McQuay MDB075B User Manual

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MDB - 2004

Ducted Split Systems

Models: MDB 075-750B

 MDB 125-150C

 MDB 075-500BR

 MDB 125CR

Questions and Answers:

G
George ClaytonAug 4, 2025
Why is my McQuay MDB075B Air Conditioner not cooling properly?
- K
  kbrooksAug 5, 2025
  If your McQuay Air Conditioner is running but not cooling effectively, several factors could be the cause. First, make sure the thermostat isn't set too high; try resetting it. Ensure all doors and windows are completely closed. If these steps don't help, there might be an obstruction blocking the unit's inlet or outlet; remove any objects you find. For issues such as a dirty condenser coil or insufficient refrigerant, it is best to contact your local dealer.
A
Anthony DominguezAug 11, 2025
What to do if both fan and compressor on my McQuay MDB075B Air Conditioner don't work?
- C
  Carolyn TaylorAug 11, 2025
  If neither the fan nor the compressor is working on your McQuay Air Conditioner, there are a few things you can check. First, there may be a power failure; the unit should resume operation when the power supply is restored. Also, the starter may have tripped; try resetting it. Finally, inspect the fuse in the power switch or operating unit and replace it if it's blown.
A
Alexander DeleonAug 19, 2025
How to fix a McQuay MDB075B Air Conditioner when the fan is not working?
- J
  Justin LopezAug 19, 2025
  If the fan on your McQuay Air Conditioner isn't working, start by checking the power supply. If the power supply is fine, the issue might be a faulty fan capacitor or fan motor, in which case you should contact your local dealer. Another potential cause is a faulty switch, which would need to be changed.
D
Dylan HarperAug 27, 2025
What to do if McQuay Air Conditioner fan works, but the compressor doesn't?
- Z
  zsmithAug 27, 2025
  If the fan on your McQuay Air Conditioner is working, but the compressor isn't, there are a few potential reasons. First, the thermostat setting might be too high; try resetting it. It's also possible that the dual pressure control has tripped; in this case, reset the pressure control. For compressor or compressor contractor issues, contact your local dealer.

McQuay MDB075B Specifications

General

Brand	McQuay
Model	MDB075B
Category	Air Conditioner
Language	English

Summary

General Unit Specifications

Safety Control Mechanisms

Safety controls like high/low pressure cut-outs and crankcase heaters for compressor.

Operating Guide and Error Codes

System Error Code Reference

Explains system error codes and their corresponding probable faults for diagnosis.

Performance Characteristics and Curves

50Hz R22 Cooling Performance Data

Wiring and Refrigerant Diagrams

Cooling Wiring Diagram Example

Electrical wiring diagram for MDB 075B and MMC 075C cooling models.

Refrigerant Circuit Diagram

Installation and Piping Guidelines

Indoor Unit Electrical Connection

Guidelines for safe and correct electrical connections for indoor units.

Outdoor Unit Location Criteria

Refrigerant Piping Limits

Refrigerant Charge and Maintenance

Cooling System Refrigerant Charge

Unit Maintenance Procedures

System Operation and Troubleshooting

Sequential Controller Configuration

Troubleshooting Fan Issues

Steps to diagnose and fix issues when the fan is not working.

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