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McQuay MMC150C - User Manual

McQuay MMC150C
163 pages
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MDB - 2004
Ducted Split Systems
Models: MDB 075-750B
MDB 125-150C
MDB 075-500BR
MDB 125CR

Table of Contents

Questions and Answers

  • E
    ebergerAug 10, 2025
    Why is my McQuay MMC150C Air Conditioner not cooling properly?
    • J
      Jeffrey DelgadoAug 10, 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
    Andrea BrownAug 17, 2025
    What to do if both fan and compressor on my McQuay MMC150C Air Conditioner don't work?
    • A
      Adam SchroederAug 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.
  • A
    April SotoAug 25, 2025
    How to fix a McQuay Air Conditioner when the fan is not working?
    • K
      Kendra SchneiderAug 26, 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.
  • M
    Mindy RoySep 1, 2025
    What to do if McQuay MMC150C Air Conditioner fan works, but the compressor doesn't?
    • C
      Crystal RichardsonSep 1, 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.

Summary

Nomenclature System

Product Features

Operating Guide

Specifications Tables

Cooling Only Specifications

Tabulated specifications for cooling-only models, including electrical and physical data.

Heatpump Specifications

Heatpump Cooling Capacity Data

Tabulated cooling capacities and related specifications for heatpump units.

Performance Characteristics

50 Hz R22 Cooling Performance Data

Tables showing cooling capacity (kW) at different indoor/outdoor temperatures.

Heatpump Performance Data

50 Hz R22 Heatpump Performance

Tables detailing heatpump performance at different temperature inputs.

Power Tables

Cooling Power Consumption Tables

Tabulated power data for cooling models across various operating conditions.

Cooling Wiring Diagrams

MDB 075 B - MMC 075 C Cooling Wiring

Wiring diagram for MDB 075B indoor and MMC 075C outdoor units in cooling mode.

Heatpump Wiring Diagrams

Refrigerant Circuit Diagrams

Capillary Tube and Thermal Expansion Valve Circuits

Diagrams showing refrigerant flow for different expansion valve types.

Indoor Unit Installation

Outdoor Unit Installation

Field Piping Guidelines

System Refrigerant Charge Guidelines

Servicing and Maintenance Procedures

Operation and Controller Settings

Sequential Controller Configuration

Details on setting up the controller for compressor and heater stages.

Troubleshooting Guide

No Cooling Troubleshooting Flowcharts

Cooling Performance Issue Diagnosis

Insufficient Cooling and High Pressure Causes

Troubleshooting steps for low cooling and high discharge pressure issues.

Low Pressure and Condenser Airflow Issues

Diagnostic steps for low pressure and condenser airflow problems.

Pressure and Noise Troubleshooting Charts

High and Low Suction Pressure Causes

Troubleshooting charts for high and low suction pressure conditions.

Noisy Operation Troubleshooting

Steps to identify and resolve causes of abnormal noise during operation.

McQuay MMC150C Specifications

General IconGeneral
BrandMcQuay
ModelMMC150C
CategoryAir Conditioner
LanguageEnglish

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