Daikin AGZ 160D User Manual (English)

Questions and Answers:

C
Crystal GonzalesAug 20, 2025
Why is the discharge pressure high on my Daikin AGZ 160D?
- F
  Francis WheelerAug 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.
M
Marissa TuckerAug 23, 2025
Why is my Daikin AGZ 160D Chiller compressor noisy or vibrating?
- C
  Caleb WilliamsAug 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.
K
Kenneth MorrowAug 28, 2025
What causes high suction pressure in Daikin Chiller?
- R
  rubioleslieAug 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.
W
wcaldwellAug 31, 2025
What to do if Daikin AGZ 160D Chiller compressor oil level is too high or too low?
- J
  Jeremy FieldsAug 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.
T
tristanarmstrongSep 2, 2025
What to do if the Daikin AGZ 160D Chiller discharge pressure is low?
- C
  Craig BaileySep 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
Anna FloydSep 4, 2025
Why is my Daikin AGZ 160D compressor losing oil?
- M
  Mark SteeleSep 4, 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.
S
Susan HullSep 7, 2025
What to do if Daikin Chiller compressor will not stage up?
- D
  drogersSep 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.
T
Theresa BoydSep 10, 2025
Why are the motor overload relays or circuit breakers open on my Daikin Chiller?
- L
  Laura JonesSep 10, 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.
N
njohnsonSep 12, 2025
What causes the compressor thermal protection switch to open on a Daikin AGZ 160D?
- J
  Joseph BellSep 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 160D Specifications

General

Brand	Daikin
Model	AGZ 160D
Category	Chiller
Language	English

Summary

Introduction to the Chiller

Hazard Identification Information

Safety guidelines for potential hazards during operation and maintenance.

Ambient Air Temperature Limitations

Ambient Panel Options

Specifications for units operating at high ambient temperatures.

Water Flow and System Volume Considerations

Water Flow Limitations

Importance of maintaining proper flow rates for chiller control.

Variable Speed Pumping

How variable water flow affects chiller operation and control.

Glycol Solutions in Chillers

Glycol Solution Calculations

Factors and formulas for calculating performance with glycol mixtures.

Performance Adjustment Factors

Altitude Correction Factors

How altitude affects unit performance and required adjustments.

Evaporator Temperature Drop Factors

Adjustment factors for different evaporator temperature differences.

Fouling Factor Impact

How fouling affects performance and calculation adjustments.

Evaporator Freeze Protection

Freeze Protection Measures

Components and methods used to prevent evaporator freeze-up.

Operating and Standby Limits

Unit Operating Limits

Maximum and minimum operating ambient and water temperatures.

Pressure Drop Curves

Minimum Allowable Flow Rates

Critical flow rates to ensure stable chiller operation and control.

Constant-Chilled Water Flow Systems

Flow rate requirements for constant flow systems.

Variable-Chilled Water Flow Systems

Flow rate requirements for variable flow systems.

Evaporator Pressure Drop Data

Pressure Drop Curve Chart

Graphical data showing pressure drop versus flow rate.

MicroTech® III Controller Section

Controller Overview and Inputs/Outputs

Introduction to controller features, signals, and interface.

Setpoints and Configuration

Managing unit and circuit setpoints for optimal operation.

Unit and Circuit Control Logic

How the controller manages unit and circuit operations.

Alarms, Events, and Troubleshooting

System notifications, event logging, and controller troubleshooting.

Controller Navigation and Interface

Methods for interacting with the controller via its interface.

Controller Inputs and Outputs Details

Analog Signal Management

Details of analog inputs and outputs for sensors and control.

Digital Signal Management

Details of digital inputs and outputs for unit states and commands.

Compressor Module Functionality

Compressor Module Signal Handling

Analog and digital signals for compressor modules 1 and 2.

EXV, Sensor, and Setpoint Module Information

EXV Module and Sensor Details

EXV control, sensor information, and actuator data.

Setpoint Management and Tables

Storing and adjusting controller setpoints.

Unit Level Setpoint Configuration

Mode, Enabling, and Staging Setpoints

Configuration for unit enable, modes, and compressor staging.

Timer, Sensor Offset, and Alarm Setpoints

Settings for timers, sensor offsets, and alarm triggers.

Circuit Level Setpoint Configuration

Circuit Mode and EXV Setpoints

Settings for circuit enable, EXV control, and superheat.

Condenser Control and Fan Setpoints

Targets and deadbands for condenser operation and fan staging.

