Mitsubishi Electric PUMY-P125VMA User Manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGE ·····································2
2. SAFETY PRECAUTION····································3
3. OVERVIEW OF UNITS······································5
4. SPECIFICATIONS·············································8
5. DATA ·······························································10
6. OUTLINES AND DIMENSIONS······················18
7. WIRING DIAGRAM ·········································19
8. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION ···22
9. TROUBLESHOOTING ····································34
10. ELECTRICAL WIRING····································72
11. REFRIGERANT PIPING TASKS·····················75
12. DISASSEMBLY ···············································80
13. PARTS LIST ····················································86
Outdoor unit
[Model name] [Service Ref.]
PUMY-P125VMA PUMY-P125VMA
PUMY-P125YMA PUMY-P125YMA
PUMY-P125YMA
1
No.OC272
REVISED EDITION-A
2003
SPLIT-TYPE, HEAT PMUP AIR CONDITIONERS
R407C
Revision :
• PUMY-P125VMA and
PUMY-P125YMA1 are
added in REVISED
EDITION-A.
• Please void OC272.
OUTDOOR UNIT
OC272A--1.qxp 03.9.4 11:06 AM Page 1

Mitsubishi Electric PUMY-P125VMA Specifications

General

Model	PUMY-P125VMA
Cooling Capacity	12.5 kW
Heating Capacity	14.0 kW
Refrigerant	R410A
Type	Heat Pump

Summary

TECHNICAL CHANGE

SAFETY PRECAUTION

SPECIFICATIONS

WIRING DIAGRAM

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

TRANSMISSION SYSTEM SETUP

Outlines the setup requirements for transmission systems, including wiring and address settings.

REFRIGERANT SYSTEM DIAGRAM

Illustrates the refrigerant system diagram, including piping specifications and component details.

SYSTEM CONTROL

Details system control methods using M-NET and MA remote controllers for various system configurations.

TROUBLESHOOTING

CHECK POINTS FOR TEST RUN

Provides procedures and checks for performing a test run of the air conditioning system.

Special Function Operation and Settings (for M-NET Remote Controller)

Explains special functions and settings for M-NET remote controllers, including group and paired settings.

Countermeasures for Error During Test Run

Lists error codes and their corresponding countermeasures during test run operations.

Remote controller diagnosis

Details the diagnosis function for MA remote controllers when units do not operate correctly.

Remote controller trouble

Describes common symptoms and troubleshooting steps for remote controller issues.

INTERNAL SWITCH FUNCTION TABLE

Provides tables for internal switch functions on the outdoor unit for configuration and operation.

Outdoor unit input/output connector

HOW TO CHECK THE PARTS

Guides on how to check various parts, including thermistors, fan motors, and valves, using a tester.

OUTDOOR UNIT FUNCTIONS

ELECTRICAL WIRING

OVERVIEW OF POWER WIRING

DESIGN FOR CONTROL WIRING

EXAMPLE EXTERNAL WIRING DIAGRAM FOR A BASIC SYSTEM

REFRIGERANT PIPING TASKS

REFRIGERANT PIPING SYSTEM

Details the refrigerant piping system, including line-branch and header-branch methods, and pipe selection.

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

Outlines precautions against refrigerant leakage, including concentration limits and confirmation procedures.