Service Manual

ManualsBrandsMitsubishi Manuals3 zone mini split systems25,000 BTU 20 SEER Tri Zone Heat Pump System 6+6+9

HFC

utilized

R410A

PARTS CATALOG (OBB702)

INDOOR UNIT

SERVICE MANUAL

OUTDOOR UNIT

Models

MXZ-2C20NA2

MXZ-3C24NA MXZ-3C24NA2

MXZ-3C30NA MXZ-3C30NA2

MXZ-4C36NA MXZ-4C36NA2

MXZ-5C42NA MXZ-5C42NA2

MXZ-2C20NAHZ MXZ-2C20NAHZ2

MXZ-3C24NAHZ MXZ-3C24NAHZ2

MXZ-3C30NAHZ MXZ-3C30NAHZ2

No. OBH702

REVISED EDITION-F

OBH702 REVISED EDITION-E is void.

Revision F:

• MXZ-2C20NA2-

has been added.

Indoor unit service manual

MSZ-FE·NA Series (OBH542)

MSZ-GE·NA Series (OBH548)

MFZ-KA·NA Series (OBH568)

SEZ-KD·NA Series

PLA-A·BA Series (OCH420)

PCA-A·KA Series (OCH455)

PEAD-A·AA Series

SLZ-KA·NA Series (OCH487)

MSZ-FH·NA Series (OBH683)

MVZ-A·AA Series

MSZ-GL·NA Series (OBH732)

MSZ-EF·NA Series (OBH736)

MFZ-KJ·NA Series (OBH752)

MXZ-3C24NA MXZ-3C24NA2

MXZ-3C30NA MXZ-3C30NA2

MXZ-4C36NA MXZ-4C36NA2

CONTENTS

1. TECHNICAL CHANGES ··································· 5

2. PART NAMES AND FUNCTIONS ····················· 6

3. SPECIFICATION ················································ 7

4. NOISE CRITERIA CURVES ···························· 15

5. OUTLINES AND DIMENSIONS ······················ 17

6. WIRING DIAGRAM ·········································· 23

7. REFRIGERANT SYSTEM DIAGRAM ············· 34

8. DATA ································································ 47

9. ACTUATOR CONTROL ··································· 76

10. SERVICE FUNCTIONS ···································· 77

11. TROUBLESHOOTING ····································· 79

12. DISASSEMBLY INSTRUCTIONS ·················· 102

Summary of content (114 pages)

