Mitsubishi Electric PUZ-M250YKA User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
R32
Outdoor unit
[Model Name]
PUZ-M200YKA
PUZ-M250YKA
[Service Ref.]
PUZ-M200YKA.UK
PUZ-M250YKA.UK
PARTS CATALOG (OCB737)
CONTENTS
1. REFERENCE MANUAL ···························· 2
2. SAFETY PRECAUTION ···························· 2
3. FEATURES ·········································· 12
4. SPECIFICATIONS ································· 13
5. DATA ·················································· 14
6. OUTLINES AND DIMENSIONS ················ 17
7. WIRING DIAGRAM ································ 18
8. WIRING SPECIFICATIONS ····················· 19
9. REFRIGERANT SYSTEM DIAGRAM ··········· 24
10. TROUBLESHOOTING ···························· 26
11. FUNCTION SETTING ····························· 80
12. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ···91
13. EASY MAINTENANCE FUNCTION ··········100
14. DISASSEMBLY PROCEDURE ················103
Note:
• This manual describes service
data of the outdoor units only.
No. OCH737
March 2020

Mitsubishi Electric PUZ-M250YKA Specifications

General

Cooling Capacity (kW)	25.0
Heating Capacity (kW)	28.0
Refrigerant	R410A
Type	Outdoor Unit
Operating Temperature Range (Heating)	-20 ~ +21 °C

Summary

SAFETY PRECAUTIONS

General Safety Observance

Always observe safety rules and disconnect power before accessing terminals.

R32 Refrigerant Piping and Tool Requirements

Guidelines for refrigerant piping work and necessary tools for R32.

R32 Refrigerant Handling Cautions

Specific safety precautions for units using R32 refrigerant.

Refrigerant Handling and Usage Guidelines

Rules for handling refrigerant, including charging and cylinder usage.

Warnings and Cautions for Service

Service Personnel Qualifications

Requirement for authorized and qualified technicians for maintenance and repair.

Refrigerant Leak and Fire Safety

Precautions regarding refrigerant leaks, ignition sources, and poisonous gases.

Refrigerant Recovery and Charging Procedures

Procedures for recovering refrigerant and charging the system.

Cautions for unit using R32 refrigerant

Servicing Information and Area Checks

Safety checks for the work area, including fire extinguishers and ventilation.

Flammable Refrigerant Detection and Leak Methods

Procedures for detecting flammable refrigerants and methods for leak detection.

Decommissioning and Labelling Requirements

Procedures for decommissioning and labelling equipment after refrigerant removal.

Refrigeration Equipment and Electrical Device Checks

Checks on refrigeration equipment and electrical components for safety.

Refrigerant Removal and Evacuation Procedures

Steps for safely removing and evacuating refrigerant from the system.

Refrigerant Recovery Process

Guidelines for safely recovering and transferring refrigerants.

Sealed Component Repair Precautions

Precautions when repairing sealed components, especially electrical ones.

Refrigerant Charging Procedures

Specific requirements for charging refrigerant into the system.

Service Tools

Precautions for Reusing Existing Refrigerant Pipes

Guidelines and flowchart for reusing existing R22/R410a refrigerant pipes.

Cautions for refrigerant piping work

R32 Tool Compatibility

Table indicating compatibility of R32 tools with other refrigerants.

Outdoor Unit Installation Location

Minimum Installation Area Requirements

Guidelines for minimum installation space and ventilation.

Minimum installation area

FEATURES

Chargeless System with Pre-charged Refrigerant

Description of the chargeless system and its benefits for installation.

SPECIFICATIONS

WIRING DIAGRAM

WIRING SPECIFICATIONS

Field Electrical Wiring Specifications

Details on power wiring specifications, including wire size and cable length.

REFRIGERANT SYSTEM DIAGRAM

REFRIGERANT COLLECTING (PUMP DOWN)

TEST RUN PROCEDURES

TROUBLESHOOTING

Pre-Test Run Inspection Checklist

Essential checks to perform before initiating a test run.

