Daikin AGZ 110D User Manual

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Operating & Maintenance Manual

OMM 1166-1

Group: Chiller

Part No. OMM1166-1

Effective: March 2014

Air-Cooled Scroll Compressor Chiller

AGZ025D – AGZ190D (Rev 0A) 25 to 190 Tons

50 - 60-Hertz, R-410A

Software Version 251699201

© 2014 Daikin Applied

Table of Contents

Table of Contents2
- Introduction3
  - Glycol Solutions5
  - Operating/Standby Limits9
- Pressure Drop Curves9
  - Minimum Allowable Flow Rates9
  - Pressure Drop Curves10
Microtech III Controller13

Questions and Answers:

A
Andrea DavisAug 21, 2025
Why is the discharge pressure high on my Daikin AGZ 110D?
- H
  Hayley HickmanAug 21, 2025
  High discharge pressure in your Daikin Chiller can stem from several issues. Noncondensables might be present in the system, requiring extraction using approved procedures. The system could be overcharged with refrigerant, necessitating removal of the excess and a check of liquid subcooling. Ensure the optional discharge shutoff valve is fully open. Verify that the FanTrol wiring is correct and that the fan is running by checking its electrical circuit and motor. A dirty condenser coil can also cause this issue, so clean it thoroughly. Finally, correct any air recirculation problems.
T
Tara MossAug 23, 2025
Why is my Daikin Chiller compressor noisy or vibrating?
- D
  donna22Aug 23, 2025
  If your Daikin Chiller compressor is making excessive noise or vibrating, start by checking the refrigerant charge, as low or no refrigerant can cause this. Ensure the compressor is running in the correct direction by verifying the unit and compressor phasing. Inspect the piping support on both the suction and discharge lines, relocating, adding, or removing hangers as needed. Finally, examine the compressor isolator bushings for wear and replace if necessary, and consider whether the compressor itself is worn, potentially requiring replacement.
T
Tanner CookAug 28, 2025
What causes high suction pressure in Daikin Chiller?
- M
  madison65Aug 28, 2025
  High suction pressure in a Daikin Chiller may result from several causes. Check the control settings to ensure the water temperature isn't excessively high. An excessive load on the system can also lead to this issue; reduce the load or add additional equipment. If the expansion valve is overfeeding, inspect the remote bulb and regulate the superheat. Lastly, verify that the compressors are running in the correct direction by checking for proper phasing.
H
herringjamesAug 31, 2025
What to do if Daikin AGZ 110D Chiller compressor oil level is too high or too low?
- M
  Michael GeorgeAug 31, 2025
  If the oil level in your Daikin Chiller compressor is too high or too low, consider these potential causes. Oil may be hanging up in the piping, so review the refrigerant piping and correct as necessary. If the oil level is genuinely low, check for leaks and add oil. Inspect the oil line fittings for looseness and tighten them. If the level is too high, adjust the thermal expansion valve. Insufficient water flow can also cause a high oil level, so adjust the flow. Excessive liquid in the crankcase can also elevate the oil level; check the crankcase heater, reset the expansion valve for higher superheat, and verify the liquid line solenoid valve operation. Short cycling can also affect oil levels; stabilize the load or increase the staging interval.
J
Jesse DanielSep 2, 2025
What to do if the Daikin Chiller discharge pressure is low?
- C
  Cynthia BowenSep 2, 2025
  Low discharge pressure in a Daikin Chiller can be caused by several factors. Refrigerant flood back is one possibility, requiring correction. If wind is blowing directly into the coil at low ambient temperatures, shield the coil or install wind guards. A faulty condenser temperature regulation system should be checked for proper operation. Insufficient refrigerant in the system can also cause this; check for leaks, repair them, and add charge. Additionally, low suction pressure and only one compressor operating can contribute to low discharge pressure.
A
Anthony MooreSep 4, 2025
Why is my Daikin AGZ 110D compressor losing oil?
- D
  Danielle StewartSep 5, 2025
  If your Daikin Chiller compressor is losing oil, start by checking for refrigerant leaks and repairing them, then add refrigerant as needed. Also, check if the suction superheat is too high and adjust it accordingly. Finally, inspect the crankcase heater for burnout and replace it if necessary.
N
Nicole PatelSep 7, 2025
What to do if Daikin Chiller compressor will not stage up?
- D
  dixonandrewSep 7, 2025
  If your Daikin Chiller compressor isn't staging up, the issue might stem from a defective capacity control, which would need replacement. Alternatively, there could be a faulty thermostat stage or a broken wire, also requiring replacement. Finally, ensure that the stages are correctly set for the specific application by resetting the thermostat settings.
M
Melinda BrownSep 9, 2025
Why are the motor overload relays or circuit breakers open on my Daikin AGZ 110D?
- B
  Brooke ToddSep 9, 2025
  If the motor overload relays or circuit breakers in your Daikin Chiller are opening, it could be due to low voltage during high load conditions; check the supply voltage for excessive line drop. Defective or grounded wiring in the motor can also cause this, necessitating replacement of the compressor motor. Inspect for loose power wiring or burnt contactors, tightening all connections. Also, high condenser temperature and a power line fault causing unbalanced voltage can trigger this issue.
O
oblackSep 12, 2025
What causes the compressor thermal protection switch to open on a Daikin AGZ 110D Chiller?
- A
  audrey63Sep 12, 2025
  If the compressor thermal protection switch on your Daikin Chiller is open, it could be due to operating beyond design conditions, requiring additional facilities to bring conditions within allowable limits. A partially shut discharge valve can also cause this, so ensure it's fully open. Additionally, a blown compressor internal gasket, voltage range issues or imbalance, high superheat, or compressor bearing failure can trigger this switch.

