Revision H: OUTDOOR UNIT • MSZ-FS·NA series have been added to INDOOR / OUTDOOR UNIT COMPATIBILITY TABLE. • 2. SAFETY PRECAUTION has been added. • 9-2. CAPACITY AND THE INPUT CURVES has been modified. • 12. TROUBLESHOOTING has been modified. OBH702 REVISED EDITION-G is void. HFC utilized SERVICE MANUAL REVISED EDITION-H R410A Models MXZ-2C20NA2 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 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.
INDOOR / OUTDOOR UNIT COMPATIBILITY TABLE Connectable indoor unit lineups (Heat pump inverter type) Model type Wall mounted Floor standing 4-way cassette Ceiling concealed Ceiling suspended Multi-position Model name MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA2 MSZ-FS**NA MSZ-GE**NA MSZ-GL**NA-U1 MSZ-EF**NA-U1 MFZ-KA**NA MFZ-KJ**NA-U1 SLZ-KA**NA.TH SLZ-KF**NA.TH PLA-A**BA6 PLA-A**EA7 SEZ-KD**NA4.TH PEAD-A**AA5 PCA-A**KA6.
Connectable indoor unit lineups (Heat pump inverter type) Model type Model name Wall mounted Floor standing 4-way cassette Ceiling concealed Ceiling suspended Multi-position MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA2 MSZ-FS**NA MSZ-GE**NA MSZ-GL**NA-U1 MSZ-EF**NA-U1 MFZ-KA**NA MFZ-KJ**NA-U1 SLZ-KA**NA.TH SLZ-KF**NA.TH PLA-A**BA6 PLA-A**EA7 SEZ-KD**NA4.TH PEAD-A**AA5 PCA-A**KA6.
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. MXZ-2C20NA2 - U1 1. New model 2 SAFETY PRECAUTION 2-1.
2-2. CAUTIONS RELATED TO R410A REFRIGERANT Cautions for units utilizing refrigerant R410A Make sure that the inside and outside of refrigerant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc., which are hazard to refrigerant cycle. In addition, use pipes with specified thickness. Use a vacuum pump with a reverse flow check valve. Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc.
[1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a siphon type.
2-3. Cautions for refrigerant piping work Refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is the same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
Tools for R410A (The following table shows whether conventional tools can be used or not.
3 PART NAMES AND FUNCTIONS MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 MXZ-4C36NA MXZ-4C36NA2 MXZ-2C20NA2 Air inlet (Back and side) Air inlet (Back and side) Air outlet Air outlet Drain outlet MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ Drain outlet MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 Air inlet (Back and side) Air outlet Drain outlet OBH702H 10
4 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.
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 5 MXZ-3C24NA MXZ-3C24NA2 MXZ-2C20NA2 FAN SPEED FUNCTION SPL(dB(A)) FAN SPEED FUNCTION SPL(dB(A)) LINE High Cooling 50 High Cooling 51 High Heating 54 High Heating 55 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.
6 OUTLINES AND DIMENSIONS MXZ-2C20NA2 Unit: inch (mm) 6-23/32” 23/32” Air Inlet 15/32” 11/16” Air Inlet Air Outlet 3-ø(1-5/16”) Drain hole (Bolt Pitch) 11/16” 12-3/8” 15-19/32” 19-11/16” 14-3/16” 8-5/32” 21/32” 1-11/32” 6-21/32” 2-9/16” 4-(13/32”×13/16”) Oval Hole (Foundation Bolt M8) 33-1/16” Handle 1-1/32” 9-7/16” Connecting wire hole 13” 1/2” 2-19/32” 27-15/16” 14-3/16” 18-1/8 5-5/16” 1-25/32” 3-5/16” 1-3/16” 7-7/8” Connecting wire hole LIQ GAS LIQ GAS 29/32” Unit B Uni
Unit: inch (mm) MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 Conduit plates Conduit connector Lock nut OBH702H 22
Unit: inch (mm) MXZ-4C36NA MXZ-4C36NA2 Conduit plates Conduit connector Lock nut OBH702H 23
Unit: inch (mm) MXZ-5C42NA MXZ-5C42NA2 Conduit plate Top Lock nut OBH702H 24 Conduit connector Conduit plate Under
Unit: inch (mm) MXZ-2C20NAHZ MXZ-2C20NAHZ2 Lock nut Conduit plate Conduit connector OBH702H 25
Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702H 26
7 WIRING DIAGRAM MXZ-2C20NA2 L WH RD WH RD TAB5 TAB6 IC501 MC U MS 3~ W BK WH VRD BK U WH V RD W TAB4 X52C TAB3 TAB1 BU IC411 IC402 IC401 TAB2 PTC1 CNMC OUTDOOR POWER P.C.
