Midea MGCSL-D30W/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:

S
Sean LawrenceSep 12, 2025
What to do if my Midea Chiller compressor can’t start?
- M
  Melissa PadillaSep 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).
I
ihodgeAug 22, 2025
What to do if my Midea MGCSL-D30W/RN1 Chiller compressor stops because of motor Overload?
- S
  Stephanie KennedyAug 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).
M
Margaret MaysAug 25, 2025
What causes a Midea MGCSL-D30W/RN1 Chiller compressor to stop due to freeze-proof protection (Cooling operation)?
- M
  Michael OrtizAug 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).
D
David HollowayAug 26, 2025
What causes over low air suction pressure in Midea MGCSL-D30W/RN1 (Cooling operation)?
- D
  David GrahamAug 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).
J
John JonesAug 28, 2025
Why is the air suction pressure over high in my Midea MGCSL-D30W/RN1 Chiller (Cooling operation)?
- J
  James HickmanAug 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).
M
Mrs. Mindy LeeAug 30, 2025
Why is the air suction pressure over high in my Midea Chiller (Heating operation)?
- J
  johnhunterAug 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).
U
ugibsonSep 18, 2025
What could cause abnormal noise from the compressor in my Midea Chiller?
- R
  Rachel HinesSep 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).
A
Amanda GriffinSep 13, 2025
What to do if my Midea MGCSL-D30W/RN1 compressor stops because of integrate temperature sensor or air discharge temperature protection?
- J
  Jeffrey BrownSep 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).
R
regina98Sep 10, 2025
How to fix over low air discharge pressure in Midea MGCSL-D30W/RN1 Chiller (Heating operation)?
- S
  Stephanie RamseySep 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”.
K
Kevin JohnsonSep 6, 2025
How to fix over low air discharge pressure in Midea MGCSL-D30W/RN1 Chiller (Cooling operation)?
- A
  adrian97Sep 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 MGCSL-D30W/RN1 Specifications

General

Brand	Midea
Model	MGCSL-D30W/RN1
Category	Chiller
Language	English

Summary

3. Specification

Model MGB-F25 WRN1 MGB-F30 WRN1

Cooling Capacity

Heating Capacity

8 Electric Characteristics

Model

Lists chiller models with their electrical characteristics.

9 Capacity Tables

9.1 MGB-F(D)25 WRN1 Cooling:

Presents cooling capacity and power data based on water outlet and ambient temperatures.

Heating:

Presents heating capacity and power data based on water outlet and ambient temperatures.

11 Troubleshooting

11.1 Failure & Protection Codes of the Module

Lists fault codes and their corresponding troubles for the chiller module.

12 Installation

12.1 Unit Installation

Provides instructions for installing the chiller unit.

12.1.1 Transportation

12.1.2 Installation space

Specifies the required clearance and arrangement space for unit installation.

12.1.3 Installation Foundation

Describes the requirements for the installation foundation and mounting.

13 Commissioning

1. Preparation

Outlines the necessary preparations before starting the commissioning process.

2. Test run

Details the steps for conducting a trial run and initial setup of the unit.

14 Maintenance

Maintenance for main components

Provides general guidelines for maintaining the chiller's key components.

Removing scale

Refrigeration system

15 Control System

15.1 PCB Outline and Description

Shows the layout and describes the components of the main control board.

15.1.2 2530 kw module components description

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