Mitsubishi Electric PUY-A24NHA7-BS 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-A24NHA7-BS Specifications

General

Power Supply	220-240 V, 50 Hz
Refrigerant	R410A
Outdoor Unit Noise Level	50 dB(A)
Cooling Capacity	24000 BTU
Energy Efficiency Ratio (Cooling)	3.5
Seasonal Energy Efficiency Ratio (SEER)	16 SEER
Outdoor Unit Dimensions (H x W x D)	550 x 800 x 290 mm
Weight (Indoor Unit)	35 lb
Weight (Outdoor Unit)	150 lb
Indoor Unit Dimensions (WxHxD)	1000 x 300 x 230 mm
Outdoor Unit Dimensions (WxHxD)	800 x 550 x 290 mm
Indoor Unit Weight	35 lb
Outdoor Unit Weight	150 lb
Heating Capacity	24000 BTU

Summary

SPECIFICATIONS

REFILLING REFRIGERANT CHARGE

STANDARD OPERATION DATA

Operational data including temperatures, pressures, and capacities.

WIRING DIAGRAM

WIRING SPECIFICATIONS

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

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

TROUBLESHOOTING

General troubleshooting actions based on reoccurring or non-reoccurring issues.

CHECK POINT UNDER TEST RUN

Pre-test run checks and procedures to ensure proper operation.

Test run for wired remote controller

Detailed steps for performing a test run using the wired remote controller.

Checking the error information

How to view error codes and information on the remote controller.

Error history

HOW TO PROCEED "SELF-DIAGNOSIS"

Self-diagnosis

Steps for initiating and understanding the self-diagnosis function.

Remote controller check

Procedure for diagnosing the remote controller's functionality.

SELF-DIAGNOSIS ACTION TABLE

Abnormalities detected while unit is operating

Lists and explains abnormal conditions detected during unit operation.

U3 to U8 Error Codes

Details on specific error codes related to thermistors, fan motors, and power modules.

U9 Error Code Details

Detailed explanation of U9 error codes for voltage and current anomalies.

UF, UH, UL, UP Error Codes

Troubleshooting for compressor overcurrent, current sensor, low pressure, and fan errors.

Communication Error Codes (E0-E6)

Explanations and troubleshooting for remote controller and unit communication errors.

Communication Error Codes (E8-Ed, P8)

Troubleshooting for communication errors and pipe temperature issues.

M-NET Communication Errors (A0, A2, A3, A6)

TROUBLESHOOTING OF PROBLEMS

Troubleshooting: "PLEASE WAIT" Display Issues

Diagnosis flow for issues when "PLEASE WAIT" is displayed on the remote controller.

Troubleshooting: Remote Controller No Display

Steps to diagnose why the remote controller display is blank.

Troubleshooting: Remote Controller Display Problems

HOW TO CHECK THE PARTS

10-6-1. Check method of outdoor controller circuit board

Procedure for checking the outdoor controller circuit board.

10-6-2. Check method of outdoor controller circuit board

Diagnostic steps for the outdoor controller circuit board.

10-6-3. Check method of power circuit board

Procedure for checking the power circuit board.

10-6-4. Check method of power circuit board

Diagnostic steps for the power circuit board.

10-6-5. Check method of DC fan motor (fan motor/outdoor controller circuit board)

How to check the DC fan motor and its associated circuit board.

HOW TO CHECK THE COMPONENTS

EMERGENCY OPERATION

Check codes for Emergency Operation

List of check codes that allow for emergency operation.

Operation data during emergency operation

TEST POINT DIAGRAM

FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS

(1) Function of switches

Explanation of the functions assigned to DIP and push switches.

(2) Function of connector

Display function of inspection for outdoor unit

<Display function of inspection for outdoor unit>

How to interpret LED indicators and check codes for outdoor unit diagnostics.

Abnormal Condition Error Codes

Listing and explanation of various error codes indicating abnormal conditions.

<Outdoor unit operation monitor function>

EASY MAINTENANCE FUNCTION

Smooth maintenance

Function to display detailed operational data like temperatures and compressor status.

INITIAL SETTINGS FOR REFRIGERANT LEAKAGE DETECTION FUNCTION

PAR-3xMAA

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

HOW TO "MONITOR THE OPERATION DATA"

REQUEST CODE LIST

Request Code List (Continued)

13-2-1. Detail Contents in Request Code

Detail Contents in Request Code (Continued)

DISASSEMBLY PROCEDURE

1. Removing External Panels and Fan Motor

2. Removing Electrical Parts Box and Thermistors

3. Removing Valve Components and Switches

4. Removing Reactor, Capacitor, Compressor, and Power Receiver

Procedure for removing major internal components like compressor and power receiver.