Mitsubishi Electric PUZ-WM112YAA User Manual

SERVICE MANUAL
No. OCH727
R32
March 2020
PARTS CATALOG (OCB727)
<Outdoor unit>
[Model Name]
PUZ-WM50VHA
PUZ-WM60VAA
PUZ-WM85VAA
PUZ-WM85YAA
PUZ-WM112VAA
PUZ-WM112YAA
Salt proof model
PUZ-WM50VHA-BS
PUZ-WM60VAA-BS
PUZ-WM85VAA-BS
PUZ-WM85YAA-BS
PUZ-WM112VAA-BS
PUZ-WM112YAA-BS
CONTENTS
1. REFERENCE MANUAL ································ 2
2. SAFETY PRECAUTION ······························· 3
3. SPECIFICATIONS ······································ 10
4. DATA ··························································· 12
5. OUTLINES AND DIMENSIONS·················· 13
6. WIRING DIAGRAM ····································· 15
7. WIRING SPECIFICATIONS ························ 18
8. REFRIGERANT SYSTEM DIAGRAM ········ 19
9. TROUBLESHOOTING ································ 22
10. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ···· 60
11. DISASSEMBLY PROCEDURE ··················· 66
Note:
• This manual describes
service data of the outdoor
units only.
AIR TO WATER HEAT PUMP UNITS
[Service Ref.]
PUZ-WM50VHA.UK
PUZ-WM60VAA.UK
PUZ-WM85VAA.UK
PUZ-WM85YAA.UK
PUZ-WM112VAA.UK
PUZ-WM112YAA.UK
PUZ-WM50VHA-BS.UK
PUZ-WM60VAA-BS.UK
PUZ-WM85VAA-BS.UK
PUZ-WM85YAA-BS.UK
PUZ-WM112VAA-BS.UK
PUZ-WM112YAA-BS.UK
PUZ-WM50VHA.UK

Mitsubishi Electric PUZ-WM112YAA Specifications

General

Cooling Capacity	11.2 kW
Heating Capacity	12.5 kW
Sound Pressure Level Heating	54 dB(A)
Refrigerant	R410A
Series	PUZ
Type	Inverter
Sound Pressure Level (Outdoor Unit)	52 dB(A)

Summary

1. REFERENCE MANUAL

2. SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

Essential safety rules to follow before maintenance.

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Precautions for using R32 refrigerant.

Warning for service

General warnings and precautions for service personnel.

Cautions for service

Specific cautions to be followed during service operations.

Refrigerant charge

Guidelines for charging refrigerant directly from a cylinder.

Cautions for unit using R32 refrigerant

Detailed safety precautions for units using R32 refrigerant.

Service tools

Choosing the outdoor unit installation location

Minimum installation area

Requirements for minimum installation space and ventilation.

3. SPECIFICATIONS

6. WIRING DIAGRAM

PUZ-WM85YAA.UK ... PUZ-WM112YAA-BS.UK

7. WIRING SPECIFICATIONS

FIELD ELECTRICAL WIRING (power wiring specifications)

8. REFRIGERANT SYSTEM DIAGRAM

PUZ-WM50VHA.UK PUZ-WM50VHA-BS.UK

Refrigerant system diagram for specific models.

PUZ-WM60VAA.UK ... PUZ-WM112VAA-BS.UK

Refrigerant system diagrams for other models.

PUZ-WM112VAA.UK ... PUZ-WM112YAA-BS.UK

9. TROUBLESHOOTING

9-1. TROUBLESHOOTING

General troubleshooting guide based on check codes.

9-2. SELF-DIAGNOSIS ACTION TABLE

Table of self-diagnosis codes and corresponding actions.

9-3. TROUBLESHOOTING OF PROBLEMS

Troubleshooting common operational problems and their causes.

9-4. HOW TO CHECK THE PARTS

Procedures for checking the resistance and function of parts.

9-5. HOW TO CHECK THE COMPONENTS

SW2 Setting for Diagnostic Display

11. DISASSEMBLY PROCEDURE

1. Removing the service, top and cover panels

2. Removing the fan motor (MF1)

3. Removing the electrical parts box

8. Removing the 4-way valve coil (21S4) linear expansion valve coil (LEV (A), LEV (B)) and lead wire for high pressure switch

9. Removing the 4-way valve

10. Removing linear expansion valve

11. Removing the high pressure switch (63H)

12. Removing the pressure sensor (63HS)

13. Removing the compressor (MC)