Mitsubishi Electric PUMY-P125YKM3 User Manual

158 pages

To Next Page

To Next Page

Page #1 background image

Loading...

Page #1 background image

TECHNICAL & SERVICE MANUAL

OUTDOOR UNIT

HFC

utilized

R410A

March 2017

Note:

•

This service manual

describes technical data of

the outdoor units only.

<Outdoor unit>

[Model Name]

Model name

indication

PARTS CATALOG (OCB632)

PUMY-P112VKM3

PUMY-P125VKM3

PUMY-P140VKM3

PUMY-P112YKM3

PUMY-P125YKM3

PUMY-P140YKM3

PUMY-P112VKM3-BS

PUMY-P125VKM3-BS

PUMY-P140VKM3-BS

PUMY-P112YKM3-BS

PUMY-P125YKM3-BS

PUMY-P140YKM3-BS

Salt proof model

PUMY-P112VKM3

PUMY-P125VKM3

PUMY-P140VKM3

PUMY-P112YKM3 PUMY-P112YKME3

PUMY-P125YKM3 PUMY-P125YKME3

PUMY-P140YKM3 PUMY-P140YKME3

PUMY-P112VKM3-BS

PUMY-P125VKM3-BS

PUMY-P140VKM3-BS

PUMY-P112YKM3-BS PUMY-P112YKME3-BS

PUMY-P125YKM3-BS PUMY-P125YKME3-BS

PUMY-P140YKM3-BS PUMY-P140YKME3-BS

[Service Ref.]

CONTENTS

1. SAFETY PRECAUTION

.....................................

2

2. OVERVIEW OF UNITS

.......................................

5

3. SPECIFICATIONS

............................................

10

4. DATA

.................................................................

13

5. OUTLINES AND DIMENSIONS

.......................

27

6. WIRING DIAGRAM

...........................................

29

7.

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

.......

32

8. TROUBLESHOOTING

......................................

50

9. ELECTRICAL WIRING

...................................

132

10. REFRIGERANT PIPING TASKS

....................

139

11. DISASSEMBLY PROCEDURE

.......................

146

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No. OCH632

REVISED EDITION-A

Revision:

•

Modified the "Ratio of

power input" graph for cool-

ing in "4-2. CORRECTION

BY TEMPERATURE" in

REVISED EDITION-A.

•

Some other descriptions

have been also modified.

OCH632 is void.

Other manuals for Mitsubishi Electric PUMY-P125YKM3

Service Manual44 pages

Questions and Answers:

D
debrasmithAug 14, 2025
What to do if the trouble is not reoccurring and is logged in Mitsubishi Electric Air Conditioner?
- T
  Tiffany CarneyAug 14, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring but is logged, consider temporary defects such as the operation of protection devices in the refrigerant circuit including the compressor, poor wiring connections, or noise. Re-check the symptom, and check the installation environment, refrigerant amount, weather when the trouble occurred, and matters related to wiring. After service, reset check code logs and restart the unit. Note that there may be no abnormality in the electrical components, controller board, remote controller, etc.
A
Alex HubbardAug 17, 2025
What to do if the trouble is not reoccurring and is not logged in Mitsubishi Electric Air Conditioner?
- M
  Misty SotoAug 17, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring and is not logged, re-check the abnormal symptom. Conduct troubleshooting and ascertain the cause of the trouble. If the cause is not ascertained, continue to operate the unit for the time being. Note that there may be no abnormality concerning parts such as electrical components, controller board, remote controller, etc.
C
Christopher PowellAug 21, 2025
What to do if my Mitsubishi Electric PUMY-P125YKM3 Air Conditioner has high pressure trouble?
- A
  Andrea SandersAug 21, 2025
  If your Mitsubishi Electric Air Conditioner is experiencing high pressure issues, several factors could be responsible. First, ensure the stop valve is fully open (liquid/gas). Check for and clear any blockages in the pipes. Inspect the outdoor fan motor for malfunctions or if it's locked, and replace it if necessary. Address any short-cycling issues with the outdoor unit. Clean the outdoor heat exchanger. Check for noise interference affecting the remote controller's transmission. Reconnect the connector on the outdoor multi controller circuit board. If these steps don't resolve the issue, consider replacing the outdoor multi controller circuit board due to a potential malfunction of the input circuit.
D
David DavisAug 25, 2025
Why my Mitsubishi Electric PUMY-P125YKM3 Air Conditioner has refrigerant shortage?
- J
  Jonathan RobertsonAug 25, 2025
  A refrigerant shortage in your Mitsubishi Electric Air Conditioner can stem from several causes. Ensure the stop valve (ball valve) is fully open. A defective thermistor could also be the culprit, so consider replacing it. Look for gas leaks and repair any you find. If the 63HS component is defective, replace it. In some cases, the issue may arise from a defective outdoor multi controller circuit board, which would necessitate replacement. Finally, indoor LEV performance failure can also lead to refrigerant shortage, requiring replacement of the indoor LEV. Repair the refrigerant leak.
P
Patricia ShieldsAug 27, 2025
How to fix compressor temperature trouble in Mitsubishi Electric PUMY-P125YKM3 Air Conditioner?
- S
  Sean DixonAug 27, 2025
  To address compressor temperature issues in your Mitsubishi Electric Air Conditioner, begin by ensuring the stop valve (liquid/gas) is fully open. If the compressor is overheating due to a refrigerant shortage, repair the refrigerant leakage. A defective thermistor can also cause this problem, so replace it if necessary. Other potential causes include a defective outdoor multi controller circuit board (replace it), LEV performance failure (replace the indoor LEV), a defective indoor controller board (replace it), or a clogged refrigerant system (clean it). Also check for refrigerant shortage and repair the refrigerant leakage.
J
Jacqueline CooperAug 30, 2025
How to troubleshoot serial communication error on Mitsubishi Electric PUMY-P125YKM3 Air Conditioner?
- C
  Charles BakerAug 30, 2025
  To troubleshoot a serial communication error in your Mitsubishi Electric Air Conditioner, start by checking the CN2 and CN4 connectors for wire breakage or contact failure; connect them properly, and replace them if broken. If the issue persists, the communication circuit of either the outdoor multi controller circuit board or the power circuit board may be defective. If you cannot identify the defective circuit, replace the outdoor multi controller circuit board first. If the problem continues, replace the outdoor power circuit board.
R
Robert GoodSep 3, 2025
What causes superheat due to low discharge temperature trouble in Mitsubishi Electric PUMY-P125YKM3 Air Conditioner?
- N
  newtonkimSep 3, 2025
  Superheat issues due to low discharge temperature in your Mitsubishi Electric Air Conditioner can be caused by a few things. Check for disconnection or loose connection of TH4 and ensure the wiring is properly connected. A defective holder of TH4 may also be the problem, requiring you to replace the TH4. Additionally, inspect for disconnection of the LEV coil or connector, and reconnect them if necessary. Finally, LEV performance failure can also cause this issue, so replace the LEV if needed.
E
Edwin VazquezSep 6, 2025
What to do for 4-way valve trouble in heating mode of Mitsubishi Electric PUMY-P125YKM3?
- C
  choidanielSep 6, 2025
  If you're experiencing 4-way valve trouble in heating mode with your Mitsubishi Electric Air Conditioner, there are several things to check. First, the 4-way valve itself might be failing, in which case you should replace it. Also, check for disconnection or failure of the 4-way valve coil; reconnect it if necessary. Finally, a malfunction of the input circuit on the outdoor multi controller circuit board could be the cause, requiring you to replace the outdoor multi controller circuit board.
J
Justin ShermanSep 10, 2025
Why is my Mitsubishi Electric PUMY-P125YKM3 showing indoor HEX freezing protection?
- T
  taylorgeorgeSep 10, 2025
  Indoor HEX freezing protection in your Mitsubishi Electric Air Conditioner can occur due to several reasons. Check for wrong piping connections between the indoor unit and the branch box, and ensure the piping and wiring are connected to the same port. Miswiring between the indoor unit and branch box can also cause this, so connect the wiring to the intended port properly. Lastly, a malfunction of the LEV in the branch box might be the issue, requiring you to replace the LEV coil.

