Daikin AGZ065E 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:

C
Casey CunninghamAug 15, 2025
What causes motor overload relays or circuit breakers to open in my Daikin AGZ065E Chiller?
- S
  sscottAug 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.
B
Bryan CarpenterAug 21, 2025
Why is my Daikin AGZ065E Chiller's compressor noisy or vibrating?
- C
  christophernewtonAug 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.
S
stacy99Aug 25, 2025
What causes high discharge pressure in my Daikin AGZ065E?
- R
  Ryan YoungAug 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.
K
Kristin MurphySep 1, 2025
What to do if my Daikin AGZ065E Chiller compressor will not stage up?
- J
  Jeffery LoveSep 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.
M
Matthew NelsonSep 4, 2025
Why are the compressor staging intervals too short on my Daikin Chiller?
- L
  Linda RiosSep 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).
P
phuynhSep 12, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ065E Chiller?
- M
  Michelle BatesSep 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 AGZ065E Specifications

General

Brand	Daikin
Model	AGZ065E
Category	Chiller
Language	English

Summary

Refrigerant Charge

Table 6: Refrigerant Charge - Microchannel Units

Lists the factory-specified R-410A refrigerant charge for microchannel units.

Electrical Data

Electrical Data Notes

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

Illustrates the wiring schematic for single-point power connections.

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

Unit Controller Operation

General Description

Controller Inputs and Outputs

Lists and defines the analog and digital signals managed by the controller.

Set Points

Explains the purpose and adjustment of various unit-level set points for operation.

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Flowchart detailing the chiller's operational steps during cooling.

Figure 50: Unit Sequence of Operation - Ice Mode

Flowchart illustrating the chiller's sequence for ice mode operation.

Figure 53: Circuit Sequence of Operation

Alarms

Unit Fault Alarms

Identifies critical unit-level alarms, their triggers, and reset procedures.

Circuit Fault Alarms

Lists and describes alarms specific to individual refrigerant circuits.

Low Evaporator Pressure

Details the causes and actions for low evaporator pressure alarms.

Optional Low Ambient Fan VFD

Optional Low Ambient Fan VFD

Overview of variable frequency drive control for low ambient operation.

VFD Interface

Startup and Shutdown Procedures

Pre Startup

Comprehensive pre-startup checklist and procedures before unit commissioning.

Startup

Step-by-step instructions for safely starting the chiller unit.

Shutdown

Procedures for performing temporary and extended unit shutdowns.

Unit Maintenance

General

Outlines routine service checks and general maintenance tasks.

Filter-Driers

R-410A Refrigerant

Key terminology, safety precautions, and handling guidelines for R-410A refrigerant.

Table 88: Planned Maintenance Schedule

A structured schedule for weekly, monthly, and annual maintenance activities.

Troubleshooting Chart

Compressor Will Not Run

Lists common causes and corrective steps for compressor startup failures.

High Discharge Pressure

Identifies potential causes and solutions for high discharge pressure issues.

Low Suction Pressure

Details common causes and corrective actions for low suction pressure.

Compressor Thermal Protection Switch Open

Addresses causes and corrections for thermal protection switch trips.

Warranty Registration Form (Scroll)

I. PRE START-UP PROCEDURE

Pre-startup checks required for warranty registration and compliance.

II. Pre Start-Up Checklist

III. REFRIGERATION SYSTEM

VI. MICROTECH SETPOINTS

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