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McQuay ACZ 039A - User Manual

McQuay ACZ 039A
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Installation, Operation and Maintenance Manual
IOMM ACZ1
Group:
Chiller
Part Number
: 330262002
Effective:
December 2001
Supersedes:
New
Air-Cooled Scroll Condensing Units
ACZ 010A – ACZ 039A
10 to 43 Tons, 35 to 150 kW
R-22, 60 Hertz

Table of Contents

Questions and Answers

  • J
    Julie ByrdAug 17, 2025
    What to do if the McQuay Heat Pump compressor will not run?
    • C
      Chad WebbAug 17, 2025
      If the McQuay Heat Pump compressor will not run, first ensure the main switch is closed. Check for blown fuses or open breakers, inspecting electrical circuits and motor windings for shorts, overloads, and loose connections; replace the fuse or reset the breaker if necessary. Also, check if thermal overloads have tripped (they auto reset). Inspect the contactor or coil for defects and repair or replace if needed. Determine if a protection device has shut the system off and correct the cause. If no cooling is required, the compressor should start on a call for cooling. Check if the liquid line solenoid will not open and repair or replace the coil if needed. Inspect the motor for open or short circuits, or burnout. Finally, check all wire junctions and tighten all terminals.
  • A
    Austin FlemingAug 20, 2025
    What to do if my McQuay ACZ 039A Heat Pump has high discharge pressure?
    • R
      Robert ChristensenAug 20, 2025
      If your McQuay Heat Pump has high discharge pressure, it could be due to several reasons. First, there might be noncondensables in the system, which should be removed using authorized procedures. Another cause could be a refrigerant overcharge, so remove the excess. Check if the fan is running and inspect the electrical circuit. Dirty condenser coils can also cause this issue, so clean the coil. Lastly, the FanTrol might be out of adjustment, so adjust the FanTrol setting.
  • M
    Matthew SullivanAug 23, 2025
    Why is my McQuay ACZ 039A compressor noisy or vibrating?
    • S
      Stephanie MeadowsAug 23, 2025
      If your McQuay Heat Pump compressor is noisy or vibrating, it may be due to refrigerant flooding the compressor, so check the expansion valve setting. Another cause could be improper line support, in which case you should relocate or add supports. Finally, the compressor might be worn, requiring replacement.
  • W
    wilsonjessicaAug 26, 2025
    What causes motor overload relays to open or blown fuses in McQuay Heat Pump?
    • R
      Robert GillespieAug 26, 2025
      Motor overload relays opening or blown fuses in your McQuay Heat Pump can be caused by several factors. These include: 1. Low voltage during high loads, in which case you should check the supply voltage. 2. Defective or grounded motor wiring, requiring you to replace the compressor. 3. Loose power wiring, so check all connections and tighten them. 4. High condensing temperature (see steps for high discharge pressure). 5. Unbalanced voltage, so check the voltage and contact the power company.
  • T
    Thomas McdonaldAug 28, 2025
    What to do if my McQuay ACZ 039A Heat Pump has low suction pressure?
    • B
      Beth BrooksAug 28, 2025
      If your McQuay Heat Pump has low suction pressure, it could be due to a lack of refrigerant, so check for leaks and repair and replace the refrigerant. Another cause could be a dirty evaporator, which needs to be cleaned chemically. A clogged filter-drier can also cause this, so replace it. Additionally, the expansion valve might be malfunctioning; check and adjust for proper superheat. Low condensing temperature can also be a factor; check discharge pressure control settings.
  • H
    Heather HoldenAug 30, 2025
    Why is my McQuay ACZ 039A Heat Pump's compressor losing oil?
    • M
      Monique HinesAug 31, 2025
      If your McQuay Heat Pump's compressor is losing oil, it could be due to a lack of refrigerant, so check for leaks and repair them. Another cause could be suction superheat being too high, so adjust the superheat. Lastly, the crankcase heater might be burned out, requiring replacement.
  • J
    Julie BrownSep 2, 2025
    What causes low discharge pressure in a McQuay Heat Pump?
    • D
      Daniel MaySep 3, 2025
      Low discharge pressure in a McQuay Heat Pump can be caused by a faulty condenser control, so check the condenser control operation. It can also be caused by a low refrigerant charge, so check for leaks and add refrigerant. Another possible cause is low suction pressure; see the low suction pressure steps.
  • D
    David FullerSep 5, 2025
    What causes high suction pressure in a McQuay ACZ 039A Heat Pump?
    • H
      Harold RoseSep 5, 2025
      High suction pressure in a McQuay Heat Pump can be caused by an excessive load, so reduce the load or add capacity. It may also be caused by the expansion valve overfeeding, so check the remote bulb and regulate superheat.
  • C
    Carlos HarrisSep 8, 2025
    What causes a McQuay Heat Pump unit to not load or unload?
    • W
      whiteheatherSep 8, 2025
      If a McQuay Heat Pump unit will not load or unload, it could be due to a faulty controller sensor or a broken wire, requiring replacement. Another cause could be stages not set for the application, so adjust the thermostat setting.
  • T
    Terry HendricksSep 12, 2025
    Why does my McQuay Heat Pump have a short load/unload interval?
    • N
      nicholas52Sep 12, 2025
      If your McQuay Heat Pump has a load/unload interval that is too short, it could be due to an erratic thermostat, in which case you should replace it. Another cause could be insufficient water flow, so adjust the flow.

Summary

Unit Installation and Initial Setup

Introduction and General Description

Provides an overview of the unit's features, assembly, and basic operation.

Installation and Handling Procedures

Covers unit placement, handling, clearances, and vibration isolation for proper installation.

Chilled Water System Requirements

Covers water piping, system volume, and flow switch installation for water-cooled applications.

Refrigerant System and Components

Refrigerant Piping Guidelines

Details on sizing, routing, and installation of refrigerant piping for optimal performance.

Liquid Line Installation Details

Specific guidance on sizing and installation of liquid refrigerant lines.

Unit Component Location

Identifies the location of key components within the unit.

Unit Specifications and Data

Physical Data Tables

Detailed tables on unit dimensions, weights, and capacities for different models.

Electrical Data and Wiring

Information on power supply, wiring requirements, and electrical schematics.

Dimensional Data and Diagrams

Visual representations and measurements of unit sizes and connection points.

Control System Operation

Control Center and Layout

Describes the main electrical control panel and its components.

Start-up, Shutdown, and Sequence

Procedures for initial unit startup, normal shutdown, and operational sequences.

MicroTech II Controller Functions

Explains the controller's features, inputs, outputs, setpoints, and alarms.

Using the Controller Interface

Guidance on navigating menus, changing setpoints, and understanding the display.

System Maintenance and Service

System Maintenance Procedures

Routine checks and maintenance for condensers and refrigerant sightglass.

Service and Repair Information

Details on servicing expansion valves, filter-driers, and solenoids.

Optional Controls and Features

Information on SpeedTrol and Hot Gas Bypass systems for enhanced operation.

Troubleshooting and Alarms

Unit Alarms and Limits

Details on shutdown alarms, limit alarms, and unit enable conditions.

Troubleshooting Common Issues

A chart detailing problems, causes, and corrective actions for unit malfunctions.

McQuay ACZ 039A Specifications

General IconGeneral
BrandMcQuay
ModelACZ 039A
CategoryHeat Pump
LanguageEnglish

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