Midea MGB Series

Midea MGB Series

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Air-cooled modular chiller unit 50Hz MCAC-ATSM-2011-12

2

Content

1 General information ................................................................................ 3

2. Features ................................................................................................... 5

3. Specification ........................................................................................... 9

4 Dimension .............................................................................................. 21

5 Refrigeration system drawing .............................................................. 33

6. Piping diagram ...................................................................................... 36

7 Wiring diagrams..................................................................................... 42

8 Electric characteristics ......................................................................... 56

9 Capacity tables ...................................................................................... 58

10 Exploded view ...................................................................................... 74

11 Troubleshooting ................................................................................... 96

12 Installation .......................................................................................... 108

13 Commissioning .................................................................................. 132

14 Maintenance ....................................................................................... 135

15 Control system .................................................................................. 137

Appendix ................................................................................................. 174

Questions and Answers:

A
Autumn FritzSep 12, 2025
What to do if my Midea MGB compressor can’t start?
- A
  Aaron WilliamsSep 12, 2025
  If the compressor won't start, check for a tripped overcurrent relay or burnt fuse (replace), power to the control circuit (check wiring), high or low voltage protection (refer to air suction and discharge pressure error sections), burnt contactor coils (replace), incorrect phase sequence (reconnect any two of the three phases), water system error or shorted flow-type volume controller (check water system), or error signals from the wire controller (identify and address the error).
W
waltersthomasAug 22, 2025
What to do if my Midea MGB compressor stops because of motor Overload?
- J
  Joseph WilliamsAug 22, 2025
  If the compressor stops due to motor overload, the issue might be high air expelling and suction pressure (refer to those sections), voltage problems (ensure voltage isn't 20V above or below rated), a motor short circuit (check motor resistor connections), or an overload assembly error (replace the assembly).
G
gillespienancyAug 25, 2025
What causes a Midea MGB compressor to stop due to freeze-proof protection (Cooling operation)?
- A
  Aaron BarnesAug 25, 2025
  The compressor might stop due to freeze-proof protection because of insufficient chilling water flow (check/repair the pump or flow control), gas in the water loop (discharge the air), or a thermal resistor error (replace it if confirmed).
X
xwilliamsonAug 26, 2025
What causes over low air suction pressure in Midea Chiller (Cooling operation)?
- M
  mccartybrittanyAug 26, 2025
  Low air suction pressure can occur due to several reasons: insufficient water flow (adjust flow based on temperature difference), low inlet chilled-water temperature (check installation), refrigerant leaks or insufficient refrigerant (find and repair leaks or recharge), or scaling in the evaporator (descale).
D
Diana BuchananAug 27, 2025
Why is the air suction pressure over high in my Midea MGB Chiller (Cooling operation)?
- M
  Maria PhillipsAug 28, 2025
  High air suction pressure in cooling mode can result from overcharged refrigerant (discharge excess) or high inlet chilled-water temperature (check water pipeline insulation).
C
cynthiaclaytonAug 29, 2025
Why is the air suction pressure over high in my Midea MGB (Heating operation)?
- P
  Patricia WillisAug 29, 2025
  Excessive air suction pressure during heating can be due to overheated air at the air heat exchanger (check ambient temperature) or overcharging of refrigerant (discharge the excess).
E
Emily Sexton MDSep 17, 2025
What could cause abnormal noise from the compressor in my Midea Chiller?
- M
  Michael LeeSep 18, 2025
  Abnormal compressor noise can be due to liquid refrigerant entering the compressor from the evaporator, causing liquid slugging (adjust refrigerant charge), or the compressor aging (replace the compressor).
K
kimberly08Sep 13, 2025
What to do if my Midea MGB Chiller compressor stops because of integrate temperature sensor or air discharge temperature protection?
- B
  Bailey WalkerSep 13, 2025
  If the compressor stops due to the integrated temperature sensor or air discharge temperature protection, check for high or low voltage (ensure it's within 20V of the rated voltage), high air expelling pressure or low air suction pressure (refer to those sections), or a component error (check the integrated temperature sensor after the motor cools down).
J
Jeffrey BookerSep 10, 2025
How to fix over low air discharge pressure in Midea MGB (Heating operation)?
- T
  tonya81Sep 10, 2025
  Low air discharge pressure during heating may be caused by low chilling water temperature (check it) or refrigerant leakage or insufficient refrigerant volume (test for leaks and recharge). If the air suction pressure is too low, see the section on “Excessive low air suction pressure”.
T
Tracy WilsonSep 6, 2025
How to fix over low air discharge pressure in Midea MGB Chiller (Cooling operation)?
- G
  gallegosmarieSep 6, 2025
  Low air discharge pressure during cooling operation might be caused by a low surrounding temperature (measure the temperature) or a refrigerant leak or insufficient refrigerant (find the leak and recharge). If the suction pressure is low, refer to the “low suction pressure” section.