Mitsubishi Electric PUMY-P125YKM3 Specifications

General

Brand	Mitsubishi Electric
Model	PUMY-P125YKM3
Category	Air Conditioner
Language	English

Summary

Safety Precautions

R410A Refrigerant Cautions

Essential safety guidelines for handling R410A refrigerant.

Salt Proof Model Precautions

Specific installation and maintenance advice for salt-proof models.

Refrigerant Piping Cautions and Tools

Outdoor Unit Specifications

Unit Specification Details

Technical data including capacity, power, and temperature ranges.

Model Specifications

Wiring Diagrams

PUMY-P Series Wiring Diagrams

Electrical wiring schematics for various PUMY-P models.

Refrigerant Systems

Refrigerant System Diagram

Schematic of the refrigerant circuit components.

Refrigerant System Diagram with Branch Box

Refrigerant circuit schematic for systems with branch boxes.

Troubleshooting Procedures

Test Run Check Points

Pre-test run checks and operational procedures.

Wired Remote Controller Test Run

Procedure for performing test runs with specific wired remote controllers.

Error Countermeasures During Test Run

Table of error codes and their corrective actions during test runs.

Remote Controller Diagnosis

Steps for diagnosing M-NET remote controller issues.

Remote Controller Trouble Symptoms

Components and Checks

Component Check Procedures

Guides for checking specific components like thermistors and valves.

High Pressure Sensor Check

Procedure for checking the high pressure sensor and its configuration.

Low Pressure Sensor Check

Procedure for checking the low pressure sensor and its configuration.

Electrical Wiring and Connections

Power Wiring Overview

Main Power Supply Wiring Diagrams

Schematics for main power supply connections.

Basic System External Wiring Diagrams

Refrigerant Piping Tasks

Refrigerant Piping System

Overview of refrigerant piping methods and components.

Additional Refrigerant Charge Calculation

Guidance on calculating and charging additional refrigerant.

Refrigerant Piping System with Branch Box

Piping specifications and calculations for branch box systems.

Disassembly Procedures

Service Panel and Top Panel Removal

Fan Motor Removal

Electrical Parts Box Removal

Suction Pipe Thermistor (TH6) Removal

Ambient Thermistor (TH7) Removal

Liquid Pipe, Compressor, HIC Pipe Thermistor Removal

4-Way Valve Coil Removal

4-Way Valve Removal

Bypass Valve Coil and Valve Removal

High Pressure Switch/Sensor Removal

Low Pressure Sensor Removal

Electronic Expansion Valve Removal

Compressor Removal

Detailed steps for removing the compressor.

Accumulator Removal

Related product manuals

Preview: CITY MULTI PUMY-P125YMA

CITY MULTI PUMY-P125YMA

Mitsubishi Electric PUMY-P125VMA

Preview: PUMY-P125VHMB

Preview: Mr.SLIM PUMY-P125VKM

Mr.SLIM PUMY-P125VKM

Preview: CITY MULTI PUMY-P125

CITY MULTI PUMY-P125

Preview: Mitsubishi Electric PUMY-P100VHM

Mitsubishi Electric PUMY-P100VHM

Preview: PUMY-P100VHMB

Preview: PUMY-P112VKM1

PUMY-P140YKM1-BS