Midea MGA-D65W/SN1

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MCAC-2008-11 Air-cooled Modular Chiller

1

Contents

1. Nomenclature…………..………………………………………………...

2. Product Schedule………………………………………………………..

3. Features…………………………………………………………………...

4. Specification……………………………………………………………...

5. Dimension…………………………………………………………………

6. Piping Diagrams & Pipe Connection Drawing……………………...

7. Wiring Diagrams……………………….………………………………..

8. Electric Characteristics…………………………………………….......

9. Capacity Tables…………………………………………………………

10. Exploded View………………………………………………………….

11. Troubleshooting……………..…………………………………………

12. Installation……………………………..………………………………..

13. Debugging...…………………………..………………………………

14. Maintenance…..…………………………..……………………………

15. Control……………………………..…………………………………….

※ Manufacture reserves the right to discontinue, or change at any time, specifications or designs without

notices and without incurring obligations.

Table of Contents

Questions and Answers:

J
jeffrey52Aug 14, 2025
Why is the discharge pressure high on my Midea MGA-D65W/SN1 (cooling mode)?
- J
  Joyce WrightAug 14, 2025
  High discharge pressure in a Midea Chiller during cooling can occur if air or another gas enters the system. To resolve this, discharge the gas from the refrigerant charging hole and re-vacuum if necessary. It can also happen if the fins are dirty or blocked; in this case, splash the fins of the condenser. Finally, check the condenser motor and repair it if it's faulty, because insufficient condenser wind flow or motor failure can also cause high discharge pressure.
S
Spencer TaylorAug 17, 2025
How to fix abnormal noise from Midea MGA-D65W/SN1 compressor?
- J
  John JohnstonAug 17, 2025
  Abnormal noise from the compressor in your Midea Chiller can be caused by compressor liquid pumping due to liquid refrigerant entering. Adjust the refrigerant volume and inspect the expansion valve and suction gas degree of superheat to solve this.
J
John DawsonAug 21, 2025
What causes low suction pressure in Midea MGA-D65W/SN1 (cooling) and how to fix it?
- D
  diane64Aug 21, 2025
  Low suction pressure in a Midea Chiller (cooling mode) can be due to insufficient water flow. To address this, measure the temperature difference between the inlet and outlet water and adjust the water flow accordingly. It can also be caused by a refrigerant leak or insufficient refrigerant, in which case you should perform leak-hunting and recharge the system.
B
brandon77Aug 25, 2025
What causes high discharge pressure in Midea Chiller (heating mode)?
- C
  Charles TaylorAug 25, 2025
  High discharge pressure in a Midea Chiller during heating can occur if air or another gas enters the system. To fix this, discharge the gas from the refrigerant charging hole, re-vacuuming if needed. Also, scaling in the waterside heat exchanger can cause this issue, so descaling is required.
J
Jonathan StephensAug 27, 2025
Why is the suction pressure high on my Midea MGA-D65W/SN1 (cooling mode)?
- C
  Cheryl RamirezAug 27, 2025
  High suction pressure in a Midea Chiller (cooling mode) is often due to the system being overcharged with refrigerant. To resolve this, discharge the excess refrigerant.
A
angelaconleyAug 31, 2025
What to do if Midea MGA-D65W/SN1 Chiller compressor stops due to anti-freeze protection (Cooling)?
- S
  Sharon YorkAug 31, 2025
  If the compressor in your Midea Chiller stops due to anti-freeze protection during cooling, it could be due to insufficient chilled water. This can be caused by a failure of the water pump or water flow switch. Maintain or replace these components as necessary.
C
Christopher OwenSep 3, 2025
What causes low discharge pressure in Midea Chiller (cooling mode)?
- D
  Danielle HayesSep 3, 2025
  Low discharge pressure in a Midea Chiller during cooling may indicate a refrigerant leak or insufficient refrigerant. Conduct leak-hunting procedures and recharge the system as necessary.
J
Jasmine ParkSep 6, 2025
What causes low discharge pressure in Midea MGA-D65W/SN1 (heating mode)?
- K
  Kathryn MorganSep 6, 2025
  Low discharge pressure in a Midea Chiller during heating may be due to a refrigerant leak or insufficient refrigerant. You should perform leak-hunting and recharge the system.
C
Christopher CainSep 9, 2025
Why does the Midea MGA-D65W/SN1 Chiller compressor stop due to low-pressure protection?
- J
  James CurrySep 9, 2025
  If the compressor stops in your Midea Chiller due to low-pressure protection, it may be because the filter before or after the electric expansion valve is blocked. Replace the filter to resolve this issue.

