Mitsubishi Electric PUY-A42NHA User Manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES·································2
2. REFERENCE MANUAL··································2
3. SAFETY PRECAUTION··································3
4. FEATURES ·····················································6
5. SPECIFICATIONS···········································7
6. DATA ·······························································9
7. OUTLINES AND DIMENSIONS····················13
8. WIRING DIAGRAM·······································16
9. WIRING SPECIFICATIONS ··························20
10. REFRIGERANT SYSTEM DIAGRAM ··············23
11. TROUBLESHOOTING···································26
12. EASY MAINTENANCE FUNCTION··············81
13. FUNCTION SETTING····································84
14. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ············92
15. DISASSEMBLY PROCEDURE ···················102
16. PARTS LIST ················································117
17. RoHS PARTS LIST ·····································126
No.OC367
REVISED EDITION-C
R410A
June 2007
[model names]
PUZ-A18NHA
PUZ-A24NHA
PUZ-A30NHA
PUZ-A36NHA
PUZ-A42NHA
PUZ-A18NHA-BS
PUZ-A24NHA-BS
PUZ-A30NHA-BS
PUZ-A36NHA-BS
PUZ-A42NHA-BS
PUY-A12NHA
PUY-A18NHA
PUY-A24NHA
PUY-A30NHA
PUY-A36NHA
PUY-A42NHA
PUY-A12NHA-BS
PUY-A18NHA-BS
PUY-A24NHA-BS
PUY-A30NHA-BS
PUY-A36NHA-BS
PUY-A42NHA-BS
[Service Ref.]
PUZ-A18NHA
PUZ-A24NHA
PUZ-A30NHA
PUZ-A36NHA
PUZ-A42NHA
PUZ-A18NHA-BS
PUZ-A24NHA-BS
PUZ-A30NHA-BS
PUZ-A36NHA-BS
PUZ-A42NHA-BS
PUY-A12NHA PUY-A12NHA
1
PUY-A18NHA PUY-A18NHA1
PUY-A24NHA PUY-A24NHA1
PUY-A30NHA PUY-A30NHA1
PUY-A36NHA PUY-A36NHA1
PUY-A42NHA
PUY-A12NHA
1-BS
PUY-A18NHA
1-BS
PUY-A24NHA
1-BS
PUY-A30NHA
1-BS
PUY-A36NHA
1-BS
PUY-A42NHA-BS
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing RoHS compliant
products, refer to the RoHS
PARTS LIST.
PUZ-A24/30/36NHA
PUY-A24/30/36NHA
Revision:
• “9-2. SEPARATE INDOOR
UNIT/OUTDOOR UNIT
POWER SUPPLIES” is
deleted in REVISED
EDITION-C.
• Some descriptions have
been modified.
• Please void OC367 REVISED
EDITION-B.
Outdoor unit
OC367C--1.qxp 07.6.20 0:56 PM Page 1

Mitsubishi Electric PUY-A42NHA Specifications

General

Brand	Mitsubishi Electric
Model	PUY-A42NHA
Category	Air Conditioner
Language	English

Summary

Technical Changes

Reference Manual

2-1. Indoor Unit

Details of indoor units and their service references.

2-2. Technical Data Book

Reference to the technical data book for system specifications.

Safety Precaution

3-1. Always Observe for Safety

General safety guidelines to follow before servicing.

3-2. Cautions Related to New Refrigerant

Specific safety measures for handling R410A refrigerant.

Features

Specifications

Data

6-1. Refilling Refrigerant Charge

Table detailing refrigerant charge amounts for various models.

6-2. Compressor Technical Data

Technical specifications for the compressor units.

6-3. Noise Criterion Curves

Sound pressure level data presented as noise criterion curves.

6-4. Standard Operation Data

Standard operational data for heat pump and cooling modes.

Outlines and Dimensions

Wiring Diagram

Wiring Specifications

9-1. Indoor Unit Power Supplied from Outdoor Unit

Wiring specifications for indoor units powered by outdoor units.

9-2. M-NET Wiring Method

Guidelines for connecting M-NET communication wiring.

9-3. Address Settings

Procedures for setting M-NET and refrigerant addresses.

Refrigerant System Diagram

Troubleshooting

11-1. Troubleshooting Overview

Summary of error codes and actions for troubleshooting.

11-2. Test Run Checkpoints

Pre-test run checks and procedures for ensuring proper operation.

11-3. Self-Diagnosis Procedures

Methods for performing unit self-diagnosis and interpreting results.

11-4. Self-Diagnosis Action Table

Table mapping error codes to specific actions and judgments.

11-5. Troubleshooting by Symptoms

Guide to diagnosing issues based on observed phenomena.

Customer Call Troubleshooting Guide

Common customer issues and their corresponding solutions.

Easy Maintenance Function

12-1. Maintenance Mode Operation Method

Steps to activate and use the maintenance mode for inspection.

Function Setting

13-1. Unit Function Setting by Remote Controller

Setting various unit functions using the wired remote controller.

13-2. Function Selection of Remote Controller

Overview of remote controller functions and their settings.

13-3. Function Selection of Wireless Remote Controller

Procedure for changing temperature display units on wireless remote.

Monitoring the Operation Data by the Remote Controller

14-1. How to Monitor Operation Data

Steps to access and view operational data via the remote controller.

14-2. Request Code List

List of request codes for monitoring specific operation data.

Disassembly Procedure

1. Panel and Cover Removal

Procedure for removing outer panels and covers.

2. Fan Motor Removal

Steps for safely removing the fan motor assembly.

3. Electrical Parts Box Removal

Procedure for accessing and removing the electrical parts box.

4. Thermistor Removal

Instructions for removing outdoor thermistor sensors.

7. Solenoid Valve and Expansion Valve Coil Removal

Steps to remove solenoid valve coils and expansion valve coils.

12. Compressor Removal

Procedure for removing the main compressor unit.

13. Accumulator Removal

Steps for safely removing the accumulator.

Parts List (non-RoHS compliant)

RoHS Parts List (RoHS compliant)