Daikin AGZ090E User Manual

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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:

K
Katherine CooperAug 15, 2025
What causes motor overload relays or circuit breakers to open in my Daikin Chiller?
- J
  Joseph ClayAug 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
Amy NelsonAug 21, 2025
Why is my Daikin AGZ090E Chiller's compressor noisy or vibrating?
- S
  Stephen RiveraAug 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
deborahgarrettAug 25, 2025
What causes high discharge pressure in my Daikin AGZ090E?
- B
  bmillerAug 26, 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.
P
Phillip RichardsonAug 31, 2025
What to do if my Daikin Chiller compressor will not stage up?
- S
  sheila25Aug 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.
C
Christine LevySep 3, 2025
Why are the compressor staging intervals too short on my Daikin AGZ090E Chiller?
- E
  Emily GarciaSep 3, 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).
E
Eugene EvansSep 10, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ090E Chiller?
- M
  Morgan SolisSep 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.

Daikin AGZ090E Specifications

General

Brand	Daikin
Model	AGZ090E
Category	Chiller
Language	English

Summary

Installation and Application Information

Operating and Standby Limits

Details the temperature and pressure limits for unit operation and standby.

Chilled Water Piping and Flow

Evaporator Freeze Protection

Outlines measures to prevent evaporator damage from freezing.

Electrical Data

Panel Ratings and Power Connections

Details safety ratings and connection requirements for the electrical panel.

Unit Controller Operation

Controller Overview and Set Points

Controller Inputs, Outputs, and Configuration

Sequence of Operation

Cool Mode Sequence

Illustrates the step-by-step process for the chiller's operation in cool mode.

Ice Mode Sequence

Unit Functions

Unit Capacity Control and Staging

Freeze Protection and LWT Target

Circuit Functions

EXV Control

Alarms

Unit and Circuit Faults

Lists and describes specific faults impacting unit or circuit operation.

Optional Low Ambient Fan VFD

VFD Operation and Interface

VFD Alarms and Errors

Startup and Shutdown Procedures

Pre Startup Checks

Steps to verify system readiness before unit startup.

Startup and Shutdown Processes

Procedures for safe unit startup, operation, and shutdown.

Unit Maintenance

General Maintenance and Compressor

Coil Cleaning and Filter-Driers

Troubleshooting Chart

Compressor Issues

Identifies common problems and corrective steps for compressor operation.

Warranty Registration Form (Scroll)

II. Pre Start-Up Checklist

Limited Product Warranty

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