads 212°F or less 3 minutes later. 6-time flash High pressure Lighting Lighting When the outdoor heat exchanger temperature exceeds 158°F during cooling or the indoor gas pipe temperature exceeds 158°F during heating. •Check refrigerant circuit and refrigerant amount. • Check the stop valve. 7-time flash Fin temperature 3 times Goes out When the fin temperature exceeds 188.6°F during operation. P.C. board temperature 4 times Goes out When the P.C. board temperature exceeds 158°F during operation. • Check around outdoor unit. • Check outdoor unit air passage. • Refer to 11-6. "Check of outdoor fan motor". 8-time flash Outdoor fan motor Lighting Lighting When failure occurs continuously three times within 30 seconds after the fan gets started. • Refer to 11-6. "Check of outdoor fan motor". 9-time flash Nonvolatile memory data Lighting 5 times When nonvolatile memory data cannot be read properly. 10-time flash Discharge temperature Lighting Lighting When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 102.2°F for more than 20 minutes. • Replace the outdoor electronic control P.C. board. •Check refrigerant circuit and refrigerant amount. • Refer to 11-6. "Check of LEV". Once Goes out When 28A current flows into intelligent power module. • Reconnect compressor connector. • Refer to 11-6. "How to check inverter/ compressor". • Check the stop valve. NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.). 40 Indoor/outdoor unit failure mode recall function The left lamp of OPERATION INDICATOR lamp(Indoor unit) 11-time flash 15-time flash LED indication (Outdoor P.C. board) LED 1 LED 2 Abnormal point (Failure mode/protection) Indoor/outdoor unit failure mode recall function Remedy Condition Communication error between P.C. boards Lighting 6 times Communication error occurs between the electronic control P.C. board and power board for more than 10 seconds. When the communication between boards protection stop is continuously performed twice. Current sensor Lighting 7 times • Replace the power board. Zero cross detecting circuit 5 times Goes out When a short or open circuit is detected in the current sensor during compressor operating. Current sensor protection stop is continuously performed twice. When zero cross signal cannot be detected while the compressor is operating. The protection stop of the zero cross detecting circuit is continuously performed 10 times. Converter 5 times Goes out When a failure is detected in the operation of the converter during operation. • Check the voltage of power supply. • Replace the power board. Bus-bar voltage (1) 5 times Goes out When the bus-bar voltage exceeds 400V or falls to 200V or below during compressor operating. Bus-bar voltage (2) Even if this protection stop is performed continuously three times, it does not mean the abnormality in outdoor power system. 6 times Goes out When the bus-bar voltage exceeds 400V or falls to 50V or below during compressor operating. • Check the voltage of power supply. • Replace the outdoor electronic control P.C. board. LEV for drain Lighting Lighting When the indoor unit detects any abnormal in the LEV for drain. • Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor unit. • Check the connecting wire between outdoor electronic control P.C. board and power board. • Check the connecting wire among electronic control P.C. board, noise filter P.C. board and power board. NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.). 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". • Indoor unit serial signal error Refer to 11-6. "How to check mis-wiring and serial signal error". • COOL or HEAT operation only Refer to 11-6. "Check of R.V. coil". • When cooling, heat exchanger of non-operating indoor unit frosts. •When heating, nonoperating indoor unit gets warm. Refer to 11-6. "Check of LEV". • When cooling dew drops in the non-operating indoor unit. Check of miss-piping. 41 • When heating, room does not get warm. Refer to 11-6. "How to check inverter/compressor". Check mis-piping, shortage of capacity. • When cooling, room is not cool. Refer to 11-6. "How to check inverter/ compressor". 11-4. TROUBLESHOOTING CHECK TABLE No. Symptom Outdoor unit does not operate. Indication LED1(Red) LED2(Yellow) Condition Abnormal point / Condition Correspondence • Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor unit. Lighting Once LEV for drain When the indoor unit detects any abnormality in the LEV for drain. 