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Midea MGB-F65W/RN1 - User Manual

Midea MGB-F65W/RN1
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

  • J
    James FletcherAug 20, 2025
    How to fix over high air discharge pressure in Midea MGB-F65W/RN1 Chiller (Cooling operation)?
    • K
      Kaitlyn BaileyAug 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.
  • U
    usanchezAug 22, 2025
    What to do if my Midea Chiller compressor stops because of motor Overload?
    • J
      jennifer34Aug 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).
  • A
    Ashley WuAug 25, 2025
    What causes a Midea Chiller compressor to stop due to freeze-proof protection (Cooling operation)?
    • D
      David MaddoxAug 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).
  • R
    Regina CooperAug 26, 2025
    What causes over low air suction pressure in Midea MGB-F65W/RN1 (Cooling operation)?
    • M
      morrisrobertAug 27, 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).
  • L
    llarsonAug 28, 2025
    Why is the air suction pressure over high in my Midea MGB-F65W/RN1 Chiller (Cooling operation)?
    • E
      emily90Aug 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).
  • G
    george81Aug 30, 2025
    Why is the air suction pressure over high in my Midea Chiller (Heating operation)?
    • C
      Connor PetersonAug 30, 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).
  • D
    Douglas LynnSep 1, 2025
    What causes a Midea Chiller compressor to stop due to Hi-pressure protection?
    • R
      Robert SmithSep 1, 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).
  • D
    Derrick WrightSep 2, 2025
    How to fix over high air discharge pressure in Midea MGB-F65W/RN1 (Heating operation)?
    • J
      Joseph MyersSep 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.
  • A
    Alexander HillSep 4, 2025
    What causes a Midea MGB-F65W/RN1 compressor to stop because of Lo-pressure protection?
    • D
      daniel24Sep 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
    Tiffany ArellanoSep 6, 2025
    How to fix over low air discharge pressure in Midea MGB-F65W/RN1 Chiller (Cooling operation)?
    • M
      matthewberrySep 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

3 Specification

3.1 MGB-F25 W;RN1 and MGB-F30 W;RN1 Specifications

Provides detailed technical specifications for specific chiller models.

5 Refrigeration System Drawing

5.1 25;30 KW Module Refrigeration System Sketch

5.2 55;60;65 KW Module Refrigeration System Sketch

5.3 130 KW Module Refrigeration System Sketch

5.4 185 KW Module Refrigeration System Sketch

5.5 250 KW Module Refrigeration System Sketch

6 Piping Diagram

6.1 25;30 KW Module Water Pipeline Sketch

6.2 30 KW Module Water Pipeline Sketch

6.3 55;60;65 kw Module Water Pipeline Sketch

6.4 130 KW Module Water Pipeline Sketch

6.5 185 KW Module Water Pipeline Sketch

6.6 250 KW Module Water Pipeline Sketch

7 Wire Diagrams

7.1 Chiller Wiring Diagram

Provides electrical wiring diagrams for various chiller modules.

7.2 Networking Communication Schematic

8 Electric Characteristics

8.1 Electric Characteristics Table

9 Capacity Tables

9.1 MGB-F(D)25 W;RN1 Cooling Capacity

Presents cooling capacity and power data for 25/30KW units at various temperatures.

9.2 MGB-F(D)30 W;RN1 Cooling Capacity

Provides cooling capacity and power data for 30KW units at various temperatures.

9.3 MGB-F55 W;RN1 Cooling Capacity

Details cooling capacity and power data for 55KW units at various temperatures.

9.4 MGB-F60 W;RN1 Cooling Capacity

Lists cooling capacity and power data for 60KW units at various temperatures.

9.5 MGB-F65 W;RN1, MGB-D65 W;RN1 Cooling Capacity

Presents cooling capacity and power data for 65KW units at various temperatures.

9.6 MGB-F130 W;RN1 Cooling Capacity

Details cooling capacity and power data for 130KW units at various temperatures.

9.7 MGB-F185 W;RN1 Cooling Capacity

Shows cooling capacity and power data for 185KW units at various temperatures.

9.8 MGBT-F250 W;RN1 Cooling Capacity

Lists cooling capacity and power data for 250KW units at various temperatures.

11 Troubleshooting

11.1 Failure & Protection Codes of the Module

Lists fault codes and their meanings for 25/30KW modules.

11.2 New 30 kw Module Failure & Protection Codes

Provides fault codes for new 30KW module variants.

11.3 55;60;65 kw Module (Fixed Speed) Failure & Protection Codes

Troubleshooting codes for 55/60/65KW fixed speed units.

11.4 65 kw Digital Module Failure & Protection Codes

Lists fault codes for 65KW digital modules.

11.5 130 kw Module Failure & Protection Codes

Troubleshooting codes for 130KW modules.

11.6 185 kw Module Failure & Protection Codes

Lists fault codes for 185KW modules.

11.7 250 kw Module Failure & Protection Codes

Troubleshooting codes for 250KW modules.

11.8 Troubles and Solutions

Provides common issues and their corresponding solutions.

12 Installation

12.1 Unit Installation

Covers general installation procedures, including transportation and unit placement.

12.2 Water System Installation

Outlines procedures for connecting and maintaining the chilled water system.

12.3 Wiring Installation

Details electrical wiring procedures, precautions, and power supply specifications.

13 Commissioning

13.1 Preparation

Steps to take before starting the unit for the first time.

13.2 Test Run

Procedures for conducting an initial trial run and parameter adjustment.

14 Maintenance

14.1 Maintenance for Main Components

14.6 Refrigeration System

14.7 System Anti-Freezing

15 Control System

15.1 PCB Outline and Description

15.1.1 25;30 kw Module PCB Details

15.1.3 New 30 kw Module PCB Details

15.1.5 55;60;65 kw Module PCB Details

15.1.7 65 kw Digital Module PCB Details

15.1.9 185 kw Module PCB Details

15.1.11 250 kw Module PCB Details

15.2 Wired Controller Operation

Midea MGB-F65W/RN1 Specifications

General IconGeneral
BrandMidea
ModelMGB-F65W/RN1
CategoryChiller
LanguageEnglish

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