PAGE 1
Revision F: • MXZ-2C20NA2- U1 has been added. OBH702 REVISED EDITION-E is void. OUTDOOR INDOOR UNIT UNIT HFC utilized SERVICE MANUAL No.
PAGE 2
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.
PAGE 3
MXZ-5C42NA Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Model type Model name 06 09 12 15 18 24 30 MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA2 Wall mounted MSZ-GE**NA MSZ-GL**NA-U1 MSZ-EF**NA-U1 MFZ-KA**NA Floor standing MFZ-KJ**NA-U1 SLZ-KA**NA.TH 4-way cassette PLA-A**BA6 PLA-A**EA7 SEZ-KD**NA4.TH Ceiling concealed PEAD-A**AA5 Ceiling suspended PCA-A**KA6.
PAGE 4
MXZ-3C24NA Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Model type Model name 06 09 12 15 18 24 30 MSZ-FE**NA MSZ-FH**NA MSZ-FH**NA2 Wall mounted MSZ-GE**NA MSZ-GL**NA-U1 MSZ-EF**NA-U1 MFZ-KA**NA Floor standing MFZ-KJ**NA-U1 SLZ-KA**NA.TH 4-way cassette PLA-A**BA6 PLA-A**EA7 SEZ-KD**NA4.TH Ceiling concealed PEAD-A**AA5 Ceiling suspended PCA-A**KA6.
PAGE 5
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.
PAGE 6
2 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 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 OBH702F 6
PAGE 7
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.
PAGE 8
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.
PAGE 9
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.
PAGE 10
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.
PAGE 11
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.
PAGE 12
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.
PAGE 13
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.
PAGE 14
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.
PAGE 15
NOISE CRITERIA CURVES 4 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 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.
PAGE 16
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 OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.
PAGE 17
5 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 1-3/16” 7-7/8” 9-7/16” Connecting wire hole 1-1/32” 13” 1/2” 14-3/16” 18-1/8 5-5/16” 1-25/32” 27-15/16” 2-19/32” Connecting wire hole LIQ GAS LIQ 3-5/16” GAS 29/32” Unit B
PAGE 18
Unit: inch (mm) MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 Conduit plates Conduit connector Lock nut OBH702F 18
PAGE 19
Unit: inch (mm) MXZ-4C36NA MXZ-4C36NA2 Conduit plates Conduit connector Lock nut OBH702F 19
PAGE 20
Unit: inch (mm) MXZ-5C42NA MXZ-5C42NA2 Conduit plate Top Lock nut OBH702F 20 Conduit connector Conduit plate Under
PAGE 21
Unit: inch (mm) MXZ-2C20NAHZ MXZ-2C20NAHZ2 Lock nut Conduit plate Conduit connector OBH702F 21
PAGE 22
Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702F 22
PAGE 23
6 WIRING DIAGRAM MXZ-2C20NA2 L WH RD CIRCUIT TB1 BREAKER WH RD TAB5 TAB6 IC501 MC U MS 3~ W BK WH VRD BK U WH V RD W X52C TAB4 TAB1 BK TAB3 BU IC411 IC402 TAB2 IC401 GNYN PTC1 L2 POWER SUPPLY 208/230V AC 60Hz F1 F2 PTC2 L1 GR 1 BK 3 BU CNMC D1 X65 CNAC1 OUTDOOR POWER P.C.
PAGE 24
MXZ-3C24NA MXZ-3C30NA OBH702F 24
PAGE 25
MXZ-3C24NA2 MXZ-3C30NA2 OBH702F 25
PAGE 26
MXZ-4C36NA OBH702F 26
PAGE 27
MXZ-4C36NA2 OBH702F 27
PAGE 28
MXZ-5C42NA L1 L2 WHT WHT RED TAB5 RED TAB3 TAB6 IC411 IC501 CIRCUIT TAB4 X52CA IC401 TB1 BREAKER TAB1 BLK L1 BLU L2 GRN/YLW GR X52CB TAB2 X65A BLK U WHT V RED W PTC1 PTC2 PTC3 TB6 F1 D1 F2 OUTDOOR POWER P.C. BOARD CB1 CB3 CB2 1 BLK 3 BLU GRY S3 12-24V S2 ~208/230V S1 BLU BLK CNAC1 CB4 V U MS W 3~ 1 7 CNF1 1 CNDC 1 3 7 CN702 BLK BLK CN171 2 1 1 CNAC 1 2 CN701 OUTDOOR CONTROL P.C.
PAGE 29
MXZ-5C42NA2 OBH702F 29
PAGE 30
MXZ-2C20NAHZ OBH702F 30
PAGE 31
MXZ-2C20NAHZ2 OBH702F 31
PAGE 32
MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702F 32
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MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702F 33
PAGE 34
REFRIGERANT SYSTEM DIAGRAM 7 MXZ-2C20NA2 Unit: inch (mm) Service port R.V. coil OFF ON Refrigerant flow in cooling Refrigerant flow in heating Compressor Discharge temperature thermistor RT62 Muffler Service port High pressure switch Union Indoor unit B ø 3/8 Indoor unit A ø 3/8 Stop valve with service port 4-way valve Sub Muffler Outdoor heat exchanger temperature thermistor RT68 HEX-OUT FAN-OUT Indoor unit A Union ø 1/4 Strainer #100 Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (ø4.
PAGE 35
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.
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MXZ-3C24NA MXZ-3C24NA2 MXZ-3C30NA MXZ-3C30NA2 R.V.
PAGE 37
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.
PAGE 38
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 Service port Union Header(Gas) Stop valve (with service port) ø 1/2 Indoor unit A Indoor unit B Indoor unit C Compressor shell temperature thermistor RT62 4-way valve ø 3/8 Sub muffler ø 3/8 Header (Evaporator) Outdoor heat exchanger ø 3/8 Indoor unit D Capillary tube O.D.0.16 x I.D.0.11 x 3.94 (ø4.0 x ø2.
PAGE 39
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.
PAGE 40
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 Compressor shell temperature thermistor RT62 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 ø 3/8 Outdoor heat exchanger Capillary tube O.D.0.10 x I.D.0.02 x 39.37 (ø2.5 x ø0.
PAGE 41
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.
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Unit: inch (mm) MXZ-2C20NAHZ R.V.coil OFF ON Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Oil separator Compressor shell temperature thermistor RT62 Service port High pressure switch Union Header(Gas) Service port ø 3/8 4-way valve Indoor unit A 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.
PAGE 43
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.
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Unit: inch (mm) MXZ-3C24NAHZ MXZ-3C30NAHZ R. V.
PAGE 45
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.
PAGE 46
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.
PAGE 47
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.
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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.
PAGE 49
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.
PAGE 50
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.
PAGE 51
8-1.
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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.
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8-2. CAPACITY AND THE INPUT CURVES MXZ-2C20NA2 9.6 11.7 11.4 6.2 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 1.3 Capacity correction factors Indoor air Wet-bulb temperature difference (°F) Cooling capacity 6.8 1.2 1.1 1.0 79 75 72 68 67 64 60 0.9 0.8 0.7 15 class 36.7 34.0 31.3 28.8 25.7 23.2 20.7 18.0 15.3 13.0 10.3 48.2 44.8 41.4 38.0 34.0 30.6 27.2 24.1 20.2 17.1 13.
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MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 06 class 09 class 12 class 15 class 18 class 24 class 1.2 1.1 1.0 0.8 0.7 Indoor intake air Wet-bulb temperature (°F) 9.6 11.7 11.4 14.5 13.2 1.3 6.2 8.8 10.7 10.5 13.2 12.1 1.2 5.7 8.0 9.7 9.5 12.0 10.9 5.1 7.2 8.
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MXZ-5C42NA MXZ-5C42NA2 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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 1.3 Capacity correction factors Indoor air Wet-bulb temperature difference (°F) Cooling capacity 6.8 1.2 1.1 1.0 79 75 72 68 67 64 60 0.9 0.8 0.
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MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 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 4.1 5.8 6.9 6.7 8.3 7.6 3.6 5.1 6.0 5.8 7.1 6.5 1.3 Capacity correction factors Indoor air Wet-bulb temperature difference (°F) Cooling capacity 6.8 1.2 1.1 1.0 0.9 0.8 0.
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8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2C20NA2) 1. 06-class unit in single operation 2.0 Total input Capacity 1.5 1.5 1.0 1.0 0.5 0.5 0 2.5 2.0 50 100 Frequency 0 150Hz 50 100 Frequency 150 Hz Total input Capacity 2.5 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 2. 09-class unit in single operation 2.0 Capacity Total input Capacity 2.
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(OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2) 1. 06-class unit in single operation Total input Capacity 2.0 2.0 1.5 1.5 1.5 1.0 1.0 1.0 0.5 0.5 0.5 2.0 Total input Capacity 2.5 2.0 1.5 1.0 0 50 100 Frequency 150Hz 0 50 100 Frequency 150 Hz 0 0.5 50 100 Frequency 150 Hz 0 50 100 Frequency 150 Hz 2. 09-class unit in single operation 2.0 Capacity Total input Capacity Total input 2.0 2.
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(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. 09-class unit in single operation 2.
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8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-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 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.
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2. 09-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 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.
