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Daikin AGZ040E - User Manual

Daikin AGZ040E
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Installation, Operation,
and Maintenance Manual
Trailblazer
™
Air-Cooled Scroll Chillers
Model AGZ, E Vintage
30 to 240 Tons (100 to 840 kW)
HFC-410A Refrigerant
50/60 Hz
IOM 1206-7
Group: Chiller
Part Number: IOM1206-7
Date: July 2016

Table of Contents

Questions and Answers

  • A
    Amber MaynardAug 14, 2025
    What causes motor overload relays or circuit breakers to open in my Daikin Chiller?
    • M
      Mitchell FrancisAug 14, 2025
      If motor overload relays or circuit breakers are opening in your Daikin Chiller, it could be due to a voltage imbalance or voltage being out of range, requiring correction of the power supply. Defective or grounded wiring in the motor can also cause this, necessitating compressor replacement. Loose power wiring or burnt contactors are other potential causes; check all connections and tighten them, replacing contactors if needed. High condenser temperature can also trigger this issue; refer to corrective steps for High Discharge Pressure.
  • J
    Juan FergusonAug 21, 2025
    Why is my Daikin Chiller's compressor noisy or vibrating?
    • T
      tbrooksAug 21, 2025
      A noisy or vibrating Daikin Chiller compressor can stem from several issues. It could be due to low lift or an inverted start, which may require control adjustments or condenser fan VFDs. Another cause might be the compressor running in reverse; check the unit and compressor for correct phasing. Improper piping or support on the suction or discharge lines can also lead to noise and vibration, necessitating relocation, addition, or removal of hangers. Worn compressor isolator bushings can be a source of the problem, requiring replacement. In more severe cases, the compressor may have a mechanical failure, which would also require replacement.
  • D
    Daniel ReevesAug 25, 2025
    What causes high discharge pressure in my Daikin AGZ040E Chiller?
    • D
      David HarrellAug 25, 2025
      High discharge pressure in your Daikin Chiller can result from several factors. Noncondensables in the system may be the cause; extract them using approved procedures or replace the charge. The circuit might be overcharged with refrigerant, requiring you to remove the excess and check liquid subcooling. Ensure the optional discharge shutoff valve is open. Incorrect condenser fan control wiring or a non-running fan can also lead to high pressure; correct the wiring or check the electrical circuit and fan motor, respectively. A dirty condenser coil or air recirculation could also be responsible; clean the coil or correct the recirculation issue.
  • T
    Theresa SparksAug 31, 2025
    What to do if my Daikin AGZ040E Chiller compressor will not stage up?
    • K
      Kathy WilsonAug 31, 2025
      If your Daikin Chiller compressor isn't staging up, it could be due to a defective capacity control, which would need replacement. Another possibility is a faulty sensor or wiring, also requiring replacement. Finally, the stages might not be set correctly for the application; adjust the controller settings accordingly.
  • L
    lawrence69Sep 3, 2025
    Why are the compressor staging intervals too short on my Daikin Chiller?
    • M
      Ms. Chelsea SmithSep 4, 2025
      Short compressor staging intervals on your Daikin Chiller can be attributed to several factors. The control band may not be set properly, necessitating an adjustment of the controller settings for the application. A faulty water temperature sensor could be the cause, requiring replacement. Insufficient water flow can also lead to this issue; correct the flow. Other potential causes include rapid temperature or flow swings (stabilize the load), oversized equipment (evaluate equipment selection), the chiller being enabled with no load (evaluate BAS sequence and settings), or light loads (evaluate the need for HGBP or thermal inertia).
  • D
    Danielle YoungSep 10, 2025
    What causes the compressor thermal protection switch to open on my Daikin AGZ040E?
    • E
      Evelyn McclainSep 12, 2025
      The compressor thermal protection switch opening on your Daikin Chiller can be caused by several factors. It could be due to operating beyond design conditions, requiring correction to stay within allowable limits. A discharge valve not being open can also trigger this; ensure the valve is open. Short cycling can lead to this issue; stabilize the load or correct control settings for the application. Voltage range issues or imbalance can be responsible; check and correct the voltage. High superheat can also cause the switch to open; adjust to correct superheat. In some cases, compressor mechanical failure may be the cause, necessitating compressor replacement.
  • T
    Timothy AllenNov 17, 2025
    What to do if my Daikin AGZ040E Chiller compressor will not run?
    • B
      Brittany GoodwinNov 17, 2025
      If your Daikin Chiller compressor isn't running, there are several potential causes. First, ensure that the main or compressor disconnect switch is closed. Check for blown fuses or open circuit breakers, examining electrical circuits and motor windings for shorts or grounds. Also, check for loose or corroded connections, replacing fuses or resetting breakers after correcting any faults. Thermal overloads may have tripped; these are auto-resetting, so check voltages, cycle times, and mechanical operations, allowing time for the reset. A defective contactor or coil could also be the issue, requiring replacement. The system might be shut down by equipment protection devices; determine the cause and correct it before restarting. The unit may not require cooling, so wait until it calls for it. ...
  • B
    Benjamin RileyNov 27, 2025
    How to fix low suction pressure in a Daikin Chiller?
    • R
      Ralph IngramNov 27, 2025
      Low suction pressure in a Daikin Chiller can arise from various causes. Rapid load swings might be the culprit, requiring load stabilization. A lack of refrigerant could be the issue; check for leaks, repair them, and add refrigerant, also check the liquid sight glass. A fouled liquid line filter drier can cause this; check the pressure drop across it and replace if needed. An expansion valve malfunction may also be responsible; repair or replace it and adjust for proper superheat. Low condensing temperature can contribute; check the means for regulating condenser temperature. Other potential causes include compressors not staging properly (see corrective steps - Compressor Staging Intervals Too Low), insufficient water flow (correct the flow), excess or wrong oil used (recover or change t...

