Mitsubishi Electric PUY-A42NKA7 User Manual

1
SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL ································· 2
2. SAFETY PRECAUTION ································· 2
3. FEATURES ····················································· 7
4. SPECIFICATIONS ·········································· 8
5. DATA ····························································· 10
6. OUTLINES AND DIMENSIONS ··················· 14
7. WIRING DIAGRAM ······································ 17
8. WIRING SPECIFICATIONS ·························· 20
9. REFRIGERANT SYSTEM DIAGRAM ············· 21
10. TROUBLESHOOTING ·································· 24
11. EASY MAINTENANCE FUNCTION·············· 84
12. FUNCTION SETTING ··································· 87
13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ·····95
14. DISASSEMBLY PROCEDURE ··················· 104
R410A
Outdoor unit
[Model Name]
PUZ-A12NKA7
PUZ-A18NKA7
PUZ-A24NHA7
PUZ-A30NHA7
PUZ-A36NKA7
PUZ-A42NKA7
PUZ-A12NKA7-BS
PUZ-A18NKA7-BS
PUZ-A24NHA7-BS
PUZ-A30NHA7-BS
PUZ-A36NKA7-BS
PUZ-A42NKA7-BS
PUY-A12NKA7
PUY-A18NKA7
PUY-A24NHA7
PUY-A30NHA7
PUY-A36NKA7
PUY-A42NKA7
PUY-A12NKA7-BS
PUY-A18NKA7-BS
PUY-A24NHA7-BS
PUY-A30NHA7-BS
PUY-A36NKA7-BS
PUY-A42NKA7-BS
[Service Ref.]
PUZ-A12NKA7
PUZ-A18NKA7
PUZ-A24NHA7
PUZ-A30NHA7
PUZ-A36NKA7
PUZ-A42NKA7
PUZ-A12NKA7-BS
PUZ-A18NKA7-BS
PUZ-A24NHA7-BS
PUZ-A30NHA7-BS
PUZ-A36NKA7-BS
PUZ-A42NKA7-BS
PUY-A12NKA7
PUY-A18NKA7
PUY-A24NHA7
PUY-A30NHA7
PUY-A36NKA7
PUY-A42NKA7
PUY-A12NKA7-BS
PUY-A18NKA7-BS
PUY-A24NHA7-BS
PUY-A30NHA7-BS
PUY-A36NKA7-BS
PUY-A42NKA7-BS
PUZ-A12/18NKA7
PUY-A12/18NKA7
PARTS CATALOG (OCB636)
Notes:
•Thismanualdescribesservice
dataoftheoutdoorunitsonly.
• RoHScompliantproductshave
<G> markonthespecname
plate.
SPLIT-TYPE,HEATPUMPAIRCONDITIONERS
SPLIT-TYPE,AIRCONDITIONERS
February 2017
No. OCH636
REVISED EDITION-A
Revision:
•
CorrectedtheSHFvaluein
"5-4.STANDARDOPERATION
DATA"inREVISEDEDITION-A.
• Somedescriptionshavebeen
modified.
• OCH636 isvoid.

Mitsubishi Electric PUY-A42NKA7 Specifications

General

Brand	Mitsubishi Electric
Model	PUY-A42NKA7
Category	Air Conditioner
Language	English

Summary

Safety Precautions

Always Observe for Safety

Guidelines for safe operation and maintenance procedures.

Cautions Related to New Refrigerant

Cautions for Refrigerant Piping Work

Data

Refilling Refrigerant Charge (R410A: oz, kg)

Table detailing refrigerant charge amounts for various piping lengths.

Standard Operation Data

Heat Pump

Standard operation data for heat pump models.

Cooling Only

Wiring Diagram

Wiring Diagram for PUZ-A12/18NKA7 and PUY-A12/18NKA7 Series

Wiring diagram for PUZ-A12/18NKA7 and PUY-A12/18NKA7 series outdoor units.

