Daikin AGZ100E 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:

E
Eric RobbinsAug 14, 2025
What causes motor overload relays or circuit breakers to open in my Daikin Chiller?
- B
  boydteresaAug 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.
K
Katherine McmahonAug 21, 2025
Why is my Daikin Chiller's compressor noisy or vibrating?
- S
  Stephanie VillegasAug 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.
H
hryanAug 25, 2025
What causes high discharge pressure in my Daikin Chiller?
- W
  William KirbyAug 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.
S
steven12Aug 30, 2025
What to do if my Daikin AGZ100E Chiller compressor will not stage up?
- D
  Douglas BakerAug 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.
J
Joshua DavidsonSep 3, 2025
Why are the compressor staging intervals too short on my Daikin AGZ100E?
- N
  Nicole HuntSep 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).
G
Gordon NicholsSep 10, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ100E?
- L
  Larry RoblesSep 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.

Daikin AGZ100E Specifications

General

Brand	Daikin
Model	AGZ100E
Category	Chiller
Language	English

Summary

Installation, Operation, and Maintenance Manual

Trailblazer™ Air-Cooled Scroll Chillers

Overview of the air-cooled scroll chiller product line.

Installation and Application Information

Operating and Standby Limits

Specifies the acceptable operating temperature and fluid limits for the chiller.

Unit Placement and Service Clearance

Guidelines for installing the unit and required clearances for operation and service.

Chilled Water Piping Requirements

Guidelines for installing inlet strainers, flow switches, and proper piping support.

Water Flow and System Considerations

Unit Controller Operation

Controller Inputs, Outputs, and Modules

Details on analog/digital inputs/outputs and EXV modules.

Set Points and Configuration

Explanation of unit and circuit level set points and configuration parameters.

Passwords, Navigation, and Editing

Sequence of Operation

Unit Sequence of Operation (Cool Mode)

Unit Sequence of Operation (Ice Mode)

Circuit Sequence of Operation

Detailed operational sequence for individual refrigerant circuits.

Unit Functions

Unit Capacity Calculations and Control Band

Compressor Staging and Special Operations

Details on compressor staging, delays, overrides, demand limit, and special operations.

Sound Reduction and High Ambient Limits

Information on sound reduction modes, high ambient operation, and RapidRestore®.

Circuit Functions

Circuit Calculations and Control Logic

Condenser Fan and Staging Control

EXV Control and Operation Limits

Details on EXV control states, superheat targets, position commands, and operational limits.

Alarms

Unit and Circuit Fault Alarms

Using the Controller

Unit Controller Interface and Navigation

Passwords, Editing, and Access Levels

Details on password protection, editing setpoints, and screen access levels.

Optional Low Ambient Fan VFD

VFD Operation and Components

Explains the function of VFDs, inverters, and motor output connections.

VFD Interface, Data, and Alarms

Startup and Shutdown Procedures

Pre-Startup Checks and Startup Steps

Shutdown Procedures

Instructions for temporary, extended shutdowns, and post-startup checks.

Component Operation

Optional Component Operations

Compressor Communications and Warnings

Unit Maintenance

General Maintenance and Coil Cleaning

Filter-Driers, Battery, and Solenoid Valve

R-410A Refrigerant Handling and Safety

System Adjustment and Expansion Valve

Guidance on system adjustment for superheat/subcooling and expansion valve function.

Troubleshooting Chart

Compressor Troubleshooting

Warranty Registration and Limited Product Warranty

Pre Start-Up Checklist

Refrigeration System and Design Controls

Start-Up and Microtech Status

Limited Product Warranty Details

Explains warranty coverage, exceptions, assistance, and sole remedy provisions.

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