Daikin AGZ030E User manual

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

IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS 2 www.DaikinApplied.com
Table of ConTenTs
Manufactured in an ISO 9001 & ISO 14001 certied facility
©2016 Daikin Applied. Illustrations and data cover the Daikin Applied product at the time of publication and we reserve the right to
make changes in design and construction at any time without notice.
Table of ConTenTs
Installation and Application Information ..........3
Refrigerant Schematics .......................15
Dimensions and Weights - Packaged Units ......20
Refrigerant Charge...........................28
Isolator Information ..........................29
Pressure Drop Data ..........................32
Electrical Data...............................35
Unit Controller Operation .....................43
Sequence of Operation .......................54
Unit Functions ..............................61
Circuit Functions ............................70
Alarms .....................................79
Using the Controller..........................83
Optional Low Ambient Fan VFD ................86
Startup and Shutdown Procedures .............92
Component Operation ........................94
Unit Maintenance ............................96
Troubleshooting Chart ......................102
Warranty Registration Form (Scroll)............104
Limited Product Warranty ....................109
Table of ConTenTs

Cut Here 
Pre-Start Checklist – Scroll Compressor Chillers
Must be completed, signed and provided to Daikin Applied at least 2 weeks prior to requested start date.
Job Name
Installation Location
Customer Order Number
Model Number(s)
G.O. Number(s)
Chilled Water
Yes
No
N/A
Initials
Piping Complete
Water strainer : Shell & Tube Evaporators 0.125”(3.175mm) or smaller perforations
Brazed Plate Evaporator 0.063” (1.6mm) or smaller perforations
Water System filled, flushed and vented
Pumps installed and operational (rotation checked, strainers cleaned)
Controls operational (3-way valves, face/bypass dampers, bypass valves, etc.)
Water system operated and tested; flow meets unit design requirements
Flow switch installed and wired
Vent installed on evaporator
Glycol at design %
Electrical
Yes
No
N/A
Initials
Building controls operational
*Power leads connected to power block or optional disconnect
Power leads have been checked for proper phasing and voltage
All interlock wiring complete and compliant with Daikin specifications
Power applied at least 24 hours before startup
Oil heaters energized at least 24 hours before startup
Chiller components (EXV Sensors Transducers) installed and wired properly.
*Wiring complies with National Electrical Code and local codes (See Notes)
Remote EXV wired with shielded cable
Miscellaneous
Yes
No
N/A
Initials
Unit control switches all off
Remote Evaporator /Condenser Piping factory reviewed
All refrigerant components/piping leak tested, evacuated and charged
Thermometers, wells, gauges, control, etc., installed
Minimum system load of 80% capacity available for testing/adjusting controls
Document Attached: Technical Breakdown from Selection Software
Document Attached: Final Order Acknowledgement
Document Attached: Remote piping approval
Notes: The most common problems delaying start-up and affecting unit reliability are:
1. Field installed compressor motor power supply leads too small. Questions: Contact the local Daikin sales representative*. State size, number and
type of conductors and conduits installed:
a. From Power supply to chiller
* Refer to NEC Article 430-22 (a)
2. Remote Evaporator piping incomplete or incorrect. Provide approved piping diagrams.
3. Items on this list incorrectly acknowledged resulting in delayed start and possible extra expenses incurred by return trips.
Contractor Representative
Daikin Applied Sales Representative
Signed:
Signed:
Name:
Name:
Company:
Company:
Date:
Date:
Phone/Email:
Phone/Email:
©2013 Daikin Applied Form SF01017 P/N 331977001 22OCT2013