Midea MGA-D65W/SN1 Specifications

General

Brand	Midea
Model	MGA-D65W/SN1
Category	Chiller
Language	English

Summary

Nomenclature

Specification

Piping Diagrams & Pipe Connection Drawing

Refrigeration System Sketch Drawing for 30 kW Module Unit

Refrigeration System Sketch Drawing for 65 kW

Water Pipe Sketch Drawing for 30 kW Module Unit System

Water Pipe Sketch Drawing for 65 kW Module Unit System

Wiring Diagrams

Outdoor Wiring Diagram for Main Unit (30 kW & 65 kW)

Details the outdoor wiring for main 30kW and 65kW modules.

Outdoor Wiring Diagram for Auxiliary Unit (30 kW & 65 kW)

Details the outdoor wiring for auxiliary 30kW and 65kW modules.

Electric Characteristics

Capacity Tables

Cooling Capacity Tables

Detailed cooling capacity tables for different operating conditions.

Heating Capacity Tables

Detailed heating capacity tables for different operating conditions.

Troubleshooting

Common Troubles and Solutions

Provides common troubles, their possible reasons, and recommended solutions.

Installation

Unit Installation Procedures

Details the overall process for installing the unit.

Transportation Guidelines

Required Installation Place

Installation Foundation Guidelines

Operation Limits

Defines voltage range and temperature limits for unit operation.

Water System Installation

Provides instructions for connecting the water system to the unit.

Wiring Installation Procedures

Covers precautions and procedures for electrical wiring installation.

Wiring Installation Precautions

Important safety and installation precautions related to electrical wiring.

Wiring Specification Details

Specifies wiring models, diameters, and categories for proper installation.

Control Wiring Specification

Grounding Wiring Diameter Selection

Power Wiring Specifications

Water Flow Switch Wiring Connection

Testing

Preparation for Testing

Steps to prepare the unit and water system before testing.

Testing Procedures

Procedures for conducting unit testing and verifying operation.

Maintenance

Main Component Maintenance

Instructions for maintaining key components like compressors and electrical parts.

Descaling Procedures

Procedures for descaling heat exchangers to maintain efficiency.

Refrigeration System Checks

Checks and procedures for the refrigeration system, including leakage tests.

System Anti-Freeze Measures

Precautions and procedures to prevent system freezing, especially in winter.

Control System

PCB Outline and Description

Explains the PCB layout and identifies key components of the control system.

PCB Outlook View (30 kW & 65 kW Module)

PCB Components Description (30 kW & 65 kW Module)

Module Failure & Protection Codes

A comprehensive list of module failure and protection codes.

Controllers

Wired Controller (KJR-08 BBE)

Details the wired controller model KJR-08B/BE and its functions.

LCD Screen Name and Function Description

Wired Controller Installation Procedure

Wired Controller Power Connection

Wired Controller Operation Procedure

Unit Information Querying

System Information Querying

Water Temperature Setting

Fault Alarm Handling

How the system handles and indicates faults or alarms.

CCM10 LCD Touch Screen (Optional)

Mechanical Installation of LCD Touch Screen

Electrical Installation of LCD Touch Screen

LCD Touch Screen Operation Description

LCD Operation Window Overview

Query Window Operation

LCD Setting Window Operation

Malfunction Query Window

How to view and query malfunction details and history.

Error History Window

Electricity Control Function Description

LCD Operation Description

Query Function Details

Mode Setting Function

Communication with Unit Group

Operation Mode and Control Mode Setting

Malfunction Alarm Disposal

How the system handles and displays malfunction alarms.

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