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Midea MGB-F30W/RN1 - User Manual

Midea MGB-F30W/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 BellAug 20, 2025
    How to fix over high air discharge pressure in Midea MGB-F30W/RN1 Chiller (Cooling operation)?
    • E
      eramosAug 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
    mwillisAug 22, 2025
    What to do if my Midea MGB-F30W/RN1 compressor stops because of motor Overload?
    • A
      Angela ColemanAug 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
    Crystal McculloughAug 25, 2025
    What causes a Midea MGB-F30W/RN1 Chiller compressor to stop due to freeze-proof protection (Cooling operation)?
    • J
      Julie CooperAug 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).
  • T
    Thomas BrownAug 26, 2025
    What causes over low air suction pressure in Midea Chiller (Cooling operation)?
    • N
      Nathan CunninghamAug 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).
  • S
    Sandra MaynardAug 28, 2025
    Why is the air suction pressure over high in my Midea MGB-F30W/RN1 (Cooling operation)?
    • J
      James BeckAug 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).
  • V
    Vincent HubbardAug 29, 2025
    Why is the air suction pressure over high in my Midea MGB-F30W/RN1 (Heating operation)?
    • R
      robertwestAug 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).
  • C
    Christy BakerAug 31, 2025
    What causes a Midea Chiller compressor to stop due to Hi-pressure protection?
    • M
      Michele MeadowsAug 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).
  • B
    Brooke WoodsSep 2, 2025
    How to fix over high air discharge pressure in Midea MGB-F30W/RN1 (Heating operation)?
    • C
      charles73Sep 3, 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.
  • J
    James DavisSep 4, 2025
    What causes a Midea MGB-F30W/RN1 compressor to stop because of Lo-pressure protection?
    • L
      Leslie AndersonSep 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).
  • J
    Jeffery AdamsSep 6, 2025
    How to fix over low air discharge pressure in Midea Chiller (Cooling operation)?
    • S
      Sheila JohnsonSep 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

Specification

Safety Protection Devices Overview

Lists various safety features and protection mechanisms integrated into the chiller system.

Wire Diagrams

Chiller Wiring Diagram

Provides the main electrical wiring schematic for the chiller units.

Networking Communication Schematic

Electric Characteristics

Electrical Specifications Table

Lists electrical characteristics like voltage, current, and power for various models.

Capacity Tables

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

Presents cooling and heating capacity data for MGB-F(D)25W/RN1 models.

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

Provides cooling and heating capacity data for MGB-F(D)30W/RN1 models.

9.3 MGB-F55 W;RN1 Capacity Data

Lists cooling and heating capacity data for MGB-F55W/RN1 models.

9.4 MGB-F60 W;RN1 Capacity Data

Provides cooling and heating capacity data for MGB-F60W/RN1 models.

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

Lists cooling and heating capacity data for MGB-F65W/RN1 and MGB-D65W/RN1 models.

9.6 MGB-F130 W;RN1 Capacity Data

Presents cooling and heating capacity data for MGB-F130W/RN1 models.

9.7 MGB-F185 W;RN1 Capacity Data

Provides cooling and heating capacity data for MGB-F185W/RN1 models.

9.8 MGBT-F250 W;RN1 Capacity Data

Lists cooling and heating capacity data for MGBT-F250W/RN1 models.

Troubleshooting

Module Failure & Protection Codes

Lists common fault and protection codes for various chiller modules.

Troubles and Solutions Guide

Provides common operational troubles, their possible reasons, and solutions.

Installation

Unit Installation Procedures

Outlines the general steps and requirements for installing the chiller unit.

Transportation and Handling Guidelines

Installation Space Requirements

Installation Foundation Requirements

Damping Device Installation

Water System Installation Procedures

Covers the process of connecting the chiller to the water system.

Chilled Water Pipe Connection Requirements

Chilled Water Quality Standards

Target Flow Controller Installation Guide

Water System Pipeline Installation Methods

Chilled Water Flow Rate Parameters

System Store Tank and Expansion Tank Design

Pump Selection and Installation

Covers the process of selecting and installing the system's pumps.

Wiring Installation Procedures and Precautions

Outlines general wiring installation guidelines and essential safety precautions.

Wiring Steps

Provides step-by-step instructions for completing electrical wiring connections.

Water Pump Wiring Diagrams

Commissioning

Preparation Steps for Commissioning

Details the necessary preparations before initiating the unit's commissioning process.

Test Run Procedures

Explains the steps involved in conducting a successful test run of the unit.

Maintenance

Main Component Maintenance Guidelines

General maintenance instructions for key chiller components.

Scale Removal Procedure

Winter Shutdown Procedures

Replacement Parts Information

Post-Shutdown Startup Procedures

Refrigeration System Checks and Procedures

Details checks and procedures for the refrigeration system, including leak detection.

Compressor Disassembly Steps

Auxiliary Electric Heater Information

System Anti-Freezing Measures

Necessary measures to prevent freezing within the water system.

Control System

PCB Outline and Description

Overview and description of the chiller's printed circuit boards.

Module PCB Views and Component Descriptions

Sensor and Protection Code Details

Communication Port and System Protection Details

Faults and Protection Descriptions

Explains system faults and protection mechanisms.

Wired Controller Operation Guide

Instructions for operating the wired controller and its functions.

Keypad Operation and LCD Screen Description

Wired Controller Operation Procedures

Fault Alarm Handling and Notes

Hysteresis Temperature Setting Procedure

Temperature-Resistance Characteristic Sheets

Pipe Sensor Characteristics

Provides temperature-resistance data for pipe temperature sensors.

Discharge Temperature Sensor Characteristics

Lists temperature-resistance data for digital compressor discharge sensors.

Midea MGB-F30W/RN1 Specifications

General IconGeneral
BrandMidea
ModelMGB-F30W/RN1
CategoryChiller
LanguageEnglish

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