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Mitsubishi Electric PUZ-A18NHA4 User Manual

Mitsubishi Electric PUZ-A18NHA4
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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 PUZ-A18NHA4 Specifications

General IconGeneral
Cooling Capacity (kW)5.0
RefrigerantR410A
Phase1
Outdoor Unit Noise Level50
SeriesPUZ
Heating Capacity (kW)5.6 kW
Voltage (V)208/230
Hertz (Hz)50
Coefficient of Performance (Heating)4.0
Outdoor Unit Dimensions (HxWxD)540 x 800 x 290
Indoor Unit Dimensions (HxWxD)290 x 900 x 210

Summary

REFERENCE MANUAL

INDOOR UNIT

Lists indoor unit models, service references, and manual numbers.

SAFETY PRECAUTION

ALWAYS OBSERVE FOR SAFETY

General safety instructions before accessing electrical terminals.

CAUTIONS RELATED TO NEW REFRIGERANT

Specific safety precautions for R410A refrigerant.

CAUTIONS FOR REFRIGERANT PIPING WORK

Pipe Thickness and Flare Dimensions

Specifies pipe thickness and flare dimensions for R410A due to higher working pressure and air tightness.

R410A Service Tools

Table showing compatibility of R410A tools with R22 tools.

FEATURES

CHARGELESS SYSTEM

Pre-charged refrigerant system for specific piping lengths.

SPECIFICATIONS

DATA

Refrigerant Charge Data

Table detailing refrigerant charge amounts based on piping length.

Compressor Technical Data

Technical specifications for compressors, including winding resistance.

NOISE CRITERION CURVES

Noise level curves for different unit models in cooling and heating modes.

Standard Operation Data

Standard operation data for various models.

Heat Pump Operation Data

Standard operation data for heat pump models in cooling and heating.

Cooling Only Operation Data

Standard operation data for cooling-only models.

OUTLINES AND DIMENSIONS

Outdoor Unit Installation Clearances

Specifies minimum clearances required around the outdoor unit for installation.

FOUNDATION BOLTS

Instructions for securing the unit with foundation bolts.

PIPING-WIRING DIRECTIONS

Indicates that piping and wiring connections are made from the rear direction only.

Piping Knockout Hole Details

Details the locations and types of knockout holes for piping and wiring.

WIRING DIAGRAM

MODEL SELECT

Explains the model selection using DIP switches SW6 and SW5.

M-NET COMMUNICATION ADAPTER

Lists components and their functions related to the M-NET adapter.

WIRING SPECIFICATIONS

INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application)

Details wiring specifications for systems where the outdoor unit supplies power to the indoor unit.

SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES

INDOOR - OUTDOOR CONNECTING CABLE

M-NET WIRING METHOD

M-NET Address Configuration

How to set the M-NET address for outdoor units.

Refrigerant Address Configuration

How to set refrigerant addresses for indoor units in multi-group systems.

Address Setting Regulations

Rules for setting addresses in multiple grouping systems.

REFRIGERANT SYSTEM DIAGRAM

OPERATING PROCEDURES

Refrigerant Recovery (Pump Down)

Procedure for recovering refrigerant when moving units.

Test Run Procedures

Steps to start and finish a test run of the unit.

Wireless Remote Test Run

Procedure for performing a test run using a wireless remote controller.

TROUBLESHOOTING

General Troubleshooting Overview

Summary of actions based on error code display and trouble recurrence.

Test Run Checks

Pre-run checks before starting a test run.

Self-Diagnosis Procedures

Methods for accessing and using self-diagnosis functions.

Self-Diagnosis Action Table

Detailed table of abnormalities, cases, and corrective actions.

Troubleshooting Inferior Phenomena

Diagnosing common operational issues and user complaints.

HOW TO CHECK THE PARTS

Thermistor Testing

Resistance values and check procedures for various thermistors.

Motor and Valve Coil Testing

Checking procedures for motors, solenoid coils, and expansion valves.

Check method of DC fan motor (fan motor / outdoor controller circuit board)

HOW TO CHECK THE COMPONENTS

Low temperature thermistors

Thermistor resistance charts and formulas for low temperature applications.

Medium temperature thermistor

Thermistor resistance charts and formulas for medium temperature applications.

High temperature thermistor

Thermistor resistance charts and formulas for high temperature applications.

Linear Expansion Valve (A12, 18)

Operation Summary and Pulse Signals

Summary of operation and pulse signal interpretation for LEV.

