McQuay MDB100D User Manual

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MDB - D - 2004

Ducted Blower Split Systems

Models: MDB 075 - 500D

 MDB 075 - 500DR

MDB 125/150 D/DR

MDB 200 - 500 D/DR

MMC 075 - 150 D/DR

Questions and Answers:

A
Ashley ElliottAug 8, 2025
Why is my McQuay Air Conditioner working but not cooling properly?
- H
  heather48Aug 8, 2025
  If your McQuay Air Conditioner isn't cooling well, it might be due to several reasons. First, ensure the thermostat isn't set too high by resetting it. Check that all doors and windows are properly closed. Also, make sure there are no obstructions blocking the unit's inlet or outlet; if there are, remove them. For issues such as a dirty condenser coil or insufficient refrigerant charge, it's best to contact your local dealer for assistance.
M
Mrs. Megan GregoryAug 18, 2025
What to do if both fan and compressor of McQuay MDB100D Air Conditioner do not work?
- T
  Timothy HoltAug 19, 2025
  If both the fan and compressor on your McQuay Air Conditioner aren't working, there could be a few reasons. First, check for a power failure and wait for the power supply to resume. If there was a starter trip, try resetting the starter. Also, inspect the power switch or operating unit for a blown fuse, and replace it if necessary.
K
kristymendezAug 29, 2025
Why is the compressor not working on my McQuay MDB100D Air Conditioner, but the fan is?
- J
  Jennifer WhiteAug 29, 2025
  If the fan in your McQuay Air Conditioner is running but the compressor isn't, it could be due to a few things. First, make sure the thermostat isn't set too high; if it is, reset it. Another possibility is a dual pressure control trip, in which case you should reset the pressure control. If the compressor itself or the compressor contactor is faulty, it's best to contact your local dealer.

McQuay MDB100D Specifications

General

Brand	McQuay
Model	MDB100D
Category	Air Conditioner
Language	English

Summary

Nomenclature System

General Specifications

Safety Controls

Lists safety features including pressure cut-outs, overload protection, and phase protection.

Specifications: Cooling only 50Hz (R22)

Specifications: Heatpump 50Hz (R22)

Specifications: Cooling only 50Hz (R407C)

Specifications: Cooling only 220V – 60Hz (R22)

Performance Tables

R22 50Hz COOLING CAPACITY

Cooling capacity performance data for R22, 50Hz models under various conditions.

Operating Range

Cooling only

Shows allowable operating temperature ranges for cooling mode.

Heat pump

Shows allowable temperature ranges for heatpump operation.

Blower Performance Curves

Wiring Diagrams (Cooling)

Wiring Diagrams (Heatpump)

Refrigerant Circuit Diagram

Installation (Indoor)

ELECTRICAL CONNECTION

Rules and precautions for connecting electrical wiring for safe operation.

Installation (Outdoor)

LOCATION FOR INSTALLATION OF THE CONDENSING UNITS

FIELD PIPING

Guidelines for refrigerant piping arrangements and component installation.

Vacuuming and Charging

VACUUMING

Procedure for evacuating the system to remove air and moisture.

CHARGING

Steps for charging the system with refrigerant and monitoring parameters.

Guidelines of Field-Charging Air Conditioning Systems with Scroll Compressors

FIELD-CHARGING – SOME PRECAUTION POINTS

Critical precautions for field charging scroll compressors to prevent damage.

CHARGE LIMITS

Lists charge limits for different compressor models to prevent overcharging.

Special Precautions For R407c

3) Characteristic

5) Handling And Installation Guidelines

Specific precautions for handling and installing R407C systems, including filter-dryer use.

Servicing And Maintenance

MAINTENANCE

Operation

SEQUENTIAL CONTROLLER BLOCK DIAGRAM

Sequential Controller LCD Operating Instructions

2. OPERATING GUIDE

Guide to using the sequential controller's keys, modes, and settings.

3. ERROR CODE

Troubleshooting

1. Fan does not work

4. Air-conditioner works but cooling not satisfactory

No Cooling

No Cooling ( Compressor Does Not Start )

Flowchart for diagnosing cooling issues when the compressor fails to start.

Insufficient Cooling

High Discharge Pressure

Diagnosing cooling issues related to high discharge pressure.

High Suction Pressure

Low Suction Pressure

Noisy Operation

Compressor Noisy

Evaporator Fan Noisy

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