Mitsubishi Electric PUMY-P112VKM3 User Manual (English)

Questions and Answers:

P
Patricia KnightJul 31, 2025
What to do if my Mitsubishi Electric PUMY-P112VKM3 Air Conditioner has high pressure trouble?
- S
  Sara SuttonJul 31, 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.
R
Regina BrownAug 4, 2025
Why my Mitsubishi Electric PUMY-P112VKM3 Air Conditioner has refrigerant shortage?
- A
  Alexis FrancoAug 4, 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.
D
David KellyAug 8, 2025
How to fix compressor temperature trouble in Mitsubishi Electric PUMY-P112VKM3 Air Conditioner?
- T
  Taylor MooneyAug 9, 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.
T
Theresa SmithAug 13, 2025
How to troubleshoot serial communication error on Mitsubishi Electric PUMY-P112VKM3 Air Conditioner?
- C
  Casey WilsonAug 13, 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.
A
Anna PaceAug 17, 2025
What causes superheat due to low discharge temperature trouble in Mitsubishi Electric PUMY-P112VKM3?
- T
  teresahaleAug 17, 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
edwardsphilipAug 21, 2025
What to do for 4-way valve trouble in heating mode of Mitsubishi Electric PUMY-P112VKM3 Air Conditioner?
- A
  April RhodesAug 21, 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.
C
Chelsea WatsonAug 26, 2025
Why is my Mitsubishi Electric PUMY-P112VKM3 showing indoor HEX freezing protection?
- W
  Walter MaldonadoAug 27, 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-P112VKM3 Specifications

General

Cooling Capacity (kW)	11.2
Heating Capacity (kW)	12.5
Refrigerant	R410A
Operating Temperature Range (Cooling)	-5 to 46°C
Type	Heat Pump

Summary

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for handling R410A refrigerant, piping, tools, and oil.

PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL

Guidelines for installing and maintaining salt-proof models in coastal areas.

OVERVIEW OF UNITS

UNIT CONSTRUCTION

Details on different types of indoor and outdoor units and their connections.

UNIT CONSTRUCTION (BRANCH BOX SYSTEM)

Information on connecting indoor units via branch boxes.

UNIT CONSTRUCTION (MIXED SYSTEM)

System configurations combining different types of indoor units.

UNIT SPECIFICATIONS

Technical specifications for various outdoor unit models.

SPECIFICATIONS

Outdoor Unit Specifications

Detailed technical data for outdoor units including capacity, power, and dimensions.

Refrigerant Piping Specifications

Details on refrigerant pipe sizes and specifications for various models.

Compressor and Electrical Specifications

Information on compressor type, motor output, and protection devices.

DATA

SELECTION OF COOLING/HEATING UNITS

Guides for calculating and selecting indoor/outdoor units for cooling and heating.

CORRECTING CAPACITY BY TEMPERATURE

Adjustments for cooling/heating capacity based on temperature variations.

STANDARD OPERATION DATA

Reference data for standard operating conditions and measurements.

STANDARD CAPACITY DIAGRAM

Graphical representation of capacity and input based on total indoor units.

OUTLINES AND DIMENSIONS

Outdoor Unit Dimensions and Installation Space

Detailed physical dimensions and required installation clearances for outdoor units.

WIRING DIAGRAM

WIRING DIAGRAMS FOR VARIOUS MODELS

Electrical wiring diagrams for PUMY-P VKM3, YKM3, and YKME3 series outdoor units.

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

TRANSMISSION SYSTEM SETUP

Guidelines for setting up the transmission system for remote controllers and indoor units.

TROUBLESHOOTING

CHECK POINTS FOR TEST RUN

Procedures and safety checks before performing a test run.

M-NET REMOTE CONTROLLER TEST RUN

Step-by-step guide for conducting a test run with an M-NET remote controller.

WIRED REMOTE CONTROLLER TEST RUN

Guide for performing a test run using PAR-31MAA/PAR-32MAA wired remote controllers.

COUNTERMEASURES FOR ERROR DURING TEST RUN

Troubleshooting guide for identifying and resolving errors during test runs.

ELECTRICAL WIRING

OVERVIEW OF POWER WIRING

General notes and precautions for power wiring.

WIRING OF MAIN POWER SUPPLY

Wiring diagrams for main power supply to outdoor units and branch boxes.

REFRIGERANT PIPING TASKS

REFRIGERANT PIPING SYSTEM

Guidelines for refrigerant piping design, selection, and installation.

REFRIGERANT PIPING SYSTEM (BRANCH BOX)

Specifics for refrigerant piping when using branch boxes.

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

Safety measures and calculations for preventing and managing refrigerant leaks.

DISASSEMBLY PROCEDURE

Removing Panels and Fan Motor

Steps to remove service panel, top panel, and fan motor assembly.

Removing Electrical Components

Instructions for removing electrical parts box, connectors, and sensors.

Removing Major Refrigeration Components

Procedure for removing 4-way valve, bypass valve, sensors, and expansion valves.

Removing Compressor and Accumulator

Steps for safely removing the compressor and accumulator.

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14 pages

Mitsubishi Electric PUMY-P112VKM3 User Manual

Table of Contents

Questions and Answers:

Mitsubishi Electric PUMY-P112VKM3 Specifications

Summary

SAFETY PRECAUTION

CAUTIONS RELATED TO NEW REFRIGERANT

PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL

OVERVIEW OF UNITS

UNIT CONSTRUCTION

UNIT CONSTRUCTION (BRANCH BOX SYSTEM)

UNIT CONSTRUCTION (MIXED SYSTEM)

UNIT SPECIFICATIONS

SPECIFICATIONS

Outdoor Unit Specifications

Refrigerant Piping Specifications

Compressor and Electrical Specifications

DATA

SELECTION OF COOLING/HEATING UNITS

CORRECTING CAPACITY BY TEMPERATURE

STANDARD OPERATION DATA

STANDARD CAPACITY DIAGRAM

OUTLINES AND DIMENSIONS

Outdoor Unit Dimensions and Installation Space

WIRING DIAGRAM

WIRING DIAGRAMS FOR VARIOUS MODELS

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

TRANSMISSION SYSTEM SETUP

TROUBLESHOOTING

CHECK POINTS FOR TEST RUN

M-NET REMOTE CONTROLLER TEST RUN

WIRED REMOTE CONTROLLER TEST RUN

COUNTERMEASURES FOR ERROR DURING TEST RUN

ELECTRICAL WIRING

OVERVIEW OF POWER WIRING

WIRING OF MAIN POWER SUPPLY

REFRIGERANT PIPING TASKS

REFRIGERANT PIPING SYSTEM

REFRIGERANT PIPING SYSTEM (BRANCH BOX)

PRECAUTIONS AGAINST REFRIGERANT LEAKAGE

DISASSEMBLY PROCEDURE

Removing Panels and Fan Motor

Removing Electrical Components

Removing Major Refrigeration Components

Removing Compressor and Accumulator

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