MXZ-3C24NA MXZ-3C30NA OBH702H 28
MXZ-3C24NA2 MXZ-3C30NA2 OBH702H 29
MXZ-4C36NA OBH702H 30
MXZ-4C36NA2 OBH702H 31
MXZ-5C42NA L1 L2 WHT WHT RED TAB5 RED TAB3 TAB6 TAB4 IC411 IC501 IC401 U WHT V RED W L1 BLU L2 GRN/YLW GR PTC1 POWER SUPPLY 208/230V 1 phase 60Hz PTC2 PTC3 TB6 D1 1 7 CNF1 MC 1 CNDC 1 3 7 CN702 BLU TBE3 TBE4 CNAC2 3 BLK 1 BLK TBE1 TBE2 BLK CN152 1 2 CN171 2 1 1 CNAC 1 2 CN701 5 3 CN622 F711 1 3 CN741 1 LED1 CNTH1 1 8 (BLK) CN795 5 CNTH2 1 2 1 5 t° t° RT61 RT62 SYMBOL CB1~4 D1 F1, F2 F711 HPS IC401 IC411 IC501 IC801 PTC1~3 RT61 RT62 RT64 RT65 RT68 t° RT68
MXZ-5C42NA2 OBH702H 33
MXZ-2C20NAHZ OBH702H 34
MXZ-2C20NAHZ2 OBH702H 35
MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702H 36
MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702H 37
REFRIGERANT SYSTEM DIAGRAM 8 MXZ-2C20NA2 Unit: inch (mm) Service port Refrigerant flow in cooling Refrigerant flow in heating High pressure switch Union Indoor unit B ø 3/8 Indoor unit A ø 3/8 Indoor unit A Indoor unit B Compressor Discharge temperature thermistor RT62 Muffler Service port Stop valve with service port 4-way valve Sub Muffler Outdoor heat exchanger temperature thermistor RT68 Union ø 1/4 Strainer #100 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (ø4.0 x ø2.
Operating Range MXZ-2C20NA2 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-2C20NA2 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. It is irrelevant which unit is higher.
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) ø 1/2 Compressor shell temperature thermistor RT62 4-way valve ø 3/8 Sub muffler ø 3/8 Header (Evaporator) Outdoor heat exchanger ø 3/8 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.
Unit: inch (mm) MXZ-5C42NA R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Union Indoor unit A Indoor unit B Indoor unit C Service port High pressure switch Service port Header(Gas) ø 1/2 4-way valve ø 3/8 Stop valve (with service port) ø 3/8 ø 3/8 Header(Evaporator) 2-way solenoid valve Indoor unit D Indoor unit E Compressor shell temperature thermistor RT62 ø 3/8 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.
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.
Unit: inch (mm) MXZ-2C20NAHZ R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Compressor shell temperature thermistor RT62 Service port High pressure switch Union Indoor unit A Header(Gas) Service port ø 3/8 4-way valve Stop valve (with service port) Header(Evaporator) 2-way solenoid valve ø 3/8 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.
Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C30NAHZ R. V. coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port Compressor shell temperature thermistor RT62 Oil separator High pressure switch Union Indoor unit A Header(Gas) Service port ø 1/2 4-way valve Stop valve (with service port) ø 3/8 Indoor unit B Header(Evaporator) 2-way solenoid valve ø 3/8 Indoor unit C Outdoor heat exchanger temperature thermistor RT68 Capillary tube O.D.0.16 x I.D.0.11 x 3.
