McQuay MDM Series User Manual

McQuay MDM Series

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CMDM - 2004

McQuay

MDM Air Handling Unit

Table of Contents

Questions and Answers:

A
Ashley BrooksAug 18, 2025
Why is the airflow too high in my McQuay Air Handler?
- M
  Mr. Michael SmithAug 18, 2025
  Excessive airflow in your McQuay Air Handler can be attributed to several factors: * **Ductwork:** Oversized ductwork can lead to higher than expected airflow. * **System Integrity:** An open access door or a system that is not properly balanced can cause excessive airflow. If the system's resistance is less than specified, it can also result in high airflow. * **Components:** Missing registers or grilles, dampers set to bypass coils, or missing filters can all contribute to increased airflow.
B
Barbara GutierrezAug 23, 2025
What to do for AC hum in McQuay Air Handler?
- V
  vincentblackAug 23, 2025
  If you're hearing an AC hum in your McQuay Air Handler, it could be due to a few electrical issues: * Check for AC hum in the motor or relay. * Also, check the motor bearings. * Another potential cause is single phasing a 3-phase motor.
S
stephaniejohnsonAug 28, 2025
How to improve air quality from McQuay MDM Air Handlers?
- A
  Anthony CookAug 28, 2025
  If the air in the room isn't fresh when using your McQuay Air Handler, consider the following: * Check if the filter(s) is dirty and replace it if necessary. * Ensure that the fresh air volume is adequate for the space.

McQuay MDM Series Specifications

General

Casing Construction	Galvanized steel
Coil Options	Hot water, chilled water, DX, steam
Fan Types	Forward curved, backward inclined
Drive Type	Direct or belt drive
Voltage	208-575V, 3-phase

Summary

Nomenclature System

Features

High-Strength

Details the robust construction and frame of the unit.

Low Air Leakage Design Assures High Thermal And Filtration Efficiencies

Explains the unique design for maximum strength and preventing air leakage.

Excellent Thermal Barrier

Describes the insulation system for thermal performance and preventing condensation.

Improved Indoor Air Quality

Focuses on features enhancing indoor air quality, like cleanability and drain pans.

Internal Motor & Fan Isolation

Covers factory-installed isolation for noise and vibration reduction.

Outlines & Dimensions

Horizontal Arranged Unit Dimension

Provides dimensional drawings for horizontal unit configurations.

Vertical Arranged Units Dimension

Provides dimensional drawings for vertical unit configurations.

Filter Section

Mixing Section

Section Weights

Coil and Cabinet Weights

Presents weights for coil configurations and unit cabinets.

Motor Weights

Lists the weights of various motor outputs.

Installation

Receiving

Guidance on inspecting units upon delivery and handling potential damage.

Rigging

Instructions and illustrations for safely moving the air handling units.

Storage

Recommendations for storing units prior to installation to prevent damage.

Foundation

Unit Installation

Maintenance

General

Key aspects of a good maintenance plan and general cleaning.

Month Intervals

Scheduled maintenance tasks to be performed at six-month intervals.

Troubleshooting

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