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Midea MGB Series - User Manual

Midea MGB Series
174 pages
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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

  • E
    Emily EspinozaAug 20, 2025
    How to fix over high air discharge pressure in Midea MGB (Cooling operation)?
    • B
      bonnieschroederAug 20, 2025
      High air discharge pressure during cooling can stem from several issues. It could be due to air or non-condensing gas in the system, requiring you to discharge the gas and re-vacuum if needed. Dirty condenser fins or obstructions can also cause this, so clean the fins. Inspect the condenser fan for errors and ensure sufficient chilling air volume. Also, check if the ambient temperature is too high. Finally, if the refrigerant charging volume is excessive, discharge the extra refrigerant. If the air suction pressure is excessive high, refer to the section addressing that specific issue.
  • 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).
  • B
    Brittany CruzAug 31, 2025
    What causes a Midea MGB compressor to stop due to Hi-pressure protection?
    • S
      Shannon RodriguezAug 31, 2025
      If the compressor stops because of high-pressure protection, it could be due to over high air expelling pressure (refer to that section) or a faulty high-pressure switch (replace if defective).
  • K
    Kathryn KramerSep 2, 2025
    How to fix over high air discharge pressure in Midea Chiller (Heating operation)?
    • P
      Patricia DicksonSep 2, 2025
      High air discharge pressure during heating can be caused by insufficient water flow (adjust based on temperature difference), air or non-condensing gas in the system (discharge gas and re-vacuum if needed), scaling in the heat exchanger (descale), or high chilling water inlet temperature (check water temperature). If the air suction pressure is excessive high, refer to the section addressing that specific issue.
  • K
    Karen LamSep 4, 2025
    What causes a Midea MGB compressor to stop because of Lo-pressure protection?
    • K
      kelly82Sep 4, 2025
      If the compressor stops due to low-pressure protection, it could be a blocked filter in front or rear of the expanding valve (replace the filter), a faulty low-voltage switch (replace it), or excessive low air suction pressure (refer to that section).
  • 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.

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

25;30 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

25;30 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 W;RN1

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

MGB-F130 W;RN1

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

Exploded View

MGB-F25 W;RN1 MGB-F30 W;RN1

Exploded parts diagram for 25/30KW chiller models.

MGB-F130 W;RN1

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 sensor，ambient temperature sensor，inlet water temperature sensor and outlet water temperature sensor.

Provides resistance characteristics for various temperature sensors.

Midea MGB Series Specifications

General IconGeneral
BrandMidea
ModelMGB Series
CategoryChiller
LanguageEnglish

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