Daikin AGZ140E 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:

R
Russell WalkerAug 15, 2025
What causes motor overload relays or circuit breakers to open in my Daikin AGZ140E?
- B
  Brandy McdonaldAug 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
Brian BeardAug 22, 2025
Why is my Daikin AGZ140E Chiller's compressor noisy or vibrating?
- T
  Timothy HaynesAug 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.
R
Robert GeorgeAug 26, 2025
What causes high discharge pressure in my Daikin AGZ140E?
- K
  Karen StaffordAug 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.
J
Jonathan FerrellAug 31, 2025
What to do if my Daikin Chiller compressor will not stage up?
- R
  Reginald RodriguezAug 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.
K
Kristy OsborneSep 4, 2025
Why are the compressor staging intervals too short on my Daikin AGZ140E Chiller?
- J
  johnsontonySep 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).
M
Mrs. Samantha GravesSep 12, 2025
What causes the compressor thermal protection switch to open on my Daikin Chiller?
- R
  Ronald CaseSep 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 AGZ140E Specifications

General

Brand	Daikin
Model	AGZ140E
Category	Chiller
Language	English

Summary

Installation and Application Information

Operating and Standby Limits

Service Clearance

Spacing Requirements

Chilled Water Piping

Water Flow Limitations

Evaporator Freeze Protection

Low Ambient Operation

High Ambient Operation

Refrigerant Schematics

Refrigerant Charge

Electrical Data

Unit Controller Operation

Controller Inputs and Outputs

Set Points

Explanation of how set points are configured and adjusted via the controller.

Circuit Level Set Points

Set points that apply individually to each refrigerant circuit.

Security

Information on password protection and access levels for controller settings.

Sequence of Operation

Circuit Sequence of Operation

Unit Functions

Unit Capacity Control

How the unit adjusts its capacity based on load and conditions.

Compressor Staging in Cool Mode

Logic for starting and stopping compressors in cooling mode.

Freeze Protection

RapidRestore® Option

Details on the RapidRestore® feature for quick restart and loading.

Fast Loading

How the unit achieves full capacity faster during RapidRestore® operation.

Circuit Functions

Circuit Control Logic

Rules governing when a circuit can be enabled and compressors made available.

EXV Control

How the Electronic Expansion Valve (EXV) is controlled for superheat and pressure.

Superheat Target

How the suction superheat target is set based on compressor operation.

Low Evaporator Pressure

Conditions and actions related to low evaporator pressure events.

High Condenser Pressure

Conditions and actions related to high condenser pressure events.

Alarms

Unit Fault Alarms

Describes various fault conditions that can occur within the unit.

Evaporator Flow Loss

Trigger conditions and actions for evaporator flow loss alarms.

Evaporator Water Freeze Protect

Alarm triggered when evaporator LWT drops below the freeze protect set point.

Unit Problem Alarms

Alarms related to issues with pumps or other unit components.

Circuit Fault Alarms

Faults specific to individual refrigerant circuits.

Mechanical High Pressure Switch

Alarm triggered by the mechanical high pressure switch.

Using the Controller

Passwords

Procedures for entering and managing passwords for controller access.

Navigation Mode

Edit Mode

Optional Low Ambient Fan VFD

VFD Interface

Table 83: Types of Alarms, Faults, and Errors

Startup and Shutdown Procedures

Pre Startup

Initial checks and preparations required before chiller startup.

Startup

Steps to follow for safely starting the chiller unit.

Shutdown

Post Startup

Component Operation

Hot Gas Bypass (Optional)

Compressor Communications

Unit Maintenance

System Adjustment

Expansion Valve

R-410A Refrigerant

Refrigerant Charging

Troubleshooting Chart

Compressor Will Not Run

Low Suction Pressure

Motor Overload Relays or Circuit Breakers Open

Limited Product Warranty

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