Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MXZ-2D33VA
MXZ-2D40VA
MXZ-2D42VA
MXZ-2D53VA
MXZ-2D53VAH
MXZ-3D54VA
MXZ-3D54VA2
MXZ-3D68VA
MXZ-4D72VA
MXZ-4D83VA
MXZ-5D102VA
MXZ-6D122VA
MXZ-2D33VA
MXZ-2D40VA
MXZ-2D42VA
MXZ-2D53VA MXZ-2D53VAH
NOTE:
RoHS compliant products have <G> mark
on the spec name plate.
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Revision H:
• MXZ-6D122VA-
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Please void OBH626 REVISED EDITION-G.
HFC
utilized
R410A
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ET3
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ET3
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Indoor unit service manual
ER3
MSZ-EF•VE Series (OBH589)
MSZ-GF•VE Series (OBH634)
MSZ-SF•VA Series (OBH555)
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ET3
MSZ-SF•VE Series (OBH600)
MSZ-FH•VE Series (OBH623)
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MFZ-KA•VA Series (OB409)
MFZ-KJ•VE Series (OBH666)
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MLZ-KA•VA Series (OBH483)
SLZ-KA•VA Series (OC320)
SEZ-KD•VA Series (HWE07110)
PLA-RP•BA Series (OCH412)
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PCA-RP•KA Series (OCH454)
PEAD-RP•JA Series (HWE08130)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 6
3. SPECIFICATION ················································ 7
4. NOISE CRITERIA CURVES ···························· 17
5. OUTLINES AND DIMENSIONS ······················ 20
6. WIRING DIAGRAM ·········································· 25
7. REFRIGERANT SYSTEM DIAGRAM ············· 71
8. PERFORMANCE CURVES ····························· 81
9. ACTUATOR CONTROL ··································115
10. SERVICE FUNCTIONS ···································116
11. TROUBLESHOOTING ··································· 122
12. DISASSEMBLY INSTRUCTIONS ·················· 161
INDOOR UNITS COMBINATION SHEETS
PARTS CATALOG (OBB626)
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have been added.
ER1
ET1
No. OBH626
REVISED EDITION-H
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MXZ-2D33VA-E1
Summary of Contents for Mitsubishi Electric MXZ-2D33VA-E1
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Page 1: Outdoor Unit
Revision H: • MXZ-6D122VA- have been added. Please void OBH626 REVISED EDITION-G. OUTDOOR UNIT No. OBH626 REVISED EDITION-H utilized SERVICE MANUAL R410A Models MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH Indoor unit service manual MSZ-EF•VE Series (OBH589) MXZ-3D54VA MSZ-GF•VE Series (OBH634) MSZ-SF•VA Series (OBH555) MXZ-3D54VA2 MSZ-SF•VE Series (OBH600) MXZ-3D68VA... -
Page 2: Technical Changes
Use the specifi ed 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. - Page 3 MXZ-2C40VA - MXZ-2D40VA - MXZ-2C52VA - MXZ-2D53VA - 1. Grill has been changed. 2. Ice guard has been added. 3. Electrical parts have been changed. 4. Fan motor has been changed. 5. Indoor units combinations have been added. MXZ-2C52VA - MXZ-2D53VAH - 1.
- Page 4 MXZ-2D40VA - 1. New model MXZ-2D33VA - MXZ-2D42VA - MXZ-2D53VA - MXZ-3D54VA2 - MXZ-3D68VA - MXZ-4D72VA - MXZ-4D83VA - MXZ-5D102VA - 1. New model MXZ-2D33VA - MXZ-2D33VA - MXZ-2D42VA - MXZ-2D42VA - MXZ-2D53VA - MXZ-2D53VA - MXZ-2D53VAH - MXZ-2D53VAH - 1.
- Page 5 MXZ-3D68VA - MXZ-3D68VA - MXZ-4D72VA - MXZ-4D72VA - 1. Outdoor control P.C. board has been changed. 2. High pressure switch has been changed. MXZ-3D54VA2 - MXZ-3D54VA2 - 1. High pressure switch has been added. 2. Outdoor control P.C. board has been changed. MXZ-3D68VA - MXZ-3D68VA - MXZ-4D72VA -...