Linear Expansion Valve Operation

Details on linear expansion valve operation based on pulse signals.

Linear Expansion Valve (A24, 30, 42)

Operation Summary and Pulse Signals

Summary of operation and pulse signal interpretation for LEV.

Linear Expansion Valve Operation

Details on linear expansion valve operation based on pulse signals.

How to attach and detach the coil of linear expansion valve (A12, 18)

How to attach and detach the coil of linear expansion valve (A24, 30, 36, 42)

EMERGENCY OPERATION

Emergency Operation Cautions and Procedure

Items to check, cautions, and steps to activate emergency operation.

Releasing Emergency Operation

Procedure to deactivate emergency operation.

Emergency Operation Data

Data items displayed and their values during emergency operation.

TEST POINT DIAGRAM

Outdoor Controller Circuit Board Test Points

Diagram showing test points on the outdoor controller circuit board.

Noise Filter Circuit Board Diagrams

Outdoor Noise Filter Circuit Board

Diagram of the outdoor noise filter circuit board with component labels.

Outdoor Power Circuit Board Diagrams

Outdoor Power Circuit Board

Diagram of the outdoor power circuit board with test points and connections.

Active Filter Module

Active Filter Module Diagram

Diagram and test points for the active filter module.

SWITCHES, CONNECTORS AND JUMPERS

Function of Switches

Details the functions and settings of various DIP and push switches.

Function of Connectors

Details the function of the CN31 connector for emergency operation.

Special Functions

Low-Level Sound Priority Mode

How to enable low-level sound priority mode via external signal.

Demand Control

How to enable demand control via external input for power consumption reduction.

Outdoor Unit Inspection Display

Normal Operating Indicators

Normal LED indicators for the outdoor controller board and A-Control Service Tool.

Abnormal Condition Indicators

Abnormal LED blinking patterns and corresponding error codes/inspection methods.

EASY MAINTENANCE FUNCTION

Maintenance Mode Operation

How to access and operate maintenance mode.

Fixed Hz Operation

How to fix operating frequency for stable inspection.

Data Measurement Selection

How to select data items for display in maintenance mode.

GUIDE FOR OPERATION CONDITION

FUNCTION SETTING

UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER

How to set unit functions using the wired remote controller.

Unit Number Specific Settings

Details on function settings for different unit numbers and system types.

Selecting functions using the wired remote controller

Step-by-step guide for selecting functions via wired remote controller.

Function selection of wireless remote controller

Guide for selecting functions using a wireless remote controller.

Remote Controller Function Selection Details

Detailed procedures for changing language, limits, modes, and displays.

Language Setting

How to select the display language.

Function Limit and Mode Settings

How to set operation limits, automatic mode, and controller roles.

Temperature Limit Settings

How to set temperature limits for cooling, heating, and auto modes.

Display Settings

How to change temperature unit and room air temperature display settings.

Temperature Unit (°C/°F) Setting

Procedure for setting temperature display units (°C/°F) using the wireless remote.

MONITORING THE OPERATION DATA

How to Monitor Operation Data

Steps to enter maintenance monitor mode and request data.

Service Inspection Monitor Operation

How to use the service inspection monitor to view data.

Canceling Operation Data Monitoring

How to exit monitoring mode and return to normal operation.

REQUEST CODE LIST

Request Code Details

Detailed explanations for various request codes related to operation and control states.

Fan and Actuator Control States

Details of fan control states and actuator output states.

Error Content (U9)

Details of error contents (U9) based on request code 55.

Demand Capacity and Input States

Details on contact demand capacity and external input states.

Outdoor Unit Settings

Details on outdoor unit capacity and setting information.

Outdoor Unit Switch Settings

Tables detailing outdoor unit switch settings and corresponding data displays.

Indoor Unit Setting Information

Details on indoor unit model, capacity, and wireless pair settings.

DISASSEMBLY PROCEDURE

Removing External Panels

Steps to remove external panels of the outdoor unit.

Removing the Fan Motor

Steps to remove the fan motor assembly.

Removing the Electrical Parts Box

Steps to remove the electrical parts box.

Removing Thermistors

Steps to remove outdoor thermistors for pipe, phase, shell, and discharge.

Removing Valve Coils and Switches

Steps to remove 4-way valve, LEV, bypass valve coils, and switches.

Removing Major Components

Steps to remove the compressor and accumulator.

Removing Reactor and Capacitor

Steps to remove the reactor and capacitor.

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