Daikin AGZ070E User Manual (English)

Questions and Answers:

R
Robert HudsonAug 14, 2025
What causes motor overload relays or circuit breakers to open in my Daikin AGZ070E Chiller?
- S
  Shane RossAug 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.
M
Mary BrownAug 21, 2025
Why is my Daikin AGZ070E Chiller's compressor noisy or vibrating?
- A
  Angela LeAug 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.
B
briana93Aug 25, 2025
What causes high discharge pressure in my Daikin Chiller?
- A
  April SullivanAug 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.
J
Jessica LeeAug 31, 2025
What to do if my Daikin AGZ070E compressor will not stage up?
- G
  Gabriel ThomasAug 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.
R
Robert HermanSep 3, 2025
Why are the compressor staging intervals too short on my Daikin Chiller?
- T
  Tom GarciaSep 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).
S
Summer ManningSep 12, 2025
What causes the compressor thermal protection switch to open on my Daikin AGZ070E?
- M
  Melissa StarkSep 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.

Daikin AGZ070E Specifications

General

Brand	Daikin
Model	AGZ070E
Category	Chiller
Language	English

Summary

Pre-Start Checklist

Pre-Start Checklist – Scroll Compressor Chillers

Checklist to be completed before unit startup, ensuring all prerequisites are met for proper operation.

Installation and Application Information

Operating and Standby Limits

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

Case 5: Pit Installation

Considerations for installing units in pits or enclosed areas, including clearance and performance adjustments.

Low Ambient Operation

How compressor staging adapts to ambient temperature and the use of fan VFDs for low ambient operation.

Unit Placement

Guidelines for selecting and preparing a suitable location and foundation for the unit.

High Ambient Operation

Requirements for high ambient operation, including optional packages and potential capacity reduction.

Service Clearance

Recommended minimum clearances around the unit for service access and airflow.

Chilled Water Piping

Field installed water piping to the chiller must include

Essential components and requirements for field-installed chilled water piping systems.

Inlet Strainer Guidelines

Guidelines for selecting and installing inlet strainers for evaporators, including size and type recommendations.

Evaporator Freeze Protection

Measures to protect the evaporator from freezing, including insulation and heaters.

Chilled Water Pump

Importance of controlling chilled water pumps via the chiller's microprocessor for proper operation and freeze protection.

Flow Switch

Requirement for chilled water flow switches for evaporator protection and unit shutdown if flow is interrupted.

Glycol Solutions

Impact of glycol/water mixtures on system capacity, efficiency, and pressure drop.

Condenser Coil Options and Coating Considerations

Details on standard microchannel coils and alternative options like BlackFin™ and ElectroFin® coatings.

Refrigerant Schematics

Diagrams illustrating the refrigerant flow and components for various AGZ-E models.

Dimensions and Weights - Packaged Units

Tables and diagrams showing physical dimensions, weight, and mounting locations for AGZ-E models.

Isolator Information

Details on spring and rubber-in-shear isolator kits and their mounting locations.

Pressure Drop Data

Curves and tables illustrating pressure drop characteristics for various flow rates.

Electrical Data Notes

Important notes regarding power wiring, wire sizing, fuse/breaker selection, and grounding.

Electrical Data

Panel High Short Circuit Current Rating

Typical Field Wiring Diagram (Single-Point Connection)

Electrical wiring diagram for single-point power connections, showing control and power circuits.

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

Electrical data tables for single-point connections, detailing MCA, RFS, MFS, and lug ranges.

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

Electrical data for single-point connections, detailing MCA, RFS, MFS, and lug ranges for models 120E-180E.

Table 18: Electrical Data - Multiple Point (60/50 Hz)

Electrical data for multiple-point connections, detailing MCA, RFS, MFS, and lug ranges for models 030E-060E.

Table 19: Electrical Data - Multiple Point (60/50 Hz)

Electrical data for multiple-point connections, detailing MCA, RFS, MFS, and lug ranges for models 065E-110E.

Table 20: Electrical Data - Multiple Point (60/50 Hz)

Electrical data for multiple-point connections, detailing MCA, RFS, MFS, and lug ranges for models 120E-180E.

Table 21: Electrical Data - Multiple Point (60/50 Hz)

Electrical data for multiple-point connections, detailing MCA, RFS, MFS, and lug ranges for models 190E-240E.

Electrical Control Center

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

Electrical data tables for single-point connections, detailing MCA, RFS, MFS, and lug ranges.

Table 17: Electrical Data - Single Point (60/50 Hz)

Electrical data for single-point connections, detailing MCA, RFS, MFS, and lug ranges for models 190E-240E.