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.
9 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 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.
9-1.
MXZ-2C20NA2 MXZ-5C42NA MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-3C30NA MXZ-4C36NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 The standard specifications apply only to the operation of the air conditioner under normal conditions.
8.8 10.7 10.5 5.7 8.0 9.7 9.5 5.1 7.2 8.7 8.5 4.6 6.5 7.8 7.6 4.1 5.8 6.9 6.7 3.6 5.1 6.0 5.8 Capacity correction factors 6.2 Cooling capacity 1.3 1.2 1.1 1.0 79 75 72 68 67 64 60 0.9 0.8 0.7 Indoor intake air Wet-bulb temperature (°F) 14 15 class 11.4 12 class 9.6 11.7 09 class 6.8 06 class Indoor air Wet-bulb temperature difference (°F) 9-2. CAPACITY AND THE INPUT CURVES MXZ-2C20NA2 24 34 44 54 74 84 94 104 114 Total input (Cooling) 1.
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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 Cooling capacity 1.3 1.2 1.1 1.0 0.9 0.8 0.7 Indoor intake air Wet-bulb temperature (°F) 14 24 class 8.8 10.7 18 class 6.2 15 class 13.2 12 class 11.4 14.5 09 class 9.6 11.7 MXZ-4C36NA MXZ-4C36NA2 Capacity correction factors MXZ-3C30NA MXZ-3C30NA2 6.
10.5 13.2 12.1 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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 Capacity correction factors 8.8 10.7 5.7 Cooling capacity 1.3 1.2 1.1 1.0 0.8 0.7 Indoor intake air Wet-bulb temperature (°F) 14 24 34 44 54 64 74 84 94 104 114 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) Input correction factors 1.3 1.2 1.1 1.0 Indoor intake air Wet-bulb temperature (°F) 0.7 0.6 0.5 0.4 31.
10.5 13.2 12.1 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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 Capacity correction factors 8.8 10.7 5.7 Cooling capacity 1.3 1.2 1.1 1.0 0.9 0.8 0.7 Indoor intake air Wet-bulb temperature (°F) 14 24 class 6.2 18 class 13.2 15 class 11.4 14.5 12 class 9.6 11.7 09 class 6.
9-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2C20NA2) 1. 06-class unit in single operation Capacity 2.0 Total input 2.0 1.5 2.5 1.5 1.0 1.0 0.5 0.5 0 50 100 Frequency 0 150Hz 2. 09-class unit in single operation Capacity 2.0 2.0 50 100 Frequency 150 Hz Total input 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0 2.0 1.5 1.5 1.0 1.0 1.0 0.5 0.5 0.5 0 50 100 Frequency 150 Hz 0 Capacity 2.
(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 2. 09-class unit in single operation 2.0 Capacity 2.0 50 100 Frequency 150 Hz Total input 0 2.0 0.5 50 100 Frequency 150 Hz Capacity 0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.
(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 Total input Capacity Total input Capacity 2.0 2.0 1.5 1.5 1.5 1.5 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 2.0 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 50 100 Frequency 2.0 150 Hz 0 50 100 Frequency 150 Hz 2.
9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 Hz (HEAT). 4.
2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 Hz (HEAT). 4. Indoor fan runs at High speed and continues for 30 minutes. 5.
3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2) (1) COOL operation Data is based on the condition of indoor humidity 50% Air flow speed: High Inverter output frequency: 40 Hz 160 6.0 perat lb tem y-bu or Dr Indo F) ure (˚ 86 80 150 75 140 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3.
4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 40 Hz 160 mpe ulb te ry-b oor D Ind 6.0 ) (˚F rature 86 5.0 80 150 75 140 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2. Press emergency run ON/OFF button. 3.
