Mitsubishi Electric PUY-A12NHA 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-A12NHA Specifications

General

Brand	Mitsubishi Electric
Model	PUY-A12NHA
Category	Air Conditioner
Language	English

Summary

Technical Changes and Reference Manuals

Model Updates

Details technical changes and model updates for the air conditioning units.

Indoor Unit and Data Book References

Lists reference manuals for indoor units and the technical data book.

Safety Precautions

General Safety Observance

General guidelines and precautions to be observed for safe operation.

R410A Refrigerant Handling Cautions

Specific precautions for handling R410A refrigerant and related components.

Service Cautions, Refrigerant Charge & Tools

Cautions for servicing, refrigerant charging, and necessary tools for R410A.

Refrigerant Piping Work Cautions

Precautions and guidelines for performing refrigerant piping work.

Features

Chargeless System Feature

Description of the chargeless system for pre-charged refrigerant.

Specifications

Data

Refrigerant Charge and Compressor Data

Details refrigerant charge amounts and compressor technical data.

Noise Criterion Curves

Graphical representation of noise levels across different frequency bands.

Standard Operation Data

Provides standard operational data for various modes and conditions.

Outlines and Dimensions

Outdoor Unit Installation Space

Specifies required installation space dimensions for the outdoor unit.

Service Space Requirements

Details the necessary space for servicing the outdoor unit.

Foundation Bolts and Piping/Wiring Directions

Information on foundation bolts and piping/wiring connection directions.

Wiring Diagram

M-NET Adapter and Service Cautions

Diagram of M-NET adapter connections and servicing precautions.

Wiring Specifications

Indoor Unit Power Supply and M-NET Wiring

Wiring specs for indoor units powered by outdoor units and M-NET wiring.

M-NET and Refrigerant Address Settings

Configuration of M-NET addresses and refrigerant addresses for units.

Refrigerant System Diagram

Refrigerant Handling Procedures

Procedures for collecting refrigerant and handling test runs.

Test Run Procedures

Steps for starting and finishing a test run of the air conditioner.

Troubleshooting

Error Code Summary and Test Run Checks

Overview of error codes and essential checks before performing a test run.

Self-Diagnosis: Problem Diagnosis During Operation

Diagnosing problems that occur while the unit is operating.

Self-Diagnosis: Maintenance and Service

Performing self-diagnosis during maintenance or service procedures.

Remote Controller Diagnosis

Steps for diagnosing issues with the remote controller.

Wireless Remote Controller Malfunction Diagnosis

Diagnosing malfunctions using a wireless remote controller.

Self-Diagnosis Action Table (Power On)

Table detailing actions for abnormalities detected upon power-on.

Troubleshooting by Inferior Phenomena

Guidance for troubleshooting based on observed operational issues.

Component Checking Procedures

Methods for checking various components for proper function.

Thermistor Feature Chart

Resistance values for thermistors at different temperatures.

Linear Expansion Valve Operation

Explanation of linear expansion valve operation and pulse signals.

Attaching/Detaching Linear Expansion Valve Coil

Procedure for attaching and detaching the coil of the linear expansion valve.

Emergency Operation Procedures

Steps and conditions for activating emergency operation.

Test Point Diagram

Outdoor Controller Circuit Board Test Points

Diagrams indicating test points on the outdoor controller circuit board.

Function of Switches, Connectors and Jumpers

Switch and Connector Functions

Description of the functions of various switches and connectors.

Special Functions: Sound Priority and Demand Control

Details on low-level sound priority mode and demand control wiring.

Outdoor Unit Inspection Display Codes

Explanation of display codes for outdoor unit inspection.

Easy Maintenance Function

Maintenance Mode Operation Method

Guide on how to operate the maintenance mode for checking unit data.

Refrigerant Address Settings

Procedure for setting refrigerant addresses for single and multi-system units.

Operation Condition Guide

Guide to determine operation state based on temperature differences.

Function Setting

Unit Function Setting by Remote Controller

Setting various unit functions using the remote controller interface.

Wired Remote Controller Function Selection

Procedure for selecting functions using a wired remote controller.

Wireless Remote Controller Function Selection

Procedure for selecting functions using a wireless remote controller.

Monitoring the Operation Data by the Remote Controller

How to Monitor Operation Data

Steps to monitor operation data using the remote controller's maintenance mode.

Request Code List

List of request codes for monitoring specific operation data.

Disassembly Procedure

Removing Outer Panels and Fan Motor

Procedure for removing the unit's outer panels and fan motor.

Removing Electrical Parts Box and Thermistors

Steps to remove the electrical parts box and various thermistors.

Removing Solenoid Valves and Expansion Valve

Procedure for removing solenoid valves and the linear expansion valve.

Removing Switches, Four-way Valve, and Linear Expansion Valve

Steps to remove switches, four-way valve, and linear expansion valve.

Removing Compressor and Accumulator

Procedure for removing the compressor and accumulator.

Removing Panels, Fan Motor, and Electrical Parts Box

Steps to remove unit panels, fan motor, and electrical parts box.

Removing Thermistors

Procedure for removing various thermistors from the unit.

Removing Solenoid Valves and Expansion Valve

Steps to remove solenoid valves and the linear expansion valve.

Removing Switches, Reactor, and Capacitor

Procedure for removing switches, reactor, and capacitor.

Removing Compressor and Accumulator

Steps to remove the compressor and accumulator from the unit.

Removing Panels, Fan Motor, and Electrical Parts Box

Procedure for removing unit panels, fan motor, and electrical parts box.

Removing Thermistors

Steps to remove various thermistors from the unit.

Removing Solenoid Valves and Expansion Valve

Procedure for removing solenoid valves and the linear expansion valve.

Removing Switches, Reactor, and Capacitor

Steps to remove switches, reactor, and capacitor.

Removing Compressor and Accumulator

Procedure for removing the compressor and accumulator.

Parts List (non-RoHS compliant)

Structural Parts List

List of structural parts for the air conditioning units.

Functional Parts

Model-Specific Functional Parts

List of functional parts categorized by specific model numbers.

RoHS Parts List (RoHS compliant)

RoHS Compliant Functional Parts List

List of functional parts that comply with RoHS standards.