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Page 6: Part Names And Functions
PART NAMES AND FUNCTIONS MXZ-2D33VA MXZ-3D54VA MXZ-2D40VA MXZ-3D54VA2 MXZ-2D42VA MXZ-3D68VA MXZ-2D53VA MXZ-4D72VA MXZ-2D53VAH Air inlet Air inlet (Back and side) (Back and side) Piping Drain hose Air outlet Air outlet Drain outlet Drain outlet MXZ-4D83VA MXZ-6D122VA MXZ-5D102VA Air inlet Air inlet (Back and side) (Back and side) Air outlet... -
Page 7: Specification
SPECIFICATION Outdoor model MXZ-2D33VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number Piping total length Max. 20 Connecting pipe length Max. 15 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. - Page 8 Outdoor model MXZ-2D40VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 9 Outdoor model MXZ-2D42VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 10 Outdoor model MXZ-2D53VA MXZ-2D53VAH Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 11 Outdoor model MXZ-3D54VA MXZ-3D54VA2 Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 3 Piping total length Max. 50 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 12 Outdoor model MXZ-3D68VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 3 Piping total length Max. 60 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 13 Outdoor model MXZ-4D72VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 4 Piping total length Max. 60 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 14 Outdoor model MXZ-4D83VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 4 Piping total length Max. 70 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 15 Outdoor model MXZ-5D102VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 5 Piping total length Max. 80 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
- Page 16 Outdoor model MXZ-6D122VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 6 Piping total length Max. 80 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
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Page 17: Noise Criteria Curves
NOISE CRITERIA CURVES MXZ-2D33VA MXZ-2D40VA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling High Heating High Heating NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF NC-20 NC-20 HEARING FOR HEARING FOR... - Page 18 MXZ-3D54VA MXZ-3D68VA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling MXZ-3D54VA2 High Heating High Heating NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 NC-20 HEARING FOR CONTINUOUS...
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Page 19: Table Of Contents
MXZ-5D102VA MXZ-6D122VA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling High Heating High Heating NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS... -
Page 20: Outlines And Dimensions
OUTLINES AND DIMENSIONS MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH Unit: mm OBH626H... - Page 21 MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA Unit: mm Liquid pipe : Ø6.35(flared)1/4 C unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 B unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 A unit connection Gas pipe : Ø9.52(flared)3/8 1.Installation space Note : Leave front and both sides 100 or more free of obstruction.
- Page 22 MXZ-4D72VA Unit: mm Liquid pipe : Ø6.35(flared)1/4 D unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 C unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 B unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 A unit connection Gas pipe : Ø12.7(flared)1/2...
- Page 23 MXZ-4D83VA MXZ-5D102VA Unit: mm 2-U Shaped notched hole (Fondation bolt M10) Air in Air in Drain hole 42 Air out 2-12 x 36 Oval hole (Fondation bolt M10) Handle Indoor and outdoor connect wiring (35 x 53) hole Handle Liquid pipe : Ø6.35(flared)1/4 E unit connection (MXZ-5D102VA) Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4...
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Page 24: Service Space
MXZ6D122VA Unit: mm Air in 2-U Shaped Notched Hole (Foundation Bolt M10) Air in 6-ø33 Drain Hole Air out 2-12×36 Oval Hole (Foundation Bolt M10) Handle Handle Handle Handle Handle F unit Liquid pipe : Ø6.35(flared)1/4 connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 E unit connection... -
Page 25: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MXZ-2D33VA UNIT: mm Compressor Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Muffler Indoor unit 4-way valve Stop valve Sub muffler (with service port) Indoor unit Outdoor heat Stop valve exchanger (with service port) temperature thermistor... -
Page 26: Max Refrigerant Piping Length
MXZ-2D40VA UNIT: mm Compressor Discharge temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Muffler Indoor unit 4-way valve Stop valve Sub muffler (with service port) Indoor unit Outdoor heat Stop valve exchanger (with service port) temperature thermistor RT68 FAN-OUT Ambient... - Page 27 MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH UNIT: mm Compressor Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Muffler Indoor unit 4-way valve Stop valve Sub muffler (with service port) Indoor unit Outdoor heat Stop valve exchanger (with service port) temperature thermistor RT68...