Wiring Diagram for PUZ-A24/30NHA7 and PUY-A24/30NHA7 Series

Wiring diagram for PUZ-A24/30NHA7 and PUY-A24/30NHA7 series outdoor units.

Wiring Diagram for PUZ-A36/42NKA7 and PUY-A36/42NKA7 Series

Wiring diagram for PUZ-A36/42NKA7 and PUY-A36/42NKA7 series outdoor units.

Refrigerant System Diagram

Refrigerant System Diagram for PUZ-A12/18NKA7 Series

Refrigerant system diagram for PUZ-A12/18NKA7 series outdoor units.

Refrigerant System Diagram for PUY-A12/18NKA7 Series

Refrigerant system diagram for PUY-A12/18NKA7 series outdoor units.

Refrigerant System Diagram for PUZ-A24/30NHA7 and PUZ-A36/42NKA7 Series

Refrigerant system diagram for PUZ-A24/30NHA7 and PUZ-A36/42NKA7 series.

Refrigerant System Diagram for PUY-A24/30NHA7 and PUY-A36/42NKA7 Series

Refrigerant system diagram for PUY-A24/30NHA7 and PUY-A36/42NKA7 series.

Refrigerant Collecting (Pump Down)

Refrigerant Pipe Airtight Testing Method

Troubleshooting

Troubleshooting

Table summarizing check codes and actions for reoccurring and non-reoccurring troubles.

Check Point Under Test Run

Pre-test run checks including leak detection, impedance measurement, and switch settings.

Test Run Operation

Procedure for performing test run operations using the wired remote controller.

Error Information

Procedure for checking and resetting error information displayed on the remote controller.

Checking the Error Information

Method to view error information and history from the main menu.

Error History

Procedure to view and delete error history records.

Deleting the Error History

Steps to delete error history from the check menu.

Test Run for IR Wireless Remote Controller

Procedure for performing test run using an IR wireless remote controller.

How to Proceed "Self-Diagnosis"

Steps for performing self-diagnosis using the wired remote controller.

Resetting the Error History

Procedure for resetting error history after self-diagnosis.

Remote Controller Check

Procedure for checking the remote controller's functionality.

Abnormalities Detected While Unit Is Operating

List of abnormalities detected during unit operation with troubleshooting steps.

High Pressure (High-pressure switch 63H operated)

Troubleshooting for high pressure switch activation during compressor operation.

High Discharge Temperature

Troubleshooting for high discharge or high compressor surface temperatures.

Open/Short Circuit of Outdoor Unit Temperature Thermistor (TH4, TH33)

Troubleshooting for open/short circuits in TH4 and TH33 thermistors.

Open/Short of Outdoor Unit Thermistors (TH3, TH6, TH7, TH8 and TH32)

Troubleshooting for open/short circuits in various outdoor unit thermistors.

Temperature of Heat Sink

Troubleshooting for abnormal heat sink temperatures detected by TH8.

Power Module

Troubleshooting for power module abnormalities like overcurrent.

Outdoor Fan Motor

Troubleshooting for abnormal rotational frequency of the outdoor DC fan motor.

Overvoltage Error

Troubleshooting for overvoltage errors related to DC bus voltage.

Undervoltage Error

Troubleshooting for undervoltage errors related to DC bus voltage.

Input Current Sensor Error

Troubleshooting for errors related to low input current.

Abnormal Power Synchronous Signal

Troubleshooting for abnormal power synchronous signals.

PFC Error (Overvoltage/Undervoltage/Overcurrent)

Troubleshooting for PFC errors including over/undervoltage and overcurrent.

Compressor Overcurrent Interruption (When Compressor Locked)

Troubleshooting for compressor overcurrent interruption when locked.

Current Sensor Error

Troubleshooting for current sensor errors.

Low Pressure

Troubleshooting for low pressure conditions during heating or cooling.

Compressor Overcurrent Interruption

Troubleshooting for compressor overcurrent interruption after startup.

Remote Controller Transmission Error (E0)/Signal Receiving Error (E4)

Troubleshooting remote controller transmission and signal receiving errors.

