Midea M4OC-36HRFN1-M User Manual

Multi outdoor units
SERVICE MANUAL
Multi zone
CONDENSING UNITS
Revision B: ODMI-C1-1403
Model Numbers:
M2OC-18HFN1-M M3OC-30HRFN1-M
M2OD-18HFN1-M M4OC-36HRFN1-M
M3OD-27HRDN1-M
WARNING
 Installation MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
 The information contained in the manual is intended for use by a qualified service
technician familiar with safety procedures and equipped with the proper tools and
test instruments
 Installation or repairs made by unqualified persons can result in hazards to you
and others.
 Failure to carefully read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or death.
Table of Contents
1. Product Specifications
2. Indoor Unit Combination
3. Suggested Indoor Unit Model Numbers
4. Dimension Of Outdoor Unit
5. Refrigerant Cycle Diagram
6. Installation Details
7. Electronic Function
8. Wiring Diagrams And Electrical Trouble Shooting
9. Disassembly Instructions
10. Exploded View

Midea M4OC-36HRFN1-M Specifications

General

Brand	Midea
Model	M4OC-36HRFN1-M
Category	Air Conditioner
Language	English

Summary

CONDENSING UNITS

Warnings

Crucial safety warnings regarding installation and manual usage.

Installation Details

First-Time Installation Procedures

Steps for initial system installation and preparation.

Electronic Function

Main Protection Functions

Details critical protection mechanisms for compressor and system safety.

Wiring Diagrams

1 Drive 2 Outdoor Unit Wiring

1 Drive 3 Outdoor Unit Wiring

1 Drive 4 Outdoor Unit Wiring

Troubleshooting

Safety Precautions

Essential safety guidelines before performing troubleshooting.

Indoor Unit Error Display

Codes and descriptions for indoor unit malfunctions.

Outdoor Unit Display

Information on outdoor unit display codes and self-check functions.

Diagnosis and Solution

Indoor Unit Troubleshooting

Diagnostic steps and solutions for indoor unit issues.

Temperature Sensor Fault Diagnosis

IPM Module / IGBT Over-Current Protection Diagnosis

Diagnosing and resolving IPM module or IGBT over-current protection faults.

Over/Under Voltage Protection Diagnosis

Troubleshooting voltage protection errors in the outdoor unit.

Compressor Top Temperature Protection Diagnosis

Inverter Compressor Drive Error Diagnosis

Outdoor Unit Troubleshooting

EEPROM Malfunction (E0) Diagnosis

Diagnosing and resolving outdoor unit EEPROM malfunctions.

Communication Malfunction (E2) Diagnosis

Troubleshooting communication errors between indoor and outdoor units.

IPM/Main Board Communication Error (E3) Diagnosis

Diagnosing communication issues between IPM and outdoor main board.

Temperature Sensor Errors (E4/F1-F5) Diagnosis

Voltage Protection (E5) Diagnosis

Diagnosing and resolving voltage protection errors.

PFC Module Protection (E6) Diagnosis

Troubleshooting PFC module protection errors.

Outdoor Fan Speed Control Issues Diagnosis

Compressor Top Temperature Protection (P0) Diagnosis

High Pressure Protection (P1) Diagnosis

Diagnosing and resolving high pressure protection faults.

Low Pressure Protection (P2) Diagnosis

Troubleshooting low pressure protection faults.

Compressor Current Protection (P3) Diagnosis

Compressor Discharge Temperature Protection (P4) Diagnosis

Condenser High Temperature Protection (P5) Diagnosis

IPM Module Protection (P6) Diagnosis

Trouble Criterion Of Main Parts

Temperature Sensor Checking

Compressor Check

Disassembly Instructions

M2OC/M2OD-18HFN1-M Disassembly

M3OD-27HRDN1-M Disassembly

M3OC-30HRFN1-M Disassembly

M4OC-36HRFN1-M Disassembly