Mitsubishi Electric MXZ-2C20NA2-U1 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-2C20NA2-U1 Specifications

General

Series	MXZ
Outdoor Unit Model	MXZ-2C20NA2-U1
Cooling Capacity	20, 000 BTU/h
Refrigerant	R410A
Voltage	208/230V
Maximum Number of Connectable Indoor Units	2
Indoor Unit Dimensions (HxWxD)	Varies by model
Indoor Unit Weight	Varies by model
Type	Multi-Zone
Power Supply	208/230V
Phase	1-Phase
Operating Temperature (Cooling)	14°F to 115°F

Summary

2 SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

General safety precautions before and during repair services, including tool preparation and electrical safety.

2-2. CAUTIONS RELATED TO R410A REFRIGERANT

Specific safety guidelines for handling R410A refrigerant, piping, and tools.

2-3. Cautions for refrigerant piping work

7 WIRING DIAGRAM

8 REFRIGERANT SYSTEM DIAGRAM

9-2. CAPACITY AND THE INPUT CURVES

9-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY

9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

(1) COOL operation

(2) HEAT operation

11 SERVICE FUNCTIONS

11-1. PRE-HEAT CONTROL

11-2. AUTO LINE CORRECTING

Describes the auto line correcting function for wiring/piping detection and correction, including LED indications.

11-3. CHANGING THE SET REFRIGERANT EVAPORATING TEMPERATURE

12 TROUBLESHOOTING

12-1. CAUTIONS ON TROUBLESHOOTING

Safety precautions and initial checks to perform before troubleshooting the outdoor unit.

12-2. FAILURE MODE RECALL FUNCTION

3. Troubleshooting procedure

A step-by-step guide to diagnosing outdoor unit abnormalities using LED indicators and checking specific components.

12-4. TROUBLESHOOTING CHECK TABLE

A detailed table listing symptoms, abnormal points, LED indications, conditions, and remedies for troubleshooting.

12-3. INSTRUCTION OF TROUBLESHOOTING

12-5. TROUBLESHOOTING CRITERION OF MAIN PARTS

12-6. TROUBLESHOOTING FLOW

12-7. TEST POINT DIAGRAM AND VOLTAGE

1. Outdoor control P.C. board

2. Outdoor power P.C. board

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

4. Removing the compressor and 4-way valve

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