Mitsubishi Electric PUMY-P48NKMU2 User Manual

TECHNICAL & SERVICE MANUAL
OUTDOOR UNIT
No. OCH695
REVISED EDITION-B
HFC
utilized
R410A
June 2021
Note:
•
This service manual
describes technical data of
the outdoor units only.
Revision:
•
Precaution in 1. SAFETY
PRECAUTION has been
added in REVISED
EDITION-B.
<Outdoor unit>
[Model Name]
Model name
indication
PARTS CATALOG (OCB695)
PUMY-P36NKMU2
PUMY-P48NKMU2
PUMY-P60NKMU2
PUMY-HP36NKMU
PUMY-HP48NKMU
PUMY-P36NKMU2-BS
PUMY-P48NKMU2-BS
PUMY-P60NKMU2-BS
Salt proof model
PUMY-P36NKMU2
PUMY-P48NKMU2
PUMY-P60NKMU2
PUMY-HP36NKMU
PUMY-HP48NKMU
PUMY-P36NKMU2-BS
PUMY-P48NKMU2-BS
PUMY-P60NKMU2-BS
[Service Ref.]
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OCH695A is void.
CONTENTS
1. SAFETY PRECAUTION ·······················2
2. OVERVIEW OF UNITS ························5
3. SPECIFICATIONS ···························· 10
4. DATA ·············································· 12
5. OUTLINES AND DIMENSIONS ··········· 32
6. WIRING DIAGRAM ··························· 34
7. NECESSARY CONDITIONS
FOR SYSTEM CONSTRUCTION ········· 37
8. TROUBLESHOOTING ······················· 48
9. ELECTRICAL WIRING ·····················124
10. REFRIGERANT PIPING TASKS ·········129
11. DISASSEMBLY PROCEDURE ···········136

Mitsubishi Electric PUMY-P48NKMU2 Specifications

General

Refrigerant	R410A
Type	Heat Pump
Phase	Single
Cooling Capacity	48000 BTU/h
Heating Capacity	54000 BTU/h
Indoor Unit Dimensions (HxWxD)	295 x 800 x 223 mm

Summary

SAFETY PRECAUTION

1-1. CAUTIONS RELATED TO NEW REFRIGERANT

Precautions for handling new refrigerants, tools, and safety measures.

Cautions for refrigerant piping work

Guidelines and precautions for refrigerant piping installation and maintenance.

SYSTEM SPECIFICATIONS

SPECIFICATIONS

DATA

4-1. SELECTION OF COOLING/HEATING UNITS

Flowchart for determining capacity and selecting indoor/outdoor units.

CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING

WIRING DIAGRAM

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

8-1. CHECKPOINTS FOR TEST RUN

Procedures and checkpoints for system operation before testing.

8-1-1-2. Test run for wired remote controller <PAR-3*MAA>

Steps for performing a test run using a wired remote controller.

8-1-2. Countermeasures For Error During Test Run

Tables and procedures for identifying and resolving errors during test runs.

8-1-3. SELF-DIAGNOSIS ACTION BY FLOWCHART

Flowchart for diagnosing serial communication errors.

Error Code Diagnostics

Detailed troubleshooting for specific error codes and system malfunctions.

HOW TO CHECK THE PARTS

<LOW PRESSURE SENSOR>

Comparing low pressure sensor measurement with gauge pressure and sensor configuration.

<HIGH PRESSURE SENSOR>

Comparing high pressure sensor measurement with gauge pressure and sensor configuration.

ELECTRICAL WIRING

9-2-2. Cross section area of Wire for Main Power and ON/OFF capacities

Wire thickness, breaker capacity, and ampacity specifications for power wiring.

9-4. WIRING TRANSMISSION CABLES

Details on types, diameters, and lengths of transmission and remote control cables.

REFRIGERANT PIPING SYSTEM

10-1. PUMY-(H)P36/48

Details on refrigerant piping system, diameter selection, and additional charge calculation.

10-1-2. PUMY-P60

Details on refrigerant piping system, diameter selection, and additional charge calculation for PUMY-P60.

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

10-2-1. Introduction

Introduction to R410A refrigerant properties and concentration limits.

10-2-2. Confirming procedure of R410A concentration

DISASSEMBLY PROCEDURE

13. Removing the compressor (MC)