Midea M3OF-27HFN1-M User Manual

1
Multi outdoor units
SERVICE MANUAL
Multi zone
CONDENSING UNITS
Revision E: ODMFI-E-1712
Model Numbers:
M2OF-18HFN1-M M3OF-27HFN1-M M4OF-36HFN1-M
M5OF-48HFN1-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. Indoor Unit Combination
2. Dimension Of Outdoor Unit
3. Refrigerant Cycle Diagram
4. Installation Details
5. Electronic Function
6. Wiring Diagrams
7. Trouble Shooting
8. Disassembly Instructions

Midea M3OF-27HFN1-M Specifications

General

Model Number	M3OF-27HFN1-M
Category	Heat Pump
Refrigerant	R410A
Weight (Outdoor Unit)	42 kg
Cooling Capacity	27000 BTU
HSPF	9.0
Power Supply	220-240V, 50Hz

Summary

Installation Details

Wrench torque sheet for installation

Connecting the cables

Details on power cord and connection line specifications for installation.

Pipe length and the elevation

First-Time Installation

Procedures and warnings for initial system installation and setup.

Electronic Function

Main Protection

Details on various protection mechanisms for the unit.

Control and Functions

Details on system control and operational functions.

Wiring Diagrams

Wiring diagram of 1 drive 2 outdoor

Wiring diagram for a 1 drive 2 outdoor unit.

Wiring diagram of 1 drive 3 outdoor

Wiring diagram of 1 drive 4 outdoor

Wiring diagram of M5OF-48HFN1-M

Troubleshooting

Safety

Safety precautions to be followed during troubleshooting.

Indoor Unit Error Display

Table of indoor unit error codes and their meanings.

Outdoor Unit Display

Information on outdoor unit digital displays and codes.

Diagnosis and Solution

Detailed troubleshooting steps for various malfunctions.

M2OF-18HFN1-M Disassembly

M3OF-27HFN1-M Disassembly

M4OF-36HFN1-M Disassembly

M5OF-48HFN1-M Disassembly

Compressor