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Daikin AGZ225E - User Manual

Daikin AGZ225E
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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

  • S
    Samantha MayerAug 15, 2025
    What causes motor overload relays or circuit breakers to open in my Daikin AGZ225E?
    • A
      Alexander BakerAug 15, 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.
  • A
    Anthony RodriguezAug 21, 2025
    Why is my Daikin Chiller's compressor noisy or vibrating?
    • D
      Dave ClarkAug 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.
  • J
    Jeffrey ColeAug 25, 2025
    What causes high discharge pressure in my Daikin AGZ225E Chiller?
    • R
      Rebecca WelchAug 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.
  • M
    Mary Mitchell PhDAug 31, 2025
    What to do if my Daikin AGZ225E compressor will not stage up?
    • A
      aguilarsarahAug 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.
  • P
    Pamela SandersSep 4, 2025
    Why are the compressor staging intervals too short on my Daikin Chiller?
    • K
      Kristina JonesSep 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).
  • H
    Hector ShawSep 10, 2025
    What causes the compressor thermal protection switch to open on my Daikin AGZ225E Chiller?
    • C
      Cynthia CamposSep 10, 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
    Tamara ParksNov 17, 2025
    What to do if my Daikin AGZ225E compressor will not run?
    • S
      Steven JacksonNov 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. ...
  • A
    alisonmcdanielNov 26, 2025
    How to fix low suction pressure in a Daikin AGZ225E Chiller?
    • T
      Tommy HowardNov 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

Details on the Trailblazer™ Air-Cooled Scroll Chillers, including model numbers and capabilities.

Installation and Application Information

Operating and Standby Limits

Table detailing the maximum and minimum operating and standby ambient and fluid temperatures.

Unit Placement

Service Clearance

Chilled Water Piping

Requirements and recommendations for field-installed chilled water piping.

Water Flow Limitations

Evaporator Freeze Protection

Methods and components used to protect the evaporator from freeze-up.

High Ambient Operation

Requirements for operating the chiller in high ambient temperature conditions.

Condenser Coil Options and Coating Considerations

Pressure Drop Data

Table 11: Pressure Drop Data

Table detailing pressure drop values for different flow rates and models.

Electrical Data

Table 14: Electrical Data - Single Point (60;50 Hz)

Electrical specifications for single-point connections across various voltages and frequencies.

Table 16: Electrical Data - Single Point (60;50 Hz)

Electrical specifications for single-point connections across various voltages and frequencies.

Table 18: Electrical Data - Multiple Point (60;50 Hz)

Electrical specifications for multiple-point connections across various voltages and frequencies.

Table 20: Electrical Data - Multiple Point (60;50 Hz)

Electrical specifications for multiple-point connections across various voltages and frequencies.

Unit Controller Operation

Controller Inputs and Outputs

Detailed lists of analog and digital inputs and outputs for the main controller and compressor modules.

Set Points

Default and adjustable set point values for unit configuration and operation.

Table 38: Unit Level Set Point Defaults and Ranges

Table of default and adjustable set point ranges for unit-level configurations.

Table 47: Commincation Configuration

Configuration settings for network communication protocols like Lon, BACnet, and Modbus.

Circuit Level Set Points

Set points applicable to individual circuits, including mode, compressor, EXV, and fan controls.

Table 48: Set Points for Individual Circuits

Table detailing set points for individual circuits, covering mode, EXV, and sensor offsets.

Dynamic Set Point Ranges and Defaults

Condenser target and fan stage deadband settings based on configuration groups.

Security

Information on password protection for accessing and changing set points.

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Flowchart illustrating the unit's operational sequence in Cool Mode, from power up to readiness.

Figure 48: Unit Sequence of Operation - Cool Mode (continue)

Continuation of the operational sequence for Cool Mode, detailing capacity increase and load satisfaction.

Figure 49: Unit Sequence of Operation - Cool Mode (continued)

Further steps in Cool Mode sequence, covering capacity decrease and shutdown logic.

Figure 50: Unit Sequence of Operation - Ice Mode

Flowchart detailing the unit's operational sequence in Ice Mode.

Figure 51: Unit Sequence of Operation - Ice Mode (continued)

Continuation of Ice Mode sequence, covering capacity increase and ice cycle completion.

Unit Functions

Unit Capacity

Unit Enable

Conditions and tables for enabling and disabling the chiller operation.