2 Lighting Twice Outdoor power system • Check the connection of the compressor connecting When over current protection stop is continuously performed three times wire. within 1 minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed • Refer to 11-6. "How to check inverter/compressor". three times within 3 minutes after start-up. • Check the stop valve. 3 Lighting 3 times Discharge temperature thermistor When a short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 10 minutes of compressor start-up. 4 Lighting 4 times 1 5 Lighting Lighting 7 times 7 Lighting 8 times 8 Lighting 11 times 9 Lighting 12 times 11 Defrost thermistor When a short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes of compressor start-up. Nonvolatile memory data When the nonvolatile memory data cannot be read properly. IPM protection When overcurrent is detected after 30 minutes of compressor start-up. • Reconnect compressor connector. • Refer to 11-6. "How to check inverter/compressor". When overcurrent is detected within 30 minutes of compressor • Check the stop valve. start-up • Check the power module (PAM module). Fin temperature protection P.C. board temperature protection High-pressure protection Converter protection Bus-bar voltage protection (1) Bus-bar voltage protection (2) 15 9 times Goes out 16 13 times Goes out Outdoor fan motor 8 times Current sensor protection 17 Lighting 18 Lighting 11 times 19 Lighting 12 times • Replace the outdoor electronic control P.C. board. • Replace the power board. Goes out Goes out Communication between P.C. boards protection Zero cross detecting circuit protection The protection stop of the zero cross detecting circuit is continuously performed 10 times. • Check the amount of gas and refrigerant circuit. When discharge temperature exceeds 240.8°F during operation. Compressor can restart if discharge temperature thermistor reads 212°F • Refer to 11-6. "Check of LEV". or less 3 minutes later. When the fin temperature exceeds 188.6°F during operation. •Check refrigerant circuit and refrigerant amount. •Refer to 11-6. "Check of outdoor fan motor". When the P.C. board temperature exceeds 158°F during operation. When high-pressure is detected with the high-pressure switch (HPS) during operation. (MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA) When the outdoor heat exchanger temperature exceeds 158°F during cooling or when indoor gas pipe temperature exceeds 158°F during heating. When a failure is detected in the operation of the converter during operation. When the bus-bar voltage exceeds 400V or falls to 200V or below during compressor operating. When the bus-bar voltage exceeds 400V or falls to 50V or below during compressor operating. When failure occurs continuously three times within 30 seconds after the fan gets started. When a short or open circuit is detected in the current sensor during compressor operating. Communication error occurs between the outdoor electronic control P.C. board and power board for more than 10 seconds. When zero cross signal cannot be detected while the compressor is operating. • Check around of gas and the refrigerant circuit. • Check of stop valve. • Replace the power board. • Check the voltage of power supply. • Replace the power board or the outdoor electronic control P.C. board. • Refer to 11-6. "Check of bus-bar voltage". • Refer to 11-6. "Check of outdoor fan motor". • Replace the power board. • Check the connecting wire between outdoor electronic control P.C. board and power board. • Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board. Outdoor electronic control P.C. board (Parts side) NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation. MXZ-2B20NA 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 LED2 LED1 0.5-second ON Lighting MXZ-3B24NA, MXZ-3B30NA MXZ-4B36NA ON OFF "Check of outdoor thermistors". • Check the connecting wire between outdoor electronic control P.C. board and power board. • Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board. 