Sensor Offset Setpoints

Offset adjustments for circuit sensors.

Auto Adjusted Setpoint Ranges

LWT and Evaporator Freeze Setpoint Ranges

Adjustable ranges for LWT and freeze protection setpoints.

Low Evaporator Pressure and Special Setpoints

Ranges for low pressure setpoints and special operation settings.

Security and Unit Function Definitions

Password Protection and Security

Protecting setpoints with passwords for operator access.

Unit Function Calculations

Definitions of LWT slope, pulldown rate, and LWT error.

Unit Control Functions: Capacity and Enable

Unit Capacity Calculation and Control Band

How unit capacity is determined and controlled.

Staging Temperatures and Unit Enable Logic

Logic for compressor staging and enabling unit operation.

Unit Mode Selection and States

Unit Mode Selection Logic

Determining unit mode based on setpoints and inputs.

Unit States and Transitions

States like Off, Auto, and Pumpdown and their transitions.

Unit Status, Delays, and Ice Mode

Unit Status Indicators and Transitions

Meanings of unit status indicators and state changes.

Start Delays for Power Up and Ice Mode

Time delays for compressor startup and ice mode operation.

Unit Status Conditions and Evaporator Pump Control

Unit Status Definition Details

Detailed conditions defining various unit status indicators.

Evaporator Pump Control States and Transitions

States and transitions for evaporator pump operation.

Evaporator Pump Control and LWT Target Selection

Evaporator Pump Operation Logic

Pump selection, staging, and transition logic.

Base LWT Target Determination

How the base LWT target is selected based on inputs.

LWT Reset and Unit Capacity Control

LWT Reset Functionality

How LWT target is adjusted based on reset input.

Unit Capacity Control and Compressor Staging

Mechanisms for controlling unit capacity and compressor staging.

Stage Up and Down Delay Timers

Time delays for compressor staging adjustments.

Compressor Staging and Capacity Overrides

Compressor Staging in Ice Mode

Staging logic for compressors when operating in ice mode.

Unit Capacity Overrides and Demand Limit

Methods to limit total unit capacity via demand signals.

Capacity Limits and High Ambient Operation

Demand Limit and Network Capacity Stages

Capacity stages based on demand limit and network signals.

LWT Pulldown Rate and High Ambient Limits

Limiting pulldown rate and operating at high ambient temperatures.

Circuit Functions and Control Logic

Circuit Function Definitions

Calculations for approach, superheat, and pumpdown pressure.

Circuit Enabling and States

Conditions for circuit enablement and definition of circuit states.

Circuit State Transitions and Pumpdown Procedure

Circuit State Transition Logic

Logic for transitions between circuit states.

Pumpdown Procedure Steps

Detailed steps for performing a pumpdown cycle.

Circuit Status and Compressor Control Logic

Circuit Status Indicators

Meanings of different circuit status indicators.

Low Ambient Starts and Compressor Control

Handling low ambient starts and compressor control rules.

Compressor and Condenser Fan Control Logic

Compressor Start/Stop Logic

Rules for initiating and terminating compressor operation.

Condenser Fan Staging Strategy

How condenser fans are staged based on capacity needs.

Condenser Target and VFD Fan Control

Condenser Target Selection and Staging

Selecting condenser targets and staging fan operation.

VFD Condenser Fan Control Logic

Using VFDs for precise condenser fan speed control.

EXV Control Strategy and Manual Operation

EXV Auto and Manual Control

Controlling EXV position for superheat and pressure.

EXV Position Range and Settings

EXV range based on fans and compressors running.

Solenoid Valves and Alarm Classifications

Solenoid Valve Operation

Operation of liquid line and hot gas bypass solenoid valves.

Alarm Classification System

Alarm classification per Global Chiller Protocol Standard.

Unit Fault Alarm Triggers

Triggers and actions for unit fault alarms.

Alarm Types and Sensor Faults

Unit Warning and Sensor Fault Alarms

Handling unit warnings and sensor fault alarms.

Module Communication Failure Alarms

Alarms for communication failures with control modules.

Unit Problem Alarms and Warnings

Unit Problem Alarms

Specific unit problem alarms like Low Ambient Lockout.

Unit Warning Alarms

Warnings related to external events or bad input signals.

Circuit Fault Alarms

PVM/GFP and Low Evaporator Pressure Faults

Faults related to PVM/GFP input and low evaporator pressure.

Circuit Fault Alarms (Continued)

High Condenser Pressure and Pressure Switch Faults

Faults related to high condenser pressure and switches.