Freeze Protection

Conditions that trigger evaporator pump start for freeze protection and when it ends.

LWT Target

How the Leaving Water Temperature (LWT) target is selected and adjusted.

Unit Capacity Control

Methods for controlling unit capacity, including compressor staging and limits.

Compressor Staging in Cool Mode

Logic for starting and stopping compressors based on evaporator LWT in Cool Mode.

Staging Sequence

Logic for determining which compressor starts or stops next, balancing circuits.

RapidRestore Option

Description of the RapidRestore® option for faster restart and loading capabilities.

Sound Reduction

Circuit Functions

Circuit Control Logic

Conditions required for circuit enabling and compressor availability.

Circuit States

Description of the four circuit states: Off, Preopen, Run, and Pumpdown.

Pumpdown Procedure

Low Ambient Starts

Initiation and handling of low ambient starts, including timer and alarm logic.

Circuit Status

Table defining circuit status based on various conditions.

Compressor Control

Logic for controlling compressor operation, including starting and stopping.

Condenser Fan Control

Condenser Staging

EXV Control

Control states and operation of the Electronic Expansion Valve (EXV).

Superheat Target

Selection of suction superheat target based on circuit capacity.

Position Commands

Reliability improvements for EXV positioning commands.

Low Evaporator Pressure

High Condenser Pressure

Alarms

Unit Fault Alarms

Description of unit fault alarms, including triggers, actions, and resets.

Evaporator Flow Loss

Alarm triggered by loss of evaporator flow, requiring rapid stop of circuits.

Evaporator Water Freeze Protect

Alarm triggered when evaporator LWT drops below freeze protect set point.

Unit Problem Alarms

Alarms related to evaporator pump failures.

Unit Warning Alarms

Warning alarms for external events and input signal issues.

Circuit Fault Alarms

Fault alarms specific to individual circuits.

Alarm Logs

How to access and interpret alarm and event logs.

Using the Controller

Navigating

How to navigate the controller menus using the keypad and wheel.

Passwords

Procedures for entering passwords to access different parameter levels.

Optional Low Ambient Fan VFD

VFD Interface

Description of the VFD controller interface for viewing data and alarms.

Table 83: Types of Alarms, Faults, and Errors

Classification and response to different types of alarms, faults, and errors detected by the VFD.

Startup and Shutdown Procedures

Pre Startup

Pre-Startup Water Piping Checkout

Pre-Startup Electrical Check Out

Startup

Procedures for starting the chiller after all pre-startup checks are complete.

Post Startup

Shutdown

Procedures for temporarily and indefinitely shutting down the chiller.

Component Operation

Hot Gas Bypass (Optional)

VFD Low Ambient Control (Optional)

Compressor Communications

Warnings and Alerts

Evaporator

Unit Maintenance

All-Aluminum Condenser Coils

System Adjustment

Table 88: Planned Maintenance Schedule

R-410 A Refrigerant

Safety

POE Lubricants

Refrigerant Charging

Procedures for recharging the unit with R-410A refrigerant.

charging procedure

Troubleshooting Chart

Compressor Will Not Run

Compressor Noisy Or Vibrating

High Discharge Pressure

Low Suction Pressure

Compressor Will Not Stage Up

Compressor Staging Intervals Too Short

Compressor Oil Level Too High Or Too Low

Motor Overload Relays or Circuit Breakers Open

Compressor Thermal Protection Switch Open

Warranty Registration Form (Scroll)

I. PRE START-UP PROCEDURE

II. Pre Start-Up Checklist

III. REFRIGERATION SYSTEM

V. START-UP

MICROTECH STATUS CHECK-Each Reading Must be Verified with Field Provided Instruments of Known Accuracy?

VI. MICROTECH SETPOINTS

MicroTech setpoints for various operational parameters.

Limited Product Warranty

DAIKIN APPLIED AMERICAS INC. LIMITED PRODUCT WARRANTY (North America)

Company's warranty terms for defective parts, labor, and exceptions.

PRODUCT STARTUP ON CENTRIFUGAL AND SCREW COMPRESSOR PRODUCTS IS MANDATORY

Daikin AGZ225E Specifications

General IconGeneral
BrandDaikin
ModelAGZ225E
CategoryChiller
LanguageEnglish

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