Revision C: • 3. SPECIFICATION has been corrected. • Some descriptions have been modified. Please void OBH702 REVISED EDITION-B. OUTDOOR INDOOR UNIT UNIT HFC SERVICE MANUAL utilized No.
Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added.
OBH702C 3
1 TECHNICAL CHANGES MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 1. New model MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA 1. New model MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NA2 - U1 MXZ-3C30NA2 - U1 MXZ-4C36NA2 - U1 MXZ-5C42NA2 - U1 MXZ-2C20NAHZ2 - U1 MXZ-3C24NAHZ2 - U1 MXZ-3C30NAHZ2 - U1 1. Outdoor control P.C. board has been changed.
2 PART NAMES AND FUNCTIONS MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2 Air inlet (Back and side) Air outlet Drain outlet MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Air inlet (Back and side) Air outlet Drain outlet OBH702C 5
3 SPECIFICATION Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
Item Capacity Power consumption Cooling Heating 47 Heating 17 Cooling Heating 47 Heating 17 Cooling Cooling Heating Heating *1 *1 *2 *1 *1 *2 Outdoor model Indoor type Btu/h Btu/h Btu/h W W W EER SEER HSPF IV(V) COP External finish Power supply V, phase, Hz Max. fuse size (time delay) A Min. circuit ampacity A Fan motor F.L.A Model Winding resistance Ω (at 68 ºF) Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) Defrost method W in. Dimensions D in. H in. Weight lb.
NOISE CRITERIA CURVES 4 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 51 High Cooling 52 High Heating 55 High Heating 56 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.
MXZ-5C42NA MXZ-5C42NA2 MXZ-2C20NAHZ MXZ-2C20NAHZ2 FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 56 High Cooling 54 High Heating 58 High Heating 58 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.
5 OUTLINES AND DIMENSIONS MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 Unit: inch (mm) Conduit plates Conduit connector Lock nut OBH702C 15
Unit: inch (mm) MXZ-4C36NA MXZ-4C36NA2 Conduit plates Conduit connector Lock nut OBH702C 16
Unit: inch (mm) MXZ-5C42NA MXZ-5C42NA2 Conduit plate Top Lock nut OBH702C 17 Conduit connector Conduit plate Under
Unit: inch (mm) MXZ-2C20NAHZ MXZ-2C20NAHZ2 Lock nut Conduit plate Conduit connector OBH702C 18
MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Unit: inch (mm) Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702C 19
6 WIRING DIAGRAM MXZ-3C24NA MXZ-3C30NA OBH702C 20
MXZ-3C24NA2 MXZ-3C30NA2 OBH702C 21
MXZ-4C36NA OBH702C 22
MXZ-4C36NA2 OBH702C 23
MXZ-5C42NA L1 L2 WHT WHT RED TAB5 RED TAB3 TAB6 IC411 IC501 CIRCUIT X52CA TAB4 IC401 U WHT V RED W PTC1 POWER SUPPLY 208/230V 1 phase 60Hz PTC2 PTC3 TB6 D1 OUTDOOR POWER P.C.
MXZ-5C42NA2 OBH702C 25
MXZ-2C20NAHZ OBH702C 26
MXZ-2C20NAHZ2 OBH702C 27
MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702C 28
MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702C 29
REFRIGERANT SYSTEM DIAGRAM 7 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 R.V.
Operating Range MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 Indoor intake air temperature Outdoor intake air temperature Cooling Heating Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-3C24NA MXZ-3C30NA MXZ-3C24NA2 MXZ-3C30NA2 Piping length each indoor unit (a, b, c) Total piping length (a+b+c) Bending point for each unit Total bending point 82 ft.
MXZ-4C36NA MXZ-4C36NA2 R.V.coil OFF ON Unit: inch (mm) Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Muffler Union Indoor unit A Indoor unit B Indoor unit C Indoor unit D Header(Gas) Service port Stop valve (with service port) ĭ1/2 Compressor shell temperature thermistor RT62 4-way valve ĭ3/8 Sub muffler ĭ3/8 Header (Evaporator) Outdoor heat exchanger ĭ3/8 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (Ø4.0 x Ø2.
Operating Range MXZ-4C36NA MXZ-4C36NA2 Indoor intake air temperature Outdoor intake air temperature Cooling Heating Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-4C36NA MXZ-4C36NA2 Piping length each indoor unit (a, b, c, d) Total piping length (a+b+c+d) Bending point for each unit Total bending point 82 ft. MAX. 230 ft. MAX. 25 MAX. 70 MAX.
MXZ-5C42NA R.V.coil OFF ON Unit: inch (mm) Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Union Indoor unit A Indoor unit B Indoor unit C Indoor unit D Indoor unit E Compressor shell temperature thermistor RT62 Service port High pressure switch Service port Header(Gas) Ø1/2 4-way valve Ø3/8 Stop valve (with service port) Ø3/8 Ø3/8 Header(Evaporator) 2-way solenoid valve Ø3/8 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.
