Midea LSBLG MCF Series - User Manual

Midea LSBLG MCF Series

116 pages

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Midea CAC After-service Application

Commercial Air Conditioner Division

Midea Group

Address: Midea Headquarters Building, 6 Midea Avenue, Beijiao, Shunde, Foshan,

Guangdong, China

Postal code: 528311

Tel: +86-757-26338346 Fax: +86-757-22390205

cac.midea.com global.midea.com

Note: The data in this book may be changed without notice for further improvement on

quality and performance.

LSBLG***/MCF （Flooded Type）

Model:

Technical Service Manual

Water Cooled

Screw Chiller

Table of Contents

Questions and Answers

M
Michael GarciaAug 20, 2025
What to do if my Midea Chiller has high-pressure protection?
- M
  Michele KeyAug 20, 2025
  High-pressure protection in your Midea Chiller can occur due to several reasons:* Poor cooling water quality affecting condenser heat exchange.* Excessive non-condensable gas in the system.* Insufficient cooling water flow or excessively high temperature.* Too much refrigerant or the wrong type.* The discharge shutoff valve not being fully open.To address this, press the red reset button and then reset it manually on the touch screen.
E
Erica CostaAug 22, 2025
What causes low-pressure protection in a Midea Chiller?
- B
  bwelchAug 22, 2025
  If your Midea Chiller is experiencing low-pressure protection, it could be due to:* Insufficient refrigerant.* A malfunctioning EXV.* A too-short delay time for the low-pressure switch alarm.* A clogged filter.* Water in the refrigerant system within the evaporator.* Poor system matching (undersized evaporator or oversized compressor).* Excessive oil in the system.* Insufficient chilled water flow or excessively low temperature.To resolve this, reset it manually on the touch screen.
K
Kayla MarshAug 25, 2025
What to do if my Midea Chiller shows a water flow fault?
- E
  erin32Aug 25, 2025
  If your Midea Chiller displays a water flow fault, it could be due to:* Failure of the water pump, resulting in insufficient water flow.* Failure of the water flow switch or incorrect wiring connection.To resolve this, power off the unit, restore power, and then reset it manually on the touch screen.
E
Edward BassAug 26, 2025
Why does my Midea Chiller have compressor overload protection?
- F
  floresmichaelAug 27, 2025
  Compressor overload protection in your Midea Chiller can be triggered by:* The compressor running continuously under unfavorable conditions like over-current.* A thermal relay setting value that is too low.To fix this, reset it manually on the touch screen.
D
Danielle JonesAug 28, 2025
How to troubleshoot high discharge temperature protection on a Midea Chiller?
- A
  Austin LeachAug 28, 2025
  High discharge temperature protection in your Midea Chiller can occur due to:* Excessive superheat (insufficient refrigerant, EXV failure).* High discharge pressure.* Low oil level and insufficient oil volume.* Operation under poor conditions with a high compression ratio and no auxiliary cooling.* Damaged bearings or screws.* Poor system matching.This protection is automatically relieved once the discharge temperature falls below the set value. Reset it manually on the touch screen.
R
ricardoturnerAug 29, 2025
How to fix power failure protection on a Midea Chiller?
- A
  aguirretonyAug 30, 2025
  If your Midea Chiller is showing a power failure protection error, it's likely because the power quality is poor due to phase inversion, missing a phase, or phase imbalance. To resolve this, reset it manually on the touch screen.
C
calderonkentAug 31, 2025
What causes compressor motor protection in a Midea Chiller?
- K
  Kayla ColemanSep 1, 2025
  Compressor motor protection in your Midea Chiller can be activated by:* Poor motor power quality due to phase inversion, missing phase, over-voltage, or under-voltage.* Motor overheating.To address this, power off the unit, restore power, and then reset it manually on the touch screen.
M
Mark AyalaSep 2, 2025
What triggers anti-freezing protection in a Midea Chiller?
- N
  Nicholas SimonSep 2, 2025
  Anti-freezing protection in your Midea Chiller can be triggered by:* A sharp drop in chilled water flow or excessively low water temperature.* A damaged anti-freezing switch or abnormal wiring connection.To resolve this, reset it manually on the touch screen.
M
millertravisSep 4, 2025
What causes low oil level protection in my Midea Chiller?
- M
  Micheal ChavezSep 4, 2025
  If your Midea Chiller is showing low oil level protection, it could be due to:* Low oil temperature during startup, leading to low-pressure difference and abnormal oil return.* Failure of the return oil solenoid valve or a blocked filter.* Mixing of different oil types, causing an abnormal return oil system.* Oil level switch failure or incorrect wiring connection.* Insufficient oil volume.To resolve this, reset it manually on the touch screen.
W
wstanleySep 6, 2025
Why is contactor protection activated in my Midea Chiller?
- J
  Joseph SchmittSep 6, 2025
  Contactor protection in your Midea Chiller can be caused by:* Abnormal contactor suction during the switch from Y type to ? type.* Vibration during operation causing the contact to loosen.To resolve this, reset manually on the touch screen.

