Mitsubishi Electric PUZ-WM85VAA-BS.UK 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-WM85VAA-BS.UK Specifications

General

Model	PUZ-WM85VAA-BS.UK
Category	Heat Pump
Heating Capacity	8.5 kW
Cooling Capacity	8.0 kW
Energy Efficiency Rating	A++
Refrigerant	R32
Power Supply	230V, 50Hz
Operating Temperature Range (Cooling)	-5°C to 46°C
Type	Air Source Heat Pump
Operating Temperature Range (Heating)	-20°C to 24°C

Summary

Safety Precaution

2-2. Cautions Related to New Refrigerant

Specific precautions for using R32 refrigerant.

1. Warning for Service

Detailed warnings and precautions for service personnel.

3. Refrigerant Charge

4. Cautions for Unit Using R32 Refrigerant

Detailed safety guidelines for units using R32 refrigerant.

Specifications

Wiring Diagram

Wiring Specifications

Field Electrical Wiring (Power Wiring Specifications)

Refrigerant System Diagram

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

Troubleshooting

9-1. Troubleshooting

Overview of self-diagnosis and troubleshooting actions.

9-2. Self-Diagnosis Action Table

Table correlating check codes with causes and actions.

9-3. Troubleshooting of Problems

Guide to resolving common operational problems and phenomena.

9-4. How to Check the Parts

Procedures for testing and checking various unit components.

9-5. How to Check the Components

Detailed methods for checking specific components like sensors and valves.

9-6. Test Point Diagram

Diagrams showing test points on circuit boards for diagnosis.

9-7. Function of Switches, Connectors and Jumpers

Explanation of DIP switch functions and connector pinouts.

Disassembly Procedure

1. Removing the Service, Top and Cover Panels

2. Removing the Fan Motor (MF1)

3. Removing the Electrical Parts Box

4. Disassembling the Electrical Parts Box (V Model Only)

5. Disassembling the Electrical Parts Box (Y Model Only)

11. Removing the 4-Way Valve Coil (21S4), LEV Coil (LEV-A, LEV-B), Lead Wires for High Pressure Switch

12. Removing the 4-Way Valve, LEV (LEV-A, LEV-B), High Pressure Switch and Pressure Sensor