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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 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.
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4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2) (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: 40 Hz 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.
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5. 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 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.
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6. 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. The switch is located on indoor unit.
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7. 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 70 120 6.0 Outdoor unit current (A) Outdoor low pressure (PSIG) 160 1. Set emergency switch to COOL or HEAT. The switch is located on indoor unit.
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8. 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.
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9. 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.
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10. 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.
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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 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.
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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 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.
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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 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.
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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 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.
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15. 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.
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16. 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.
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9 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 Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Outdoor heat exchanger temperature thermistor Capacity code OBH702F Purpos
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10 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 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 startup of the compressor. To improve start-up condition, the compressor is energized even while it is not operating.
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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.
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11 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 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.
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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.
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NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-4.). 3. Table of outdoor unit failure mode recall function 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.
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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.
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11-4. TROUBLESHOOTING CHECK TABLE No. Symptom 1 Outdoor unit does not operate. 2 Indication Abnormal point / Condition LED1(Red) LED2(Yellow) 3 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. Lighted 11 times Lighted 12 times Zero cross detecting circuit (Outdoor power P.C.
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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-3C24/3C30/ 11 times Not lighted 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.
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11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2C20NA2 MXZ-3C24NA MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NA2 MXZ-3C30NA2 MXZ-2C20NAHZ2 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) Fin temperature Measure the resistance with a tester. thermistor (RT64) Ambient temperature Refer to 11-7. “Test point diagram and voltage”, 1. ”Outdoor control P.C.board”, thermistor (RT65) 2. ”Outdoor power P.C.
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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 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.
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• 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.
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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 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.
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• 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.
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• 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.
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• 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-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.
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• 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) No Replace the outdoor fan motor. No Replace the outdoor fan motor. CNF1 Turn on the power supply to start operation and measure the voltage of connector CNF1.
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• 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.
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600 5HVLVWDQFH N MXZ-2C20NA2 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)/1.8 5HVLVWDQFH N 11-7.
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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.
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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.
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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.
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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) 5HVLVWDQFH N 1. Outdoor control P.C. board 60 50 40 Temperature Thermistor R100 = 13.
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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.
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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.
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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.
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12 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.
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OPERATING PROCEDURE PHOTOS 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.
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OPERATING PROCEDURE PHOTOS 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.
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OPERATING PROCEDURE PHOTOS Photo 11 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. LEV coils 6. Before using the service port (High pressure side) Photo 12 (1) Remove the service panel (Photo 1).
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12-2. 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 Photo 1 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. (4) Disconnect the power supply cord and indoor/outdoor connecting wires.
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OPERATING PROCEDURE PHOTOS 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 6). (4) Disconnect all the connectors on the outdoor control P.C. board.
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OPERATING PROCEDURE PHOTOS (13) Disengage all the catches of the PB cover, and remove the PB cover (Photo 10). (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 11) (15) Disengage all the catches of the outdoor power P.C. board, and lift the outdoor power P.C. board (Photo 11). (16) While lifting the outdoor power P.C.
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OPERATING PROCEDURE PHOTOS 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 15 Propeller fan Screws of the outdoor fan motor Photo 16 4.
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OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve Photo 18 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 Discharge pipe connecting wires. brazed part (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.
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12-3. 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 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.
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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 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.
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OPERATING PROCEDURE PHOTOS 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.
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OPERATING PROCEDURE PHOTOS 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.