5. 06-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 24 Hz Ind temp 5.0 80 140 75 130 70 120 4.0 or Indo lb te bu Dry- ) re (˚F ratu mpe 86 80 75 70 24 Hz 3.0 2.0 24 Hz 1.0 110 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.
6. 09-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 24 Hz Ind temp 5.0 80 140 75 130 70 120 4.0 or Indo lb te bu Dry- ) re (˚F ratu mpe 86 80 75 70 24 Hz 3.0 2.0 24 Hz 1.0 110 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.
7. 12-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation Outdoor low pressure (PSIG) 160 86 150 ry-bu rD Indoo ature per lb tem (˚F) 80 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.
8. 15-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 24 Hz 160 6.0 rature mpe ulb te y-b or Dr Indo (˚F) 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2.
9. 18-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 24 Hz 160 6.0 y-b or Dr Indo rature mpe ulb te (˚F) 86 5.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 170 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2.
10. 24-class unit in single operation (OUTDOOR UNIT: MXZ-3C30NA MXZ-4C36NA MXZ-3C30NA2 MXZ-4C36NA2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 24 Hz Outdoor low pressure 170 ry-bulb D Indoor ˚F) ature ( r tempe 7.0 86 6.0 80 160 150 75 140 70 Outdoor unit current (A) (PSIG) 180 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit. 2.
11. 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 ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz Outdoor low pressure 160 ry or D Indo 6.0 86 rat mpe te -bulb ˚F) ure ( 5.0 80 150 75 140 70 Outdoor unit current (A) (PSIG) 170 1.
12. 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 ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz Outdoor low pressure 160 ry or D Indo 6.0 86 rat mpe te -bulb ˚F) ure ( 5.0 80 150 75 140 70 Outdoor unit current (A) (PSIG) 170 1.
13. 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 ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz Outdoor low pressure 160 ry or D Indo 6.0 86 rat mpe te -bulb ˚F) ure ( 5.0 80 150 75 140 70 Outdoor unit current (A) (PSIG) 170 1.
14. 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 ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz l ry-bu or D Indo (˚F) 160 150 75 140 70 4.0 re atu per 5.0 80 130 6.0 86 ) (˚F bu ry- D oor em lb t 86 80 75 70 Ind 18 Hz 3.0 2.0 1.0 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.
15. 18-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz l ry-bu or D Indo (˚F) 160 150 75 140 70 4.0 re atu per 5.0 80 130 6.0 86 ) (˚F bu ry- D oor em lb t 86 80 75 70 Ind 18 Hz 3.0 2.0 1.0 18 Hz 120 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.
16. 24-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-3C30NAHZ2) (1) COOL operation ata is based on the condition of indoor humidity D 50% Air flow speed: High Inverter output frequency: 18 Hz 180 l ry-bu or D Indo 6.0 (˚F) 86 80 170 75 160 70 150 140 4.0 re atu per 5.0 ) (˚F bu ry- D oor em lb t 86 80 75 70 Ind 18 Hz 3.0 2.0 1.0 18 Hz 130 65 70 75 80 85 90 95 100 105 110 115 (˚F) 0.
10 ACTUATOR CONTROL MXZ-2C20NA2 MXZ-5C42NA MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-3C30NA MXZ-4C36NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 Relation between main sensor and actuator Actuator 2-way solenoid valve Sensor Purpose Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Protection Cooling: Coil frost prevention Heating: High pressure protection Heating: Defrosting Fin temperature thermistor
11 SERVICE FUNCTIONS MXZ-2C20NA2 MXZ-5C42NA MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-3C30NA MXZ-4C36NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 11-1. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the startup of the compressor. To improve start-up condition, the compressor is energized even while it is not operating.
11-2. AUTO LINE CORRECTING Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping. Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 20 minutes. [How to activate this function] 1. Check that outside temperature is above 32˚F.
12 TROUBLESHOOTING MXZ-2C20NA2 MXZ-5C42NA MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-3C30NA MXZ-4C36NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 12-1. 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: B linking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-4.). 3. Table of outdoor unit failure mode recall function The left lamp of Abnormal point OPERATION IN(Failure mode/protection) DICATOR lamp (Indoor unit) OFF None (Normal) 2-time blink Outdoor power system 3-time blink 4-time blink 5-time blink 6-time blink 7-time blink LED indication (Outdoor P.C.
