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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.
  • Q
    qdavisNov 2, 2025
    Why is my McQuay Air Handler vibrating?
    • J
      John LopezNov 3, 2025
      Vibration in your McQuay Air Handler can stem from several sources. Check the following: * **Drive Components:** Ensure that the sheave is securely fastened to the shaft on both the motor and fan. Loose, overly tight, or worn belts can also cause vibration. Verify the belt cross-section is correct and that belts are matched in length if it's a multi-belt drive. Misaligned sheaves or a motor, motor base, or fan that isn't securely anchored can also lead to vibrations. Also, ensure that belts are free from oil or dirt. * **Bearing Condition:** A defective, loose, or misaligned bearing can cause significant vibration. Also, check for fretting corrosion between the inner race and shaft. * **Impeller Issues:** If the impeller is loose on the shaft, unbalanced, or has foreign material on ...
  • O
    Olivia CooperNov 7, 2025
    What to do if my McQuay Air Handlers airflow is low?
    • S
      Samantha MayerNov 7, 2025
      If you're experiencing low airflow from your McQuay Air Handler, consider these potential causes: * Check if the forward curve impeller is installed backward or if the fan is running backward. * Ensure the impeller is centered with the inlet cones. * Verify the fan speed is adequate. * Assess whether the actual system is more restrictive than expected. * Make sure dampers and registers are open and properly connected. * Inspect for leaks in supply ducts, open duct seams, or loose insulating duct liner. * Confirm fire dampers are open. * Check for internal cabinet leaks. * Address obstructions in the high velocity air stream (obstruction near fan outlet, sharp elbows near fan outlet, improperly designed or no turning vanes, projections, dampers or other obstruction in par...
  • E
    Elizabeth OconnorNov 12, 2025
    What causes rattling in McQuay MDM Air Handlers?
    • D
      David GonzalezNov 12, 2025
      Rattling noises in your McQuay Air Handler can arise from several factors: * **Air Velocity:** High air velocity, particularly through cracks, holes, or past obstructions, can cause rattling. Leaks in ductwork, registers, or grilles can be the source. * **Ductwork Issues:** Rattles and rumbles often stem from excessive duct velocities or vibrating ductwork. * **Connections:** A flex connector that is too tight or touching other components can produce rattling sounds. * **Cabinet Components:** Vibrating cabinet parts or parts that are not properly isolated from the building's structure can also generate rattles. * **Obstructions:** Dampers, registers, loose dampers or splitters, grilles, sharp elbows, or sudden expansions or contractions in ductwork can cause noise. Also, check f...

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

McQuay MDM Series Specifications

General IconGeneral
Casing ConstructionGalvanized steel
Coil OptionsHot water, chilled water, DX, steam
Fan TypesForward curved, backward inclined
Drive TypeDirect or belt drive
Voltage208-575V, 3-phase

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