Unit Controller Operation

EXV Module 1 and 2

Dynamic Set Point Ranges

Table 47: Commincation Configuration

Dynamic Set Point Ranges and Defaults

Condenser Fan Output Labels

RapidRestore®

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

Set Points

Details on how set points are configured, including default values and adjustable ranges.

Circuit Level Set Points

Set points that apply to individual refrigerant circuits, covering mode, compressor, EXV, and fan settings.

Sequence of Operation

Unit Sequence of Operation - Cool Mode

Flowchart detailing the unit's operational sequence for cooling mode, including startup and status checks.

Unit Sequence of Operation - Cool Mode (continue)

Final part of the cool mode sequence, detailing capacity decrease and shutdown logic.

Unit Sequence of Operation - Ice Mode

Flowchart outlining the unit's operational sequence specifically for ice mode.

Unit Sequence of Operation - Ice Mode (continue)

Continuation of the ice mode sequence, covering capacity increase and ice cycle completion.

Unit Sequence of Operation - Ice Mode (continued)

Final part of the ice mode sequence, detailing unit capacity and shutdown procedures.

Unit Functions

Unit Enable

Leaving Water Temperature (LWT) Reset

RapidRestore® Option

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

Compressor Starts Per Hour

Evaporator Pump Control

States of evaporator pump control: Off, Start, Run, and transitions between them.

Unit Mode Selection

Freeze Protection

Conditions under which the evaporator pump starts for freeze protection and when it ends.

Fast Loading

How the unit performs fast loading after unit power up when RapidRestore® is active.

Sound Reduction

Special mode to reduce sound levels by limiting condenser fan speeds.

Pump Selection

How pump output is determined by the Evap Pump Control set point, detailing configurations.

Network Limit

Capacity Changes

Primary/Standby Pump Staging

Motor Protection Module Power Up Start Delay

Auto Control

Backup Chiller Operation

Ice Mode Start Delay

Maximum LWT Pulldown Rate

Low Ambient Lockout

How the chiller responds to low outdoor ambient temperatures, with configurable options.

High Ambient Limit

LWT Target

How the Leaving Water Temperature target is determined based on control source, mode, and available modes.

Unit Capacity Control

Methods for controlling unit capacity based on compressor staging and other factors.

Compressor Staging in Cool Mode

Logic for starting and stopping compressors in cool mode based on LWT and delays.

Compressor Staging in Ice Mode

Compressor staging logic specific to ice mode operation.

Staging Sequence

Rules for determining the next compressor to start or stop, balancing circuits and run hours.

Unit Capacity Overrides

Demand Limit

Circuit Functions

Calculations

Formulas for calculating refrigerant saturated temperature, evaporator, condenser, suction superheat, and pumpdown pressure.

Cycle Timers

Condenser Target

How the condenser target is selected based on circuit capacity and minimum enforced targets.

High IPLV Mode

EXV Position Range

Circuit Control Logic

Conditions for enabling a circuit and determining compressor availability for starting.

Pumpdown Procedure

Condenser Fan Control

How condenser fans are staged based on compressor operation and circuit states.

Staging Up

Additional Conditions For Microchannel Coils

Circuit States

Low Ambient Starts

How low ambient temperature affects compressor starting and potential lockout conditions.

Condenser Staging

Use of digital outputs and VFDs for controlling condenser fan staging across different circuit configurations.

Staging Down

Circuit Status

VFD Control

How VFDs are used to control fan speed to meet condenser temperature targets.

EXV Control

States of EXV control (Closed, Superheat) and their operational logic.

Manual Control

Compressor Control

How compressors are controlled during run and pumpdown states, and conditions for starting/stopping.

Stage Up Compensation

Hot Gas Bypass Solenoid Valve

Sound Reduction Operation

How sound reduction limits VFD fan speed and affects fan operation.

Capacity Overrides – Limits of Operation

Conditions that override automatic capacity control, including low evaporator and high condenser pressure.

Alarms

EXV Module 2 Comm Failure

Evaporator EWT Sensor Fault

Mechanical High Pressure Switch

Unit Problem Alarms

Motor Protection Fault

Compressor Module 1 Comm Failure

Low OAT Restart Fault

Circuit Events

Circuit Fault Alarms

Compressor Module 2 Comm Failure

No Pressure Change After Start

EXV Module 1 Comm Failure

Evaporator Pressure Sensor Fault

Condenser Pressure Sensor Fault

Suction Temperature Sensor Fault

Circuit Warning Alarm

Using the Controller

Figure 61: Schematic of Unit Controller

Passwords

Procedure for entering passwords to access editable parameters and different access levels.

Figure 66: Controller Keypad Sample Navigation

Navigation Mode

Navigating

Edit Mode

Optional Low Ambient Fan VFD

Description of the VFD fan control used for unit operation below 32°F (0°C).

