Mitsubishi Electric MUZ-AY50VG-E1 User Manual

No. OBH931
PARTS CATALOG (OBB931)
SERVICE MANUAL
OUTDOOR UNIT
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 ··························9
6. OUTLINES AND DIMENSIONS ··················· 10
7. WIRING DIAGRAM ··································· 12
8. REFRIGERANT SYSTEM DIAGRAM ··········· 18
9. PERFORMANCE CURVES ·························20
10. ACTUATOR CONTROL ····························· 36
11. SERVICE FUNCTIONS ······························37
12. TROUBLESHOOTING ······························· 38
13. DISASSEMBLY INSTRUCTIONS ·················58
Models
MUZ-AY25VG
-
E1
,
ET1
,
ER1
MUZ-AY35VG
-
E1
,
ET1
,
ER1
MUZ-AY42VG
-
E1
,
ET1
,
ER1
MUZ-AY50VG
-
E1
,
ET1
,
ER1
MUZ-AY25VGH
-
SC1
MUZ-AY35VGH
-
SC1
MUZ-AY42VGH
-
SC1
MUZ-AY50VGH
-
SC1
MUZ-AY25VG
MUZ-AY35VG
MUZ-AY42VG
MUZ-AY25VGH
MUZ-AY35VGH
MUZ-AY42VGH
Indoor unit service manual
MSZ-AY•VG, VGK, VGKP Series (OBH930, 932)
HFC
utilized
R32

Mitsubishi Electric MUZ-AY50VG-E1 Specifications

General

Brand	Mitsubishi Electric
Model	MUZ-AY50VG-E1
Category	Air Conditioner
Language	English

Summary

Technical Changes

Servicing Precautions for Units Using Refrigerant R32

Wiring Diagram

Refrigerant System Diagram

Actuator Control

Relation Between Main Sensor and Actuator

Service Functions

Change in Defrost Setting

Pre-Heat Control Setting

Troubleshooting

Cautions on Troubleshooting

Important safety precautions and checks before starting troubleshooting.

Failure Mode Recall Function

Procedures for recalling and interpreting error codes from the unit's memory.

Troubleshooting Check Table

A table listing symptoms, LED indications, conditions, and remedies.

Troubleshooting Criterion of Main Parts

Lists main parts and their resistance/voltage criteria for troubleshooting.

Troubleshooting Flow

Step-by-step diagnostic flowcharts for checking major components.

Test Point Diagram and Voltage

Diagrams showing test points and voltage measurements on the inverter P.C. board.

Disassembly Instructions

Removing the Cabinet

Removing the Inverter Assembly and Inverter P.C. Board

Removing R.V. Coil

Removing Thermistors

Removing Outdoor Fan Motor

Removing the Compressor and 4-way Valve

Removing the Expansion Valve Assembly