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Mitsubishi Electric PUY-A12NHA4 User Manual

Mitsubishi Electric PUY-A12NHA4
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SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL ································· 2
2. SAFETY PRECAUTION ································· 3
3. FEATURES ····················································· 6
4. SPECIFICATIONS ·········································· 7
5. DATA ······························································· 9
6. OUTLINES AND DIMENSIONS ··················· 13
7. WIRING DIAGRAM ······································ 16
8. WIRING SPECIFICATIONS ·························· 20
9.
REFRIGERANT SYSTEM DIAGRAM
············· 25
10. TROUBLESHOOTING ·································· 28
11. EASY MAINTENANCE FUNCTION·············· 85
12. FUNCTION SETTING ··································· 88
13.
MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
·····96
14. DISASSEMBLY PROCEDURE ··················· 106
No.OCH481
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
R410A
November 2010
[Model names]
PUZ-A18NHA4
PUZ-A24NHA4
PUZ-A30NHA4
PUZ-A36NHA4
PUZ-A42NHA4
PUZ-A18NHA4-BS
PUZ-A24NHA4-BS
PUZ-A30NHA4-BS
PUZ-A36NHA4-BS
PUZ-A42NHA4-BS
PUY-A12NHA4
PUY-A18NHA4
PUY-A24NHA4
PUY-A30NHA4
PUY-A36NHA4
PUY-A42NHA4
PUY-A12NHA4-BS
PUY-A18NHA4-BS
PUY-A24NHA4-BS
PUY-A30NHA4-BS
PUY-A36NHA4-BS
PUY-A42NHA4-BS
[Service Ref.]
PUZ-A18NHA4
PUZ-A24NHA4
PUZ-A30NHA4
PUZ-A36NHA4
PUZ-A42NHA4
PUZ-A18NHA4-BS
PUZ-A24NHA4-BS
PUZ-A30NHA4-BS
PUZ-A36NHA4-BS
PUZ-A42NHA4-BS
PUY-A12NHA4
PUY-A18NHA4
PUY-A24NHA4
PUY-A30NHA4
PUY-A36NHA4
PUY-A42NHA4
PUY-A12NHA4-BS
PUY-A18NHA4-BS
PUY-A24NHA4-BS
PUY-A30NHA4-BS
PUY-A36NHA4-BS
PUY-A42NHA4-BS
NOTE:
This manual describes only
service data of the outdoor
units.
RoHS compliant products
have <G> mark on the spec
name plate.
PUZ-A24/30/36NHA4
PUY-A24/30/36NHA4
Outdoor unit
PARTS CATALOG (OCB481)

Table of Contents

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Mitsubishi Electric PUY-A12NHA4 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelPUY-A12NHA4
CategoryAir Conditioner
LanguageEnglish

Summary

1 REFERENCE MANUAL

1-1. Indoor Unit Models

Lists indoor unit models and their corresponding service references.

2 SAFETY PRECAUTIONS

General Safety Guidelines

Essential safety rules before accessing terminals and general precautions.

R410A Refrigerant Handling

Specific precautions for R410A refrigerant, including pipe preparation and tools.

Service Tools for R410A

Lists essential tools required for servicing R410A refrigerant systems.

2-3. REFRIGERANT PIPING WORK CAUTIONS

Pipe Thickness and Flare Nut Specifications

Specifies pipe thickness and flare nut dimensions for R410A compatibility.

R410A Tools and Materials Guide

Details tools for R410A and compatibility with R22 tools.

3 FEATURES

Chargeless System Description

Explains the pre-charged refrigerant system for installation convenience and reliability.

5 DATA

Refrigerant Charge Specifications

Provides refrigerant charge amounts (oz, kg) based on piping length for various models.

Compressor Technical Specifications

Lists technical data for compressors, including winding resistance.

Noise Criterion Curves

Graphs showing noise levels (dB) across different band frequencies for various models.

Standard Operation Data Tables

Provides detailed operational data (capacity, input, electrical, refrigerant, temperatures) for different models.