4 times 8 times • Refer to 11-6. When the communication protection stop between boards is continuously performed twice. Discharge temperature protection 14 • Replace the outdoor electronic control P.C. board. Current sensor protection stop is continuously performed twice. Goes out Goes out "Check of outdoor thermistors". Current sensor Lock protection 5 times • Refer to 11-6. Communication error between P.C. boards Zero cross detecting circuit Goes out 13 "Check of outdoor thermistors". When a short or open circuit is detected in the thermistor during operation. When a short circuit is detected in the thermistor during operation, or when an open circuit is detected in the thermistor after 5 minutes (in cooling) and 10 minutes (in heating) of compressor start-up. 'Outdoor unit stops and Twice restarts 3 minutes later' is repeated. 3 times 12 When a short or open circuit is detected in the thermistor during operation. Outdoor heat exchanger temperature thermistor 5 times 6 10 Fin temperature thermistor P.C board temperature thermistor Ambient temperature thermistor • Refer to 11-6. 2.5-second OFF LED1 LED2 2.5-second OFF Lighting 42 No. Symptom Outdoor unit 21 operates. Indication LED1(Red) LED2(Yellow) Once Twice 22 Lighting Lighting Condition Abnormal point / Condition Primary current protection When the input current exceeds 15A. Secondary current protection When the current of the compressor exceeds 15A. Remedy High-pressure protection When the indoor gas pipe temperature exceeds 113°F during heating. Defrosting in cooling When the indoor gas pipe temperature falls 37.4°F or below during cooling. 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. 23 3 times Lighting Discharge temperature protection When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 122°F(COOL mode) /104°F(HEAT mode) for more than 40 minutes. • Check refrigerant circuit and refrigerant amount. • Refer t1 11-6. "Check of LEV". • Refer to 11-6. "Check of outdoor thermistors". 24 4 times Lighting Low discharge temperature protection When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 102.2°F for more than 20 minutes. • Refer to 11-6. "Check of LEV". • Check refrigerant circuit and refrigerant amount. When the outdoor heat exchanger temperature exceeds 136.4°F during operation. This symptom does not mean any abnormality of the product, but check the following points. • Check if indoor filters are clogged. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. When the unit is operated with emergency operation switch. 25 5 times Lighting Cooling high-pressure protection Outdoor unit 26 operates normally. 9 times Lighting Inverter check mode 27 Lighting Lighting Normal - - - Outdoor electronic control P.C. board(Parts side) NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation. MXZ-2B20NA The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”. LED2 LED1 Lighting 0.5-second ON 0.5-second ON MXZ-3B24NA, MXZ-3B30NA MXZ-4B36NA LED1 LED2 ON OFF 2.5-second OFF 2.5-second OFF Lighting 43 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Part name Check method and criterion Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P. C. board”, or 3. “Outdoor power board”, for the chart of thermistor. Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) 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 electronic control P. C. board”, for the chart of thermistor. Compressor W Measure the resistance between terminals using a tester. (Winding temperature: 14°F ~ 104°F) RED V WHT MXZ-2B20NA 0.86 Ω ~ 1.06 Ω U BLK Outdoor fan motor Normal (Each phase) MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 1.29 Ω ~ 1.49 Ω Measure the resistance between lead wires using a tester. (Part temperature: 14°F ~ 104°F) RED WHT BLK U (W) Normal (Each phase) MXZ-2B20NA - V (V) MXZ-2B20NA W (U) 13.4 Ω ~ 16.4 Ω 1 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 13 Ω ~ 16 Ω Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) Normal R.V. coil 1.2 kΩ ~1.56 kΩ Linear expansion valve MXZ-2B20NA WHT LEV RED Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F) ORN YLW BRN BLU The other models WHT LEV RED ORN YLW BLU High pressure switch (HPS) MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Color of lead wire MXZ-2B20NA - 1 MXZ-3B24NA MXZ-2B20NA MXZ-3B30NA MXZ-4B36NA WHT - RED WHT - RED RED - ORN RED - ORN YLW - BRN YLW - RED BRN - BLU RED - BLU HPS Pressure 537 ± 22 PSIG 7 PSIG 696 +- 15 44 Normal 37.4 Ω ~ 53.9 Ω Normal Close Open 11-6. TROUBLESHOOTING FLOW MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Outdoor unit does not operate. Check of power supply Check the connecting of parts of main power supply circuit. Turn ON the power supply. Is there voltage of 208/230 V AC in the power supply terminal block? No Check the power supply cable. Yes Is the output voltage from the noise filter P.C. board 208/230 V AC? No Replace the noise filter P.C. board. Yes Is the input voltage to the power board 208/230 V AC? No Replace the reactor. Yes No Is the input voltage to the outdoor electronic control P.C. board 294/325 V DC? Replace the power board. Yes Replace the outdoor electronic control P.C. board. 