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SPLIT-TYPE, AIR TO WATER HEAT PUMP
SERVICE MANUAL
R410A
Outdoor unit
[Model Name]
PUHZ-SW40VHA
PUHZ-SW50VHA
PUHZ-SW50VKA
Salt proof model
PUHZ-SW40VHA-BS
PUHZ-SW50VHA-BS
PUHZ-SW50VKA-BS
[Service Ref.]
PUHZ-SW40VHA
PUHZ-SW40VHAR1
PUHZ-SW50VHA
PUHZ-SW50VHAR1
PUHZ-SW50VKA
PUHZ-SW40VHA-BS
PUHZ-SW40VHAR1-BS
PUHZ-SW50VHA-BS
PUHZ-SW50VHAR1-BS
PUHZ-SW50VKA-BS
REVISED EDITION-C
Revision:
• Added
PUHZ-SW50VKA and
PUHZ-SW50VKA-BS in
REVISED EDITION-C.
• Some descriptions have
been modified.
• Please void OCH525
Note:
• This manual describes
service data of the outdoor
units only.
CONTENTS
TECHNICAL CHANGES ···································· 2
1. REFERENCE MANUAL ································· 3
2. SAFETY PRECAUTION ································· 4
3. FEATURES ····················································· 8
4. SPECIFICATIONS ·········································· 8
5. DATA ····························································· 10
6. OUTLINES AND DIMENSIONS ··················· 12
7. WIRING DIAGRAM ······································ 14
8. WIRING SPECIFICATIONS ·························· 16
9. REFRIGERANT SYSTEM DIAGRAM ············· 17
10. TROUBLESHOOTING ································· 19
11. DISASSEMBLY PROCEDURE ···················· 65
PARTS CATALOG (OCB525)
July 2015
No. OCH525
REVISED EDITION-B.
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Table of Contents
Related Manuals for Mitsubishi Electric EHST20C-VM2
Summarization of Contents
REFERENCE MANUAL
INDOOR UNIT SERVICE MANUAL
Lists model names and corresponding service manual numbers for indoor units.
SAFETY PRECAUTIONS
CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for R410A refrigerant, covering preparation and handling.
REFRIGERANT PIPING AND HANDLING
Service Tools
Lists exclusive service tools required for R410A refrigerant.
Precautions for Reusing R22 Pipes
Flowchart for determining pipe reusability and filter dryer necessity.
Precautions for Salt Proof Model Piping
Guidelines for refrigerant piping using R410A, emphasizing thickness.
UNIT SPECIFICATIONS AND FEATURES
FEATURES
Lists key features, including the chargeless system.
SPECIFICATIONS
Detailed specifications for outdoor units, including operating conditions.
NOISE CRITERION CURVES
Graphs showing noise levels across frequency bands for various models.
OUTLINES AND DIMENSIONS
Diagrams and measurements for unit installation and clearances.
DATA AND TECHNICAL DETAILS
REFILLING REFRIGERANT CHARGE
Table showing refrigerant charge amounts based on piping length.
COMPRESSOR TECHNICAL DATA
Technical data for compressors, including winding resistance.
Request Code List
List of request codes and their corresponding display ranges and units.
WIRING AND DIAGRAMS
WIRING DIAGRAM
Wiring diagram for outdoor units, showing component connections.
WIRING SPECIFICATIONS
Details on power supply, wire size, and circuit rating for electrical wiring.
REFRIGERANT SYSTEM DIAGRAM
Diagram of the refrigerant system, showing components and flow.
CIRCUIT BOARD DIAGRAMS
Diagrams of various circuit boards, including test points.
TROUBLESHOOTING
REFRIGERANT COLLECTING (PUMP DOWN)
Procedure for collecting refrigerant before unit movement.
General Troubleshooting Symptoms
Addresses common issues like water sounds, poor heating/cooling, and display problems.
SELF-DIAGNOSIS ACTION TABLE
Details abnormalities detected and their corresponding actions.
Remote Controller Issues
Troubleshooting for remote controller display, operation, and capacity issues.
"PLEASE WAIT" Display Troubleshooting
Troubleshooting flow for persistent "PLEASE WAIT" display on the remote.
No Display on Remote Controller Troubleshooting
Troubleshooting flow for no display on the remote controller.
COMPONENT CHECK AND FUNCTIONALITY
HOW TO CHECK THE PARTS
Procedures for checking thermistors, motors, and valves.
Linear Expansion Valve Operation
Explanation of the LEV's operation, control, and physical checks.
Function of Switches, Connectors, and Jumpers
Detailed functions and settings of DIP switches and push switches.
Special Function: Low-Noise Mode
Instructions for modifying the unit for low-noise operation.
Operation Monitoring and Error Display
Explains LED indicators, operation monitor, and error codes.
SW2 Setting for Data Display
Explanation of SW2 settings for displaying various operational data.
DISASSEMBLY PROCEDURE
OPERATING PROCEDURE
Steps for disassembling the top, service, front, and back panels.
Removing the Fan Motor
Procedure for removing the fan motor and related components.
Removing Electrical Parts Box
Procedure for removing the electrical parts box.
Removing Thermistors
Procedure for removing specific thermistors (2-phase, liquid).
Removing Compressor and Related Components
Procedure for removing the compressor, receiver, and sensors.
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