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Mitsubishi Electric PUZ-A18NHA User Manual

Mitsubishi Electric PUZ-A18NHA
136 pages
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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

Table of Contents

Questions and Answers:

Mitsubishi Electric PUZ-A18NHA Specifications

General IconGeneral
BrandMitsubishi Electric
ModelPUZ-A18NHA
CategoryAir Conditioner
LanguageEnglish

Summary

SERVICE MANUAL

REFERENCE MANUAL

2-1. INDOOR UNIT

Lists indoor unit models and their service manual numbers.

2-2. TECHNICAL DATA BOOK

Mentions the manual number for technical data.

SAFETY PRECAUTION

3-1. ALWAYS OBSERVE FOR SAFETY

General safety instruction before accessing terminals.

3-2. CAUTIONS RELATED TO NEW REFRIGERANT R410A

Cautions for using R410A refrigerant.

FEATURES

CHARGELESS SYSTEM

Pre-charged refrigerant for piping length at shipment.

SPECIFICATIONS

DATA

6-1. REFILLING REFRIGERANT CHARGE

Table showing refrigerant charge amounts by piping length.

6-2. COMPRESSOR TECHNICAL DATA

Technical data for compressors, including winding resistance.

6-3. NOISE CRITERION CURVES

Graphs showing noise levels by frequency for different models.

6-4. STANDARD OPERATION DATA

Tables detailing operation data for heat pump and cooling modes.

OUTLINES AND DIMENSIONS

Free space around the outdoor unit

Illustrates minimum installation space around the unit.

FOUNDATION BOLTS

Guidance on securing the unit with foundation bolts.

PIPING-WIRING DIRECTION

Shows where piping and wiring connections are made.

WIRING DIAGRAM

M-NET ADAPTER

Table of symbols and names for M-NET adapter components.

Cautions when Servicing

Safety warning regarding capacitor discharge.

WIRING SPECIFICATIONS

9-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT

Details connection patterns and wire sizes for A-control.

9-2. M-NET WIRING METHOD

Guidelines for M-NET wiring to prevent noise and ensure proper connection.

9-3. Regulations in address settings

Rules for address settings in grouped systems.

9-3. Regulations in address settings

9-3-1. M-NET address setting

How to set M-NET addresses using rotary switches.

9-3-2. Refrigerant address setting

How to set refrigerant addresses using DIP switches.

9-3-3. Regulations in address settings

Rules for address settings in grouped systems.

REFRIGERANT SYSTEM DIAGRAM

<4-way valve solenoid coil>

Notes on the 4-way valve solenoid coil operation.

TROUBLESHOOTING

11-1. TROUBLESHOOTING

Summary table of error codes and actions based on phenomenon recurrence.

11-2. CHECK POINT UNDER TEST RUN

Pre-run checks and procedures for test runs.

11-4. SELF-DIAGNOSIS ACTION TABLE

Table detailing error codes and actions for power-on abnormalities.

11-5. TROUBLESHOOTING BY INFERIOR PHENOMENA

Troubleshooting guide for various symptoms and factors.

HOW TO PROCEED "SELF-DIAGNOSIS"

11-3-1. When a Problem Occurs During Operation

How to read error codes and clear them.

11-3-2. Self-Diagnosis During Maintenance or Service

Recalling error history and checking results.

11-3-3. Remote Controller Diagnosis

Troubleshooting steps for remote controller malfunctions.

11-3-4. Malfunction-diagnosis method by wireless remote controller

Procedure for diagnosing malfunctions with wireless remote.

EASY MAINTENANCE FUNCTION

12-1.MAINTENANCE MODE OPERATION METHOD

Steps to enter and use maintenance mode for checking data.

FUNCTION SETTING

13-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER

Table of functions and settings adjustable via remote.

13-1-1. Selecting functions using the wired remote controller

Procedure for setting functions via wired remote.

13-1-2. Selecting functions using the wireless remote controller

Procedure for setting functions via wireless remote.

FUNCTION SELECTION OF REMOTE CONTROLLER

13-2. FUNCTION SELECTION OF REMOTE CONTROLLER

Details on remote controller functions like language, lock, mode, display.

13-3. Function selection of wireless remote controller TEMPERATURE DISPLAY C/F SETTING

How to change temperature display between Celsius and Fahrenheit.

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

14-1. HOW TO "MONITOR THE OPERATION DATA"

Steps to access and view operation data via remote.

14-2. REQUEST CODE LIST

List of request codes for monitoring operation data.

14-2. REQUEST CODE LIST

[Operation state] (Request code "0")

Details on monitoring operation states.

[Indoor unit – Control state] (Request code "50")

Information on indoor unit control states.

[Outdoor unit – Control state] (Request code "51")

Information on outdoor unit control states.

[Compressor – Frequency control state] (Request code "52")

Details on compressor frequency control states.

DISASSEMBLY PROCEDURE

1. Removing the top panel, service panel, front panel and back panel

Step-by-step guide to remove exterior panels.

2. Removing the fan motor

Procedure to remove the fan motor assembly.

3. Removing the electrical parts box

How to remove the electrical components box.

4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) and thermistor <Outdoor pipe> (TH3)

Steps to remove outdoor thermistors TH6 and TH3.

5. Removing the thermistor <Outdoor> (TH7)

Procedure to remove outdoor thermistor TH7.

6. Removing the thermistor <Outdoor pipe> (TH3) and thermistor <Discharge> (TH4)

Steps to remove thermistors TH3 and TH4.

7. Removing the solenoid valve coil <Four-way valve> (21S4), linear expansion valve coil (LEV-A) and solenoid valve coil <Bypass valve> (SV)

How to remove solenoid valve coils and LEV-A.

8. Removing the four-way valve

Procedure to remove the four-way valve.

9. Removing linear expansion valve

Steps to remove the linear expansion valve.

10. Removing the high pressure switch (63H) and low pressure switch (63L)

How to remove high and low pressure switches.

11. Removing the reactor (DCL) and capacitor (CE)

Procedure to remove reactor and capacitor.

12. Removing the compressor (MC)

Steps to remove the compressor.

13. Removing the accumulator

Procedure to remove the accumulator.

PARTS LIST (non-RoHS compliant)

STRUCTURAL PARTS PUZ-A18NHA PUY-A12NHA PUY-A18NHA

List of structural parts for specific models.

FUNCTIONAL PARTS PUZ-A18NHA PUY-A12NHA PUY-A18NHA

RoHS PARTS LIST (RoHS compliant)

FUNCTIONAL PARTS PUZ-A18NHA PUZ-A18NHA-BS PUY-A12NHA1 PUY-A12NHA1-BS PUY-A18NHA1 PUY-A18NHA1-BS

List of RoHS compliant functional parts for specific models.

FUNCTIONAL PARTS PUZ-A18NHA PUZ-A18NHA-BS PUY-A12NHA1 PUY-A12NHA1-BS PUY-A18NHA1 PUY-A18NHA1-BS

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