- Page 28 MXZ-3D54VA MXZ-3D54VA2 UNIT: mm High-pressure switch Compressor (MXZ-3D54VA2- only) Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Oil separator Capillary tube Refrigerant flow in heating 4-way valve Indoor unit Stop valve with service port Indoor unit Muffler Indoor unit Outdoor heat exchanger temperature...
- Page 29 MXZ-3D68VA UNIT: mm Compressor High-pressure switch Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Oil separator Capillary tube Refrigerant flow in heating 4-way valve Indoor unit Stop valve with service port Indoor unit Muffler Indoor unit Outdoor heat exchanger temperature FAN-OUT...
- Page 30 MXZ-4D72VA UNIT: mm Compressor High-pressure switch Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator Capillary tube Indoor unit 4-way valve Stop valve with service port Indoor unit Indoor unit Muffler Indoor unit Outdoor heat exchanger temperature...
- Page 31 UNIT: mm MXZ-4D83VA Compressor High-pressure switch Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator Capillary tube Indoor unit Stop valve (with service port) 4-way valve Indoor unit Indoor unit Muffler Indoor unit FAN-OUT Outdoor Ambient...
- Page 32 MXZ-5D102VA UNIT: mm Compressor High-pressure Discharge R.V. coil switch temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator Capillary tube Indoor unit Stop valve (with service port) 4-way valve Indoor unit Indoor unit Muffler Indoor unit FAN-OUT Indoor unit Outdoor...
- Page 33 MXZ-6D122VA UNIT: mm Accumulator Compressor R.V.coil Compressor shell Refrigerant flow in heating temperature Refrigerant flow in cooling Oil separator thermistor RT62 High pressure switch Union Header(Gas) Ø12.7 Charge pipe Indoor unit A 4-way valve Ø9.52 Indoor unit B Stop valve Header(Evaporator) Ø9.52 (with service port)
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Page 34: Pumping Down
PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refriger- ant 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. -
Page 35: Actuator Control
ACTUATOR CONTROL MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA Relation between main sensor and actuator Actuator Sensor Purpose Outdoor Defrost Compressor R.V. coil fan motor heater 1 Discharge temperature thermistor Protection Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Defrost thermistor... -
Page 36: Service Functions
SERVICE FUNCTIONS MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA 10-1. THE POSITION OF SWITCH MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH 1 2 3 4 5 6 Outdoor display P.C. board MXZ-6D122VA MXZ-3D54/3D68/4D72VA MXZ-4D83/5D102VA MXZ-3D54VA2 1 2 3 4 5 6 SW871 Outdoor control P.C. - Page 37 10-3. LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT With this function, you can lower the operating noise of the outdoor unit when the operation load is small, for example, during night time in COOL mode. However, note that the cooling and heating capacity can also be lowered if this function is activated. Default setting is required to activate this function.
- Page 38 The record of automatic line correcting can be checked in the following way: (1) Turn OFF the power supply and make sure that the LED goes off. (2) Turn ON the "3" of SW2 on the outdoor display P.C. board. (3) Turn ON the power supply.
- Page 39 <MXZ-6D122VA> 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.
- Page 40 10-5. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the start-up of the compressor. To improve start-up condition, the compressor is energized even while it is not operating to generate heat at the winding. The compressor uses about 50 W when pre-heat control is turned ON.
- Page 41 10-6. CHANGING THE AMPERE LIMIT With this function, you can change the current that flows in the outdoor unit. NOTE: Use this function only when the amount of current exceeds the allowed value. [How to change the ampere limit] MXZ-4D83VA/5D102VA (1) Turn OFF the power supply and make sure that the LED goes off.
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Page 42: Troubleshooting
TROUBLESHOOTING MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the unit fi... - Page 43 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. 1 Regardless of normal or abnormal condition, 2 short Make sure that the remote controller is set to the failure mode recall function.
- Page 44 3. Outdoor unit failure mode table MXZ-2D Upper or LED indication Indoor/ left lamp of (Outdoor P.C. board) outdoor OPERATION Abnormal point unit failure LED 1 LED 2 Condition Remedy INDICATOR (Failure mode/protection) mode lamp (Indoor recall unit) function None (Normal) Not lighted Not lighted —...