45 • 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 mis-wiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply ? No Check the power supply. Yes LED indication for communication status Turn ON the power supply. 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. Is there rated voltage between outdoor terminal block S1 and S2 ? No Check the wiring. Yes Press EMERGENCY OPERATION switch once. Does the left lamp of OPERATION INDICATOR lamp light up ? <Confirmation of the power to the indoor unit> No Yes Is serial signal error indicated 6 minutes later ? MXZ-2B20NA No Yes Outdoor electronic control P.C. board Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire ? (Parts side) Yes Correct them. No LED3 LED2 LED1 A Blinking Pattern LED 3 LED 2 LED 1 1 Lighting Unit B status 2 Goes out Lighting Unit A status Unit C status MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not mis-wiring. Short-circuit outdoor terminal block S2 and S3. 1 1 Mis-wiring 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. Outdoor electronic control P.C. board (Parts side) Does the LED on the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking" ? LED1 LED2 LED3 Blinking Yes Pattern LED 1 LED 2 LED 3 1 Unit A status Unit D status Unit B status Unit C status Lighting Goes out 2 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 No (Lighted or not lighted) · 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 short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 V DC between outdoor terminal block S2 and S3 ? <Confirmation of serial signal> Replace the outdoor electronic 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. 46 Yes Replace the indoor/outdoor connecting wire. The cooling operation or heating operation does not operate. Check of R.V. coil CN912 CN781 Noise filter P.C. board Outdoor electronic control P.C. board • When heating operation does not work. 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 V AC between pin1 and pin 2 at connector CN912 ? No Yes 1. Turn OFF the power supply of indoor and outdoor unit, and disconnect the connector CN781. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode. Turn OFF the power supply of indoor and outdoor unit. Disconnect the connector CN912. Is there normal resistance to R.V. coil ? (Refer to 11-5.) No Replace the R.V. coil. Is there voltage of 12 V DC No between the connector CN781 pin 5 (+) and pin 3 (-) ? Yes Replace the outdoor electronic control P.C. board. Yes Replace the noise filter P.C. board. Replace the 4-way valve. • When cooling operation does not work. 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 V AC between pin1 and pin 2 at connector CN912 ? Yes No Replace the 4-way valve. If the connector CN912 is not connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF. 1. Turn OFF the power supply of the indoor and the outdoor unit, and disconnect the connector CN781. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode. Is there voltage of 12 V DC between the connector CN781 pin 5 (+) and pin 3 (-) ? No Replace the noise filter P.C. board. Yes Replace the outdoor electronic control P.C. board. 47 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get 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 ? Normal No Disconnect the connectors. MXZ-2B CN791: LEV A, CN792: LEV B, CN795: LEV E MXZ-3B/4B CN791: LEV A, CN792: LEV B, CN793: LEV C, CN794: LEV D(MXZ-4B only), CN796: LEV F Is there normal resistance to LEV coil ? (Refer to 11-5.) Yes Replace the outdoor electronic control P.C. board. No Replace LEV coil. 48 • 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. 3 minutes after turning ON the power supply, 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: 50V-250V Is proper output voltage detected? 1, 2 Yes Is output balanced ? Yes 1 • After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage. • The output voltage values have the tolerance of ± 20%. 