Operating Range MXZ-5C42NA MXZ-5C42NA2 Indoor intake air temperature Outdoor intake air temperature Cooling Heating Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-5C42NA MXZ-5C42NA2 Piping length each indoor unit (a, b, c, d, e) Total piping length (a+b+c+d+e) Bending point for each unit Total bending point 82 ft. MAX. 262 ft. MAX. 25 MAX. 80 MAX.
MXZ-2C20NAHZ Unit: inch (mm) R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Compressor shell temperature thermistor RT62 Service port High pressure switch Union Indoor unit A Header(Gas) Service port Ø3/8 4-way valve Stop valve (with service port) Header(Evaporator) 2-way solenoid valve Ø3/8 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (Ø2.5 x Ø0.
Operating Range MXZ-2C20NAHZ MXZ-2C20NAHZ2 Indoor intake air temperature Outdoor intake air temperature Cooling Heating Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION MXZ-2C20NAHZ MXZ-2C20NAHZ2 Piping length each indoor unit (a, b) Total piping length (a+b) Bending point for each unit Total bending point 82 ft. MAX. 164 ft. MAX. 25 MAX. 50 MAX.
MXZ-3C24NAHZ MXZ-3C30NAHZ R. V.
Operating Range MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Indoor intake air temperature Outdoor intake air temperature Cooling Heating Maximum 95°FDB, 71°FWB 115°FDB Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB MAX.
PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere. 1) Turn off the breaker. 2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3) Fully close the stop valve on the liquid pipe side of the outdoor unit. 4) Turn on the breaker. 5) Start the emergency COOL operation on all the indoor units. 6) When the pressure gauge shows 0.
8 DATA Model Indoor type Item Total Capacity SHF Input Electrical Power supply (V, phase, Hz) circuit Input Comp. current (208/230V) Fan motor current Refrigerant Condensing pressure circuit Suction pressure Discharge temperature Condensing temperature Suction temperature Comp. shell bottom temp. Ref.
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.
Model Indoor type Item Capacity Total SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref.
Model Indoor type Item Capacity Total SHF Input Power supply (V, phase, Hz) Input Electrical circuit Comp. current (208/230V) Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Refrigerant Suction temperature circuit Comp. shell bottom temp. Ref.
8-1.
MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA MXZ-3C24NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-4C36NA MXZ-5C42NA MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 The standard specifications apply only to the operation of the air conditioner under normal conditions.
8-2. CAPACITY AND THE INPUT CURVES 7.3 10.5 12.7 12.4 15.8 14.4 6.8 9.6 11.7 11.4 14.5 13.2 6.2 8.8 10.7 10.5 13.2 12.1 5.7 8.0 9.7 9.5 12.0 10.9 5.1 7.2 8.7 8.5 10.7 9.8 4.6 6.5 7.8 7.6 9.5 8.7 Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 * 24 class (54Hz) 18 class (42Hz) Cooling capacity (at Rated frequency) 1.5 Capacity correction factors 15.6 15 class (35Hz) 13.5 17.1 12 class (31Hz) 11.3 13.8 09 class (24Hz) 7.
7.3 10.5 12.7 12.4 15.8 14.4 6.8 9.6 11.7 11.4 14.5 13.2 6.2 8.8 10.7 10.5 13.2 12.1 5.7 8.0 9.7 9.5 12.0 10.9 5.1 7.2 8.7 8.5 10.7 9.8 4.6 6.5 7.8 7.6 9.5 8.7 Indoor intake air Wet-bulb temperature(°F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 class (42Hz) 14 23 59 68 77 86 95 104 Input correction factors 79 72 68 64 75 1.1 1.0 0.9 Indoor intake air Wet-bulb temperature( F) 0.
8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) 1. 06-class unit in single operation 2.0 Capacity Total input 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.0 0.5 0.5 0.5 Capacity 2.5 Total input 2.0 1.5 1.0 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 2. 09-class unit in single operation 2.0 Capacity 2.0 Total input 2.0 0.
(OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) 1. 06-class unit in single operation 2.0 Capacity Total input 2.0 2.0 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 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 2. 09-class unit in single operation 2.0 Capacity 2.0 Total input 2.0 50 100 Frequency 150 Hz Capacity 0 2.0 1.5 1.5 1.5 1.5 1.
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor 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.
2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz 36,* 160 5.0 ,QG 80 140 75 130 70 120 2XWGRRU XQLW FXUUHQW $ Outdoor low pressure 150 6.0 86 Û) S WHP EXOE U\ RRU ' UH HUDWX 1. Set emergency switch to COOL or HEAT.