Motor Protection and OAT Restart Faults

Faults related to motor protection and low OAT restarts.

Circuit Faults and Events

Evaporator and Condenser Sensor Faults

Faults related to pressure and temperature sensors.

Low Evaporator Pressure - Hold Event

Event indicating sustained low evaporator pressure.

Circuit Events and Warning Alarms

Low Evaporator Pressure - Unload Event

Event causing compressor unloading due to low evaporator pressure.

High Condenser Pressure - Unload Event

Event causing compressor unloading due to high condenser pressure.

Failed Pumpdown Warning

Warning for a pumpdown state exceeding the allowed time.

Unit and Circuit Events

Unit Power Restore Event

Logged event for controller power restoration.

Evaporator Pressure Events

Events related to low evaporator pressure conditions.

Condenser Pressure Events

Events related to high condenser pressure conditions.

Alarm Log Management Procedures

Active Alarms and Alarm Log

Display and history of active alarms and events.

Clearing Alarms from Controller

Steps to clear active alarms via the controller interface.

Controller Interface and Navigation Basics

Controller Physical Interface Description

Details of buttons, display, and navigation wheel.

Typical Display Screen Layout

Understanding screen elements and navigation cues.

Controller Navigation and Password Access

Navigating Controller Menus

How to move between menus and screens.

Password Entry and Security

Accessing controller functions via passwords.

Controller Operation Modes

Navigation Mode Operations

Using the navigation wheel to select and view data.

Edit Mode Operations

Changing setpoints and parameters using the controller.

Controller Menu Structure and Links

Menu Screen Identification and Links

Overview of available screens and their identifiers.

Optional Low Ambient Fan VFD Control

VFD Fan Speed Regulation Strategy

Using VFDs to control fan speed for low ambient operation.

VFD Interface (HMI) Operation Guide

VFD Key and Display Functionality

Understanding the functions of the VFD's keys and display.

VFD LCD Display Data Interpretation

Interpretation of Displayed Data Modes

Meaning of different display modes and data fields.

VFD Alarm and Status Indicator Meanings

Alarm Content and LED State Interpretation

Interpretation of alarm states via LEDs.

LO/RE and RUN LED Indicator Meanings

Understanding the status indicated by LO/RE and RUN LEDs.

VFD Faults, Errors, and Reset Procedures

Types of VFD Faults and Errors

Classification and response of VFD faults and errors.

VFD Fault Reset Methods

Procedures for clearing VFD faults.

Periodic Inspection and BAS Interface

Recommended Periodic Inspection Checklist

Routine inspection points and corrective actions for equipment.

Optional BAS Interface Connectivity Information

Information on integrating the chiller with a Building Automation System.

Chiller Startup Procedures

Pre-Startup Checks and Temporary Shutdown

Essential checks and procedures for temporary shutdowns.

Startup Sequence Steps

Step-by-step guide for starting the chiller.

Chiller Startup and Shutdown Procedures

Extended Shutdown Restart and Piping Checks

Restarting after extended shutdown and piping system checks.

Electrical System Pre-Startup Checks

Electrical checks before initial unit startup.

Chiller Operation Modes and Controls

Hot Gas Bypass System Operation

Functionality and adjustment of the hot gas bypass system.

VFD Low Ambient Control Operation

Using VFDs for fan control at low ambient temperatures.

Compressor Communication Module Functionality

Module Operation Indicators and Warning Codes

Interpretation of module LEDs and warning codes.

Compressor Alert and Lockout Codes

Codes indicating alerts and lockouts for the compressor.

Filter-Driers and System Adjustment

Filter-Drier Maintenance and Replacement

When and how to replace filter-driers.

Liquid Line Sight Glass Assessment

Using the sight glass for charge and moisture checks.

Refrigerant Charging and Evaporator Details

Refrigerant Charging Procedures

Step-by-step guide for charging the chiller with refrigerant.

Evaporator Types and Freeze Protection

Description of evaporator models and their freeze protection.

Unit Maintenance Procedures

General Unit Maintenance Tasks

Routine service checks and recommended schedule.

Compressor and Condenser Maintenance

Maintenance for scroll compressors and condensers.

Optional High Ambient Control Panel

Features and requirements for high ambient operation.

Planned Maintenance Schedule

Maintenance Task Breakdown by Frequency

Table detailing weekly, monthly, and annual maintenance tasks.

Service Information and Safety Precautions

Refrigerant Terminology and Safety

Definitions of key refrigerant terms and safety guidelines.