- Page 45 MXZ-3D/4D/5D LED indication Upper or left lamp of Indoor/outdoor Abnormal point OPERATION INDICATOR Condition Remedy (Outdoor P.C. board) unit failure mode (Failure mode/protection) lamp (Indoor unit) recall function LED 1 LED 2 None (Normal) Lighted Lighted Outdoor power system 2-time flash Lighted Lighted Overcurrent protection cut-out operates of the compressor...
- Page 46 LED indication Upper or left lamp of Indoor/outdoor Abnormal point (Outdoor P.C. board) Condition Remedy OPERATION INDICATOR unit failure mode (Failure mode/protection) recall function lamp (Indoor unit) LED 1 LED 2 Communication error 11-time flash Communication error occurs Lighted 6 times Check the connecting between P.C.
- Page 47 MXZ-6D LED indication The left lamp of Indoor/ (Outdoor P.C. OPERATION IN- Abnormal point outdoor unit Condition Remedy board) DICATOR lamp (Failure mode/protection) failure mode (Indoor unit) recall function LED 1 LED 2 None (Normal) Lighted Lighted 2-time fl ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates 3 con- •...
- Page 48 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.
- Page 49 11-4. TROUBLESHOOTING CHECK TABLE MXZ-2D Indication Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit Refer to 11-6. "Check of LEV". The indoor unit detects an abnormality in the LEV and drain pump. Lighted Once LEV and drain pump does not Check the drain pump of the indoor unit.
- Page 50 Indication No. Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit This symptom does not mean any abnormality of the operates. product, but check the following points. Cooling high-pressure 5 times Lighted The outdoor heat exchanger temperature exceeds 58°C during operation. Check if indoor filters are clogged.
- Page 51 MXZ-3D/4D/5D Symptom Indication Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit • Refer to 11-6. "Check of LEV". Lighted Once LEV and drain pump The indoor unit detects an abnormality in the LEV and drain pump. does not •...
- Page 52 Indication Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit The primary current exceeds 15 A (MXZ-3D54/3D68/4D72VA, These symptoms do not mean any abnormality of the Primary current protection operates. MXZ-3D54VA2)/17 A (MXZ-4D83VA)/18 A (MXZ-5D102VA). product, but check the following points. Once Lighted •...
- Page 53 MXZ-6D Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) Outdoor The indoor unit detects an abnormality in the LEV • Refer to 11-6. "Check of LEV". Lighted Once LEV and drain pump unit does and drain pump. •...
- Page 54 Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) 21 'Outdoor unit A failure occurs 3 consecutive times within 30 13 times Not lighted Outdoor fan motor • Refer to 11-6. "Check of outdoor fan motor". stops and seconds after the fan gets started.
- Page 55 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2D33VA MXZ-2D40VA MXZ-2D42VA MXZ-2D53VA MXZ-2D53VAH MXZ-3D54VA MXZ-3D54VA2 MXZ-3D68VA MXZ-4D72VA MXZ-4D83VA MXZ-5D102VA MXZ-6D122VA Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature thermistor (RT64) Refer to 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2. "Outdoor control P.C.
- Page 56 11-6. TROUBLESHOOTING FLOW • When outdoor unit does not operate, LED on outdoor P.C. board is not lighting. Check of power supply MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 230 VAC in the Check the power supply and correct them.
- Page 57 MXZ-3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 230 VAC in the Check the power supply and correct them. power supply terminal block? Is the output voltage from the noise Replace the noise filter P.C.
- Page 58 • When the indoor unit does not operate, it cannot be operated either with the remote controller or with the EMERGENCY OPERATION switch. • When the outdoor unit does not operate, the OPERATION INDICATOR lamp on the indoor unit flashes ON and OFF every 0.5-second.
- Page 59 MXZ-6D122VA Turn OFF the power supply. LED indication for communication status Communication status is indicated Is there rated voltage in by the LED. Check the power the power supply? supply. Unit status Blinking: normal communication Lighting: abnormal communication or not connected Turn ON the power supply.
- Page 60 • In heating, the room does not get warm. • In cooling, the room does not get cool. How to check inverter/compressor Disconnect the connector (CNMC) between the inverter P.C. board/the outdoor control P.C. board and compressor, or disconnet the terminal of the compressor.