2 • The output differs depending on the capacity or the number of indoor units to be operated. No No Is the input voltage to the outdoor electronic control P.C. board 370 V or more ? No Replace the power 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 Replace the compressor. 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 49 • 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 board since RT64 is combined with the outdoor power 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. No Does the unit operate 10 minutes or more without showing thermistor abnormality ? Replace the outdoor electronic control P.C. board or the outdoor power board. Yes Normal Thermistor Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temperature Symbol RT61 RT62 RT68 RT65 RT64 Connector, Pin No. Between CN661 pin1 and pin2 Between CN661 pin3 and pin4 Between CN661 pin7 and pin8 Between CN663 pin1 and pin2 Between CN3 pin1 and pin2 Board Outdoor electronic control P.C. board Outdoor power board • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor Disconnect CN932 from the outdoor electronic control P.C. board, and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to 11-5.) Yes No Turn ON the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between (+) and (-) Between (+) and (-) Between (+) and (-) (Fixed to either 5 V or 0 V DC) No No Replace the outdoor fan motor. Does the voltage between each terminal become 5 V DC and 0 V DC repeatedly ? Yes Does the outdoor fan motor rotate smoothly ? Yes Replace the outdoor electronic control P.C. board. 50 • When the operation frequency does not go up from the lowest frequency. Check of HPS MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 1. Disconnect the connector CN681 in the electronic 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. 0Ω Reconnect CN681. 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 electronic 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 electronic control P.C. board. Blink 6 times Blink 5 times Replace the power board. Replace the outdoor electronic control P.C. board. Turn ON power supply. Start operation. Confirm LED1 indication lamp on the outdoor electronic control P.C. board. Blink 9 times Lighting Replace the outdoor electronic control P.C. board. Turn ON power supply. Start operation. Lighting Normal Lighting Replace the outdoor electronic control P.C. board. Confirm LED1 indication lamp on the outdoor electronic control P.C. board. Blink 9 times Replace the power board. Turn OFF power supply before removing P.C. board. 51 700 MXZ-2B20NA 600 Resistance (kΩ) Outdoor heat exchanger temperature thermistor (RT68) Ambient temperature CN663 thermistor (RT65) CN701 Signal transmission (To power board) 5 V DC pulse wave 300 CN661 Defrost thermistor (RT61) Discharge temperature thermistor (RT62) 200 100 80 70 60 50 40 86 104 122 140 158 176 194 212 230 248 30 Temperature (°F) 20 10 0 LEV E ( CN781 68 12 V DC 50 -4 14 32 50 68 86 Temperature (°F) 104 ( ( (–) ( (+) (–) (+) (+) (–) (+) ( ( GND (power board) Rush current relay (–) (–)R.V. coil 32 CN702 GND Signal reception (From power board) 15 V 5 V DC pulse wave 15 V 0 CN795 12 V DC pulse wave Resistance (kΩ) 90 400 ( ( ( CN931 5 V DC pulse wave 5V GND 100 500 ( ( CN932 20-90 V AC Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) ( ( To fan motor 11-7. TEST POINT DIAGRAM AND VOLTAGE 1. Outdoor electronic control P.C. board LED 1 LED 2 LED 3 DM06Y765 SW1 Bus-bar voltage CN801 294 V DC ~ 370 V DC Input CN602 Serial signal Room B 12~24 V DC F801 FUSE T3.15AL250V CN601 208/230 V AC Input Serial signal Room A ( ( (+) (–) 12 V DC pulse wave LEV Room A 12 V DC pulse wave LEV Room B 52 CN791 ( (–) ( ( ( (+) CN792 12~24 V DC MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) 90 Resistance (kΩ) 100 600 To fan motor 5 V DC pulse wave 5 V DC GND Defrost thermistor (RT61) Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature thermistor (RT68) CN661 Ambient temperature thermistor (RT65) CN663 Resistance (kΩ) Signal transmission (To power board) 5 V DC pulse wave CN701 Signal reception (From power board) 5 V DC pulse wave CN702 15 V DC GND GND (–)Rush current relay 700 500 400 300 200 32 50 68 60 50 30 86 104 122 140 158 176 194 212 230 248 Temperature (°F) 20 10 -4 14 32 50 68 86 Temperature (°F) 104 (+) ( ( (–)R.V. coil CN781 0 ( CN932 20-90 V AC 70 40 100 0 80 LED 1 LED 2 LED 3 F931 FUSE T3.15AL250V CN631 Serial signal Room D 12~24 V DC CN621 Serial signal Room C 12~24 V DC SW1 SW2 SW871 CN611 Serial signal Room B 12~24 V DC