VFD Interface

Table 83: Types of Alarms, Faults, and Errors

Recommended Periodic Inspection

Inverter Output to the Motor

Optional BAS Interface

Startup and Shutdown Procedures

Pre Startup

Initial inspection steps before starting the chiller, covering components and leak tests.

Pre-Startup Water Piping Checkout

Post Startup

Pre-Startup Electrical Check Out

Shutdown

Procedures for temporary and extended shutdown of the chiller unit.

Startup

Procedures for initiating chiller startup, including controller familiarization and setpoint verification.

Component Operation

Hot Gas Bypass (Optional)

Operation of the optional hot gas bypass for managing low load conditions and compressor cycling.

Replaceable Core Filter-Driers

VFD Low Ambient Control (Optional)

How the optional VFD fan control manages low ambient temperatures.

Crankcase Heaters

Compressor Communications

Evaporator

Description of evaporator types (brazed plate, shell-and-tube) and their protective features.

Warnings and Alerts

Explanation of LED indicators and codes for module status, warnings, and alerts.

Unit Maintenance

Filter-Driers

R-410A Refrigerant

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

Refrigerant Charging

Detailed steps for trimming charge, checking superheat, and subcooling for R-410A.

Routine Quarterly Cleaning of ElectroFin Coated Coil Surfaces

POE Lubricants

Information on POE oil, its properties, handling precautions, and acceptable types.

Compressor Maintenance

System Adjustment

Importance of adjusting superheat and subcooling for peak performance.

All-Aluminum Condenser Coils

Liquid Line Sight Glass

Cleaning Microchannel Aluminum Coils

Expansion Valve

Cleaning ElectroFin® Coated Coils

High Ambient Control Panel

Troubleshooting Chart

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

Warranty Registration Form (Scroll)

III . REFRIGERATION SYSTEM

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

Fields to record MicroTech status readings and verify them with field instruments.

VI . MICROTECH SETPOINTS

Fields to record MicroTech setpoints for various parameters like LWT, pressure, and delays.

II . Pre Start-Up Checklist

Checklist of essential checks to be performed before unit startup for warranty validation.

V . START-UP

Limited Product Warranty

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

Company's warranty statement for products sold in North America, covering defects in material or workmanship.

EXCEPTIONS

SOLE REMEDY

Statement defining the owner's sole remedy and disclaiming implied warranties and consequential damages.

Warranty

Reference to standard terms and conditions of sale, including the Limited Product Warranty.

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Daikin AGZ070E User Manual

Table of Contents

Questions and Answers:

Daikin AGZ070E Specifications

Summary

Pre-Start Checklist

Pre-Start Checklist – Scroll Compressor Chillers

Installation and Application Information

Operating and Standby Limits

Case 5: Pit Installation

Low Ambient Operation

Unit Placement

High Ambient Operation

Service Clearance

Chilled Water Piping

Field installed water piping to the chiller must include

Inlet Strainer Guidelines

Inlet Strainer Guidelines

Evaporator Freeze Protection

Evaporator Freeze Protection

Chilled Water Pump

Chilled Water Pump

Flow Switch

Flow Switch

Glycol Solutions

Glycol Solutions

Condenser Coil Options and Coating Considerations

Condenser Coil Options and Coating Considerations

Refrigerant Schematics

Refrigerant Schematics

Dimensions and Weights - Packaged Units

Dimensions and Weights - Packaged Units

Isolator Information

Isolator Information

Pressure Drop Data

Pressure Drop Data

Electrical Data Notes

Electrical Data Notes

Electrical Data

Panel High Short Circuit Current Rating

Typical Field Wiring Diagram (Single-Point Connection)

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

Table 16: 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)

Electrical Control Center

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

Table 17: Electrical Data - Single Point (60/50 Hz)

Unit Controller Operation

EXV Module 1 and 2

Dynamic Set Point Ranges

Table 47: Commincation Configuration

Dynamic Set Point Ranges and Defaults

Condenser Fan Output Labels

RapidRestore®

RapidRestore®

Set Points

Set Points

Circuit Level Set Points

Circuit Level Set Points

Sequence of Operation

Unit Sequence of Operation - Cool Mode

Unit Sequence of Operation - Cool Mode (continue)

Unit Sequence of Operation - Ice Mode

Unit Sequence of Operation - Ice Mode (continue)

Unit Sequence of Operation - Ice Mode (continued)

Unit Functions

Unit Enable

Leaving Water Temperature (LWT) Reset

RapidRestore® Option

Compressor Starts Per Hour

Evaporator Pump Control

Unit Mode Selection

Freeze Protection

Fast Loading

Sound Reduction

Pump Selection

Network Limit