12-3. 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 12-4. "TROUBLESHOOTING CHECK TABLE". Refer to 12-6. "Check of power supply". • Indoor unit serial signal error Refer to 12-6.
12-4. TROUBLESHOOTING CHECK TABLE No. Symptom 1 Outdoor unit does not operate. 2 Indication Abnormal point / Condition LED1(Red) LED2(Yellow) Lit Once Lit Twice Lit 3 times Lit 4 times 3 4 5 Lit 5 times Lit 6 times 6 7 8 Lit 7 times Lit 8 times 9 12 13 14 15 'Outdoor unit stops and restarts 3 minutes later' is 16 repeated. • Refer to 12-6. "Check of outdoor thermistors". • Refer to 12-6. "Check of outdoor thermistors". • Replace the outdoor control P.C. board.
No. 22 23 24 25 26 27 28 29 30 31 Indication Abnormal point / ConCondition dition LED1(Red) LED2(Yellow) Low out side tempera'Outdoor unit The ambient became 10.4°F or less. stops and ture protection(cooling) restarts The ambient became 1.4°F or less. (MXZ-3C24/3C30/ 11 times Not lit 3 minutes Low out side tempera- 4C36/5C42NA, MXZ-3C24/3C30/4C36/5C42NA2) later' is ture protection(Heating) The ambient became -18°F or less. (MXZ-2C20/ repeated.
12-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2C20NA2 MXZ-5C42NA MXZ-3C24NA2 MXZ-2C20NAHZ2 MXZ-3C24NA MXZ-2C20NAHZ MXZ-3C30NA2 MXZ-3C24NAHZ2 MXZ-3C30NA MXZ-4C36NA MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-4C36NA2 MXZ-5C42NA2 MXZ-3C30NAHZ2 Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature Refer to 12-7. “TEST POINT DIAGRAM AND VOLTAGE”, 1. ”Outdoor control P.C.board”, thermistor (RT64) 2. ”Outdoor power P.C. board”, for the chart of thermistor.
12-6. 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 V AC 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 V DC? 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 blinks 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) LED indication for communication status Turn OFF the power supply. Communication status is indicated by the LED.
The cooling operation or heating operation does not operate. Check of R.V. coil • 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 pin2 at connector CN712? No Is there voltage 208/230 V AC between the pin1 and pin3 at connector CNAC? Yes Yes Turn OFF the power supply. Disconnect the connector CNAC2.
• 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? Normal CN791 CN792 CN793 CN794 CN795 CN797 Outdoor control P.C. board 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 12-7.) (MXZ-3C24/3C30/4C36NA, Abnormal MXZ-3C24/3C30/4C36NA2) Replace the thermistor. (MXZ-5C42NA,MXZ-2C20/5C42NA2, 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 CNF1 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? No Replace the outdoor fan motor. 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. 0Ω Replace HPS. Reconnect CN63H. Turn ON the power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.
600 Resistance (kΩ) MXZ-2C20NA2 Discharge temperature thermistor (RT62) 700 500 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 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 kΩ ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.8 Resistance (kΩ) 12-7.
MXZ-3C30NA 600 Resistance (kΩ) MXZ-3C24NA MXZ-4C36NA Discharge temperature thermistor (RT62) 700 500 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 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 kΩ ± 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 Resistance (kΩ) MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 500 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 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 kΩ ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
MXZ-3C30NA2 600 Resistance (kΩ) MXZ-3C24NA2 MXZ-4C36NA2 Discharge temperature thermistor (RT62) 700 500 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 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 kΩ ± 2% , B constant = 4014 ± 2% 1 1 Rt = 13.36exp{4014( 273+t 373 )} , t: ºC = (ºF - 32)/1.
