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Daikin AGZ170E - User Manual

Daikin AGZ170E
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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
    Kimberly MooreAug 14, 2025
    What causes motor overload relays or circuit breakers to open in my Daikin AGZ170E?
    • P
      Peter FriedmanAug 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.
  • J
    Jerry JohnsonAug 20, 2025
    Why is my Daikin AGZ170E's compressor noisy or vibrating?
    • J
      James SantanaAug 20, 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
    Joseph HubbardAug 25, 2025
    What causes high discharge pressure in my Daikin AGZ170E Chiller?
    • T
      Tanya RoseAug 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
    Jason BauerAug 30, 2025
    What to do if my Daikin Chiller compressor will not stage up?
    • L
      Lisa Cline MDAug 30, 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
    Kevin Morrison Jr.Sep 3, 2025
    Why are the compressor staging intervals too short on my Daikin Chiller?
    • S
      Sean HarrisSep 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).
  • M
    Maureen GonzalezSep 9, 2025
    What causes the compressor thermal protection switch to open on my Daikin Chiller?
    • U
      ustewartSep 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.
  • C
    Christina SimmonsNov 16, 2025
    What to do if my Daikin AGZ170E Chiller compressor will not run?
    • C
      Carlos PerryNov 16, 2025
      If your Daikin Chiller compressor isn't running, there are several potential causes. First, ensure that the main or compressor disconnect switch is closed. Check for blown fuses or open circuit breakers, examining electrical circuits and motor windings for shorts or grounds. Also, check for loose or corroded connections, replacing fuses or resetting breakers after correcting any faults. Thermal overloads may have tripped; these are auto-resetting, so check voltages, cycle times, and mechanical operations, allowing time for the reset. A defective contactor or coil could also be the issue, requiring replacement. The system might be shut down by equipment protection devices; determine the cause and correct it before restarting. The unit may not require cooling, so wait until it calls for it. ...
  • S
    Stephen FaulknerNov 26, 2025
    How to fix low suction pressure in a Daikin AGZ170E Chiller?
    • J
      John FischerNov 26, 2025
      Low suction pressure in a Daikin Chiller can arise from various causes. Rapid load swings might be the culprit, requiring load stabilization. A lack of refrigerant could be the issue; check for leaks, repair them, and add refrigerant, also check the liquid sight glass. A fouled liquid line filter drier can cause this; check the pressure drop across it and replace if needed. An expansion valve malfunction may also be responsible; repair or replace it and adjust for proper superheat. Low condensing temperature can contribute; check the means for regulating condenser temperature. Other potential causes include compressors not staging properly (see corrective steps - Compressor Staging Intervals Too Low), insufficient water flow (correct the flow), excess or wrong oil used (recover or change t...

Summary

Installation, Operation, and Maintenance Manual

Installation and Application Information

Operating and Standby Limits

Defines operational and standby temperature and fluid limits.

Unit Placement

Guidelines for selecting and preparing the unit's installation location.

Service Clearance

Chilled Water Piping

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

Water Flow Limitations

Evaporator Freeze Protection

Details how the unit protects against evaporator freeze-up.

Chilled Water Pump

Flow Switch

High Ambient Operation

Refrigerant Charge

Electrical Data Notes

Electrical Control Center

Electrical Data

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

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

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

Table 17: 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)

Unit Controller Operation

General Description

Controller Inputs and Outputs

Lists and describes the controller's analog and digital inputs/outputs.

RapidRestore

Set Points

Explanation of set points and how they can be adjusted.

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

Detailed list of unit-level set points and their adjustable ranges.

Table 44: Design Conditions

Table 47: Commincation Configuration

Settings for network communication protocols like BACnet and Modbus.

Circuit Level Set Points

Set points specific to each refrigerant circuit.

Dynamic Set Point Ranges and Defaults

Security

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Flowchart detailing the unit's operation in cool mode.

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

Continuation of the cool mode operational sequence.

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

Further steps in the cool mode operational sequence.

Figure 50: Unit Sequence of Operation - Ice Mode

Flowchart detailing the unit's operation in ice mode.

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

Continuation of the ice mode operational sequence.

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

Further steps in the ice mode operational sequence.

Figure 53: Circuit Sequence of Operation

Flowchart detailing the operation of individual refrigerant circuits.

