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Mitsubishi Electric PUHY-(E)P300 - User Manual

Mitsubishi Electric PUHY-(E)P300
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Service Handbook
AIR CONDITIONERS
Models
PUHY-(E)P200, P250, (E)P300, P350, (E)P400, (E)P450YHM-A
PUHY-(E)P500, (E)P550, (E)P600, (E)P650YSHM-A
PUHY-(E)P700, (E)P750, (E)P800, (E)P850, (E)P900YSHM-A
PUHY-P950, P1000, P1050, P1100, P1150, P1200, P1250YSHM-A

Table of Contents

Questions and Answers

  • E
    edgar17Aug 20, 2025
    How to fix water leakage from Mitsubishi Electric PUHY-(E)P300?
    • D
      Dennis JohnstonAug 20, 2025
      If you notice water leaking from your Mitsubishi Electric Air Conditioner, inspect the drainage lines for any clogs. Also, ensure that the unit was properly installed.
  • C
    cclarkAug 22, 2025
    What to do if Mitsubishi Electric Air Conditioner discharge air temperature is abnormal?
    • P
      Paula HobbsAug 22, 2025
      If you observe an abnormal discharge air temperature in your Mitsubishi Electric Air Conditioner, inspect the refrigerant levels and ensure that the compressor is functioning properly.
  • M
    Madison BurnsAug 25, 2025
    How to troubleshoot abnormal high pressure in Mitsubishi Electric Air Conditioner?
    • J
      Joseph GuerreroAug 25, 2025
      If you notice abnormal high pressure in your Mitsubishi Electric Air Conditioner, check the system for blockages and ensure proper airflow.
  • S
    scotthectorAug 26, 2025
    What causes abnormal low pressure in Mitsubishi Electric PUHY-(E)P300 Air Conditioner?
    • D
      deborahewingAug 27, 2025
      If you observe abnormal low pressure in your Mitsubishi Electric Air Conditioner, verify the refrigerant charge and check for any leaks.
  • C
    Christina MarshallAug 28, 2025
    How to fix heatsink overheat protection on Mitsubishi Electric PUHY-(E)P300?
    • T
      twallAug 28, 2025
      If the heatsink on your Mitsubishi Electric Air Conditioner is overheating, check the airflow around the heatsink and clean any dust build-up.
  • D
    davidkaufmanAug 29, 2025
    How to fix temperature sensor failure in Mitsubishi Electric PUHY-(E)P300?
    • J
      jason35Aug 30, 2025
      If the temperature sensor fails in your Mitsubishi Electric Air Conditioner, replace the malfunctioning temperature sensor.
  • H
    harrisveronicaAug 31, 2025
    What to do if drain pump fails in Mitsubishi Electric PUHY-(E)P300?
    • C
      Cassandra CordovaSep 1, 2025
      If the drain pump fails in your Mitsubishi Electric Air Conditioner, check the drain pump for blockages and replace it if necessary.
  • D
    Dale StephensSep 2, 2025
    How to troubleshoot RPM error or motor malfunction in Mitsubishi Electric Air Conditioner?
    • N
      Nicholas LoweSep 2, 2025
      If you are experiencing an RPM error or motor malfunction with your Mitsubishi Electric Air Conditioner, inspect the motor and RPM sensors for faults.
  • J
    Jennifer HarrisSep 4, 2025
    What to do for drain pump failure or float switch trip in Mitsubishi Electric PUHY-(E)P300?
    • N
      Nathaniel Bond MDSep 4, 2025
      If the drain pump fails or the float switch trips on your Mitsubishi Electric Air Conditioner, reset the float switch and check the drainage system.
  • H
    hessdianaSep 6, 2025
    How to fix IPM error in Mitsubishi Electric PUHY-(E)P300?
    • B
      Benjamin StewartSep 6, 2025
      If you encounter an IPM error with your Mitsubishi Electric Air Conditioner, inspect the inverter for faults and replace it as necessary.

Summary

Safety Precautions

Installation and Electrical Safety

Emphasizes professional installation, proper grounding, and electrical safety measures to prevent hazards.

I Read Before Servicing

Read Before Servicing Procedures

General instructions and checks before servicing, including refrigerant type and safety.

Necessary Tools and Materials

Lists required tools and materials for R410A systems, categorizing their use.

Piping Materials Specifications

Details copper pipe types, thickness, and flare dimensions for R410A systems.

Vacuum Drying and Refrigerant Charging

Steps for vacuum drying and charging R410A refrigerant, emphasizing liquid state.

Refrigerant Leak Remedies

Procedures for replenishing refrigerant after a leak, referring to troubleshooting section.

II Restrictions

System Configuration Guidelines

Summarizes compatible indoor/outdoor unit combinations, capacities, and counts.

Pipe Length Restrictions

Specifies allowable lengths for refrigerant piping sections and height differences.

III Outdoor Unit Components

IV Remote Controller

V Electrical Wiring Diagram

Outdoor Unit Electrical Wiring Diagram

Detailed wiring diagrams for various outdoor unit models.

VI Refrigerant Circuit

VII Control

Dipswitch Functions and Factory Settings

Details DIP switch functions on control and INV boards for various settings.

VIII Test Run Mode

Pre-Test Run Checks

Essential checks before test runs: safety, connections, power, and insulation.

Refrigerant Adjustment and Characteristics

Explains refrigerant effects on system operation and adjustment principles.

Refrigerant Amount Adjust Mode

Detailed procedure for adjusting refrigerant levels using sensor readings and modes.

IX Troubleshooting

Error Code Lists

Comprehensive list of error codes, definitions, and affected units.

Refrigerant Leak Detection and Repair

Procedures for finding and fixing refrigerant leaks in indoor/outdoor units.

Mitsubishi Electric PUHY-(E)P300 Specifications

General IconGeneral
ModelPUHY-(E)P300
SeriesCity Multi
TypeVRF Outdoor Unit
Cooling Capacity (kW)30.0
Heating Capacity (kW)33.5
RefrigerantR410A
Energy Efficiency ClassA
Power Supply380-415V, 50Hz
Operating Temperature (Cooling)-5°C to 46°C

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