Bus-bar voltage CN801 294~370 V DC Input CN601 208/230 V AC Input Serial signal Room A 12~24 V DC F801 FUSE T3.15AL250V {( – + CN796 LEV F 12 V DC pulse wave ( CN794 LEV Room D CN793 LEV Room C CN792 LEV Room B CN681 High pressure switch 53 CN791 LEV Room A 2. Noise filter P.C. board MXZ-2B20NA CN901 To electronic control P.C. board { { CN912 R.V. coil 208/230 V AC CN903 CN902 To power To power board board { CN61 208/230 V AC Output 208/230 V AC Output F65 FUSE T6.3AL250V F64 FUSE T2AL250V 208/230 V AC Input MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA CN912 R.V. coil 208/230 V AC { CN903 To power board { { CN901 To electronic CN902 control To power P.C. board board CN61 208/230 V AC Output 208/230 V AC Output F65 FUSE T6.3AL250V F64 FUSE T2AL250V 208/230 V AC Input 54 3. Outdoor Power board Fin temperature thermistor (RT64) 200 MXZ-2B20NA Resistance (kΩ) 180 DM00N019 or DM00N095 160 140 120 100 80 60 40 20 0 32 50 68 86 104 122 140 158 176 Temperature (°F) Connect to the compressor Voltage among phases: 5 V to 180 V Connect to the earth 294-370 V DC Output (Red) (+) 1 CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5 V DC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15 V (+)7-5(–): 15 V (–) 3 (White) CN3 Fin temperature thermistor RT64 reception (From ) Signal electronic control P.C. board) 5 V DC pulse wave CN5 Primary current detection (Connect to the noise filter) 55 Fin temperature thermistor (RT64) 200 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Resistance (kΩ) 180 160 140 120 100 80 60 40 20 0 32 50 68 86 104 122 140 158 176 Temperature (°F) Connect to the compressor Voltage among phases: 5 V to 180 V Connect to the earth 294-370 V DC Output (Red) (+) 1 CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5 V DC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15 V (+)7-5(–): 15 V (–) 3 (White) CN3 Fin temperature thermistor RT64 reception (From ) Signal electronic control P.C. board) 5 V DC pulse wave CN5 Primary current detection (Connect to the noise filter) 56 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 Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Hold the sleeve, and pull out the terminal slowly. Connector 12-1. MXZ-2B20NA OPERATING PROCEDURE PHOTOS 1. Removing the compressor Photo 1 (1) Remove the screws of the top panel, and remove the top panel. (2) Remove the screws of the service panel, and remove the service panel. (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (4) Remove the screws of the cabinet, and remove the cabinet. (5) Remove the screws of the back panel, and remove the back panel (Photo 3). (6) Disconnect the compressor lead wire from terminal of the compressor (U, V, W). (7) Disconnect the outdoor electronic control P.C. board connectors: CN661, CN663, CN791, CN792, CN795, CN931, CN932 Disconnect the noise filter P.C. board connector: CN912 (8) Remove the screws of the electrical parts, and remove the electrical parts (Photo 4). (9) Remove the propeller. (10) Remove the screws of the separator, and remove the separator (Photo 6). (11) Remove the sound proof felt (Photo 6). (12) Detach the welded parts of the compressor suction and discharge pipes (Photo 5). (13) Remove the compressor nuts and remove the compressor. Screws of the cabinet Screws of service panel Screws of the cabinet Screw of the cabinet Photo 2 Screws of the top panel Screws of the cabinet 57 Screws of the top panel Screws of the sub panel Screws of the cabinet PHOTOS OPERATING PROCEDURE Photo 4 2. Removing the electronic control P.C. board (1) Remove the screws of the sub panel. (2) Remove the sub panel. (3) Disconnect all connectors and lead wires on the electronic control P.C. board. (4) Remove the electronic control P.C. board. Screw of the rear guard Screws of the electrical parts Photo 3 Photo 5 R.V. coil Screws of the back panel 4 way valve LEV coil E Expansion valve E Screws of the back panel Suction pipe welded part Discharge pipe welded part Screws of the back panel Screw of the back panel Compressor nuts 3. Removing the fan motor (1) Remove the top panel, the service panel, and the cabinet (Photo 1, 2). (2) Disconnect the connector CN931 and CN932 on the outdoor electronic control P.C. board. (3) Remove the propeller. (4) Remove the fan motor. Photo 6 Screws of the outdoor fan motor Propeller nut 58 Propeller Separator Sound proof felt OPERATING PROCEDURE PHOTOS 4. Removing the 