Daikin AGZ080E User Manual (English)

Questions and Answers:

T
trevor64Aug 14, 2025
What causes motor overload relays or circuit breakers to open in my Daikin Chiller?
- N
  Nicholas ParksAug 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.
A
Amy WarrenAug 21, 2025
Why is my Daikin Chiller's compressor noisy or vibrating?
- C
  Christopher PerryAug 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
James GoodwinAug 25, 2025
What causes high discharge pressure in my Daikin AGZ080E?
- J
  Jamie BrowningAug 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.
J
John MaddenAug 31, 2025
What to do if my Daikin AGZ080E Chiller compressor will not stage up?
- D
  Darryl VargasAug 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
John EdwardsSep 3, 2025
Why are the compressor staging intervals too short on my Daikin Chiller?
- J
  Jennifer JohnsonSep 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).
B
brandy31Sep 9, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ080E?
- N
  nelsonbethSep 9, 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 AGZ080E Specifications

General

Brand	Daikin
Model	AGZ080E
Category	Chiller
Language	English

Summary

Pre-Start Checklist

Pre Start-Up Checklist

Checklist for critical pre-start-up items to ensure proper installation and readiness.

Installation and Application Information

Operating and Standby Limits

Table detailing maximum and minimum operating ambient and fluid temperatures.

Service Clearance

Spacing Requirements

Chilled Water Piping

Requirements for installing chilled water piping, including strainers and flow switches.

Water Flow Limitations

Information on evaporator flow rates, pressure drops, and their impact on performance.

Evaporator Freeze Protection

Methods and components used to protect the evaporator from freezing.

Refrigerant Schematics

Electrical Data

Electrical Data Notes

Important notes regarding power wiring, sizing, and connections.

Voltage Limitations

Panel High Short Circuit Current Rating

Figure 44: Typical Field Wiring Diagram (Single-Point Connection)

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

Unit Controller Operation

General Description

Overview of the MicroTech III controller's capabilities for efficiency and troubleshooting.

Controller Inputs and Outputs

Detailed tables of analog and digital inputs and outputs for the main controller.

RapidRestore®

Description of the RapidRestore feature for faster unit restart and loading.

Set Points

Explanation of how to adjust and manage unit set points via the controller.

Circuit Level Set Points

Set points specific to individual refrigerant circuits.

Special Set Point Operation

Security

Information on password protection for accessing and changing set points.

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Diagram illustrating the chiller's sequence of operation in Cool Mode.

Figure 50: Unit Sequence of Operation - Ice Mode

Diagram illustrating the chiller's sequence of operation in Ice Mode.

Unit Functions

Unit Capacity Control

Control of unit capacity through compressor staging and delays.

Unit Enable

Freeze Protection

Measures to protect the evaporator and components from freezing.

LWT Target

Evaporator Pump Control

RapidRestore® Option

Sound Reduction

Circuit Functions

Circuit Control Logic

Pumpdown Procedure

Low Ambient Starts

Compressor Control

Condenser Fan Control

Condenser Staging

Condenser Target

VFD Control

EXV Control

Control logic and states for the Electronic Expansion Valve (EXV).

Low Evaporator Pressure

High Condenser Pressure

Alarms

Unit Fault Alarms

Details on fault alarms such as PVM/GFP and evaporator issues.

Unit Problem Alarms

Unit Warning Alarms

Circuit Fault Alarms

Faults specific to refrigerant circuits, including pressure and sensor issues.

Low Evaporator Pressure - Hold

High Condenser Pressure - Unload

Using the Controller

Navigating

Passwords

Procedure for entering passwords to access different parameter levels.

Edit Mode

Optional Low Ambient Fan VFD

Description of the VFD control for low ambient operation below 32°F (0°C).

Optional BAS Interface

Startup and Shutdown Procedures

Pre Startup

Initial inspection and checks required before chiller startup.

Pre-Startup Water Piping Checkout

Pre-Startup Electrical Check Out

Electrical checks, including power wiring, control wiring, and voltage verification.

Startup

Procedure for starting the chiller, including setpoint verification.

Post Startup

Shutdown

Procedures for temporarily and extendedly shutting down the chiller.

Component Operation

Hot Gas Bypass (Optional)

Compressor Communications

Unit Maintenance

Compressor Maintenance

Cleaning Microchannel Aluminum Coils

Routine Quarterly Cleaning of ElectroFin Coated Coil Surfaces

Filter-Driers

System Adjustment

R-410A Refrigerant

Terminology, safety precautions, and handling procedures for R-410A refrigerant.

POE Lubricants

Troubleshooting Chart

Compressor Will Not Run

Troubleshooting steps for a compressor that will not start.

Compressor Noisy Or Vibrating

High Discharge Pressure

Troubleshooting steps for issues related to high discharge pressure.

Low Suction Pressure

Troubleshooting steps for issues related to low suction pressure.

Compressor Thermal Protection Switch Open

Troubleshooting causes for the compressor thermal protection switch tripping.

Warranty Registration Form (Scroll)

II. Pre Start-Up Checklist

A comprehensive checklist to verify pre-start-up conditions.

III. REFRIGERATION SYSTEM

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

Verification of MicroTech status readings against field instruments.

Limited Product Warranty

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

Details of the limited product warranty for North American products.

EXCEPTIONS

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Daikin AGZ080E User Manual

Table of Contents

Questions and Answers:

Daikin AGZ080E Specifications

Summary

Pre-Start Checklist

Pre Start-Up Checklist

Installation and Application Information

Operating and Standby Limits

Service Clearance

Spacing Requirements

Chilled Water Piping

Water Flow Limitations

Evaporator Freeze Protection

Refrigerant Schematics

Electrical Data

Electrical Data Notes

Voltage Limitations

Panel High Short Circuit Current Rating

Figure 44: Typical Field Wiring Diagram (Single-Point Connection)

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

Unit Controller Operation

General Description

Controller Inputs and Outputs

RapidRestore®

Set Points

Circuit Level Set Points

Special Set Point Operation

Security

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Figure 50: Unit Sequence of Operation - Ice Mode

Unit Functions

Unit Capacity Control

Unit Enable

Freeze Protection

LWT Target

Evaporator Pump Control

RapidRestore® Option

Sound Reduction

Circuit Functions

Circuit Control Logic

Pumpdown Procedure

Low Ambient Starts

Compressor Control

Condenser Fan Control

Condenser Staging

Condenser Target

VFD Control

EXV Control

Low Evaporator Pressure

High Condenser Pressure

Alarms

Unit Fault Alarms

Unit Problem Alarms

Unit Warning Alarms

Circuit Fault Alarms

Low Evaporator Pressure - Hold

High Condenser Pressure - Unload

Using the Controller

Navigating

Passwords

Edit Mode

Optional Low Ambient Fan VFD

Optional Low Ambient Fan VFD

Optional BAS Interface

Startup and Shutdown Procedures

Pre Startup

Pre-Startup Water Piping Checkout

Pre-Startup Electrical Check Out

Startup

Post Startup

Shutdown

Component Operation

Hot Gas Bypass (Optional)

Compressor Communications

Unit Maintenance

Compressor Maintenance

Cleaning Microchannel Aluminum Coils

Routine Quarterly Cleaning of ElectroFin Coated Coil Surfaces