Midea MGB-D65W/RN1

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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:

K
Kayla PhillipsSep 12, 2025
What to do if my Midea MGB-D65W/RN1 Chiller compressor can’t start?
- T
  Timothy JonesSep 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).
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).
K
Kristina PhelpsSep 18, 2025
What could cause abnormal noise from the compressor in my Midea MGB-D65W/RN1 Chiller?
- E
  Erin WoodsSep 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).
J
James GonzalezSep 14, 2025
What to do if my Midea MGB-D65W/RN1 compressor stops because of integrate temperature sensor or air discharge temperature protection?
- A
  Amanda JohnsonSep 14, 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
julia55Sep 10, 2025
How to fix over low air discharge pressure in Midea Chiller (Heating operation)?
- A
  Adam CollinsSep 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”.
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.

Midea MGB-D65W/RN1 Specifications

General

Brand	Midea
Model	MGB-D65W/RN1
Category	Chiller
Language	English

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 2530 KW Module Refrigeration Sketch

5.2 556065 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 (2530 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.

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