Midea M2OF-18HFN1-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 M2OF-18HFN1-M Specifications

General

Cooling energy efficiency class	A++
Heating energy efficiency class	A+
Type	Split System
Cooling Capacity	18000 BTU
Heating Capacity	19000 BTU
Power Supply	220-240V, 50Hz

Summary

Indoor Unit Combination

Dimension Of Outdoor Unit

Refrigerant Cycle Diagram

Refrigeration circuit of inverter 1 drive 2 type

Illustrates the refrigerant flow for a 1-drive-2 indoor unit system configuration.

Refrigeration circuit of inverter 1 drive 3 type

Details the refrigerant path for a 1-drive-3 indoor unit system setup.

Refrigeration circuit of inverter 1 drive 4 type

Diagram showing refrigerant circulation for a 1-drive-4 indoor unit system.

Refrigeration circuit of inverter 1 drive 5 type

Explains the refrigerant flow for a 1-drive-5 indoor unit system configuration.

Installation Details

Wrench Torque Specifications

Provides torque values for pipe connections to ensure secure and leak-free installation.

Power Cord and Connection Cable Specifications

Details the required specifications for power and connection wiring.

Piping Length and Elevation Limits

Specifies maximum allowable pipe lengths and height differences for optimal performance.

Refrigerant Charge Guidelines

Outlines procedures for additional refrigerant based on pipe length.

Electronic Function

Abbreviation of Sensor and Component Codes

Defines technical abbreviations for sensors and components used in the system.

Electric Control Working Environment

Specifies voltage and frequency requirements for the electronic control system.

Main Protection Features

Details various protection mechanisms to prevent damage and ensure safe operation.

Control and Functions Overview

Explains operational logic, capacity requests, and system controls.

Wiring Diagrams

Wiring Diagram for 1 Drive 2 Outdoor Unit (M2OF-18HFN1-M)

Provides the electrical schematic for the 1 drive 2 outdoor unit configuration.

Wiring Diagram for 1 Drive 3 Outdoor Unit (M3OF-27HFN1-M)

Illustrates the electrical connections for the 1 drive 3 outdoor unit.

Wiring Diagram for 1 Drive 4 Outdoor Unit (M4OF-36HFN1-M)

Shows the electrical layout for the 1 drive 4 outdoor unit model.

Wiring Diagram for M5OF-48HFN1-M

Details the electrical connections for the M5OF-48HFN1-M outdoor unit.

Troubleshooting

Safety Precautions During Troubleshooting

Highlights essential safety measures to follow when troubleshooting electrical components.

Indoor Unit Error Display Codes

Lists and explains error codes displayed by indoor units for fault identification.

Outdoor Unit Display and Error Codes

Details codes shown on the outdoor unit display for troubleshooting.

Diagnosis and Solution Guides

Provides step-by-step guidance for diagnosing and resolving common malfunctions.

Disassembly Instructions

Disassembly for M2OF-18HFN1-M (WCA30 metal plate)

Step-by-step guide for disassembling the M2OF-18HFN1-M outdoor unit.

Disassembly for M3OF-27HFN1-M (WD30 metal plate)

Instructions for taking apart the M3OF-27HFN1-M outdoor unit.

Disassembly for M4OF-36HFN1-M (WD30 metal plate)

Procedures for disassembling the M4OF-36HFN1-M outdoor unit.

Disassembly for M5OF-48HFN1-M (WE30 metal plate)

Guide on how to disassemble the M5OF-48HFN1-M outdoor unit.