Midea LSBLG MCF Series Specifications

General

Brand	Midea
Model	LSBLG MCF Series
Category	Chiller
Language	English

Summary

Safety Precautions

Installation Safety Considerations

Guidelines for safe unit installation by authorized personnel.

Maintenance Safety Considerations

Safety measures for engineers during maintenance operations.

Repair Safety Considerations

Safety guidelines for performing repairs on the unit.

Product Information

Product Line Up and Nomenclature

Details on available models and naming conventions.

Key Features and Components

Highlights of efficiency, design, evaporator, condenser, and oil system.

Outline Dimensions

Dimensional drawings and data for single and dual head units.

Refrigeration System

Schematics for single and dual compressor refrigeration systems.

Major System Components

Detailed description of key components like the screw compressor.

Pressure Vessels

Information on pressure vessel monitoring, repair, and safety.

Water Flow Specifications

Table of water flow rates and pressure drop curves.

System Water Volume Calculations

Formula and example for calculating minimum system water volume.

Operating Range

Defines acceptable ranges for unit operating parameters.

Accessories

Lists standard and optional accessories with their functions.

Control System

Control Flow Chart and Energy Adjustment

Diagram of control logic and capacity adjustment methods.

Start-Stop Processes and Sensor Information

Procedures for starting/stopping and details on temperature/pressure sensors.

Parts Control and EXV Operation

Control logic for oil heaters, pressure sensors, and EXV controller.

Unit Operation Interface and Modes

Navigating the interface, status displays, and mode settings.

Startup, Shutdown, and Alarm Management

Procedures for startup, shutdown, protection states, and alarms.

Electrical Control

Electrical Data and Components

Specifications and description of key electrical parts.

Parameter Settings and Wiring

Setting electrical parameters and field wiring instructions.

Wiring Diagrams and Connectivity

Detailed schematics and connectivity options.

Installation

Unit Installation and Foundation

Procedures for lifting the unit and preparing the foundation.

Water Pipeline System Installation

Guidelines for water quality, piping, and system design.

Wiring Installation Procedures

General precautions and specifics for wiring the unit.

Commissioning

Pre Start-up Electrical and Refrigeration Inspections

Checklist for electrical and refrigeration system inspections before start-up.

Start-up Procedures and Parameter Checks

Procedures and parameters to inspect during unit start-up.

Maintenance

Daily and Annual Maintenance Tasks

Routine checks, startup, shutdown, and basic maintenance.

Scheduled Maintenance Procedures

Guidelines for visual inspection, component checks, and cleaning.

Heat Exchanger Cleaning and System Checks

Procedures for cleaning heat exchangers and checking systems.

Troubleshooting

Troubleshooting Protection Items

Table of protection mechanisms, their purposes, and possible causes.

Troubleshooting System Issues

Common alarms, trouble descriptions, actions, and possible causes.

Appendix

Temperature Sensor Specifications

Resistance values for discharge, water, ambient, oil, and EXV sensors.

Sample Selection Sheet Details

System description, quality assurance, and equipment specifications.

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