InsTallaTIon and applICaTIon InformaTIon
www.DaikinApplied.com 3 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
InsTallaTIon and applICaTIon InformaTIon
General Description
Daikin Trailblazer™air-cooled water chillers are complete, self-
contained, automatic chillers designed for outdoor installation.
Packaged units are completely assembled, factory wired,
charged, and tested.
The electrical control center includes all equipment protection
and operating controls necessary for dependable automatic
operation.
NOMENCLATURE
A G Z XXX E D SM
WARNING
Installation is to be performed by qualied personnel who are
familiar with local codes and regulations.
Additional Manual
This manual covers the installation, of dual circuit, AGZ-EH
packaged, scroll compressor chillers using R-410A.
Information for units with either the pump package or remote
evaporator options can be found at www.DaikinApplied.com.
Inspection
Check all items carefully against the bill of lading. Inspect
all units for damage upon arrival. Report shipping damage
and le a claim with the carrier. Check the unit nameplate
before unloading, making certain it agrees with the power
supply available. Daikin Applied is not responsible for physical
damage after the unit leaves the factory.
Handling
Be careful to avoid rough handling of the unit. Do not push
or pull the unit from anything other than the base. Block the
pushing vehicle away from the unit to prevent damage to the
sheet metal cabinet and end frame (see Figure 1).
To lift the unit, 2-1/2” (64mm) diameter lifting eyes are provided
on the base of the unit. Arrange spreader bars and cables to
prevent damage to condenser coils or cabinet (see Figure 2).
CAUTION
All lifting locations must be used to prevent damage to unit.
DANGER
Improper rigging, lifting, or moving of a unit can result in
property damage, severe personal injury or death. Follow
rigging and moving instructions carefully. Do not stand
beneath the unit while it is lifted or being installed.
Figure 1: Suggested Pushing Arrangment
Figure 2: Required Lifting Arrangement
CAUTION
Sharp edges and coil surfaces are a potential injury hazard.
Avoid contact with them.
Air-Cooled
Global Design
Scroll Compressor
Application
SM = Standard Efciency Packaged Unit
HM = High Efciency Packaged Unit
Design Vintage
Nominal Tons
Blocking is required
across full width
SPREADER BARS
REQUIRED FOR
EACH PAIR OF
LIFTING LUGS
(USE CAUTION)
MUST USE THESE
RIGGING HOLES
(BE AWARE OF
CONTROL BOX
LOCATION)
Number of fans and
rigging holes may vary
from this diagram.
The lifting method will
remain the same.
# of Compressors
D = Tandem per Circuit
T = Trio per Circuit

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InsTallaTIon and applICaTIon InformaTIon
Operating and Standby Limits
Table 1: Operating Limits
Maximum standby ambient temperature 131°F (55°C)
Maximum operating ambient temperature 105°F (41°C)
-with optional high ambient package (see information under High Ambient Operation) 125°F (52°C)
Minimum operating ambient temperature (standard control) 32°F (0°C)
Minimum operating ambient temperature (with optional low-ambient control) -10°F (-23°C)
Leaving chilled water temperature 40°F to 65°F (4°C to 18°C)
Leaving chilled uid temperatures (with anti-freeze) - Note that in cases of high ambient
temperature, the lowest leaving water temperature settings may be outside of the chiller
operating envelope; consult Daikin Tools to ensure chiller is capable of the required lift.
15°F to 65°F (-9°C to 18°C)
Operating chilled water delta-T range 6°F to 16°F (3.3°C to 8.9°C)
Maximum evaporator operating inlet uid temperature 81°F (27°C)
Maximum evaporator non-operating inlet uid temperature 100°F (38°C)
Unit Placement
Trailblazer™units are for outdoor applications and can be
mounted either on a roof or at ground level. For roof mounted
applications, install the unit on a steel channel or I-beam
frame to support the unit above the roof. For ground level
applications, install the unit on a substantial base that will not
settle. Use a one-piece concrete slab with footings extended
below the frost line. Be sure the foundation is level within 0.5”
(13 mm) over its length and width. The foundation must be
strong enough to support the unit weight - see “Dimensions
and Weights - Packaged Units” on page 20.
Service Clearance
Sides
• 30-70 Ton Models: Minimum of 4 feet (1.2 meters)
• 75-240 Ton Models: It is highly recommended to
provide a minimum of 8 feet (2.4 meters) on one side to
allow for coil replacement. Coils can be removed from
the top, allowing a minimum of 4 feet (1.2 meters) of
side clearance; however, the unit performance may be
derated.
Control Panel End
• All Models: Minimum of 4 feet (1.2 meters)
Opposite Control Panel End
• 30-70 Ton Models with Microchannel Coils: Minimum
of 7.5 feet (2.3 meters)
• 75-180 Ton Models: Minimum of 4 feet (1.2 meters)
• 190-240 Ton Models: Minimum of 8 feet (2.4 meters) for
evaporator removal
Figure 3: Service Clearance
Spacing Requirements
Sufcient clearance must be maintained between the unit
and adjacent walls or other units to allow the required unit air
ow to reach the coils. Failure to do so will result in a capacity
reduction and an increase in power consumption. No solid
obstructions are allowed above the unit at any height, see page
7for details.
Graphs on the following pages give the minimum clearance
for different types of installations and also capacity reduction
and power increase if closer spacing is used. The clearance
requirements shown are a general guideline and cannot
account for all scenarios. Such factors as prevailing winds,
additional equipment within the space, design outdoor air
temperature, and numerous other factors may require more
clearance than what is shown.
Minimum = 4 ft (1.2 m)
Minimum = 4 ft (1.2 m)
Minimum = 4 ft
(1.2 m)
Minimum = 7.5 ft (2.3 m)
for models 030-070
with Microchannel Coils
Control Panel
Minimum = 4 ft (1.2 m)
for models 075-180
075-240 Ton Models: 8ft (2.4 m) recommended on one side
Minimum = 8 ft (2.4 m)
for models 190-240