6 OUTLINES AND DIMENSIONS

Outdoor Unit Dimensions and Installation Clearances

Illustrates dimensions, required clearances, foundation requirements, and piping/wiring directions for outdoor units.

Piping Knockout Hole Details

Details the specifications and locations of knockout holes for piping connections.

7 WIRING DIAGRAMS

Outdoor Unit Wiring Configurations

Illustrates electrical connections and component layouts for various outdoor unit models and M-NET integration.

8 WIRING SPECIFICATIONS

Power Supply from Outdoor Unit

Details wiring specifications for 1:1 and simultaneous twin systems when power is supplied from the outdoor unit.

Separate Indoor/Outdoor Unit Power Supplies

Explains wiring configurations for separate power supplies between indoor and outdoor units.

Indoor-Outdoor Connecting Cable Specifications

Specifies cable types, sizes, and maximum lengths for indoor-outdoor unit connections.

M-NET Communication Wiring Guidelines

Provides guidelines for M-NET wiring, including grounding and transmission wire specifications.

9 REFRIGERANT SYSTEM DIAGRAMS

PUZ Series Refrigerant Circuit Diagrams

Illustrates the refrigerant circuit for PUZ series outdoor units.

PUY Series Refrigerant Circuit Diagrams

Illustrates the refrigerant circuit for PUY series outdoor units.

10 TROUBLESHOOTING

Refrigerant Recovery and Test Run Procedures

Procedures for recovering refrigerant and performing unit test runs.

Checking Points Under Test Run

Key checks to perform before initiating a test run on the unit.

Test Run Operation Guide

Step-by-step guide for conducting a test run using the wireless remote controller.

Self-Diagnosis Procedures

Explains how to perform self-diagnosis for various scenarios, including during operation and maintenance.

Self-Diagnosis Action Table

A table detailing abnormalities detected on power-on and their corresponding actions.

Troubleshooting Operational Phenomena

Guides users on diagnosing and resolving operational issues based on observed phenomena.

Customer Service Call Guidance

Addresses common customer issues and provides response guidance.

Part Checking Procedures

Details methods for checking the resistance and continuity of various electrical components.

Emergency Operation Procedures

Instructions for operating the unit in emergency mode and releasing it, including data parameters.

Test Point Diagrams

Illustrates test points and connection layouts for key circuit boards and modules.

Switches, Connectors, and Jumpers Functions

Explains the function and settings of various DIP and push switches on the control board.

Special Functions

Low-Level Sound Priority Mode

Describes how to activate a mode that reduces outdoor unit sound by adjusting compressor frequency.

Demand Control Configuration

Explains demand control via external input to reduce power consumption.

Outdoor Unit Inspection Display

Normal Operation Indicators

Details how LED indicators show normal operating status.

Abnormal Condition Indicators

Details how LED indicators and A-Control Service Tool display abnormalities and operating conditions.

11 EASY MAINTENANCE FUNCTION

Maintenance Mode Operations

Guides on entering maintenance mode, checking data, and fixing Hz operation for easier inspection.

Fixed Hz Operation Mode

Allows fixing the operating frequency to stabilize inverter model inspection.

Guide for Operation Condition Analysis

Provides a guide for checking operation conditions using temperature differences and graphs.

12 FUNCTION SETTING

Unit Function Settings via Remote Controller

Instructions for setting various unit functions like temperature detection, refrigerant address, and model using remote controllers.

Monitoring Operation Data with Remote Controller

Procedures for using the remote controller to monitor operational data and request codes.

Request Code List for Data Monitoring

A comprehensive list of request codes for monitoring various operational parameters and statuses.

14 DISASSEMBLY PROCEDURE

Removing Panels and Fan Motor

Steps for removing outer panels and the fan motor assembly.

Removing Electrical Components and Sensors

Instructions for disassembling the electrical parts box and removing various thermistor sensors.

Removing Valves, Switches, and Reactors

Procedures for removing the 4-way valve coil, linear expansion valve, bypass valve coil, high/low pressure switches, and reactor.

Removing Compressor and Accumulator

Steps for safely removing the compressor and accumulator, including refrigerant recovery.

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