Daikin AGZ161E User Manual (English)

Questions and Answers:

J
James FranklinAug 14, 2025
What causes motor overload relays or circuit breakers to open in my Daikin AGZ161E Chiller?
- L
  Laura YoungAug 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.
S
Stephanie CampbellAug 21, 2025
Why is my Daikin Chiller's compressor noisy or vibrating?
- R
  Ryan TaylorAug 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.
R
Randy HickmanAug 25, 2025
What causes high discharge pressure in my Daikin AGZ161E Chiller?
- G
  Gregg TorresAug 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.
K
Kelly JohnsonAug 31, 2025
What to do if my Daikin Chiller compressor will not stage up?
- M
  Miss Stephanie GardnerAug 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.
S
Steven CookSep 3, 2025
Why are the compressor staging intervals too short on my Daikin AGZ161E?
- A
  Andrew GriffinSep 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).
D
Douglas CummingsSep 10, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ161E?
- B
  Betty MartinezSep 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 AGZ161E Specifications

General

Brand	Daikin
Model	AGZ161E
Category	Chiller
Language	English

Summary

Installation and Application Information

Operating and Standby Limits

Table detailing the maximum and minimum operating and standby ambient and fluid temperatures.

Chilled Water Piping

Requirements for field-installed water piping, including strainers and flow switches.

Water Flow Limitations

Explains constant and variable evaporator flow rates and their impact on pressure drop.

Low Ambient Operation

How the unit operates in low ambient temperatures, including VFD options.

High Ambient Operation

Requirements for operating the unit in high ambient temperatures, including optional packages.

Evaporator Freeze Protection

Details on how the unit protects the evaporator from freezing using heaters and glycol.

Refrigerant Charge

Table 6: Refrigerant Charge - Microchannel Units

Table listing refrigerant charge amounts for various microchannel unit models.

Pressure Drop Data

Table 11: Pressure Drop Data

Table showing pressure drop values for different flow rates and unit models.

Electrical Data

Electrical Data Notes

Important notes regarding power wiring, sizing, and grounding for electrical connections.

Electrical Data

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

Electrical specifications for single-point connections across various voltages.

Table 16: Electrical Data - Single Point (60/50 Hz)

Single-point electrical data for larger unit models.

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

Electrical data for multiple-point connections, circuit 1.

Table 19: Electrical Data - Multiple Point (60/50 Hz)

Electrical data for multiple-point connections, circuit 2.

Table 20: Electrical Data - Multiple Point (60/50 Hz)

Multiple-point electrical data for various models.

Table 21: Electrical Data - Multiple Point (60/50 Hz)

Continuation of multiple-point electrical data.

Table 15: Electrical Data - Single Point (60/50 Hz)

Continuation of single-point electrical data for different models.

Table 17: Electrical Data - Single Point (60/50 Hz)

Electrical data for single-point connections, continuing from previous page.

Unit Controller Operation

General Description

Overview of the MicroTech® III controller's functionality and benefits.

Controller Inputs and Outputs

Lists and explains analog and digital inputs/outputs for the main controller.

RapidRestore®

Describes the RapidRestore® option for faster chiller restarts and loading.

Table 39: Unit Level Set Point Defaults and Ranges (continued)

Continuation of unit-level set point defaults and ranges.

Security

Information on password protection for accessing and changing set points.

Unit Controller Operation

Set Points

Explanation of how set points are adjusted and stored in the controller.

Table 47: Commincation Configuration

Configuration settings for network communication protocols like BACnet and Modbus.

Circuit Level Set Points

Explains that settings in this section apply to individual circuits.

Table 38: Unit Level Set Point Defaults and Ranges

Default and adjustable ranges for unit-level set points.

Table 48: Set Points for Individual Circuits

Default and adjustable ranges for circuit-specific set points.

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Flowchart illustrating the chiller's operational sequence in cool mode.

Figure 48: Unit Sequence of Operation - Cool Mode (continue)

Continuation of the operational sequence flowchart for cool mode.

Figure 49: Unit Sequence of Operation - Cool Mode (continued)

Final part of the operational sequence flowchart for cool mode.

Figure 50: Unit Sequence of Operation - Ice Mode

Flowchart detailing the chiller's sequence of operation in ice mode.

Figure 51: Unit Sequence of Operation - Ice Mode (continued)

Continuation of the operational sequence flowchart for ice mode.

Figure 52: Unit Sequence of Operation - Ice Mode (continued)

Final part of the operational sequence flowchart for ice mode.

Figure 53: Circuit Sequence of Operation

Flowchart detailing the sequence of operation for individual refrigerant circuits.

