Mitsubishi Electric PUHZ-W85VHA User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES
..................................
3
2. SAFETY PRECAUTION
...................................
5
3. SPECIFICATIONS
............................................
8
4. DATA
.............................................................
31
5. OUTLINES AND DIMENSIONS
.....................
34
6. WIRING DIAGRAM
........................................
37
7. WIRING SPECIFICATIONS
...........................
49
8. REFRIGERANT SYSTEM DIAGRAM
...............
50
9. TROUBLESHOOTING
...................................
52
10. DISASSEMBLY PROCEDURE
....................
103
Notes:
• This manual describes service
data of outdoor unit only.
R410A
[Model Name]
PUHZ-W50VHA
PUHZ-W85VHA
PUHZ-HW112YHA
PUHZ-HW112YHA2
PUHZ-HW140VHA
PUHZ-HW140YHA
PUHZ-HW140VHA2
PUHZ-HW140YHA2
PUHZ-W85VHA(R1)
PUHZ-W85VHA(R1)-BS
PARTS CATALOG (OCB439)
• OCH439 REVISED EDITION-L
is void.
PUHZ-W50VHA-BS
PUHZ-W85VHA-BS
PUHZ-HW112YHA-BS
PUHZ-HW112YHA2-BS
PUHZ-HW140VHA-BS
PUHZ-HW140YHA-BS
PUHZ-HW140VHA2-BS
PUHZ-HW140YHA2-BS
[Service Ref.]
Refer to page 2.
SPLIT-TYPE, AIR TO WATER HEAT PUMP
No. OCH439
REVISED EDITION-M
April 2019
Revision:
• Added
PUHZ-HW112YHA2R7,
PUHZ-HW112YHA2R7-BS,
PUHZ-HW140VHA2R7,
PUHZ-HW140VHA2R7-BS,
PUHZ-HW140YHA2R7 and
PUHZ-HW140YHA2R7-BS in
REVISED EDITION-M.
• Some descriptions have been
modified.

Mitsubishi Electric PUHZ-W85VHA Specifications

General

Brand	Mitsubishi Electric
Model	PUHZ-W85VHA
Category	Heat Pump
Language	English

Summary

Technical Changes and Revisions

Key Model and Component Updates

Summarizes major changes to heat exchangers, controllers, and functions across models.

Safety Precautions

General Service and Refrigerant Safety

Essential safety rules to follow before, during, and after repair.

R410A Refrigerant Handling and Tool Safety

Precautions for using R410A refrigerant and specialized tools.

Piping Work and Salt Proof Model Precautions

Safety guidelines for refrigerant piping and installation of salt-proof units.

Product Specifications

Power Supply and Operating Conditions

Electrical specs and nominal operating parameters.

PUHZ-W Series Specifications

Technical data for PUHZ-W50VHA and PUHZ-W85VHA models.

PUHZ-HW112/140YHA Series Specifications

Technical data for PUHZ-HW112YHA and PUHZ-HW140YHA models.

PUHZ-HW112/140VHA2/YHA2 Series Specifications

Technical data for PUHZ-HW112YHA2 and PUHZ-HW140VHA2/YHA2 models.

Later HW Series (R-variants) Specifications

Technical data for later HW series models including R-variants.

Available Operating Ranges

Heating and Cooling Range Data

Water flow rate vs. return water temperature ranges for heating and cooling modes.

Technical Data

Noise Criterion Curves

Octave band sound pressure levels for noise evaluation.

Standard Operation Data Summary

Key operational parameters across various models and modes.

Unit Dimensions and Layout

Dimensions for PUHZ-W Series

External dimensions and installation space for PUHZ-W50/85VHA models.

Dimensions for PUHZ-HW Series

External dimensions and installation space for PUHZ-HW112/140YHA/VHA2 models.

Electrical Wiring Diagrams

PUHZ-W Series Wiring Diagrams

Electrical schematics for PUHZ-W50VHA and PUHZ-W85VHA models.

PUHZ-HW Series Wiring Diagrams

Electrical schematics for PUHZ-HW112/140YHA/VHA2/YHA2 and later models.

Wiring Specifications and Safety

Field Electrical Wiring Guidelines

Requirements for power wiring installation, cable types, and connections.

A-Control Wiring Safety Warning

Critical safety warning for A-control wiring and high voltage terminals.

Refrigerant System Diagrams

Refrigerant System Diagrams for W and HW Series

Schematic of the refrigerant circuit for W and HW series models.

Troubleshooting and Self-Diagnosis

Troubleshooting Overview and Test Run Checks

Summary of troubleshooting steps and pre-test run procedures.

Self-Diagnosis Action Table: Power On and Operation Errors

Actions for abnormalities detected during power-on and operation.

Self-Diagnosis Action Table: Communication, Protection, and U9 Errors

Troubleshooting for communication, protection, and U9 errors.

Component Diagnosis and Checks

Thermistor and Fan Motor Resistance Checks

Procedures and charts for diagnosing thermistors and DC fan motors.

Linear Expansion Valve Operation and Checks

Explanation of LEV operation, coil attachment/detachment, and pulse signals.

Test Point Diagrams

Outdoor Controller Circuit Board Test Points

Test points for PUHZ-W and PUHZ-HW series controller boards.

Component Board Layouts

Noise Filter, Power, and Converter Circuit Board Layouts

Diagrams for noise filter, power, and converter circuit boards.

Active Filter Module Layout

Diagram and checks for the active filter module.

Outdoor Unit Operation Monitor Function

SW2 Settings for Operation Data Display

Guide to using SW2 settings for monitoring various operational parameters.

SW2 Settings for Error History and U9 Codes

SW2 settings for accessing error history and U9 error details.

DIP Switch Functions

DIP Switch Settings for PUHZ-W Series

Configuration settings for DIP switches on PUHZ-W models.

DIP Switch Settings for PUHZ-HW Series

Configuration settings for DIP switches on PUHZ-HW models.

Request Code List for Service

Request Codes for Operation and Thermistors

Codes for operational status and thermistor readings.

Request Codes for Control States and Version Info

Codes for control states and software version information.

Request Code Details: Operation, Control, Error, and Settings

Detailed explanations for various request codes.

Disassembly Procedures

Removing Service Panel, Top Panel, and Fan Motor

Steps for removing external panels and the fan motor assembly.

Removing Electrical Components (Boards, Filters, Reactors)

Procedures for removing boards, filters, and reactors.

Removing Sensors and Heat Exchangers

Steps for removing thermistors, high pressure sensor, and plate heat exchanger.

Removing Fluid/Gas Control Components

Procedures for removing solenoid valves, LEV coils, 4-way valve, and switches.

Removing Major Mechanical Components (Compressor, Receiver)

Steps for removing the compressor and receiver.