Mitsubishi Electric MXZ-2C20NAHZ4 User Manual

PARTS CATALOG (OBB702)
SERVICE MANUAL
OUTDOOR UNIT
Models
MXZ-2C20NA2 -
U1
,
U4
MXZ-2C20NAHZ
MXZ-2C20NA3
-
U1
MXZ-2C20NAHZ2 -
U1
MXZ-2C20NA4 -
U1
MXZ-2C20NAHZ3 -
U1
MXZ-3C24NA MXZ-2C20NAHZ4 -
U1
MXZ-3C24NA2 -
U1
MXZ-3C24NAHZ
MXZ-3C24NA3
-
U1
MXZ-3C24NAHZ2 -
U1
MXZ-3C24NA4 -
U1
MXZ-3C24NAHZ3 -
U1
MXZ-3C30NA MXZ-3C24NAHZ4 -
U1
MXZ-3C30NA2 -
U1
MXZ-3C30NAHZ
MXZ-3C30NA3
-
U1
MXZ-3C30NAHZ2 -
U1
MXZ-3C30NA4 -
U1
MXZ-3C30NAHZ3 -
U1
MXZ-4C36NA MXZ-3C30NAHZ4 -
U1
MXZ-4C36NA2 -
U1
MXZ-4C36NA3 -
U1
MXZ-4C36NA4 -
U1
MXZ-5C42NA
MXZ-5C42NA2
-
U1
MXZ-5C42NA3 -
U1
MXZ-5C42NA4 -
U1
No. OBH702
REVISED EDITION-N
Indoor unit service manual
MSZ-FE·NA Series (OBH542)
MSZ-FH·NA Series (OBH683)
MSZ-GE·NA Series (OBH548)
MSZ-GL·NA Series (OBH732)
MSZ-EF·NA Series (OBH736)
MSZ-FS·NA Series (OBH872)
MFZ-KA·NA Series (OBH568)
MFZ-KJ·NA Series (OBH752)
SLZ-KA·NA Series (OCH487)
SLZ-KF·NA.TH Series (OCH669)
PLA-A·BA Series (OCH420)
PLA-A·EA Series (OCH640)
SEZ-KD·NA Series
PEAD-A·AA Series
PCA-A·KA Series (OCH455)
MVZ-A·AA Series
SVZ-KP·NA Series (MD-1404-K019)
CONTENTS
• INDOOR / OUTDOOR UNIT
COMPATIBILITY TABLE ······················4
1. TECHNICAL CHANGES ······························8
2. SAFETY PRECAUTION ·······························9
3. PART NAMES AND FUNCTIONS ················13
4. SPECIFICATION ······································ 14
5. NOISE CRITERIA CURVES ························30
6. OUTLINES AND DIMENSIONS ··················· 33
7. WIRING DIAGRAM ··································· 39
8. REFRIGERANT SYSTEM DIAGRAM ··········· 62
9. DATA ······················································ 75
10. ACTUATOR CONTROL ··························· 106
11. SERVICE FUNCTIONS ···························· 107
12. TROUBLESHOOTING ······························110
13. DISASSEMBLY INSTRUCTIONS ··············· 141
HFC
utilized
R410A
Revision N:
• 4. SPECIFICATION and 8. REFRIGERANT
SYSTEM DIAGRAM have been corrected.
OBH702 REVISED EDITION-M is void.
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2
MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3
MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4

Mitsubishi Electric MXZ-2C20NAHZ4 Specifications

General

Type	Heat Pump
Energy Efficiency Ratio (EER)	12.5
Refrigerant	R410A
Voltage	208/230 V
Maximum Number of Connectable Indoor Units	2
Cooling Capacity	20, 000 BTU/hr
Compressor Type	Inverter
Indoor Unit Dimensions (HxWxD)	Varies by indoor unit model
Indoor Unit Weight	Varies by indoor unit model

Summary

INDOOR / OUTDOOR UNIT COMPATIBILITY TABLE

Compatibility Tables by Model Series

Tables showing indoor/outdoor unit compatibility for various model series.

2 SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

General safety precautions for working on the unit, including preparation and during service.

2-2. CAUTIONS RELATED TO R410A REFRIGERANT

Specific safety precautions and recommendations for handling R410A refrigerant.

4 SPECIFICATION

7 WIRING DIAGRAM

8 REFRIGERANT SYSTEM DIAGRAM

Refrigerant Piping Information

Operating Range

Maximum Refrigerant Piping Length & Pipe Size Selection

Details maximum piping lengths and required pipe sizes for multi-system configurations.

9 DATA

12 TROUBLESHOOTING

12-1. CAUTIONS ON TROUBLESHOOTING

12-2. FAILURE MODE RECALL FUNCTION

12-3. INSTRUCTION OF TROUBLESHOOTING

Flowchart and guidance for diagnosing outdoor unit issues based on LED indicators.

12-4. TROUBLESHOOTING CHECK TABLE

Table detailing symptoms, LED indications, conditions, and remedies for troubleshooting.

12-5. TROUBLESHOOTING CRITERION OF MAIN PARTS

Criteria for checking key components like thermistors, compressor, fan motor, and coils.

12-6. TROUBLESHOOTING FLOW

Flowcharts for diagnosing specific issues like outdoor unit not operating or R.V. coil problems.

13 DISASSEMBLY INSTRUCTIONS

1. Removing the cabinet and the panels

2. Removing the outdoor control P.C. board, the reactor, the outdoor power P.C. board, and the heatsink

Procedure for removing internal electronic boards, reactor, and heatsink.

3. Removing the fan motor

4. Removing the compressor and the 4-way valve

Steps for removing the main compressor and the 4-way refrigerant valve.

5. Removing the expansion valve