Test Run Procedures

Wired Remote Controller Test Run

Steps for performing a test run using a wired remote controller.

Remote Controller Test Run Procedures

Test Run for Wired Remote Controller (Type C)

Procedure for test run using Type C wired remote controller.

Test Run for Wireless Remote Controller (PAR-SL100A-E)

Procedure for test run using PAR-SL100A-E wireless remote controller.

Self-Diagnosis Procedures

Self-Diagnosis Steps for PAR-4xMAA

Guide to performing self-diagnosis using PAR-4xMAA remote controller.

Remote Controller Check Procedure

Wireless Remote Controller Self-Diagnosis

Self-Diagnosis for Type C Wireless Controller

Steps for self-diagnosis using Type C wireless remote controller.

Self-Diagnosis for PAR-SL100A-E Wireless Controller

Steps for self-diagnosis using PAR-SL100A-E wireless remote controller.

Error Code Indicators and Symptoms

Indoor Unit Error Patterns and Meanings

Describes error codes and symptoms related to indoor units.

Outdoor Unit Error Patterns and Meanings

Describes error codes and symptoms related to outdoor units.

SELF-DIAGNOSIS ACTION TABLE

Communication Error Codes (E0-E5)

Remote Controller Communication Errors (E0-E4)

Troubleshooting remote controller transmission and signal reception errors.

Remote Controller Board Errors (E1, E2)

Diagnosing faults within the remote controller's control board.

Remote Controller Transmission Errors (E3, E5)

Troubleshooting errors related to remote controller transmission.

Communication Error Codes (E6-EF, PL)

Indoor/Outdoor Unit Communication Errors (E6-E9)

Troubleshooting communication errors between indoor and outdoor units.

Refrigerant Mismatch Error (EE)

Diagnosing errors from incompatible refrigerant unit combinations.

Undefined and Refrigerant Errors (EF, PL)

Troubleshooting undefined error codes and refrigerant circuit issues.

Communication Error Codes (Ed, P8, PL)

Serial Communication Error (Ed)

Troubleshooting errors in serial communication between controller boards.

Pipe Temperature Errors (P8)

Diagnosing errors related to pipe temperature readings.

Refrigerant Circuit Errors (PL)

Troubleshooting issues within the refrigerant circuit.

Troubleshooting Common Phenomena

Remote Controller Display Issues

Troubleshooting problems with the remote controller display.

Delayed Unit Startup and Operation Anomalies

Addressing issues with unit startup delays and unintended operation.

Operation Switch and Error Code Issues

Troubleshooting when operation switches have no effect or error codes appear.

Observation During Operation

Indoor Unit White Mist and Outdoor Unit Water Expulsion

Understanding normal operational observations like mist and water expulsion.

Remote Controller Display and Signal Issues

Troubleshooting dim displays or signal reception problems with the remote controller.

HOW TO CHECK THE PARTS

DC Fan Motor and Controller Board Checks

COMPONENT CHARACTERISTIC DATA

Linear Expansion Valve Operation

EMERGENCY OPERATION PROCEDURES

TEST POINT DIAGRAM

Outdoor Noise Filter Circuit Board Diagram

Outdoor Power Circuit Board Diagram

SWITCHES, CONNECTORS, AND JUMPERS

UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER

Selecting Functions Using Wired Remote Controller

Selecting Functions Using Wireless Remote Controller (Type C)

Selecting Functions Using Wireless Remote Controller (PAR-SL100A-E)

FUNCTION SELECTION OF REMOTE CONTROLLER

PAR-4xMAA Remote Controller Functions

Guide to functions available on the PAR-4xMAA remote controller.

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

Monitoring Operation Data Procedure

Steps to monitor operation data and error history via remote controller.

Request Code List for Operation Data

Detail Contents in Request Code

EASY MAINTENANCE FUNCTION

SMOOTH MAINTENANCE Overview

Explanation of the smooth maintenance feature for data display.

SMOOTH MAINTENANCE

DISASSEMBLY PROCEDURE

Disassembly Procedure