- Page 61 • The thermistor is abnormal. Check of outdoor thermistors Disconnect the connector in the following table. Replace the thermistor except RT64. In case that RT64 is abnormal, Is the resistance of the thermistor normal? (Refer to 11-5.) replace the inverter P.C. board or the outdoor power P.C.
- Page 62 • In cooling, the heat exchanger of non-operating indoor unit has frosted. • In heating, non-operating indoor unit gets warm. MXZ-2D MXZ-3D/4D/5D/6D Check of LEV CN724 Inverter P.C. board CN725 Turn ON the power supply to the outdoor unit after checking CN791 LEV coil is mounted to the LEV body securely.
- Page 63 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH MXZ-2D MXZ-4D83VA/5D102VA MXZ-4D83VA/5D102VA CN931 Inverter P.C. board Outdoor control P.C. board CN932 Disconnect CN932 and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to 11-5.) Turn ON the breaker.
- Page 64 MXZ-3D54VA/3D54VA2/3D68VA/4D72VA MXZ-3D54VA/3D54VA2/3D68VA/4D72VA Disconnect CN931 and measure the CN931 Outdoor control P.C. board resistance of the outdoor fan motor. Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor. normal? (Refer to right table) pin 1 - pin 4 pin 5 - pin 4 60 kΩ...
- Page 65 MXZ-6D122VA Disconnect CNF1 and measure the CNF1 Outdoor control resistance of the outdoor fan motor. P.C. board Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor. normal? (Refer to right table) pin 1 - pin 4 pin 5 - pin 4 Does the outdoor fan motor rotate smoothly? Replace the outdoor fan motor.
- Page 66 • The cooling operation or the heating operation does not operate. Check of R.V. coil MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH MXZ-2D CN721 Inverter P.C. board 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode.
- Page 67 MXZ-3D54VA/3D54VA2/3D68VA/4D72VA MXZ-3D54VA/3D54VA2/3D68VA/4D72VA CN711 Outdoor control P.C. board 1. Disconnect the lead wire leading to the compressor. CN712 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage 230 VAC Is there voltage of 230 VAC between pin 1 Replace the noise filter P.C.
- Page 68 MXZ-4D83VA/5D102VA MXZ-4D83VA/5D102VA CN921 Noise fi lter P.C. board 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode. 1. Turn OFF the power supply of the indoor and the outdoor unit, Is there voltage of 230 VAC between pin1 and and disconnect the connector CN781.
- Page 69 MXZ-6D122VA CNAC Outdoor control CN712 P.C. board 1. Disconnect the lead wire leading to the compressor. Outdoor power 2. 3 minutes after turning ON the power supply, start EMERGENCY CNAC2 P.C. board OPERATION in COOL mode. Is there voltage 230 VAC Replace the outdoor Is there voltage of 230 VAC between pin 1 between the pin 1 and pin 3 at...
- Page 70 • When the operation frequency does not go up from lowest frequency. Check of HPS MXZ-3D54VA2- MXZ-3D54VA2- MXZ-3D68VA/4D72VA/4D83VA/5D102VA/6D122VA CN681 MXZ-3D68VA/4D72VA/4D83VA/5D102VA Outdoor control P.C. board MXZ-6D122VA CN63H Outdoor control P.C. board 1. Disconnect the connector CN681/CN63H. 2. Check the resistance of HPS 1 minute after the outdoor unit breaker was turned OFF. Infinity Check the resistance between Replace HPS.
- Page 71 Check of bus-bar voltage MXZ-3D54VA/3D54VA2/3D68VA/4D72VA MXZ-4D83VA/5D102VA •Check the voltage of power supply. •Confi rm outdoor unit failure mode recall function. (Refer to 11-2.2.) Confi rm LED1 indication lamp on the outdoor control P.C. board. Blink 5 times Blink 6 times Lighting Replace the outdoor power Replace the outdoor control...
- Page 72 The other cases Indoor unit does not operate. (different operating models in multi system) • When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which transmits signal to the outdoor unit first decides the operation mode. •...
- Page 73 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr. 2015. No.OBH626 REVISED EDITION-H Distributed in Jan. 2015. No.OBH626 REVISED EDITION-G Distributed in Aug. 2014. No.OBH626 REVISED EDITION-F Distributed in Apr. 2014. No.OBH626 REVISED EDITION-E Distributed in Jan.