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Midea MGA-D30W/SN1 - User Manual

Midea MGA-D30W/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

  • C
    Cassandra JordanAug 14, 2025
    Why is the discharge pressure high on my Midea MGA-D30W/SN1 Chiller (cooling mode)?
    • J
      Jeremy MoranAug 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.
  • T
    Todd BrownAug 17, 2025
    How to fix abnormal noise from Midea MGA-D30W/SN1 Chiller compressor?
    • B
      benjamin20Aug 18, 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.
  • D
    daniel69Aug 21, 2025
    What causes low suction pressure in Midea Chiller (cooling) and how to fix it?
    • M
      michelle96Aug 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.
  • L
    lmitchellAug 25, 2025
    What causes high discharge pressure in Midea Chiller (heating mode)?
    • M
      Michelle PalmerAug 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.
  • B
    Brenda ThompsonAug 27, 2025
    Why is the suction pressure high on my Midea MGA-D30W/SN1 (cooling mode)?
    • J
      juanenglishAug 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.
  • B
    Brandy JohnsonAug 30, 2025
    What to do if Midea Chiller compressor stops due to anti-freeze protection (Cooling)?
    • E
      Elizabeth HickmanAug 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.
  • S
    Sara PerezSep 3, 2025
    What causes low discharge pressure in Midea Chiller (cooling mode)?
    • C
      Catherine MossSep 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.
  • W
    William ThomasSep 6, 2025
    What causes low discharge pressure in Midea MGA-D30W/SN1 (heating mode)?
    • U
      uphillipsSep 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.
  • I
    Isaiah CamposSep 9, 2025
    Why does the Midea Chiller compressor stop due to low-pressure protection?
    • W
      wadejasonSep 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.

Summary

Capacity Tables

9.1 Cooling

Cooling capacity data for MGA-F30W/SN1 and MGA-D30W/SN1 models.

9.1 Cooling (Continued)

Cooling capacity data for MGA-F65W/SN1 and MGA-D65W/SN1 models.

9.2 Heating

Heating capacity data for MGA-F30W/SN1 and MGA-D30W/SN1 models.

9.2 Heating (Continued)

Heating capacity data for MGA-F65W/SN1 and MGA-D65W/SN1 models.

Troubleshooting

11.1 Failure & Protection Codes of the Module

Lists failure and protection codes for the module with their descriptions.

11.2 Troubles and Solutions

Provides common troubles and their possible reasons and solutions.

Troubles and Solutions (Continued)

Lists common troubles, possible reasons, and solutions.

Wiring Installation

12.3.1 Precautions

Important precautions to follow during wiring installation.

12.3.2 Wiring Specification

Specifies wiring categories and common wiring models.

2. Specification of Control Wiring

Details specifications for control wiring, including length and type.

3. Diameter Selection of Grounding Wiring

4. Power Wiring

Covers categories and diameter selection for power wiring.

5. Wiring Connection of Water Flow Switch

Testing

1. Preparation

Preparation steps before performing unit testing.

1) Unit Address Setting

Instructions for setting the unit address switch.

2) Digital Scroll Modular and Normal Scroll Modular Selection

How to select between digital and normal scroll modular types.

2. Testing

Performing the unit testing procedure.

4) Optimizing the Setting Parameters

Optimizing setting parameters based on local conditions.

5) After the Unit Stops

Checks to perform after the unit has stopped.

Maintenance

Warning

Critical warnings regarding fire and flammable gases.

Caution

General cautions for maintaining the unit's condition.

Maintenance for Main Components

Guidance on maintaining key components of the unit.

Descaling

Refrigeration System

Procedures for refrigerant handling, leakage testing, and charging.

Remove Compressor

System Anti-freeze

Precautions and procedures to prevent freezing issues in the system.

Control System

15.1 PCB Outline and Description

Overview and description of the PCB layout for 30kW and 65kW modules.

15.1.1 PCB, Outlook View (30 kW & 65 kW Module)

Visual layout of the PCB with numbered components.

15.1.2 Components Description of 30 kW & 65 kW Module

Description of specific PCB components and their functions.

T3 B, T3 A Temperature Sensors

T4 Temperature Sensor

System A Compressor Discharge Gas Temperature Sensor

Outlet Water Temperature Sensor of Plate Heat Exchanger

9-ADDRESS

Instructions for setting the unit's address for modular systems.

10-COM (O) 485 Communication Port

11-COM (I) 485 Communication Port

12-System A High-Pressure Protection & Discharge Gas Temperature Switch Protection

Explains high-pressure and discharge gas temperature protection for System A.

13-Anti-frost Protection Sensor

14-Water Flow Check

Module Failure & Protection Codes

Controllers

15.3.1 Wired Controller: KJR-08 B;BE

Introduces the wired controller model and its keypad layout.

Name of Keys on the Wired Controller and the Keypad Operation Description

Explains the function of each key on the wired controller.

1. ON;OFF Button

2. Operation Mode Button

3. MANUAL;AUTO Button

4. QUERY Button

Explains how to query unit status information.

6 & 7 TIME ON;OFF Button

8. TEMP SET Button

10. ADDRESS+ Button

11. ADDRESS- Button

12 & 13 PAGEUP;DOWN (TEMP+;-) Button

Wired Controller LCD Screen Functions

Display Operation Mode

Display Query Data

Display Operation Status

Installation Procedure

Details the wiring procedure and principles for controller installation.

Wired Controller Operation Procedures

1. Press AUTO;MANUAL Mode at Shutdown Status

2. Press [TEMP SET], [PAGEUP;TEMP+] or [PAGEDOWN;TEMP-] Button

3. Press [ON;OFF] Button

Operation Procedure of Time ON

Unit Information Query Procedure

1. Press [QUERY] Entering Check Status

Operation Procedure of System Information Querying

Operation Procedure of Water Temperature Setting

Fault Alarm Handling

Explains how fault alarms are indicated and handled.

CCM10 LCD Touch Screen (Optional)

Mechanical Installation

Electrical Installation

Details electrical interface and wiring for the LCD touch screen.

Operation Description of LCD Touch Screen

Describes the base conditions and operation of the LCD touch screen.

Function Description

Explains the overall function and configuration of the LCD control system.

LCD Operation Window

Shows the principal window of the LCD interface.

Query Window Operation

Page 1 of Query Window

Page 2 of Query Window

LCD Setting Window

Mode Setting Window

Malfunction Queried Window

How to query malfunctions and access troubleshooting help.

Error History Window

Weekly Timer Setting Window

Electricity Control Functions

Query Function

Detailed explanation of the query function and navigation.

Mode Setting Function

Detailed explanation of mode setting and unit quantity control.

Operation and Control Mode Settings

Locking Function

Run;Stop Button

Temp. Set Button

Communicate with Unit Group

Operation Mode and Control Mode Setting

Malfunction Alarm Disposing

Power Failure Memory

Timing ON;OFF Function

Midea MGA-D30W/SN1 Specifications

General IconGeneral
BrandMidea
ModelMGA-D30W/SN1
CategoryChiller
LanguageEnglish

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