600 MXZ-3C24NAHZ2 Resistance (kΩ) MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C30NAHZ2 Discharge temperature thermistor (RT62) 700 500 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 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) Resistance (kΩ) 1. Outdoor control P.C. board 60 50 40 Temperature Thermistor R100 = 13.
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-2C20NA2 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 (+) 15 V (-) (-) 15 V CN151 Signal transmission (To Outdoor control P.C. board) 5 V DC 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 V AC Output F1 FUSE T6.3AL250V 208/230 V AC 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 V DC pulse wave MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 CNDC Bus-bar voltage 290 - 370 V DC CNAC1 Connect to earth 208/230 V Output F1 FUSE T6.3AL250V CN152 Signal Transmission (From Outdoor Control P.C.
13 DISASSEMBLY INSTRUCTIONS The terminal which has the locking mechanism can be detached as shown below. There are following 2 types 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 the connector shown below has the locking mechanism.
OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the outdoor power P.C. board and the reactor (1) Remove the service panel (Photo 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove the top panel, the cabinet, and the back panel (Photo 1, 2, 3). (4) Disconnect all the connectors and the lead wires on the outdoor control P.C. board. (5) Disengage all the catches of the outdoor control P.C. board, and remove the outdoor control P.C. board.
OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor (1) Remove the service panel (Photo 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove the top panel, the cabinet, and the back panel (Photo 1, 2, 3). (4) Disconnect the connectors of CN712, CNF1, CNTH1, CNTH2, CN63H, CN791, CN792, CN793, CN794, CN797 on the outdoor control P.C. board and disconnect the relay connector of the compressor lead wire.
OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve Photo 11 NOTE: Gas recovery is not required if the unit is pumped down. (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove all the LEV coils. (4) Detach all the brazed parts of the expansion valves and pipes. LEV coils 6. Before using the service port (High pressure side) Photo 12 (1) Remove the service panel (Photo 1).
13-2. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 Photos: MXZ-4C36NA MXZ-4C36NA2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panels Photo 1 (1) Remove all the screws fixing the top panel, and remove the top panel. (2) Remove all the screws fixing the service panel. (3) Pull down on the service panel, and remove the service panel. (4) Disconnect the power supply cord and indoor/outdoor connecting wires.
OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the reactor, the outdoor power P.C. board, and the heatsink (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the wire-to-wire connector of the compressor lead wire (Photo 4). (4) Disconnect all the connectors on the outdoor control P.C. board.
OPERATING PROCEDURE PHOTOS/FIGURES (13) Disengage all the catches of the PB cover, and remove the PB cover (Photo 9). (14) Remove the screw fixing the outdoor power P.C. board and all the screws fixing the outdoor power P.C. board and the heatsink. (Photo 10) (15) Disengage all the catches of the outdoor power P.C. board, and lift the outdoor power P.C. board (Photo 10). (16) While lifting the outdoor power P.C.
OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor (1) Remove the top panel, the service panel, and the front panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the connector of 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 reverse thread. Photo 14 Propeller fan Screws of the outdoor fan motor Photo 15 4.
OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve NOTE: Gas recovery is not required if the unit is pumped down. (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove all the LEV coils. NOTE: When reassembling, to secure the LEV coils on the pipe, make sure to use the metal clips for proper positioning. (4) Detach all the brazed parts of the expansion valves and pipes.
13-3. 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/FIGURES 1. Removing the panels (1) Remove all the screws fixing the top panel, and remove the top panel. (2) Remove all the screws fixing the service panel. (3) Pull down on the service panel, and remove the service panel.
OPERATING PROCEDURE PHOTOS/FIGURES 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 section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect all the connectors on the outdoor control P.C. board. (4) Remove all the screws fixing the outdoor control P.C. board, and remove the outdoor control P.C. board.
OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor (1) Remove the top panel, the service panel, and the front panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Disconnect the connector of 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 reverse thread.
OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve NOTE: Gas recovery is not required if the unit is pumped down. (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove all the LEV coils. (4) Detach all the brazed parts of the expansion valves and pipes.