Summary

Installation, Operation, and Maintenance Manual

Trailblazer Air-Cooled Scroll Chillers

Installation and Application Information

Operating and Standby Limits

Chilled Water Piping

Evaporator Freeze Protection

Refrigerant Schematics

Dimensions and Weights - Packaged Units

Refrigerant Charge

Electrical Data - Single Point (60;50 Hz)

Electrical Data - Multiple Point (60;50 Hz)

Unit Controller Operation

General Description

Controller Inputs and Outputs

Set Points

Circuit Level Set Points

Sequence of Operation - Cool Mode

Sequence of Operation - Ice Mode

Circuit Sequence of Operation

Unit Functions

Unit Capacity

Unit Capacity Control

Compressor Staging in Cool Mode

Logic for staging compressors in cooling mode.

RapidRestore Option

Fast Loading

Circuit Functions

Circuit Control Logic

Conditions for enabling a circuit and compressor availability.

Circuit States

The four possible states of a refrigerant circuit.

Pumpdown Procedure

Steps involved in performing a pumpdown procedure.

Condenser Target

Staging Up

Conditions and logic for staging condenser fans up.

EXV Control

Superheat Target

Alarms

Unit Fault Alarms

Fault alarms including PVM/GFP, Freeze Protect, Sensor Faults.

Low Evaporator Pressure - Hold

Circuit Fault Alarms

High Condenser Pressure - Unload

Using the Controller

Passwords

Optional Low Ambient Fan VFD

Types of Alarms, Faults, and Errors

Startup and Shutdown Procedures

Pre Startup

Initial inspection and checkout before unit startup.

Startup

Procedures and setpoints for starting the chiller.

Shutdown

Procedures for temporary and extended unit shutdowns.

Component Operation

Hot Gas Bypass (Optional)

Evaporator

Unit Maintenance

Filter-Driers

System Adjustment

Planned Maintenance Schedule

R-410 A Refrigerant

Safety

Refrigerant Charging

Troubleshooting Chart

Warranty Registration Form (Scroll)

Pre Start-Up Checklist

Checklist for pre-startup verification before unit operation.

Refrigeration System

MicroTech Status Check

MicroTech Setpoints

Start-Up

Checklist section for unit startup verification.

Limited Product Warranty

Daikin AGZ040E Specifications

General IconGeneral
BrandDaikin
ModelAGZ040E
CategoryChiller
LanguageEnglish

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