Unit Functions

Unit Capacity Control

Overview of unit capacity control methods.

Freeze Protection

Conditions for starting and ending evaporator freeze protection.

Unit Status

Table defining unit status based on various operating conditions.

RapidRestore® Option

Description of the RapidRestore® option for faster restarts and loading.

Compressor Staging in Cool Mode

Logic for compressor staging in cool mode.

Unit Enable

Conditions and tables for enabling or disabling the chiller via various inputs and set points.

Evaporator Pump Control

Defines the three control states for evaporator pumps: Off, Start, Run.

Unit Mode Selection

How unit operating modes (cool, ice) are determined by set points and inputs.

Compressor Staging in Ice Mode

Compressor staging logic for ice mode.

LWT Target

How the LWT Target varies based on settings and inputs.

Fast Loading

How the unit achieves full capacity faster when RapidRestore® is active.

Unit States

Describes the three possible states of the unit: Off, Auto, and Pumpdown.

Staging Sequence

Rules for compressor staging to balance starts and run hours.

Circuit Functions

Calculations

Formulas for refrigerant saturated temperature, evaporator approach, condenser approach, suction superheat, and pumpdown pressure.

Condenser Target

How the condenser target is selected based on circuit capacity and temperature.

Circuit Control Logic

Conditions for enabling a circuit and compressor availability.

Staging Up

Logic for condenser fan staging up based on pressure and temperature.

Staging Down

Logic for condenser fan staging down based on temperature and deadbands.

VFD Control

How VFDs control fan speed to maintain condenser temperature targets.

EXV Control

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

Circuit States

The four possible states of a circuit: Off, Preopen, Run, Pumpdown.

Superheat Control State Operation

How the EXV controls suction superheat using a PID loop.

Capacity Overrides – Limits of Operation

Conditions that override automatic capacity control to prevent unsafe operation.

Low Ambient Starts

How low ambient temperature conditions affect compressor starting and alarms.

Superheat Target

How the suction superheat target is selected based on circuit capacity.

Circuit Status

Table defining circuit status based on various conditions.

Compressor Control

General rules for compressor operation within a circuit state.

Circuit Functions

Condenser Fan Control

How condenser fans are staged based on compressor operation and temperature.

Alarms

Unit Fault Alarms

Lists and describes unit-level fault alarms and their triggers.

EXV Module 2 Comm Failure

Alarm details for EXV module 2 communication failure.

Mechanical High Pressure Switch

Trigger, action, and reset for mechanical high pressure switch faults.

Low Evaporator Pressure - Hold

Event triggered when evaporator pressure is low and circuit is in Run state.

Unit Problem Alarms

Lists and describes unit problem alarms like pump failures.

Motor Protection Fault

Trigger, action, and reset for motor protection faults.

Low Evaporator Pressure - Unload

Event triggered when evaporator pressure is low and multiple compressors are running.

Evaporator Flow Loss

Details on evaporator flow loss alarms, including triggers and reset conditions.

Low OAT Restart Fault

Trigger, action, and reset for low OAT restart faults.

High Condenser Pressure - Unload

Event triggered when condenser pressure is high and multiple compressors are running.

Evaporator Water Freeze Protect

Alarm conditions and actions for evaporator water freeze protection.

No Pressure Change After Start

Alarm for lack of pressure change after compressor start.

Evaporator LWT Sensor Fault

Trigger, action, and reset for evaporator LWT sensor faults.

Evaporator Pressure Sensor Fault

Trigger, action, and reset for evaporator pressure sensor faults.

Outdoor Air Temperature Sensor Fault

Trigger, action, and reset for OAT sensor faults.

Condenser Pressure Sensor Fault

Trigger, action, and reset for condenser pressure sensor faults.

Suction Temperature Sensor Fault

Trigger, action, and reset for suction temperature sensor faults.

Compressor Module 1 Comm Failure

Alarm details for communication failure with compressor module 1.

Compressor Module 2 Comm Failure

Alarm details for communication failure with compressor module 2.

Evaporator EWT Sensor Fault

Trigger, action, and reset for evaporator EWT sensor faults.

EXV Module 1 Comm Failure

Alarm details for EXV module 1 communication failure.

Circuit Fault Alarms

Lists and describes circuit-level fault alarms.

PVM/GFP Fault

Trigger, action, and reset for PVM/GFP faults in multi-point configurations.

Low Evaporator Pressure

Event triggering conditions for low evaporator pressure.

High Condenser Pressure

Event triggering conditions for high condenser pressure.

Using the Controller

Navigating

How to navigate the controller menus using the keypad and wheel.

Using the Controller

Passwords

How to enter passwords to access different levels of controller parameters.

