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Midea M4OC-27HRDN1 User Manual

Midea M4OC-27HRDN1
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ODMI-A-1202
GD Midea Refrigeration Equipment Co.,Ltd
MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS
Technical service manual
R410A Multi DC inverter
220~240V-1Ph-50Hz
Outdoor units Models
M2OC-14HRDN1
M2OC-14HRDN1-Q
M2OC-18HRDN1
M2OC1-18HRDN1-Q
M3OC1-21HRDN1-Q
M3OC-27HRDN1
M3OC1-27HRDN1-Q
M4OC-24HRDN1-Q
M4OC1-27HRDN1-Q
M4OC-27HRDN1
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q
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Midea M4OC-27HRDN1 Specifications

General IconGeneral
Power Supply220-240V, 50Hz
RefrigerantR410A
Energy Efficiency Ratio (EER)3.21
Coefficient of Performance (COP)3.61
Operating Temperature (Cooling)18-43°C
Cooling Capacity27000 BTU
Heating Capacity28000 BTU
Operating Temperature (Heating)-7°C to 24°C

Summary

1. General Information of Outdoor Units

2. Features

Power Relay Control

Controls the power supply to various components.

Low Noise Air Flow System

Designed for reduced operational noise.

Hydrophilic Aluminum Fin

Enhances heating efficiency through surface treatment.

4-Way Valve Control

Manages refrigerant flow for heating/defrosting operations.

Anti-Rust Cabinet

Protects the unit's exterior from corrosion.

Valve Protection Cover

Safeguards valves and prevents water dripping.

Discharge Pipe Temperature Protection

Monitors and protects against high discharge temperatures.

Compressor Crankcase Heater

Prevents refrigerant dilution in the compressor crankcase.

3. Dimensions

4. Wiring Diagram

M2OC-14HRDN1-Q Wiring Diagram

Electrical schematic for the M2OC-14HRDN1-Q model.

M2OC-14HRDN1 Wiring Diagram

Electrical schematic for the M2OC-14HRDN1 model.

M2OC1-18HRDN1-Q Wiring Diagram

Electrical schematic for the M2OC1-18HRDN1-Q model.

M3OC Series Wiring Diagrams

Electrical schematics for M3OC1-21HRDN1-Q, M3OC1-27HRDN1-Q, M3OC-27HRDN1.

M2OC-18HRDN1 Wiring Diagram

Electrical schematic for the M2OC-18HRDN1 model.

M4OC-24HRDN1-Q Wiring Diagram

Electrical schematic for the M4OC-24HRDN1-Q model.

M4OC Series Wiring Diagrams

Electrical schematics for M4OC1-27HRDN1-Q and M4OC-27HRDN1.

M4OC-36HRDN1-Q Wiring Diagram

Electrical schematic for the M4OC-36HRDN1-Q model.

M50A-36HRDN1-Q Wiring Diagram

Electrical schematic for the M50A-36HRDN1-Q model.

5. Refrigeration Cycle Diagram

Inverter Binary Refrigeration Circuit

Diagram showing the refrigerant flow for binary type systems.

Inverter Trinary Refrigeration Circuit

Diagram showing the refrigerant flow for trinary type systems.

Inverter Quadplex Refrigeration Circuit

Diagram showing the refrigerant flow for quadplex type systems.

Inverter Quintuple Refrigeration Circuit

Diagram showing the refrigerant flow for quintuple type systems.

6. Indoor Units Combination

M2OC-14HRDN1-Q/M2OC-14HRDN1 Combination

Indoor unit combinations for specific M2OC models.

M2OC1-18HRDN1-Q/M2OC-18HRDN1 Combination

Indoor unit combinations for specific M2OC models.

M3OC1-21HRDN1-Q Combination

Indoor unit combinations for the M3OC1-21HRDN1-Q model.

M3OC Series Combination

Indoor unit combinations for M3OC1-27HRDN1-Q and M3OC-27HRDN1.

M4OC-24HRDN1-Q Combination

Indoor unit combinations for the M4OC-24HRDN1-Q model.

M4OC Series Combination

Indoor unit combinations for M4OC1-27HRDN1-Q and M4OC-27HRDN1.

M4OC-36HRDN1-Q Combination

Indoor unit combinations for the M4OC-36HRDN1-Q model.

M5OA-36HRDN1-Q Combination

Indoor unit combinations for the M5OA-36HRDN1-Q model.

7. Electronic Control Function

Abbreviation of Control Terms

Defines common abbreviations used in electronic controls.

Electric Control Working Environment

Specifies operating conditions for electronic controls.

Outdoor Unit Digital Display Tube Function

Details the functions and displays of the outdoor unit's LED.