InsTallaTIon and applICaTIon InformaTIon
www.DaikinApplied.com 5 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Case 1: Building or Wall on One Side of Unit
NOTE: Assumes a solid height wall taller than unit. Refer to
Case 4 for partial wall openings.
For models AGZ030-100E, maintain a 4 feet minimum from a
wall of any height.
For models AGZ110-130E, maintain a 6 feet minimum from a
wall of any height.
For models AGZ140-240E, maintain a 8 feet minimum from a
wall of any height.
Figure 4: Building or Wall on One Side of Unit
Case 2: Two Units, Side-by-Side
For models 030-180, there must be a minimum of 4 feet
between two units placed side-by-side; however, performance
may be affected at this distance. For models 190-240,
the minimum is 6 feet as closing spacing may cause air
recirculation and elevated condenser pressure. Assuming
the requirement of one side having at least 8 feet of
service clearance is met, Case 2 gures show performance
adjustments as the distance between two units increases.
Figure 5: Two Units, Side-by-Side
Figure 6: Case 2 - Full Load Capacity Reduction
Figure 7: Case 2 - Power Increase
Height
of
Wall
Distance
Between
Wall
and
Unit
D
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4568
% Capacity Reduction
Distance Between Units (ft)
Full Load Capacity Reduction
AGZ030-070E AGZ075-100E
AGZ110-130E AGZ140-180E
AGZ190-210E AGZ225-240E
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
4568
% Power Increase
Distance Between Units (ft)
Power Increase
AGZ030-070E AGZ075-100E
AGZ110-130E AGZ140-180E
AGZ190-210E AGZ225-240E

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InsTallaTIon and applICaTIon InformaTIon
Case 3: Three or More Units, Side-by-Side
For all models, there must be a minimum distance between
any units placed side-by-side; however, performance may be
affected at this distance. Minimum distances are: models 030
to 070 - 4 feet, models 075 to 100 - 5 feet, models 110 to 240
- 6 feet. Figure 9 and Figure 10 depict Case 3 performance
adjustments as the distance between units increases.
NOTE: Data in Figure 9 and Figure 10 is for the middle unit
with a unit on each side. See Case 2 adjustment
factors for the two outside units.
Figure 8: Three or More Units, Side-by-Side
Figure 9: Case 3 - Full Load Capacity Reduction
Figure 10: Case 3 - Power Increase
Case 4: Open Screening Walls
Decorative screening walls are often used to help conceal a
unit either on grade or on a rooftop. When possible, design
these walls such that the combination of their open area
and distance from the unit (see Figure 11) do not require
performance adjustment. If the wall opening percentage is less
than recommended for the distance to the unit, it should be
considered as a solid wall. It is assumed that the wall height is
equal to or less than the unit height when mounted on its base
support. If the wall height is greater than the unit height, see
Case 5: Pit Installation for performance adjustment factors.
The distance from the sides of the unit to the side walls must
be sufcient for service, such as opening control panel doors.
For uneven wall spacing, the distance from the unit to each
wall can be averaged providing no distance is less than 4 feet.
Values are based on walls on all four sides.
Figure 11: Case 4 - Allowable Wall Open Area
0.0
1.0
2.0
3.0
4.0
5.0
6.0
4568
% Capacity Reduction
Distance Between Units
Full Load Capacity Reduction
AGZ030-035E AGZ040-070E AGZ075-100E
AGZ0110-130E AGZ140-180E AGZ190-210E
AGZ225-240E
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
4568
% Power Increase
Distance Between Units (ft)
Power Increase
AGZ030-035E AGZ040-070E AGZ075-100E
AGZ0110-130E AGZ140-180E AGZ190-210E
AGZ225-240E
3.0
4.0
5.0
6.0
7.0
8.0
9.0
010 20 30 40 50
Distance from Wall to Unit (ft)
% Open Wall Area
Wall Free Area vs. Distance
AGZ030-070E AGZ075-100E
AGZ110-130E AGZ140-180E
AGZ190-240E