POE Lubricant Handling and Use

Guidelines for using and storing POE lubricants.

Service - Refrigerant Charging Process

Refrigerant Charging Procedures

Step-by-step guide for charging the chiller with refrigerant.

Service - Filter-Driers and Pressure Drop

Filter-Drier Replacement Criteria

Conditions requiring filter-drier replacement.

Filter-Drier Pressure Drop Limits

Maximum recommended pressure drops across filter-driers.

Filter-Drier, Solenoid Valve, and Evaporator Maintenance

Filter-Drier Moisture Assessment

Assessing moisture levels via the sight glass.

Solenoid Valve Servicing

Servicing and replacement of solenoid valves.

Evaporator Description and Basic Care

Overview of evaporator types and basic maintenance.

AGZ-D Troubleshooting Chart - Compressor Issues

Compressor Not Running Troubleshooting

Diagnosing and resolving compressor startup failures.

Compressor Noise, Vibration, and Pressure Issues

Troubleshooting noise, vibration, and pressure problems.

Compressor Staging Troubleshooting

Troubleshooting issues with compressor staging intervals.

AGZ-D Troubleshooting Chart - Oil and Motor Issues

Compressor Oil Level and Loss Troubleshooting

Diagnosing and correcting compressor oil level problems and oil loss.

Motor Overload and Thermal Protection Faults

Troubleshooting motor overloads and thermal protection trips.

Daikin Applied Support and Information

Training and Development Resources

Information on training programs for Daikin Applied HVAC products.

Product Warranty and Aftermarket Services

Details on warranty and how to find parts and service.

Related product manuals

Daikin AGZ 160D User Manual

Table of Contents

Questions and Answers:

Daikin AGZ 160D Specifications

Summary

Introduction to the Chiller

Hazard Identification Information

Ambient Air Temperature Limitations

Ambient Panel Options

Water Flow and System Volume Considerations

Water Flow Limitations

Variable Speed Pumping

Glycol Solutions in Chillers

Glycol Solution Calculations

Performance Adjustment Factors

Altitude Correction Factors

Evaporator Temperature Drop Factors

Fouling Factor Impact

Evaporator Freeze Protection

Freeze Protection Measures

Operating and Standby Limits

Unit Operating Limits

Pressure Drop Curves

Minimum Allowable Flow Rates

Constant-Chilled Water Flow Systems

Variable-Chilled Water Flow Systems

Evaporator Pressure Drop Data

Pressure Drop Curve Chart

MicroTech® III Controller Section

Controller Overview and Inputs/Outputs

Setpoints and Configuration

Unit and Circuit Control Logic

Alarms, Events, and Troubleshooting

Controller Navigation and Interface

Controller Inputs and Outputs Details

Analog Signal Management

Digital Signal Management

Compressor Module Functionality

Compressor Module Signal Handling

EXV, Sensor, and Setpoint Module Information

EXV Module and Sensor Details

Setpoint Management and Tables

Unit Level Setpoint Configuration

Mode, Enabling, and Staging Setpoints

Timer, Sensor Offset, and Alarm Setpoints

Circuit Level Setpoint Configuration

Circuit Mode and EXV Setpoints

Condenser Control and Fan Setpoints

Sensor Offset Setpoints

Auto Adjusted Setpoint Ranges

LWT and Evaporator Freeze Setpoint Ranges

Low Evaporator Pressure and Special Setpoints

Security and Unit Function Definitions

Password Protection and Security

Unit Function Calculations

Unit Control Functions: Capacity and Enable

Unit Capacity Calculation and Control Band

Staging Temperatures and Unit Enable Logic

Unit Mode Selection and States

Unit Mode Selection Logic

Unit States and Transitions

Unit Status, Delays, and Ice Mode

Unit Status Indicators and Transitions

Start Delays for Power Up and Ice Mode

Unit Status Conditions and Evaporator Pump Control

Unit Status Definition Details

Evaporator Pump Control States and Transitions

Evaporator Pump Control and LWT Target Selection

Evaporator Pump Operation Logic

Base LWT Target Determination

LWT Reset and Unit Capacity Control

LWT Reset Functionality

Unit Capacity Control and Compressor Staging

Stage Up and Down Delay Timers

Compressor Staging and Capacity Overrides

Compressor Staging in Ice Mode

Unit Capacity Overrides and Demand Limit

Capacity Limits and High Ambient Operation

Demand Limit and Network Capacity Stages

LWT Pulldown Rate and High Ambient Limits