Midea MGB Series Specifications

General

Brand	Midea
Model	MGB Series
Category	Chiller
Language	English

Summary

General Information

Nomenclature

Describes the model naming convention for the chiller units.

Product schedule

Lists available chiller models with their key specifications and parameters.

External appearance

Visual representations of the different chiller module sizes and designs.

Features

Low ambient temperature cooling function

Details the chiller's capability to operate in low ambient temperatures.

Wide range of outlet water temperature

Covers the adjustable settings for chilled water outlet temperature.

Built-in hydraulic module

Highlights the benefits of the integrated hydraulic system for installation and space.

Humanization remote control

Explains the user-friendly remote control features for convenient operation.

Digital scroll technique

Describes the advanced digital scroll compressor technology for precise capacity control.

Modular design

Focuses on the flexibility, scalability, and ease of design/installation of the modular system.

Environmental care

Covers the use of eco-friendly refrigerants and design considerations.

Economical operation

Explains features contributing to energy efficiency and cost savings.

Back up function

Details system redundancy and how failures are handled to maintain operation.

Specification

Refrigeration system drawing

2530 KW module refrigeration system sketch drawing

Illustrates the refrigeration circuit for the 25/30KW chiller modules.

130 KW module refrigeration system sketch drawing

Depicts the refrigeration circuit diagram for the 130KW chiller module.

Piping diagram

2530 KW module water pipeline sketch drawing

Details the water pipeline layout for the 25/30KW chiller modules.

6.5 250 KW module water pipeline sketch drawing

Illustrates the water pipeline schematic for the 250KW chiller module.

Wire Diagrams

Chiller wiring diagram

Provides electrical schematics for the chiller unit's main wiring.

Networking communication schematic of main unit and auxiliary unit

Details the communication wiring for connecting multiple chiller units.

Capacity Tables

MGB-F(D)25 WRN1

Presents cooling capacity and power data for 25/30KW models.

MGB-F130 WRN1

Provides cooling capacity and power data for the 130KW model.

Exploded View

MGB-F25 WRN1 MGB-F30 WRN1

Exploded parts diagram for 25/30KW chiller models.

MGB-F130 WRN1

Exploded parts diagram for the 130KW chiller model.

Troubleshooting

Failure & Protection Codes of the Module

Lists error codes and protection codes for module failures.

Troubles and Solutions

Provides common troubleshooting steps and possible solutions for system issues.

Installation

Unit Installation

Covers general procedures for installing the chiller unit.

Installation space

Specifies the required clearance and space for unit installation.

Water System Installation

Details the procedures and requirements for connecting the water system.

Wiring Installation

Covers the procedures and precautions for electrical wiring installation.

Commissioning

Preparation

Outlines the necessary steps before starting the unit's commissioning.

Test run

Describes the procedure for conducting the initial test run of the unit.

Maintenance

Maintenance for main components

General guidelines for maintaining the primary components of the unit.

Removing scale

Instructions for cleaning scale from the water-side heat exchanger.

System anti-freezing

Measures and precautions to prevent freezing in the water system.

Control System

PCB Outline and Description

Identifies and describes the components on the main control PCB.

Wired controller

Explains the operation and functions of the wired controller.

Appendix

Accessories

Lists the accessories included with the unit.

Temperature-Resistance characteristic sheet for pipe temperature sensorambient temperature sensorinlet water temperature sensor and outlet water temperature sensor.

Provides resistance characteristics for various temperature sensors.

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