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Daikin McQuay AGZ-D - User Manual

Daikin McQuay AGZ-D
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Operating and Maintenance Manual
OMM 1087
Group: Chiller
Part Number: OMM 1087
Effective: October 2011
Supercedes: October 2010
Air-Cooled Scroll Compressor Chiller
AGZ-D 25 to 190 Tons
50 - 60-Hertz, R-410A
Software Version 251699101

Table of Contents

Questions and Answers

  • B
    bkleinAug 8, 2025
    What to do if Daikin McQuay AGZ-D Chiller compressor will not run?
    • M
      Mr. Michael HollowayAug 8, 2025
      If the compressor will not run, try the following: close the switch; check electrical circuits and motor windings for shorts or grounds, investigate for possible overloading, and replace the fuse or reset breakers after the fault is corrected; check for loose or corroded connections; repair or replace components; determine the type and cause of shutdown and correct it before resetting the equipment protection switch; repair or replace the solenoid coil and check wiring; check the motor for opens, shorts, or burnout; check all wire junctions and tighten all terminal screws.
  • S
    Steven DayAug 14, 2025
    How to fix high discharge pressure in Daikin McQuay AGZ-D?
    • P
      philipmartinezAug 14, 2025
      To address high discharge pressure: extract the noncondensables using approved procedures, remove excess refrigerant and check liquid subcooling, open the valve, check FanTrol wiring, check the electrical circuit and fan motor, clean the coil, and correct any identified issues.
  • M
    Michael SmithAug 23, 2025
    What to do if Daikin McQuay AGZ-D compressor oil level is too high or too low?
    • L
      Laura DavisAug 23, 2025
      If the compressor oil level is too high or too low, review refrigerant piping and correct it, check and add oil, check and tighten the system, adjust the thermal expansion valve, adjust flow, check the crankcase heater, reset the expansion valve for higher superheat, check the liquid line solenoid valve operation, stabilize the load or increase the staging interval.
  • C
    Cameron FoxAug 29, 2025
    How to handle Daikin McQuay AGZ-D Chiller compressor losing oil?
    • A
      Aaron OrtizAug 30, 2025
      If the compressor is losing oil, check for leaks and repair them, and add refrigerant. Also, adjust superheat and replace the crankcase heater.

Summary

Introduction

General Description

Overview of the chiller's components, features, and factory testing procedures.

Hazard Identification Information

Defines DANGER, WARNING, and CAUTION symbols used in the manual for safety.

Ambient Air Temperature Limitations

Standard;High Ambient Panels

Specifies operating limits for ambient air temperature and high ambient options.

System Water Volume Considerations

Explains the importance of water volume for system stability and avoiding short cycling.

Glycol Solutions

Glycol Solutions Impact

Explains the impact of glycol on system capacity, flow rate, and pressure drop.

Evaporator Freeze Protection

Evaporator Freeze Protection Measures

Discusses measures and recommendations to protect the evaporator from freezing.

Operating;Standby Limits

Operating and Standby Limits

Lists maximum and minimum ambient and water temperature limits for operation.

MicroTech III Controller Overview

Controller Overview

Introduces the MicroTech III controller's design, benefits, and user interface.

Controller Inputs and Outputs

Details analog and digital inputs/outputs for the main controller.

Controller Modules

Compressor Module 1

Lists analog inputs and digital inputs/outputs for Compressor Module 1.

Compressor Module 2

Lists analog inputs and digital inputs for Compressor Module 2.

Controller Setpoints and Configuration

Unit Level Setpoints

Setpoints for mode, staging, capacity, configuration, timers, and alarms.

Circuit Setpoints

Setpoints that exist individually for each circuit, including condenser settings.

Auto Adjusted Ranges

LWT and Network Cool Set Point Ranges

Auto-adjusted ranges for LWT and network cool set points.

Low Ambient Lockout Ranges

Auto-adjusted ranges for low ambient lockout settings.

Security and Unit Functions

Security Settings

Explains password protection for setpoints and access levels.

Unit Capacity Control

Explains how unit capacity is estimated, controlled, and overridden.

Unit Mode Selection

Explains how operating mode is determined by setpoints and inputs.

Compressor Staging and Operation

Compressor Staging in Cool Mode

Explains compressor staging logic, delays, and sequence in cool mode.

Staging Sequence Logic

Defines compressor staging logic for starting and stopping.

Circuit Functions and Alarms

Circuit Control Logic

Explains circuit enabling, compressor availability, and circuit states.

Unit Fault Alarms

Details PVM/GFP Fault, Evaporator Flow Loss, and other unit fault alarms.

VFD Interface and Control

Optional Low Ambient Fan VFD

Details the optional VFD fan control for low ambient operation.

VFD Interface (HMI)

Describes the HMI location, function, and key operations.

Startup and Maintenance

Start-Up Procedures

Step-by-step guide for starting the chiller, including pre-start checks.

Planned Maintenance Schedule

Schedule for weekly, monthly, and annual maintenance tasks.

Service and Troubleshooting

Refrigerant Charging

Procedures for charging R-410A and checking operation.

Filter-Driers

Discusses filter-drier replacement criteria and pressure drops.

AGZ-D Troubleshooting Chart

Lists common problems, causes, and corrective steps for the AGZ-D chiller.

Warranty and Training

Limited Warranty Information

Information on McQuay's limited warranty and finding representatives.

McQuay Training and Development

Information on training resources and obtaining product updates.

Daikin McQuay AGZ-D Specifications

General IconGeneral
BrandDaikin
ModelMcQuay AGZ-D
CategoryChiller
LanguageEnglish

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