Midea MGB-D30W/RN1 - User Manual

Questions and Answers

J
Jonathan BatesAug 20, 2025
How to fix over high air discharge pressure in Midea Chiller (Cooling operation)?
- Z
  ztannerAug 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.
N
Natalie SimonAug 22, 2025
What to do if my Midea MGB-D30W/RN1 Chiller compressor stops because of motor Overload?
- R
  Renee MeyerAug 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).
C
Cody RoblesAug 25, 2025
What causes a Midea MGB-D30W/RN1 compressor to stop due to freeze-proof protection (Cooling operation)?
- R
  Richard FrenchAug 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).
M
Matthew JohnsonAug 26, 2025
What causes over low air suction pressure in Midea Chiller (Cooling operation)?
- J
  Jamie CoxAug 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).
L
Lori SmithAug 28, 2025
Why is the air suction pressure over high in my Midea MGB-D30W/RN1 (Cooling operation)?
- M
  Mark GreenAug 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).
E
edward31Aug 29, 2025
Why is the air suction pressure over high in my Midea MGB-D30W/RN1 (Heating operation)?
- J
  joneslauraAug 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).
M
Mark RoblesAug 31, 2025
What causes a Midea MGB-D30W/RN1 Chiller compressor to stop due to Hi-pressure protection?
- M
  Michael GrayAug 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).
J
james57Sep 2, 2025
How to fix over high air discharge pressure in Midea MGB-D30W/RN1 Chiller (Heating operation)?
- C
  Catherine LeblancSep 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
sherry44Sep 4, 2025
What causes a Midea MGB-D30W/RN1 Chiller compressor to stop because of Lo-pressure protection?
- D
  David JensenSep 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
Adam LarsonSep 6, 2025
How to fix over low air discharge pressure in Midea MGB-D30W/RN1 Chiller (Cooling operation)?
- C
  Chase FischerSep 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

Product Schedule

Lists product specifications and capacities.

Features

Modular Design

Explains the flexible modular design and combination capabilities.

Specification

Model and Cooling Capacity

Lists chiller models with their cooling capacity in kW and Btu/h.

Heating Capacity

Details the heating capacity of the chiller units.

Power Supply Details

Specifies voltage, phase, frequency, manual switch, and fuse.

Compressor Specifications

Information on compressor type, quantity, model, brand, capacity, input.

Power Input and Current Ratings

Details cooling and heating power input and current ratings.

Refrigerant and Control

Specifies refrigerant type and control method.

Condenser (Air Side) Specifications

Describes air-side heat exchanger type and fan specifications.

Evaporator (Water Side) Specifications

Details water-side heat exchanger and pipeline specifications.

Unit Dimensions

Provides net and packing dimensions in mm and inch.

Safety Protection Devices

Dimension

25;30 KW Module Dimensions

Provides dimensional drawings and data for 25/30KW modules.

55;60;65 KW Module Dimensions

Dimensional drawings and data for 55/60/65KW modules.

130 KW Module Dimensions

Dimensional drawings and data for the 130KW module.

185 KW Module Dimensions

Dimensional drawings and data for the 185KW module.

250 KW Module Dimensions

Dimensional drawings and data for the 250KW module.

Refrigeration System Drawing

Piping Diagram

Wire Diagrams

Chiller Wiring Diagram

General wiring diagram for the chiller unit.

Networking Communication Schematic

Electric Characteristics

Model and Electrical Specifications

Lists chiller models with their electrical characteristics.

Power Supply and Outdoor Unit Parameters

Electrical supply and outdoor unit parameters.

Compressor Electrical Specifications

Details compressor electrical specifications like TOCA, MFA, LRA, RLA, KW, FLA.

Capacity Tables

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

Cooling capacity data for MGB-F(D)25W/RN1 model.

MGB-F(D)25 W;RN1 Heating Capacity

Heating capacity data for MGB-F(D)25W/RN1 model.

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

Cooling capacity data for MGB-F(D)30W/RN1 model.

MGB-F(D)30 W;RN1 Heating Capacity

Heating capacity data for MGB-F(D)30W/RN1 model.

MGB-F55 W;RN1 Cooling Capacity

Cooling capacity data for MGB-F55W/RN1 model.

MGB-F55 W;RN1 Heating Capacity

Heating capacity data for MGB-F55W/RN1 model.

MGB-F60 W;RN1 Cooling Capacity

Cooling capacity data for MGB-F60W/RN1 model.

MGB-F60 W;RN1 Heating Capacity

Heating capacity data for MGB-F60W/RN1 model.

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

Cooling capacity data for MGB-F65W/RN1 and MGB-D65W/RN1.

MGB-F65 W;RN1, MGB-D65 W;RN1 Heating Capacity

Heating capacity data for MGB-F65W/RN1 and MGB-D65W/RN1.

MGB-F130 W;RN1 Cooling Capacity

Cooling capacity data for MGB-F130W/RN1 model.

MGB-F130 W;RN1 Heating Capacity

Heating capacity data for MGB-F130W/RN1 model.

MGB-F185 W;RN1 Cooling Capacity

Cooling capacity data for MGB-F185W/RN1 model.

MGB-F185 W;RN1 Heating Capacity

Heating capacity data for MGB-F185W/RN1 model.

MGBT-F250 W;RN1 Cooling Capacity

Cooling capacity data for MGBT-F250W/RN1 model.

MGBT-F250 W;RN1 Heating Capacity

Heating capacity data for MGBT-F250W/RN1 model.

Exploded View

Troubleshooting

Failure and Protection Codes of the Module

Lists fault and protection codes for the chiller modules.

Troubles and Solutions

Lists common troubles and their corresponding solutions.

Installation

Unit Installation

General guidelines and procedures for installing the unit.

Installation Space Requirements

Parallel Installation Space Requirements

Water System Installation

Guidelines for installing the water system.

Chilled Water Pipe Connection Requirements

Chilled Water Flow

Wiring Installation

Instructions for performing wiring installation.

Wiring Installation Precautions

Safety precautions for wiring installation.

Power Supply Specifications

Detailed power supply specifications for various models.

Wiring Connection Requirements

Wiring Steps

Step-by-step instructions for wiring the unit.

Commissioning

Preparation for Commissioning

Steps for preparing the unit before commissioning.

Test Run Procedures

Procedures for conducting a test run on the unit.

Maintenance

Main Component Maintenance

Routine maintenance procedures for key components.

Refrigeration System Checks

Checks and procedures for the refrigeration system.

Control System

PCB Outline and Description

Overview and description of the main control PCB.

25;30 KW Module Component Descriptions

30 KW New Module Component Descriptions

130 KW Module Component Descriptions

250 KW Module Component Descriptions

Protection Functions

Water Flow Detection Information

Wired Controller Operation

Controller Button Functions

Fault Alarm Handling

Midea MGB-D30W/RN1 Specifications

General

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

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