Daikin AGZ 110D Specifications

General

Brand	Daikin
Model	AGZ 110D
Category	Chiller
Language	English

Summary

Introduction

General Description

Provides an overview of the chiller's components and features.

Nomenclature

Explains the model naming convention.

Hazard Identification Information

Details safety warnings, cautions, and danger notices.

Ambient Air Temperature Limitations

Standard/High Ambient Panels

Discusses operating temperature limits and panel options for different ambient conditions.

Water Flow Limitations

Explains evaporator flow rate and pressure drop considerations for proper control.

System Water Volume Considerations

Discusses factors related to system water volume for stable operation.

Glycol Solutions

Altitude Correction Factors

Explains how altitude affects chiller performance and provides correction factors.

Evaporator Temperature Drop Factors

Discusses adjustment factors for evaporator temperature drops outside the standard range.

Evaporator Freeze Protection

Details methods and components for protecting the evaporator from freezing.

Operating/Standby Limits

Operating/Standby Limits

Defines the operational and standby temperature and flow limits for the chiller.

Pressure Drop Curves

Introduces curves and tables for evaporator pressure drops based on flow rate.

Minimum Allowable Flow Rates

Discusses minimum flow requirements for stable operation in different system types.

MicroTech® III Controller

Overview and Operator Interface

Introduces the controller, its user interface, navigation, and basic operation.

Controller Inputs and Outputs

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

Unit Functions and Setpoints

Details unit-level setpoints, configuration, timers, and alarm settings.

Circuit Functions and Control Logic

Describes circuit enabling, states, pumpdown, compressor control, and fan staging.

Alarms, Events, and Clearing

Covers fault types, warnings, events, and procedures for clearing alarms.

Using the Controller Interface

Explains keypad navigation, menus, passwords, and editing setpoints.

Optional Low Ambient Fan VFD

VFD Interface (HMI)

Describes the Human Machine Interface for Variable Frequency Drive control and display.

Recommended Periodic Inspection

Inspection Checklist

Outlines routine checks for general components, electrical, and refrigeration systems.

Optional BAS Interface

Discusses integration options with Building Automation Systems and relevant manuals.

Startup

Pre Start-up Checks

Details initial inspections and preparations before starting the chiller.

Start-Up Procedure

Provides step-by-step instructions for initial chiller operation and checks.

Shutdown Procedures

Explains procedures for temporary and extended shutdowns.

Service

Refrigerant Terminology and Safety

Defines refrigerant terms and outlines critical safety precautions for R-410A.

POE Lubricants

Discusses the type, handling, and importance of POE oil for compressor lubrication.

Refrigerant Charging

Details procedures for charging R-410A refrigerant, including subcooling and superheat checks.

Filter-Driers

Explains filter-drier replacement criteria and procedures based on pressure drop.

Liquid Line Solenoid Valve

Describes maintenance requirements for the liquid line solenoid valve.

AGZ-D Troubleshooting Chart

Compressor Start-Up Issues

Covers causes and fixes for compressors not running, noisy, or vibrating.

Pressure Issues Troubleshooting

Addresses troubleshooting for high/low discharge and suction pressures.

Compressor Staging and Oil Issues

Troubleshoots staging problems, oil levels, and oil loss.

Motor and Thermal Protection Faults

Details troubleshooting for motor overloads, thermal protection, and wiring issues.

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