3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz 150 86 F) ure (˚ perat m e t bulb r DryIndoo 5.0 80 140 75 130 120 6.0 70 Outdoor unit current (A) Outdoor low pressure (PSIG) 160 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit.
4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz 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.
5. 18-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 24 Hz 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.
6. 24-class unit in single operation (OUTDOOR UNIT: MXZ-3C30NA MXZ-4C36NA MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% 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.
7. 06-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes.
8. 09-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes.
9. 12-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes.
10. 15-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4.
11. 18-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5.
12. 24-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C30NAHZ2) (1) COOL operation(1) COOL operation Data is based on the condition of indoor humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5.
9 ACTUATOR CONTROL MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA MXZ-3C24NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-4C36NA MXZ-5C42NA MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 Relation between main sensor and actuator Actuator 2-way solenoid valve Sensor Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Capacity code OBH702C Purpose Protectio
10 SERVICE FUNCTIONS MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA MXZ-3C24NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-4C36NA MXZ-5C42NA MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 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.
10-2. AUTO LINE CORRECTING Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping. Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 20 minutes.
11 TROUBLESHOOTING MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA MXZ-3C24NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-4C36NA MXZ-5C42NA MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing.
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 3 1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received. 3 Refer to the service manual of indoor unit.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-4.). 3. Outdoor unit failure recall mode table The left lamp of OPERATION INDICATOR lamp (Indoor unit) OFF 2-time flash 3-time flash 4-time flash 5-time flash 6-time flash 7-time flash LED indication (Outdoor P.C.
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. LED1 or LED2 has blinked. Both LED1 and Both LED1 and LED2 are lighting. LED2 are OFF. Refer to 11-4. "Troubleshooting check table". Refer to 11-6. "Check of power supply". ,QGRRU XQLW serial signal error Refer to 11-6.
11-4. TROUBLESHOOTING CHECK TABLE No. Symptom 1 Outdoor unit does not operate. 2 3 Indication Abnormal point / Condition LED1(Red) LED2(Yellow) Lighted Once Lighted Twice Lighted 3 times Lighted 4 times 4 5 6 7 8 Lighted 5 times Lighted 6 times Lighted 7 times Lighted 8 times 9 10 11 12 13 14 'Outdoor unit stops and restarts 3 minutes later' is 15 repeated.
No. 21 22 23 24 25 26 27 28 29 Indication Abnormal point / ConCondition dition LED1(Red) LED2(Yellow) Low out side tempera'Outdoor unit The ambient became 10.4°F or less. ture protection(cooling) stops and restarts The ambient became 1.4°F or less. (MXZ-3C24/ 3 minutes 11 times Not lighted 3C30/4C36/5C42NA, MXZ-3C24/3C30/4C36/ Low out side tempera- 5C42NA2) later' is ture protection(Heating) repeated. The ambient became -18°F or less.
11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C30NA MXZ-3C24NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 Part name Defrost thermistor (RT61) Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) MXZ-4C36NA MXZ-5C42NA MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 Check method and criterion Measure the resistance with a tester. Refer to 11-7. “Test point diagram and voltage”, 1.
11-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. Check of power supply Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 208/230 VAC in the power supply terminal block? No Check the power supply cable. Yes Is the output voltage from the outdoor power P.C. board 294/325 VDC? Yes Replace the outdoor control P.C. board. No Turn OFF the power supply and recconnect the reactor. Is the reactor short-circuited? No Replace the reactor.
• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check miswiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. LED indication for communication status Communication status is indicated by the LED.
The cooling operation or heating operation does not operate. Check of R.V. coil :KHQ FRROLQJ RSHUDWLRQ GRHV QRW ZRUN 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode. Is there voltage of 208/230 VAC between pin1 and pin2 at connector CN712? No Yes Yes Turn OFF the power supply. Disconnect the connector CNAC2. Is there normal resistance No to R.V. coil? (Refer to 11-5.
• When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. Check of LEV Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Yes Is "click - click" sound heard? Or, do you feel vibration of LEV coil with your hand? CN791 CN792 CN793 CN794 CN795 Outdoor control P.C. board Normal No Disconnect the connectors.
• When heating, room does not get warm. • When cooling, room does not get cool. How to check inverter/compressor Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION. Measure the voltage between each lead wire leading to the compressor.
• 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.) (MXZ-3C24/3C30/4C36NA, Abnormal MXZ-3C24/3C30/4C36NA2) Replace the thermistor. (MXZ-5C42NA,MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ, MXZ-2C20/3C24/3C30NAHZ2) Normal Reconnect the connector in the following table and disconnect the lead wire leading to the compressor.
• Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor Disconnect CNF1 and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to right table) Yes Does the outdoor fan motor rotate smoothly? CNF1 No Replace the outdoor fan motor. Measuring points No Replace the outdoor fan motor. Voltage CNF1 Turn on the power supply to start operation and measure the voltage of connector CNF1.