InsTallaTIon and applICaTIon InformaTIon
www.DaikinApplied.com 7 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Case 5: Pit Installation
Pit installations can cause operating problems resulting from
air recirculation and restriction and require care that sufcient
air clearance is provided, safety requirements are met and
service access is provided. A solid wall surrounding a unit is
substantially a pit and this data should be used.
Steel grating is sometimes used to cover a pit to prevent
accidental falls or trips into the pit. The grating material
and installation design must be strong enough to prevent
such accidents, yet provide abundant open area to avoid
recirculation problems. Have any pit installation reviewed by
the Daikin Applied sales representative prior to installation to
ensure it has sufcient air-ow characteristics and approved by
the installation design engineer to avoid risk of accident.
Models AGZ030-070E:
The Case 5 gures for models AGZ030-070E show adjustment
factors for pit/wall heights of 4 feet, 5 feet, and 6 feet.
Figure 12: Case 5 - Full Load Capacity Reduction
(AGZ030E-070E)
Figure 13: Case 5 - Power Increase (AGZ030-070E)
Figure 14: Case 5 - Pit Installation
Models AGZ075-130E:
The Case 5 gures for models AGZ075-130E show adjustment
factors for pit/wall heights of 5 feet, 6 feet, and 8 feet.
Figure 15: Case 5 - Full Load Capacity Reduction
(AGZ075-130E)
Figure 16: Case 5 - Power Increase (AGZ075-130E)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
8
10
12
13
14
% Capacity Reduction
Depth of Pit / Wall Height (ft)
Full Load Capacity Reduction (AGZ030-070E)
Dis tanc e = 4 f t
Dis tanc e = 5 f t
Dis tanc e = 6 f t
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0
8
10
12
13
14
% Power Increase
Depth of Pit / Wall Height (ft)
Power Increase (AGZ030-070E)
Dis tanc e = 4 f t
Dis tanc e = 5 f t
Dis tanc e = 6 f t
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
8
10
12
13
14
% Capacity Reduction
Depth of Pit / Wall Height ft)
Full Load Capacity Reduction (AGZ075-130E)
Dis tanc e = 5 f t
Dis tanc e = 6 f t
Dis tanc e = 8 f t
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0
8
10
12
13
14
% Power Increase
Depth of Pit / Wall Height (ft)
Power Increase (AGZ075-130E)
Dis tanc e = 5 f t
Dis tanc e = 6 f t
Dis tanc e = 8 f t

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InsTallaTIon and applICaTIon InformaTIon
Models AGZ140-240E:
The Case 5 gures for models AGZ140-240E show adjustment
factors for pit/wall heights of 6 feet, 8 feet, and 10 feet.
Figure 17: Case 5 - Full Load Capacity Reduction
(AGZ140-180E)
Figure 18: Case 5 - Full Load Capacity Reduction
(AGZ190-240E)
Figure 19: Case 5 - Power Increase (AGZ140-210E)
Figure 20: Case 5 - Power Increase (AGZ225-240E)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0 8 10 12 13 14
% Capacity Reduction
Depth of Pit / Wall Height (ft)
Full Load Capacity Reduction (AGZ140-180E)
Distance = 6 ft Distance = 8 ft Distance = 10 ft
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
0 8 10 12 13 14
% Capacity Reduction
Depth of Pit / Wall Height (ft)
Full Load Capacity Reduction (AGZ190-240E)
Distance = 6 ft Distance = 8 ft Distance = 10 ft
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0 8 10 12 13 14
% Power Increase
Depth of Pit / Wall Height (ft)
Power Increase (AGZ140-210E)
Distance = 6 ft Distance = 8 ft Distance = 10 ft
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
0 8 10 12 13 14
% Power Increase
Depth of Pit / Wall Height (ft)
Power Increase (AGZ225-240E)
Distance = 6 ft Distance = 8 ft Distance = 10 ft

