McQuay MMC125BR - 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

D
Dakota PerezAug 9, 2025
Why is my McQuay MMC125BR not cooling properly?
- A
  Andre AndersonAug 9, 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.
G
George JohnsonAug 17, 2025
What to do if both fan and compressor on my McQuay Air Conditioner don't work?
- S
  Spencer RoseAug 17, 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.
V
Victor PaceAug 25, 2025
How to fix a McQuay Air Conditioner when the fan is not working?
- E
  Erik HernandezAug 25, 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.
P
Phillip VanceAug 31, 2025
What to do if McQuay Air Conditioner fan works, but the compressor doesn't?
- A
  Amanda WestAug 31, 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 MMC125BR Specifications

General

Brand	McQuay
Model	MMC125BR
Category	Air Conditioner
Language	English

Summary

Specifications

Performance Characteristics

Cooling performance data for various models under different conditions.

Wiring Diagrams (Cooling)

MDB 075 B - MMC 075 C Model

Cooling wiring diagram for MDB 075B & MMC 075C models.

Wiring Diagrams (Heatpump)

INDOOR (EXPORT) MDB 075;100 BR (C3.0 B)

Heatpump wiring diagram for MDB 075/100BR (export) indoor unit.

Installation (Outdoor)

Location For Installation Of The Condensing Units

Field Piping

Maximum Pipe Length And Maximum Number Of Bends

Servicing And Maintenance

Safety Cautions

Important safety warnings regarding compressor operation and gas handling.

Troubleshooting

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