Optional Low Ambient Fan VFD

Details on the VFD fan control for low ambient temperature operation.

Table 83: Types of Alarms, Faults, and Errors

Categorizes VFD alarms, faults, and errors and their responses.

Startup and Shutdown Procedures

Pre Startup

General inspection and checklist completion before starting the unit.

Pre-Startup Water Piping Checkout

Steps for checking and preparing the water piping system.

Pre-Startup Electrical Check Out

Electrical checks and procedures required before unit startup.

Shutdown

Procedures for temporary and extended unit shutdowns.

Startup

Initial steps for starting the chiller, including controller setup and load verification.

Component Operation

VFD Low Ambient Control (Optional)

Compressor Communications

Evaporator

Unit Maintenance

R-410A Refrigerant

Refrigerant Charging

Charging procedure

Safety

System Adjustment

POE Lubricants

Liquid Line Sight Glass

Expansion Valve

Troubleshooting Chart

Compressor Will Not Run

Possible causes and corrective steps for a compressor that will not run.

Compressor Will Not Stage Up

Causes and corrective steps for compressors failing to stage up.

Compressor Noisy Or Vibrating

Causes and solutions for noisy or vibrating compressors.

Compressor Staging Intervals Too Short

Causes and corrective steps for compressor staging intervals being too short.

High Discharge Pressure

Causes and corrective actions for high discharge pressure issues.

Compressor Oil Level Too High Or Too Low

Causes and corrective steps for incorrect compressor oil levels.

Low Suction Pressure

Possible causes and solutions for low suction pressure problems.

Motor Overload Relays or Circuit Breakers Open

Causes and corrective steps for motor overload relays or circuit breakers opening.

Compressor Thermal Protection Switch Open

Causes and corrective steps for compressor thermal protection switches opening.

Warranty Registration Form (Scroll)

II . Pre Start-Up Checklist

Limited Product Warranty

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

Company's limited product warranty terms and conditions for North America.

PRODUCT STARTUP ON CENTRIFUGAL AND SCREW COMPRESSOR PRODUCTS IS MANDATORY

SOLE REMEDY

States that the warranty is the owner's sole remedy, disclaiming other warranties and damages.

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Daikin AGZ161E User Manual

Table of Contents

Questions and Answers:

Daikin AGZ161E Specifications

Summary

Installation and Application Information

Operating and Standby Limits

Chilled Water Piping

Water Flow Limitations

Low Ambient Operation

High Ambient Operation

Evaporator Freeze Protection

Refrigerant Charge

Table 6: Refrigerant Charge - Microchannel Units

Pressure Drop Data

Table 11: Pressure Drop Data

Electrical Data

Electrical Data Notes

Electrical Data

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

Table 16: Electrical Data - Single Point (60/50 Hz)

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

Table 19: Electrical Data - Multiple Point (60/50 Hz)

Table 20: Electrical Data - Multiple Point (60/50 Hz)

Table 21: Electrical Data - Multiple Point (60/50 Hz)

Table 15: Electrical Data - Single Point (60/50 Hz)

Table 17: Electrical Data - Single Point (60/50 Hz)

Unit Controller Operation

General Description

Controller Inputs and Outputs

RapidRestore®

Table 39: Unit Level Set Point Defaults and Ranges (continued)

Security

Unit Controller Operation

Set Points

Table 47: Commincation Configuration

Circuit Level Set Points

Table 38: Unit Level Set Point Defaults and Ranges

Table 48: Set Points for Individual Circuits

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Figure 48: Unit Sequence of Operation - Cool Mode (continue)

Figure 49: Unit Sequence of Operation - Cool Mode (continued)

Figure 50: Unit Sequence of Operation - Ice Mode

Figure 51: Unit Sequence of Operation - Ice Mode (continued)

Figure 52: Unit Sequence of Operation - Ice Mode (continued)

Figure 53: Circuit Sequence of Operation

Unit Functions

Unit Capacity Control

Freeze Protection

Unit Status

RapidRestore® Option

Compressor Staging in Cool Mode

Unit Enable

Evaporator Pump Control

Unit Mode Selection

Compressor Staging in Ice Mode

LWT Target

Fast Loading

Unit States

Staging Sequence

Circuit Functions

Calculations

Condenser Target

Circuit Control Logic

Staging Up

Staging Down

VFD Control

EXV Control

Circuit States

Superheat Control State Operation

Capacity Overrides – Limits of Operation

Low Ambient Starts

Superheat Target

Circuit Status

Compressor Control

Circuit Functions

Condenser Fan Control

Alarms

Unit Fault Alarms