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Daikin AGZ055E - User Manual

Daikin AGZ055E
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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

  • L
    Latoya PerkinsAug 15, 2025
    What causes motor overload relays or circuit breakers to open in my Daikin AGZ055E Chiller?
    • D
      Dustin RodriguezAug 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.
  • P
    paul85Aug 22, 2025
    Why is my Daikin Chiller's compressor noisy or vibrating?
    • K
      Kevin LaneAug 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.
  • B
    Brandy AustinAug 25, 2025
    What causes high discharge pressure in my Daikin AGZ055E?
    • C
      Chad SalazarAug 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
    Katie WeaverSep 1, 2025
    What to do if my Daikin AGZ055E Chiller compressor will not stage up?
    • J
      James StanleySep 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.
  • R
    Richard Knight DDSSep 4, 2025
    Why are the compressor staging intervals too short on my Daikin AGZ055E?
    • A
      Alyssa AguilarSep 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).
  • N
    Nicole SmithSep 12, 2025
    What causes the compressor thermal protection switch to open on my Daikin AGZ055E Chiller?
    • A
      Alexander TerrySep 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.
  • D
    David JacksonNov 17, 2025
    What to do if my Daikin Chiller compressor will not run?
    • C
      Clifford HernandezNov 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. ...
  • W
    wendyholmesNov 27, 2025
    How to fix low suction pressure in a Daikin AGZ055E Chiller?
    • K
      kyle11Nov 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

Pre-Start Checklist

Pre Start-Up Checklist

Checklist for pre-startup, covering unit condition, installation, electrical, and refrigerant systems.

Installation and Application Information (continued)

Operating and Standby Limits

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

Clearance for Building or Wall on One Side

Clearance for Three or More Units Side-by-Side

Pit Installation Guidelines

Guidance on pit installation requirements and considerations for operating problems.

Pit Installation for AGZ140-240 E Models

Chilled Water Piping Requirements

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

Water Flow Limitations

Information on constant and variable evaporator flow rates and pressure drops.

Chilled Water Pump Control

Details on controlling chilled water pumps via the chiller's microprocessor.

Low and High Ambient Operation

Operating considerations for low and high ambient temperature conditions.

Unit Placement and Service Clearance

Guidelines for unit placement, including required service clearances around the unit.

Clearance for Two Units Side-by-Side

Clearance with Open Screening Walls

Evaporator Freeze Protection

Methods and components for protecting the evaporator from freezing.

Electrical Data

Electrical Data Notes, Ratings, and Connections

Notes on electrical connections, HSCCR ratings, power connections, and control center components.

Electrical Data (continued)

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

Typical field wiring diagram for single-point electrical connections.

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

Typical field wiring diagram for multi-point electrical connections.

Single Point Electrical Data Tables (60;50 Hz)

Multiple Point Electrical Data Tables (60;50 Hz)

Unit Controller Operation

Unit Controller Operation (continued)

Controller Inputs and Outputs

Detailed lists of analog and digital inputs and outputs for the main controller.

Set Points Overview

General information on set points, their adjustment, and storage.

Unit Level Set Point Defaults and Ranges

Detailed tables of default and adjustable set points for unit level configuration.

Communication Configuration Settings

Table detailing configuration settings for communication protocols like BACnet, Lonworks, and Modbus.

Circuit Level Set Points

Set points that apply individually to each refrigerant circuit.

Condenser Set Point Configuration Groups

Configuration Group 4 Set Points and Special Operation

Compressor Module I;O

Dynamic Set Point Ranges

Sequence of Operation

Unit Sequence of Operation - Cool Mode

Flowchart illustrating the sequence of operation for the chiller in Cool Mode.

Sequence of Operation (continued)

Unit Sequence of Operation - Cool Mode (continued)

Further continuation of the unit sequence of operation flowchart for Cool Mode.

Unit Sequence of Operation - Ice Mode

Flowchart illustrating the sequence of operation for the chiller in Ice Mode.

Unit Sequence of Operation - Ice Mode (continued)

Further continuation of the unit sequence of operation flowchart for Ice Mode.

Unit Functions

Unit Capacity Control

Explanation of how unit capacity is controlled based on compressor staging and limits.

Unit Functions (continued)

Compressor Staging Logic

Details on compressor staging logic for Cool and Ice modes, including delays and sequences.

Unit Capacity Overrides and Demand Limit

Unit Mode Settings and Glycol Configuration

Details on setting the unit operating mode and configuring glycol use.

Freeze Protection and Pump Control

Explanation of freeze protection mechanisms and evaporator pump control logic.

RapidRestore Option Overview

Description of the RapidRestore option for faster unit restart and loading.

LWT Target and Reset

Evaporator Pump Control States

Circuit Functions

Circuit Functions (continued)

Compressor Control Logic

Logic for enabling circuits and controlling compressor availability and operation.

Condenser Target and Fan Staging Logic

Explanation of condenser target selection and the logic for staging condenser fans up and down.

Condenser Staging

EXV Control States and Operation

Explanation of EXV control states (Closed, Superheat) and operation.

Low Evaporator and High Condenser Pressure Handling

Alarms

Unit Fault Alarms

Details on unit fault alarms, including triggers, actions, and reset procedures.

Circuit Fault Alarms

Details on circuit fault alarms, including triggers, actions, and reset procedures.

Alarms (continued)

Unit Problem and Warning Alarms

Using the Controller

Unit Controller Schematic and Navigation

Schematic of the unit controller keypad and display, and guidance on navigation.

Using the Controller (continued)

Password Management and Editing Setpoints

Instructions for entering passwords, editing set points, and understanding access levels.

Optional Low Ambient Fan VFD

Low Ambient Fan VFD Operation and Inverter Basics

Inverter Output to Motor Connections

Optional Low Ambient Fan VFD (continued)

VFD Alarms, Faults, and Errors Types

Classification of VFD alarms, faults, and errors with their respective drive responses.

VFD Fault Reset Methods and Periodic Inspection

Methods for resetting VFD faults and a checklist for periodic equipment inspections.

Startup and Shutdown Procedures

Pre Startup Procedures

Detailed pre-startup procedures covering water piping and electrical checks.

Startup Steps

Key steps to follow for starting up the chiller, including verifying flow and settings.

Startup and Shutdown Procedures (continued)

Pumpdown Switch Positions and Shutdown Procedures

Unit Maintenance

Condenser Coil Cleaning Procedures

Unit Maintenance (continued)

Refrigerant Charging Procedures

Step-by-step instructions for recharging the unit with R-410A refrigerant.

R-410 A Refrigerant Terminology, Safety, and POE Lubricants

Terminology, safety precautions for R-410A, and information on POE lubricants.

Refrigerant Charging and Service Notes

System Adjustment and Expansion Valve

Troubleshooting Chart

Compressor Issues Troubleshooting

Troubleshooting guide for compressor issues such as not running, noise, vibration, and pressure problems.

Troubleshooting Chart (continued)

Staging, Oil Level, and Motor Protection Troubleshooting

Troubleshooting for compressor staging, oil levels, motor overloads, and thermal protection.

Limited Product Warranty

Mandatory Product Startup and Warranty Period

Daikin AGZ055E Specifications

General IconGeneral
BrandDaikin
ModelAGZ055E
CategoryChiller
LanguageEnglish

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