Midea MTI-48HWFN1-M User Manual

Revision O: 2103, Content updated.
Model Numbers:
Indoor Unit:
MCA3U-09HRFN1-M(C); MCA3U-12HRFN1-M(C); MCA3U-18HRFN1-M(C);
MFAU-12HRFN1-M(C); MCD-24HRFN1-M(C); MCD-36HRFN1-M(C);
MCD-48HRFN1-M(D); MUEU-18HRFN1-M(C); MUEU-24HRFN1-M(C); MUE-36HRFN1-M(C);
MUE-48HRFN1-M(C); MUE-60HRFN1-MW; MTIU-09HWFN1-M, MTIU-12HWFN1-M;
MTIU-18HWFN1-M; MTIU-24HWFN1-M; MTI-36HWFN1-M; MTI-48HWFN1-M;
MHG-60HWFN1-MW; MCD1-24HRFN1-MT0W(GA)
Outdoor Unit:
MOB30-09HFN1-MX0W; MOB01-09HFN1-MW0W; MOB30-12HFN1-MV0W;
MOB01-12HFN1-MV0W; MOCA30-18HFN1-MT0W; MOCA01-18HFN1-MT0W;
MOD30-24HFN1-MT0W; MOD01-23HFN1-MT0W; MOBA30-09HFN1-MT0W;
MOB30-12HFN1-MT0W; MOCA31-18HFN1-MT0W; MOD31-24HFN1-MT0W;
MOD30U-36HFN1-M; MOE30U-48HFN1-M; MOE30U-60HFN1-M; MOE30U-36HFN1-M-[X]
MOE30U-48HFN1-M-[X]; MOD30U-36HFN1-MP0; MOE30U-48HFN1-MP0
MOX230-09HFN1-MW5W; MOX330-09HFN1-MY5W; MOX230-12HFN1-MV5W;
MOX330-12HFN1-MW5W, MOX430-17HFN1-MT0W, MOD30-24HFN1-MU0W,
MOD33-24HFN1-MT0W
Light commercial MONO 3D Air
Conditioner
SERVICE MANUAL Mono DC
Table of Contents
1. Precaution
2. Part Names And Functions
3. Dimension
4. Service space
5. Refrigerant Cycle Diagram
6. Wiring Diagram
7. Fan Curves
8. Air Velocity Distributions
9. Electric Characteristics
10. Sound Level
11. Accessories
12. The Specification of Power
13. Field Wiring
14. Installation Details
15. Operation Characteristics
16. Electronic Function
17. Troubleshooting
18. Disassembly Instructions
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.
 This service is only for service engineer to use.

Midea MTI-48HWFN1-M Specifications

General

Brand	Midea
Model	MTI-48HWFN1-M
Category	Air Conditioner
Language	English

Summary

1. Precaution

1.1 Safety Precaution

Instructions to prevent injury to users, people, and property.

1.2 Warning

4. Service Space

5. Refrigerant Cycle Diagram

6. Wiring Diagram

6.1 Indoor Unit

Wiring diagrams for various indoor unit models and main circuit boards.

6.2 Outdoor Unit

Wiring diagrams for different outdoor unit models and main PCBs.

12. The Specification of Power

13. Field Wiring

14. Installation Details

14.1 Location selection

14.2 Indoor unit installation

Step-by-step installation for indoor units: service space and hanging methods.

14.3 Outdoor unit installation

Covers outdoor unit installation: service space and bolt pitch.

14.4 Refrigerant pipe installation

14.4.2 The procedure of connecting pipes

Details steps for connecting refrigerant pipes: cutting, flaring, torque.

14.4.3 First-Time Installation

Covers crucial steps: air purging, vacuum drying, refrigerant charging.

14.5 Drainage pipe installation

14.5.3 Drainage test

14.6 Vacuum Drying and Leakage Checking

14.6.1 Purpose of vacuum drying

Explains why vacuum drying is essential to prevent ice-blockage and compressor damage.

14.6.3 Operation procedure for vacuum drying

Details ordinary and special vacuum drying procedures.

14.7 Additional refrigerant charge

Calculates and performs additional refrigerant charge based on pipe size and length.

14.9 Engineering of electrical wiring

1 Highlights of electrical wiring installation

Essential guidelines for safe and compliant electrical wiring practices.

14.10 Test operation

16. Electronic Function

16.3 Main Protection

Details compressor protection: delay, temperature, overload, and fan speed.

16.4 Operation Modes and Functions

16.4.3.3 Defrosting mode

17. Troubleshooting

17.1 Indoor Unit Error Display

Lists error codes and LED status for indoor unit malfunctions.

17.2 Error Display on Two Way Communication Wired Controller

Lists error codes on wired controller for various malfunctions.

17.4 Diagnosis and Solution

Specific troubleshooting steps for common error codes and malfunctions.