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Midea M2OC-18HRDN1-M - User Manual

Midea M2OC-18HRDN1-M
39 pages
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ODMI-A-1110
SERVICE MANUAL
MIDEA AIRCONDITIONER
North America MARKET
DC INVERTER MULTI TYPE
M2OC-18HRDN1-M
M3OC-27HRDN1-M
M4OC-36HRDN1-M
DC MULTI OUTDOOR UNITS

Questions and Answers

  • U
    udavisAug 1, 2025
    How to fix open or short circuit of outdoor temperature sensor on Midea Air Conditioner?
    • G
      Gary RosarioAug 1, 2025
      If your Midea Air Conditioner displays 'Open or short circuit of outdoor temperature sensor', test or replace the outdoor temperature sensor.
  • M
    Maria JohnsonAug 6, 2025
    How to fix open or short circuit of room or evaporator coil temperature sensor on Midea Air Conditioner?
    • J
      Joseph BenjaminAug 6, 2025
      If your Midea Air Conditioner displays 'Open or short circuit of room or evaporator coil temperature sensor', test or replace the room or evaporator coil temperature sensor.
  • K
    kmillerAug 10, 2025
    What to do if Midea M2OC-18HRDN1-M Air Conditioner says No 1 Indoor unit pipe temp sensor is defective?
    • K
      Kerry HansenAug 10, 2025
      If your Midea Air Conditioner displays 'No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective', test or replace the pipe temperature sensor or its connector.
  • A
    Amanda HamptonAug 15, 2025
    What to do if Midea M2OC-18HRDN1-M says No 2 Indoor unit pipe temp sensor is defective?
    • N
      Nicole NobleAug 15, 2025
      If your Midea Air Conditioner displays 'No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective', test or replace the pipe temperature sensor or its connector.
  • S
    sarasnowAug 20, 2025
    What to do if Midea M2OC-18HRDN1-M Air Conditioner says No 3 Indoor unit pipe temp sensor is defective?
    • W
      wellsdavidAug 20, 2025
      If your Midea Air Conditioner displays 'No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective', test or replace the pipe temperature sensor or its connector.
  • M
    Mr. Howard ThomasAug 26, 2025
    What to do if Midea Air Conditioner says No 4 Indoor unit pipe temp sensor is defective?
    • J
      Julie OwenAug 26, 2025
      If your Midea Air Conditioner displays 'No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective', test or replace the pipe temperature sensor or its connector.

Summary

General Information of Outdoor Units

Features

Dimensions

Wiring Diagram

4.1 M2 OC-18 HRDN1-M

Wiring diagram for M2OC-18HRDN1-M outdoor unit.

4.2 M3 OC-27 HRDN1-M

Wiring diagram for M3OC-27HRDN1-M outdoor unit.

4.3 M4 OC-36 HRDN1-M

Wiring diagram for M4OC-36HRDN1-M outdoor unit.

Refrigeration Cycle Diagram

5.1 Refrigeration circuit drawing of inverter dual zone

Refrigeration circuit for dual zone inverter systems.

5.2 Refrigeration circuit drawing of inverter tri-zone

Refrigeration circuit for tri-zone inverter systems.

5.3 Refrigeration circuit drawing of inverter qua-zone

Refrigeration circuit for quad-zone inverter systems.

Indoor units combination

6.1 Indoor unit combination for M2 OC-18 HRDN1-M

Indoor unit combinations for M2OC-18HRDN1-M model.

6.2 Indoor unit combination for M3 OC-27 HRDN1-M

Indoor unit combinations for M3OC-27HRDN1-M model.

6.3 Indoor unit combination for M4 OC-36 HRDN1-M

Indoor unit combinations for M4OC-36HRDN1-M model.

Installation Details

7.1 Wrench torque sheet for installation

Torque specifications for installation fasteners.

7.2 Connecting the cables

Guidelines for selecting and connecting power and communication cables.

7.3 Pipe length and the elevation

Specifications for pipe length, elevation, and refrigerant charge.

7.4 Installation for the first time

Procedures for initial system installation and evacuation.

7.5 Adding the refrigerant after running the system for many years

Procedure for adding refrigerant to older systems.

7.6 Re-installation while the indoor unit need to be repaired

Steps for refrigerant collection before indoor unit repair.

7.7 Re-installation while the outdoor unit need to be repaired

Steps for system evacuation during outdoor unit repair.

Electronic control function

8.1 Abbreviation

List of abbreviations for temperature and sensor readings.

8.2 Electric control working environment.

Specifications for input voltage, frequency, and operating currents.

8.3 Outdoor units digital display tube

Explanation of the outdoor unit's digital display functions.

8.4 Outdoor unit point check function

Procedure for checking unit states via a switch and display.

8.5 Protection

Details on various protection mechanisms for the unit.

Troubleshooting

9.1 Indoor unit error code explanation:

Explains error codes displayed on indoor units.

9.2 Outdoor unit error code explanation:

Explains error codes displayed on outdoor units.

9.3 Trouble shooting

General guidance for troubleshooting issues.

9.3.2 Outdoor unit trouble shooting

Specific troubleshooting steps for outdoor unit issues.

Annex 1

Characteristic of temp. sensor

Table of temperature sensor resistance values at different temperatures.

Annex 2

Reference voltage data:

Lists reference voltage data for rectifier and inverter modules.

Midea M2OC-18HRDN1-M Specifications

General IconGeneral
BrandMidea
ModelM2OC-18HRDN1-M
CategoryAir Conditioner
LanguageEnglish

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