Mitsubishi Electric PUY-A24NHA 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-A24NHA Specifications

General

Brand	Mitsubishi Electric
Model	PUY-A24NHA
Category	Air Conditioner
Language	English

Summary

TECHNICAL CHANGES

REFERENCE MANUAL

Provides references to related manuals for further information.

SAFETY PRECAUTION

Outlines essential safety precautions for handling refrigerant and equipment.

FEATURES

CHARGELESS SYSTEM

Explains the chargeless system and its benefits for installation.

SPECIFICATIONS

DATA

REFILLING REFRIGERANT CHARGE (R410A : oz, kg)

Lists refrigerant quantities required for different piping lengths.

COMPRESSOR TECHNICAL DATA

Provides technical specifications for the compressor.

NOISE CRITERION CURVES

Presents noise level data across different frequency bands.

STANDARD OPERATION DATA

Provides standard operational data for the unit.

OUTLINES AND DIMENSIONS

Free space around the outdoor unit

Specifies the required clearance around the outdoor unit for installation.

FOUNDATION BOLTS

Details the requirements for foundation bolts installation.

PIPING-WIRING DIRECTION

Describes the direction for piping and wiring connections.

WIRING DIAGRAM

WIRING SPECIFICATIONS

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

Details wiring specifications for indoor units powered by outdoor units.

M-NET WIRING METHOD

Explains the proper wiring method for the M-NET communication system.

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

CHECK POINT UNDER TEST RUN

Lists critical checks to perform before and during a test run.

HOW TO PROCEED "SELF-DIAGNOSIS"

Provides detailed steps for performing self-diagnosis for troubleshooting.

SELF-DIAGNOSIS ACTION TABLE

A table detailing actions for various error codes detected during power-on.

TROUBLESHOOTING BY INFERIOR PHENOMENA

Guides users on troubleshooting common operational issues and symptoms.

HOW TO CHECK THE PARTS

Provides methods for checking the resistance of various internal components.

HOW TO CHECK THE COMPONENTS

Details how to check thermistor characteristics and resistance values.

EMERGENCY OPERATION

Explains how to perform emergency operation when normal control fails.

TEST POINT DIAGRAM

Illustrates test points on the outdoor controller circuit board for diagnostics.

EASY MAINTENANCE FUNCTION

MAINTENANCE MODE OPERATION METHOD

Guides on how to use the maintenance mode for checking operation data.

GUIDE FOR OPERATION CONDITION

Provides a guide to determine the operation state based on temperature differences.

FUNCTION SETTING

UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER

Explains how to set unit functions using the remote controller.

Selecting functions using the wired remote controller

Details the procedure for selecting functions via a wired remote controller.

Selecting functions using the wireless remote controller (Type C)

Guides on selecting functions using a wireless remote controller.

FUNCTION SELECTION OF REMOTE CONTROLLER

Lists selectable functions and their settings via the remote controller.

Function selection of wireless remote controller TEMPERATURE DISPLAY C/F SETTING

Explains how to change temperature display units (C/F) using the wireless remote controller.

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

HOW TO "MONITOR THE OPERATION DATA"

Provides instructions on how to monitor operation data via the remote controller.

REQUEST CODE LIST

Lists available request codes for monitoring operation data.

DISASSEMBLY PROCEDURE

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

Step-by-step guide to remove outer panels of the unit.

Removing the fan motor

Instructions for safely removing the fan motor assembly.

Removing the electrical parts box

Procedure for removing the electrical components box.

Removing the thermistor <Outdoor 2-phase pipe> (TH6)

Steps for removing the outdoor 2-phase pipe thermistor.

Removing the thermistor <Outdoor> (TH7)

Instructions for removing the outdoor thermistor.

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

Steps for removing outdoor pipe and discharge thermistors.

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

Procedure to remove solenoid valve coils and linear expansion valve coil.

Removing the four-way valve

Steps for removing the four-way valve assembly.

Removing linear expansion valve

Instructions for removing the linear expansion valve.

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

Steps for removing high and low pressure switches.

Removing the reactor (DCL) and capacitor (CE)

Procedure for removing the reactor and capacitor.

Removing the compressor (MC)

Detailed steps for removing the compressor.

Removing the accumulator

Instructions for removing the accumulator.

PARTS LIST (non-RoHS compliant)

RoHS PARTS LIST (RoHS compliant)