Daikin AGZ180E 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
kristenhowardAug 15, 2025
What causes motor overload relays or circuit breakers to open in my Daikin AGZ180E?
- T
  Travis MoralesAug 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.
R
Rebecca HallAug 22, 2025
Why is my Daikin AGZ180E Chiller's compressor noisy or vibrating?
- C
  chelseamaxwellAug 22, 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
Julie GreenAug 26, 2025
What causes high discharge pressure in my Daikin AGZ180E Chiller?
- J
  Jennifer MillerAug 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.
E
Elizabeth RodriguezAug 31, 2025
What to do if my Daikin AGZ180E Chiller compressor will not stage up?
- R
  Randy CopelandSep 1, 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
Justin Baker PhDSep 4, 2025
Why are the compressor staging intervals too short on my Daikin Chiller?
- D
  Debra RobertsSep 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).
L
Laurie SandersSep 12, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ180E Chiller?
- D
  Dave CarrilloSep 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 AGZ180E Specifications

General

Brand	Daikin
Model	AGZ180E
Category	Chiller
Language	English

Summary

Pre-Start Checklist

Chilled Water

Electrical

Miscellaneous

Installation and Application Information

General Description

Operating and Standby Limits

Defines key operational parameters and limits for the chiller.

Unit Placement

Service Clearance

Required spacing for maintenance access and proper airflow.

Chilled Water Piping

Requirements for installing chilled water system piping, including strainers.

Evaporator Freeze Protection

Methods and features to prevent evaporator freezing.

Condenser Coil Options and Coating Considerations

Details on available condenser coil types and protective coatings.

Refrigerant Charge

Electrical Data

Electrical Data Notes

Panel High Short Circuit Current Rating

Electrical Control Center

Power Connections

Unit Controller Operation

General Description

Overview of the MicroTech III controller and its features.

System Architecture

Describes the system's control structure and components.

Controller Inputs and Outputs

Details the controller's input and output points.

Set Points

Explanation of adjustable set points and their ranges.

Security

Information on password protection and access levels.

Sequence of Operation

Unit Sequence of Operation - Cool Mode

Unit Sequence of Operation - Ice Mode

Unit Functions

Unit Capacity Control

How unit capacity is managed through staging.

Freeze Protection

Measures to prevent evaporator freezing.

LWT Target

How the leaving water temperature target is set.

RapidRestore® Option

Details on the RapidRestore® feature for faster restarts.

Sound Reduction

Mode for reducing sound levels by limiting fan speeds.

Circuit Functions

Calculations

Circuit Control Logic

Logic governing circuit enabling and compressor availability.

Circuit States

Condenser Target

EXV Control

Control logic for the electronic expansion valve.

Alarms

Unit Fault Alarms

Details unit-level fault conditions and required actions.

Alarm Logs

Unit Problem Alarms

Specific problem alarms related to unit components.

Circuit Fault Alarms

Fault conditions specific to individual refrigerant circuits.

Unit Maintenance

General

Compressor Maintenance

Cleaning Microchannel Aluminum Coils

Periodic Clean Water Rinse

Filter-Driers

System Adjustment

Troubleshooting Chart

Compressor Will Not Run

Troubleshooting steps for a compressor that will not run.

Compressor Noisy Or Vibrating

High Discharge Pressure

Low Suction Pressure

Compressor Staging Intervals Too Short

Compressor Oil Level Too High Or Too Low

Limited Product Warranty

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

EXCEPTIONS

SOLE REMEDY

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