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Midea MGB-D65W/RN1 - User Manual

Midea MGB-D65W/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

  • W
    William McclureAug 20, 2025
    How to fix over high air discharge pressure in Midea MGB-D65W/RN1 Chiller (Cooling operation)?
    • K
      Kevin GonzalezAug 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.
  • M
    Michael NobleAug 22, 2025
    What to do if my Midea Chiller compressor stops because of motor Overload?
    • M
      Michael MilesAug 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
    Autumn YoungAug 25, 2025
    What causes a Midea Chiller compressor to stop due to freeze-proof protection (Cooling operation)?
    • N
      newmankathleenAug 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).
  • S
    Samantha TranAug 27, 2025
    What causes over low air suction pressure in Midea MGB-D65W/RN1 Chiller (Cooling operation)?
    • A
      Alexis SimpsonAug 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).
  • A
    Amber MckinneyAug 28, 2025
    Why is the air suction pressure over high in my Midea MGB-D65W/RN1 Chiller (Cooling operation)?
    • J
      Jacqueline McguireAug 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).
  • H
    harveyjohnAug 29, 2025
    Why is the air suction pressure over high in my Midea MGB-D65W/RN1 (Heating operation)?
    • D
      diane50Aug 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).
  • A
    alexander99Aug 31, 2025
    What causes a Midea MGB-D65W/RN1 compressor to stop due to Hi-pressure protection?
    • M
      michaelstewartAug 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).
  • S
    Shelby SmithSep 2, 2025
    How to fix over high air discharge pressure in Midea Chiller (Heating operation)?
    • V
      Victor BushSep 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.
  • S
    Shannon TaylorSep 4, 2025
    What causes a Midea MGB-D65W/RN1 Chiller compressor to stop because of Lo-pressure protection?
    • A
      Alexis DennisSep 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).
  • A
    Ashley DeckerSep 6, 2025
    How to fix over low air discharge pressure in Midea MGB-D65W/RN1 Chiller (Cooling operation)?
    • M
      Maria Andrews MDSep 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

Key Features of Chiller Units

Low Ambient Temperature Cooling

Details the cooling and heating operating temperature ranges for specific models.

Wide Outlet Water Temperature Range

Describes selectable outlet water temperatures for cooling and heating modes.

Advanced Operational Features

Covers humanized remote control, digital scroll tech, modular design, and system combinations.

Applicable Temperature Ranges

Technical Specifications

Refrigeration System Diagrams

5.1 25;30 KW Module Refrigeration Sketch

5.2 55;60;65 KW Module Refrigeration Sketch

5.3 130 KW Module Refrigeration Sketch

5.4 185 KW Module Refrigeration Sketch

5.5 250 KW Module Refrigeration Sketch

Electrical Wiring Diagrams

7.1 Chiller Wiring Diagram

Illustrates the electrical connections for the main chiller unit.

Electric Characteristics Data

Performance Capacity Tables

Troubleshooting Guide

11.1 Failure & Protection Codes (25;30 kw Module)

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

11.2 Module-Specific Troubleshooting Codes

Provides fault and protection codes for new 30kw, 55/60/65kw, 130kw, 185kw, and 250kw modules.

11.3 Troubles and Solutions

Offers potential causes and solutions for common operational issues.

Installation Procedures

12.1 Unit Installation and Transportation

Covers physical setup, handling, and transport of the unit.

12.2 Installation Space Requirements

Specifies minimum clearance and site considerations for proper unit installation.

12.3 Installation Foundation

Details requirements for the installation base and foundation structure.

12.4 Water System Installation

Guides on connecting chilled water pipelines, including flushing and component requirements.

12.5 Wiring Installation

Provides instructions and precautions for electrical wiring connections.

Commissioning Procedures

13.1 Preparation Steps

Outlines necessary steps before starting up the unit, like flushing and pre-heating.

13.2 Test Run Procedure

Details the process for conducting a trial run and final checks.

Maintenance Guidelines

14.1 General Component Maintenance

Covers regular checks on pressure, connections, and electrical elements.

14.2 Scale Removal Procedures

14.4 System Anti-Freezing Measures

Details measures to prevent freezing in the water-side heat exchanger and piping.

Control System Overview

15.1 PCB Outline and Component Description

Identifies key components and their functions on the main control boards.

15.2 Wired Controller Operation

Explains how to use the wired controller for system operation, settings, and querying.

Midea MGB-D65W/RN1 Specifications

General IconGeneral
BrandMidea
ModelMGB-D65W/RN1
CategoryChiller
LanguageEnglish

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