Midea MCH3U-27PHH2

1
MULTI OUTDOOR UNITS
SERVICE MANUAL
Multi zone
CONDENSING UNITS
Revision C: ODMI-E-1606
Model Numbers:
MCH2U-18PHH2 MCH3U-27PHH2 MCH4U-36PHH2
MCH5U-48PHH2
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. Suggested Indoor Unit Model Numbers
3. Dimension Of Outdoor Unit
4. Refrigerant Cycle Diagram
5. Installation Details
6. Electronic Function
7. Wiring Diagrams
8. Trouble Shooting
9. Disassembly Instructions

Midea MCH3U-27PHH2 Specifications

General

Refrigerant	R410A
Power Supply	220-240V, 50Hz
Cooling Capacity	27000 BTU
Operating Temperature (Cooling)	18°C to 43°C
Operating Temperature (Heating)	-7°C to 24°C

Summary

Unit Configuration and Outdoor Unit Dimensions

Indoor Unit Combinations

Details on combining indoor units with outdoor units for system compatibility.

Outdoor Unit Dimensions

Provides physical dimensions and key specifications for outdoor units.

Refrigerant Cycle, Installation, and Maintenance

Refrigerant Cycle Diagrams

Visual representation of refrigerant flow for different system types.

Installation Procedures

Guide for installing outdoor units, piping, and initial setup.

Refrigerant Handling and Servicing

Procedures for adding refrigerant and servicing refrigeration circuits.

Electronic Functions, Protections, and Wiring Diagrams

System Functions and Controls

Explains abbreviations, working environments, and control logic like fan and EXV.

Protection Mechanisms

Details various protection features including compressor, voltage, current, and ambient temperature.

Wiring Diagrams

Schematic diagrams for outdoor unit models and their electrical connections.

Troubleshooting, Error Codes, and Component Disassembly

Safety Precautions for Troubleshooting

Essential safety measures before performing troubleshooting procedures.

Indoor and Outdoor Unit Error Displays

Lists error codes and their meanings for unit malfunctions.

Diagnosis and Solution Flowcharts

Step-by-step guides for diagnosing and resolving common system malfunctions.

Component Disassembly Instructions

Step-by-step guides for disassembling major outdoor unit components across models.