4-way valve (1) Remove the top panel (Photo 1). (2) Remove the service panel, the cabinet, and the back panel (Photo 1, 2, 3). (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. Photo 7 4 way valve (4) Remove the electrical parts (Photo 4). (5) Detach the welded parts of 4-way valve and pipe (Photo 7). R.V. coil Welded parts 5. Removing the expansion valve Photo 8 (1) Remove the top panel (Photo 1). (2) Remove the service panel, the cabinet, and the back panel (Photo 1, 2, 3). (Gas recovery is not required if the unit is pumped down.) (3) Remove the electrical parts for removing LEV E (Photo 4, 5). (4) Remove the LEV coils. (5) Detach the welded parts of expansion valves and pipes. Expansion valves LEV coils Photo 9 6. Removing the reactor (1) Remove the top panel (Photo 1). (2) Remove the service panel, cabinet, back panel, and the electrical parts (Photo 1, 2, 3, 4). (3) Disconnect the reactor lead wire from the terminal of the reactor. (4) Remove the screws of the reactor, and remove the reactor (Photo 9). Screws of the reactor 59 12-2. MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Photo : MXZ-3B24NA OPERATING PROCEDURE PHOTOS Photo 1 Screws of the top panel 1. Removing the compressor (1) Remove the screws of the top panel, and remove the top panel. (2) Remove the screws of the service panel, and remove the service panel. (3) Recover gas from the refrigerant circuit. NOTE : Recover gas from the pipes until the pressure gauge shows 0 PSIG. (4) Remove the screws of the front panel, and remove the front panel. (5) Remove the screws of the rear panel, and remove the rear panel. (6) Disconnect the compressor lead wire from terminal of compressor (U, V, W). (7) Disconnect the outdoor electronic control P.C. board connectors: CN661, CN663, CN681, CN791, CN792, CN793, CN794 (MXZ-4B36NA), CN796, CN931, CN932 Disconnect the noise filter P.C. board connector: CN912 (8) Remove the screws of the electrical parts, and remove the electrical parts. (9) Remove the propeller. (10) Remove the screws of the separator, and remove the separator. (11) Remove the sound proof felt (Photo 5). (12) Detach the welded parts of the compressor suction and discharge pipes (Photo 4). (13) Remove the compressor nuts and remove the compressor. Screws of service panel Screws of the front panel Photo 2 Screws of the top panel Screws of the side panel Photo 4 Screws of the service panel Screws of the rear panel Photo 3 Suction pipe welded part Discharge pipe welded part Screws of the electrical parts 60 Photo : MXZ-3B24NA PHOTOS OPERATING PROCEDURE Photo 5 2. Removing the fan motor (1) Remove the top panel, the service panel, and the front panel (Photo 1, 2). (2) Disconnect the connectors CN931 and CN932 on the outdoor electronic control P.C. board. (3) Remove the propeller. (4) Remove the fan motor. Screws of the outdoor fan motor Propeller Propeller nut Separator Sound proof felt Photo 6 3. Removing the 4-way valve (1) Remove the top panel (Photo 1, 2). (2) Remove the service panel, rear panel, and pipe cover (Photo 1,2). (3) Recover gas from the refrigerant circuit. NOTE : Recover gas from the pipes until the pressure gauge shows 0 PSIG. (4) Remove the electrical parts (Photo 3). (5) Detach the welded parts of 4-way valve and pipe. 4 way valve R.V. coil Welded parts 4. Removing the expansion valve Photo 7 (1) Remove the top panel (Photo 1, 2). (2) Remove the service panel (Photo 1, 2). (Gas recovery is not required if the unit is pumped down.) (3) Remove the front panel for removing LEV F (Photo 1). (4) Remove the electrical parts for removing LEV F (Photo 3). (5) Remove the LEV coils. (6) Detach the welded parts of expansion valves and pipes. LEV coil F Expansion valve F Expansion valves LEV coils 61 Photo : MXZ-3B24NA OPERATING PROCEDURE PHOTOS 5. Removing the reactor Photo 8 (1) Remove the top panel (Photo 1, 2). (2) Disconnect the reactor lead wire. (3) Remove the screws of the reactor, and remove the reactor. Screws of the reactor 62 63 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CO., LTD Distributed in Mar. 2010. No. OBH560 REVISED EDITION-C 6 Distributed in Feb. 2010. No. OBH560 REVISED EDITION-B 6 Distributed in Dec. 2009. No. OBH560 REVISED EDITION-A 5 Distributed in Sep. 2009. No. OBH560 5 Made in Japan New publication, effective Mar. 2010 Specifications subject to change without notice. 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