Remote Controller Control Board

Troubleshooting for abnormalities in the remote controller control board.

Remote Controller Transmission Error (E3)/Signal Receiving Error (E5)

Troubleshooting remote controller transmission and signal receiving errors.

Indoor/Outdoor Unit Communication Error (Signal Receiving Error)

Troubleshooting indoor/outdoor unit communication errors (signal receiving).

Indoor/Outdoor Unit Communication Error (Transmitting Error)

Troubleshooting indoor/outdoor unit communication errors (transmitting).

Remote Controller Signal Receiving Error is Detected by Remote Controller

Troubleshooting remote controller signal receiving errors detected by the remote controller.

Remote Controller Transmitting Error is Detected by Remote Controller

Troubleshooting remote controller transmitting errors detected by the remote controller.

Remote Controller Signal Receiving Error is Detected by Indoor Unit

Troubleshooting remote controller signal receiving errors detected by the indoor unit.

Remote Controller Transmitting Error is Detected by Indoor Unit

Troubleshooting remote controller transmitting errors detected by the indoor unit.

Abnormal Refrigerant Circuit

Troubleshooting for abnormal refrigerant circuit conditions.

Indoor/Outdoor Unit Communication Error (Signal Receiving Error) (Outdoor Unit)

Troubleshooting signal receiving errors in outdoor unit communication.

Indoor/Outdoor Unit Communication Error (Transmitting Error) (Outdoor Unit)

Troubleshooting transmitting errors in outdoor unit communication.

Serial Communication Error

Troubleshooting serial communication errors between boards.

Abnormal if Communication Between Outdoor Controller Circuit Board and M-NET Board is Not Available

Troubleshooting communication issues between controller and M-NET boards.

Pipe Temperature

Troubleshooting abnormal pipe temperatures in cooling and heating modes.

M-NET Communication Error

Categories for M-NET communication errors.

Address Duplicate Definition

Troubleshooting errors caused by duplicate controller addresses in M-NET communication.

Hardware Error of Transmission Processor

BUS BUSY

Communication Error with Communication Processor

NO ACK Signal

Troubleshooting NO ACK signals in M-NET communication.

M-NET NO RESPONSE

Troubleshooting M-NET NO RESPONSE errors.

Troubleshooting of Problems

Remote Controller Display Does Not Work

Troubleshooting steps when the remote controller display is not working.

“PLEASE WAIT” Display is Remained on the Remote Controller

Low Cooling/Heating Capacity

“PLEASE WAIT” Display Symptom

Remote Controller Display Not Shown Symptom 1

Remote Controller Display Not Shown Symptom 2

Remote Controller Display Not Shown Symptom 3

Insufficient Cooling/Heating Performance

How to Check the Parts

Check Method of Outdoor Controller Circuit Board

Check Method of Power Circuit Board

Check Method of DC Fan Motor (Fan Motor/Outdoor Controller Circuit Board)

How to Check the Components

Thermistor Feature Chart

Emergency Operation

Conditions and Procedure for Emergency Operation

Items and Cautions for Emergency Operation

Emergency Operation Procedure

Releasing Emergency Operation

Test Point Diagram

Outdoor Controller Circuit Board

Outdoor Power Circuit Board

Display Function of Inspection for Outdoor Unit

Abnormal Condition

Table of check codes, LED indicators, and inspection methods for abnormal conditions.

Initial Settings for Refrigerant Leakage Detection Function

Initial Settings for Refrigerant Leakage Detection Function

Resetting the Initial Learning Data

Selecting Functions Using the Wired Remote Controller

Selecting Functions Using the IR Wireless Remote Controller (Type C)

Function Selection of IR Wireless Remote Controller

Temperature Display °C/°F Setting

Monitoring the Operation Data by the Remote Controller

How to "Monitor the Operation Data"

Request Code List

Detail Contents in Request Code

Error Content (U9)

Disassembly Procedure

Removing the Compressor (MC)

Removing the Power Receiver