Outdoor Unit Point Check Function

Procedure for checking unit states using the SW1 switch.

Point Check Displays (Standard Units)

Displays and remarks for point check function on most units.

Point Check Displays (M5OA-36HRDN1-Q)

Specific displays and remarks for M5OA-36HRDN1-Q point check.

Compressor Frequency and Running Mode

Details on compressor frequency and unit running modes.

Capacity Demand and Ambient Temperature

Information on capacity demand and ambient temperature readings.

Capacity Demand Codes

Codes corresponding to cooling and heating capacity demands.

Indoor Unit Count and Ambient Temperature

Data on indoor unit count and outdoor ambient temperature.

Electronic Expansion Valve Opening Degree

Details on the opening degree of electronic expansion valves.

7.5 Protection

Compressor Restart Delay

Ensures a delay before compressor restarts to prevent damage.

Compressor Discharge Temperature Protection

Protects the compressor from overheating at the discharge.

Under Voltage Protection

Safeguards components against low voltage conditions.

Compressor Current Limit Protection

Limits compressor frequency based on current to prevent overcurrent.

Indoor/Outdoor Communication Protection

Handles communication failures between indoor and outdoor units.

High Condenser Coil Temperature Protection

Shuts down the compressor if condenser coil temperature is too high.

Outdoor Unit Anti-Freezing Protection

Prevents freezing of the outdoor unit's heat exchanger.

Oil Return Rules

Defines rules for ensuring proper oil circulation.

Compressor Preheating Functions

Functions to preheat the compressor under specific cold conditions.

Compressor Crankcase Heater

Heats the compressor crankcase to prevent oil dilution in cold weather.

8. Troubleshooting

Indoor Unit Error Code Explanation

Lists and explains error codes for indoor unit malfunctions.

Glory Series Indoor Unit Error Codes

Error codes and LED status for Glory series indoor units.

9V, VERTU, 9A, Corona, R, Y, X Series Indoor Unit Error Codes

Error codes for various indoor unit series.

NEOLA, PREMIER, OASIS Series Indoor Unit Error Codes

Error codes for NEOLA, PREMIER, OASIS series indoor units.

A5 Duct Series Indoor Unit Error Codes

Error codes and LED status for A5 Duct series indoor units.

Console Series Indoor Unit Error Codes

Error codes and LED status for Console series indoor units.

Outdoor Unit Error Code Explanation (Standard Models)

Error codes for outdoor units excluding the M5OA-36HRDN1-Q model.

Outdoor Unit Error Code Explanation (M5OA-36HRDN1-Q)

Error codes specific to the M5OA-36HRDN1-Q outdoor unit.

Troubleshooting Indoor EEPROM Malfunction

Steps to diagnose and resolve indoor EEPROM malfunction.

Troubleshooting Indoor/Outdoor Communication Error

Steps to diagnose and resolve indoor/outdoor unit communication errors.

Troubleshooting Zero-Crossing Signal Error

Steps to diagnose and resolve zero-crossing signal errors.

Troubleshooting Indoor Fan Speed Control

Steps to diagnose and resolve indoor fan speed control issues.

Troubleshooting Temperature Sensor Malfunction

Steps to diagnose and resolve temperature sensor open/short circuits.

Troubleshooting Full-Water Malfunction

Steps to diagnose and resolve full-water malfunction issues.

Troubleshooting Outdoor EEPROM Malfunction

Steps to diagnose and resolve outdoor EEPROM malfunction.

Troubleshooting Compressor Voltage Protection

Steps to diagnose and resolve compressor voltage protection issues.

Troubleshooting IPM Board Communication Malfunction

Steps to resolve communication issues between IPM and outdoor boards.

Troubleshooting Compressor Discharge Temperature Protection

Steps to diagnose and resolve compressor discharge temperature protection.

Troubleshooting Compressor Top Temperature Protection

Steps to diagnose and resolve compressor top temperature protection.

Troubleshooting High Pressure Protection

Steps to diagnose and resolve high pressure protection faults.

Troubleshooting Low Pressure Protection

Steps to diagnose and resolve low pressure protection faults.

Troubleshooting Compressor Current Protection

Steps to diagnose and resolve compressor current protection faults.

Troubleshooting IPM Module Protection

Steps to diagnose and resolve IPM module protection faults.

Troubleshooting High Condenser Temperature Protection

Steps to diagnose and resolve high condenser temperature protection.

Troubleshooting PFC Module Protection

Steps to diagnose and resolve PFC module protection faults.

Troubleshooting Inverter Compressor Drive Protection

Steps to diagnose and resolve inverter compressor drive protection faults.

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