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Daikin AGZ190E - User Manual

Daikin AGZ190E
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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

  • T
    Terri BairdAug 14, 2025
    What causes motor overload relays or circuit breakers to open in my Daikin AGZ190E Chiller?
    • K
      Kevin EdwardsAug 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.
  • B
    Brittany AustinAug 21, 2025
    Why is my Daikin AGZ190E's compressor noisy or vibrating?
    • M
      Melissa RamirezAug 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
    Rodney PorterAug 25, 2025
    What causes high discharge pressure in my Daikin AGZ190E Chiller?
    • M
      Michele ChavezAug 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.
  • M
    Mr. Ryan RobinsonAug 31, 2025
    What to do if my Daikin AGZ190E compressor will not stage up?
    • K
      Kimberly DunnAug 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
    Kathleen SimsSep 3, 2025
    Why are the compressor staging intervals too short on my Daikin AGZ190E Chiller?
    • T
      Tiffany MorrisonSep 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).
  • W
    walterandrewSep 10, 2025
    What causes the compressor thermal protection switch to open on my Daikin AGZ190E Chiller?
    • J
      Jason MillerSep 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.
  • J
    Jason NguyenNov 17, 2025
    What to do if my Daikin AGZ190E Chiller compressor will not run?
    • A
      adam48Nov 17, 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. ...
  • M
    Martin RodriguezNov 26, 2025
    How to fix low suction pressure in a Daikin AGZ190E?
    • C
      clarkmelanieNov 27, 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

Trailblazer Air-Cooled Scroll Chillers

Product title and model series identifier for air-cooled scroll chillers.

Installation and Application Information

Operating and Standby Limits

Defines maximum and minimum operational and standby ambient temperatures and fluid limits.

Unit Placement

Guidance on selecting and preparing installation sites for the unit.

Service Clearance

Specifies required space around the unit for maintenance and airflow.

Spacing Requirements

Details clearance needed for airflow, coil replacement, and service access.

Case 1: Building or Wall on One Side of Unit

Case 2: Two Units, Side-by-Side

Case 3: Three or More Units, Side-by-Side

Case 5: Pit Installation

Chilled Water Piping

Requirements and recommendations for chilled water piping installation.

Inlet Strainer Guidelines

Water Flow Limitations

Discusses evaporator flow rates, pressure drops, and their impact.

Evaporator Freeze Protection

Measures and components to prevent evaporator freezing in cold conditions.

Chilled Water Pump

Details on wiring and controlling chilled water pumps with the chiller.

Flow Switch

Information on the requirement and installation of a chilled water flow switch.

Glycol Solutions

High Ambient Operation

Information on operating the unit in high ambient temperatures and required options.

Condenser Coil Options and Coating Considerations

Discusses various condenser coil types, coatings, and their suitability for different environments.

Refrigerant Schematics

Refrigerant Charge

Table 6: Refrigerant Charge - Microchannel Units

Data on refrigerant quantities for various AGZ models with microchannel coils.

Electrical Data

Panel High Short Circuit Current Rating

Power Connections

Details on the unit's power connection options and requirements.

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

Figure 45: Typical Field Wiring Diagram (Multi-Point Connection)

Unit Controller Operation

Controller Inputs and Outputs

Lists and describes the analog and digital inputs and outputs of the main controller.

Compressor Module 1

Compressor Module 2

EXV Module 1 and 2

Information on the function and use of Electronic Expansion Valve (EXV) modules.

Condenser Fan Output Labels

RapidRestore

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

Set Points

Explanation of adjustable set points for unit configuration and operation.

Circuit Level Set Points

Set points specific to individual refrigerant circuits, including compressor and fan staging.

Sequence of Operation

Figure 47: Unit Sequence of Operation - Cool Mode

Step-by-step operational sequence for the chiller in cool mode.

Figure 50: Unit Sequence of Operation - Ice Mode

Step-by-step operational sequence for the chiller in ice mode.

Figure 53: Circuit Sequence of Operation

Diagram illustrating the operational sequence for individual refrigerant circuits.

Unit Functions

Unit Capacity Control

How the unit's total capacity is managed based on operating conditions.

Compressor Staging in Cool Mode

Details on compressor staging logic for cooling operation.

Compressor Staging in Ice Mode

Details on compressor staging logic for ice mode operation.

Staging Sequence

Unit Enable

Procedures for enabling and disabling the unit based on setpoints and inputs.

Unit Mode Selection

Glycol Configuration

Freeze Protection

Measures to protect the evaporator and components from freezing.

Pump Selection

Auto Control

LWT Target

Explanation of how the Leaving Water Temperature target is set and adjusted.

Circuit Functions

Calculations

Circuit Control Logic

Logic governing circuit enabling, compressor availability, and state transitions.

Compressor Control

How compressors are controlled based on circuit status and unit commands.

Cycle Timers

Condenser Fan Control

How condenser fans are controlled and staged based on operating conditions.

Condenser Staging

Logic for staging condenser fans to maintain optimal performance.

Condenser Target

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

VFD Control

How Variable Frequency Drives control fan speed to manage condenser temperature.

EXV Control

Control logic for the electronic expansion valve (EXV) to manage suction superheat.

Alarms

Unit Fault Alarms

Lists and describes unit-level fault alarms that require immediate attention.

Evaporator Flow Loss

Details on the evaporator flow loss alarm trigger, action, and reset conditions.

Evaporator Water Freeze Protect

Alarm related to the evaporator freeze protection system.

Compressor Module 1 Comm Failure

Low Evaporator Pressure

Alarm triggered by low evaporator pressure conditions.

High Condenser Pressure

Using the Controller

Passwords

Edit Mode

Optional Low Ambient Fan VFD

Startup and Shutdown Procedures

Pre Startup

Steps to perform before initiating unit startup, including checklists.

Pre-Startup Water Piping Checkout

Pre-Startup Electrical Check Out

Startup

Step-by-step procedure for starting the chiller, including setpoint verification.

Shutdown

General procedures for shutting down the unit.

Temporary Shutdown

Extended Shutdown

Unit Maintenance

Routine Quarterly Cleaning of ElectroFin Coated Coil Surfaces

Filter-Driers

System Adjustment

Refrigerant Charging

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

Troubleshooting Chart

Compressor Will Not Run

Compressor Noisy Or Vibrating

High Discharge Pressure

Low Suction Pressure

Limited Product Warranty

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

The primary warranty statement covering product defects in material or workmanship.

Daikin AGZ190E Specifications

General IconGeneral
BrandDaikin
ModelAGZ190E
CategoryChiller
LanguageEnglish

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