• When the operation frequency does not go up from the lowest frequency. Check of HPS CN63H Outdoor control P.C. board 1. Disconnect the connector CN63H in the outdoor control P.C. board. 2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF. Infinity Check the resistance between each terminal. Replace HPS. Reconnect CN63H. Turn ON the power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.
MXZ-3C30NA 600 5HVLVWDQFH N MXZ-3C24NA MXZ-4C36NA Discharge temperature thermistor (RT62) 700 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 500 100 400 90 300 80 200 100 0 0 32 10 50 20 68 30 86 40 50 60 70 80 90 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
Discharge temperature thermistor (RT62) 700 600 5HVLVWDQFH N MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 500 100 400 90 300 80 200 100 0 0 32 10 50 20 68 30 86 40 50 60 70 80 90 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
MXZ-3C30NA2 600 5HVLVWDQFH N MXZ-3C24NA2 MXZ-4C36NA2 Discharge temperature thermistor (RT62) 700 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 500 100 400 90 300 80 200 100 0 0 32 10 50 20 68 30 86 40 50 60 70 80 90 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
600 MXZ-3C24NAHZ2 5HVLVWDQFH N MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C30NAHZ2 Discharge temperature thermistor (RT62) 700 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 500 100 400 90 300 80 200 100 0 0 32 10 50 20 68 30 86 40 50 60 70 80 90 100 110 120 (ºC) 104 122 140 158 176 194 212 230 248 (ºF) Temperature Thermistor R100 = 13.36 k ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
2. Outdoor power P.C. board Output to drive compressor (+) 15 V (-) (-) 15 V CN151 Signal transmission (To Outdoor control P.C. board) 5 VDC pulse wave MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 CN171 Fin temperature thermistor (RT64) (-) CN152 (+) Signal Transmission (From Outdoor Control P.C. board) 5 VDC pulse wave Connect to earth CNAC2 208/230 VAC Output F1 FUSE T6.3AL250V 208/230 VAC Input F2 FUSE T6.
2. Outdoor power P.C. board Output to drive compressor (+) 18 V (-) (-) 15 V 15 V CN171 Fin temperature thermistor (RT64) CN151 Signal transmission (To Outdoor control P.C. board) 5 VDC pulse wave MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 CNDC Bus-bar voltage 290 - 370 VDC CNAC1 Connect to earth 208/230 V Output F1 FUSE T6.3AL250V CN152 Signal Transmission (From Outdoor Control P.C.
12 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve (2) The terminal with this connector has the locking mechanism.
OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reactor and the outdoor power P.C. board Photo 4 Catches of the PB cover (1) Remove the top panel and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (3) Disconnect the connectors on the outdoor control P.C. board. (4) Remove the screws fixing the outdoor control P.C. board holder, and remove the outdoor control P.C. board. (5) Disconnect the lead wire from the reactor.
OPERATING PROCEDURE PHOTOS 3. Removing the fan motor (1) Remove the top panel, the service panel, and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. NOTE: The propeller fan nut is a revers thread. Photo 7 Propeller fan Screws of the outdoor fan motor Photo 8 4.
OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve Photo 9 (1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (Gas recovery is not required if the unit is pumped down.) Discharge pipe (3) Remove the LEV coils. brazed part (4) Detach the brazed parts of the expansion valves and pipes.
12-2. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Photos: MXZ-3C30NAHZ MXZ-3C30NAHZ2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the panels (1) Remove the screws fixing the top panel, and remove the top panel. (2) Remove the screws fixing the service panel. (3) Pull down the service panel, and remove the service panel. (4) Disconnect the power supply and indoor/outdoor connecting wire.
OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reactor and the outdoor power P.C. board (1) Remove the top panel, the service panel and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (3) Disconnect the connectors on the outdoor control P.C. board. (4) Remove the screws fixing the outdoor control P.C. board, and remove the outdoor control P.C. board.
OPERATING PROCEDURE PHOTOS 3. Removing the fan motor (1) Remove the top panel, the service panel, and the front panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (3) Disconnect the connector CNF1 on the outdoor control P.C. board. (4) Remove the propeller fan. (5) Remove the fan motor. NOTE: The propeller fan nut is a revers thread.
OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve (1) Remove the top panel, and the service panel (Refer to 1). (2) Disconnect the power supply and indoor/outdoor connecting wire. (Gas recovery is not required if the unit is pumped down.) (3) Remove the LEV coils. (4) Detach the brazed parts of expansion valves and pipes.
OBH702C 95
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2016. No. OBH702 REVISED EDITION-C Distributed in Feb. 2016. No. OBH702 REVISED EDITION-B Distributed in Oct. 2014. No. OBH702 REVISED EDITION-A Distributed in Sep. 2014. No. OBH702 Made in Japan New publication, effective Mar. 2016 Specifications are subject to change without notice.
