Mitsubishi Electric MUZ-LN25VGHZ User Manual

SERVICE MANUAL
Models
OUTDOOR UNIT
Indoor unit service manual
MSZ-LN•VGW/V/B/R Series (OBH766)
PARTS CATALOG (OBB768)
HFC
utilized
R32
MUZ-LN25VGHZ
-
E1
,
ER1
,
ET1
MUZ-LN35VGHZ
-
E1
,
ER1
,
ET1
MUZ-LN50VGHZ
-
E1
,
ER1
,
ET1
,
E2
MUZ-LN25VGHZ2
-
E1
,
ER1
,
E2
,
E3
,
SC1
,
ER2
MUZ-LN35VGHZ2
-
E1
,
ER1
,
E2
,
E3
,
SC1
,
ER2
MUZ-LN50VGHZ2
-
E1
,
SC1
,
ER1
CONTENTS
1. TECHNICAL CHANGES ······························3
2. SERVICING PRECAUTIONS FOR UNITS
USING REFRIGERANT R32 ·························4
3. PART NAMES AND FUNCTIONS ··················6
4. SPECIFICATION ········································7
5. NOISE CRITERIA CURVES ························10
6. OUTLINES AND DIMENSIONS ··················· 12
7. WIRING DIAGRAM ··································· 15
8. REFRIGERANT SYSTEM DIAGRAM ··········· 21
9. PERFORMANCE CURVES ························24
10. ACTUATOR CONTROL ····························· 43
11. SERVICE FUNCTIONS ······························ 44
12. TROUBLESHOOTING ······························· 45
13. DISASSEMBLY INSTRUCTIONS ·················69
MUZ-LN25VGHZ
MUZ-LN35VGHZ
No. OBH768
REVISED EDITION-G
OBH768 REVISED EDITION-F is void.
Revision G:
• MUZ-LN25/35VGHZ2-
E3
,
SC1
,
ER2
and
MUZ-LN50VGHZ2-
E1
,
SC1
,
ER1
have
been added.

Mitsubishi Electric MUZ-LN25VGHZ Specifications

General

Brand	Mitsubishi Electric
Model	MUZ-LN25VGHZ
Category	Air Conditioner
Language	English

Summary

SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32

SPECIFICATION

WIRING DIAGRAM

ACTUATOR CONTROL

SERVICE FUNCTIONS

TROUBLESHOOTING

CAUTIONS ON TROUBLESHOOTING

Safety precautions to be observed before performing troubleshooting.

FAILURE MODE RECALL FUNCTION

Table of outdoor unit failure mode recall function

Table listing outdoor unit failure modes, LED indications, and remedies.

TROUBLESHOOTING FLOW

Inverter and Compressor Checks

Procedure to check inverter, compressor, winding, and operation.

Component and System Checks

Checks for thermistors, R.V. coil, fan motor, power supply, LEV, P.C. board, miswiring, noise.

TEST POINT DIAGRAM AND VOLTAGE

Inverter P.C. board

DISASSEMBLY INSTRUCTIONS

Removing the inverter assembly and inverter P.C. board

Removing the compressor and 4-way valve