Unit Functions

Compressor Staging in Cool Mode

Rules for starting and stopping compressors in cool mode.

Staging Sequence

Logic for determining which compressor starts or stops next.

Unit Enable

How the chiller is enabled or disabled via set points and inputs.

Unit Mode Selection

Low Ambient Lockout

How low ambient temperature affects unit operation.

Unit Status

Evaporator Pump Control

Freeze Protection

How the unit protects the evaporator from freezing.

LWT Target

How the Leaving Water Temperature target is determined and adjusted.

Unit Capacity Control

Detailed explanation of unit capacity management.

Compressor Staging in Ice Mode

Rules for staging compressors in ice mode operation.

Demand Limit

Network Limit

High Ambient Limit

RapidRestore Option

Details on the RapidRestore® feature for faster restarts.

Fast Loading

Sound Reduction

Circuit Functions

Circuit Enabling

Compressor Availability

Circuit States

Compressor Control

How compressors are controlled based on circuit state.

Condenser Fan Control

Condenser Staging

Condenser Target

Staging Up

EXV Control

Control states and transitions for the electronic expansion valve.

Staging Down

VFD Control

Superheat Target

How the suction superheat target is set based on capacity.

Alarms

Unit Fault Alarms

Details of unit-level fault alarms, triggers, and resets.

Evaporator Flow Loss

Alarm for missing evaporator flow, including triggers and reset.

Evaporator Water Freeze Protect

Alarm for evaporator freezing conditions.

Unit Problem Alarms

Circuit Fault Alarms

Faults specific to individual refrigerant circuits.

Low Evaporator Pressure

Alarm for low evaporator pressure conditions.

High Condenser Pressure

Alarm for high condenser pressure conditions.

Low Evaporator Pressure - Unload

Using the Controller

Figure 61: Schematic of Unit Controller

Navigating

How to navigate through the controller menus using the wheel and buttons.

Passwords

Procedures for entering and managing passwords for controller access.

Navigation Mode

Edit Mode

How to enter edit mode and change parameter values.

Optional Low Ambient Fan VFD

Inverter Output to the Motor

Table 81: Alarm Content

Table 83: Types of Alarms, Faults, and Errors

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

Table 84: Fault Reset Methods

Optional BAS Interface

Information on integrating the chiller with Building Automation Systems.

Startup and Shutdown Procedures

Pre Startup

Initial checks and procedures before starting the chiller.

Pre-Startup Water Piping Checkout

Steps for checking the chilled water piping system before startup.

Pre-Startup Electrical Check Out

Electrical checks required before starting the unit.

Startup

Steps for initiating chiller operation after pre-startup checks.

Shutdown

Procedures for temporarily and permanently shutting down the chiller.

Component Operation

Hot Gas Bypass (Optional)

VFD Low Ambient Control (Optional)

Compressor Communications

Evaporator

Unit Maintenance

General

Compressor Maintenance

Filter-Driers

System Adjustment

Expansion Valve

Table 88: Planned Maintenance Schedule

Schedule for weekly, monthly, and annual maintenance tasks.

R-410 A Refrigerant

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

POE Lubricants

Information on POE oils used for compressor lubrication and handling precautions.

Refrigerant Charging

Procedures for recharging the unit with R-410A refrigerant.

Troubleshooting Chart

Compressor Will Not Run

Identifies causes and corrective steps for compressor failure to run.

Compressor Noisy Or Vibrating

Troubleshooting steps for noisy or vibrating compressors.

High Discharge Pressure

Identifies causes and corrective steps for high discharge pressure.

Low Suction Pressure

Troubleshooting steps for low suction pressure issues.

Compressor Staging Intervals Too Short

Compressor Thermal Protection Switch Open

Troubleshooting steps for thermal protection trips.

Warranty Registration Form (Scroll)

II. Pre Start-Up Checklist

Checklist for pre-startup verification before operation.

V. START-UP

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

Verification of MicroTech readings against field instruments.

Limited Product Warranty

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

Official warranty statement from Daikin Applied.

EXCEPTIONS

Daikin AGZ170E Specifications

General IconGeneral
BrandDaikin
ModelAGZ170E
CategoryChiller
LanguageEnglish

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