InsTallaTIon and applICaTIon InformaTIon
www.DaikinApplied.com 9 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Chilled Water Piping
CAUTION
To prevent damage to the evaporator and potential chiller
failure, a supply strainer is required in the inlet water piping
which connects to this evaporator. This strainer must be
installed prior to operation of the chilled liquid pumps.
Field installed water piping to the chiller must include:
• A cleanable strainer installed at the water inlet to the
evaporator to remove debris and impurities before they
reach the evaporator. Install cleanable strainer within
5 feet (1500 mm) of pipe length from the evaporator
inlet connection and downstream of any welded
connections (no welded connections between strainer
and evaporator).
• AGZ-E models 030-180 require a strainer with
perforations no larger than 0.063” (1.6 mm) diameter and
models 190-240 require a strainer with perforations no
larger than 0.125” (3.175 mm) diameter. See the Inlet
Strainer Guidelines on page 10 for more information.
• A water ow switch must be installed in the horizontal
piping of the supply (evaporator outlet) water line to avoid
evaporator freeze-up under low or no ow conditions. The
ow switch may be ordered as a factory-installed option,
a eld-installed kit, or may be supplied and installed in the
eld. See page 12 for more information.
• Piping for units with brazed-plate evaporators must have
a drain and vent connection provided in the bottom of
the lower connection pipe and to the top of the upper
connection pipe respectively, see Figure 21. These
evaporators do not have drain or vent connections due
to their construction. Purge air from the water system
before unit start-up to provide adequate ow through the
evaporator.
• Adequate piping support, independent from the unit,
to eliminate weight and strain on the ttings and
connections.
It is recommended that the eld installed water piping to the
chiller include:
• Thermometers at the inlet and outlet connections of the
evaporator.
• Water pressure gauge connection taps and gauges at
the inlet and outlet connections of the evaporator for
measuring water pressure drop.
• Shutoff valves are necessary to isolate the unit from the
piping during unit servicing.
• Minimum bends and changes in elevation to minimize
pressure drop.
• An expansion tank or regulating valve to maintain
adequate water pressure
• Vibration eliminators in both the supply and return water
lines to reduce transmissions to the building.
• Flush the system water piping thoroughly before making
connections to the unit evaporator.
• Piping insulation, including a vapor barrier, helps prevent
condensation and reduces heat loss.
• Regular water analysis and chemical water treatment
for the evaporator loop is recommended immediately at
equipment start-up.
NOTE: Failure to follow these measures may result in
performance and reliability issues.
WARNING
Daikin Applied recommends against the use of PVC and
CPVC piping for chilled water systems. In the event the pipe
is exposed to POE oil used in the refrigerant system, the pipe
can be chemically damaged and pipe failure can occur.
Figure 21: Typical Piping, Brazed-Plate Evaporator
Air
Vent
Flow
Switch
Vibration
Eliminators
Drain
Outlet
Inlet
P
Isolation
Valves
Strainer
WELDED PIPE CONNECTIONS ARE NOT ALLOWED
BETWEEN THE STRAINER AND EVAPORATOR DUE
TO THE CHANCE OF SLAG ENTERING THE EVAPORATOR

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InsTallaTIon and applICaTIon InformaTIon
Figure 22: Typical Piping, Shell and Tube Evaporator
Inlet Strainer Guidelines
An inlet water strainer kit must be installed in the chilled water
piping before the evaporator inlet. Several paths are available
to meet this requirement:
1. Factory installed option is available - models 030 to 180.
2. A eld-installed kit shipped-loose with the unit is available
for all unit sizes and consists of:
• Y-type area strainer with 304 stainless steel perforated
basket, Victaulic pipe connections and strainer cap [a
strainer with perforations no larger than 0.063” (1.6
mm) diameter for AGZ-E models 030-180, a strainer
with perforations no larger than 0.125” (3.175 mm)
diameter for AGZ-E models 190-240].
• Extension pipe with two Schrader ttings that can be
used for a pressure gauge and thermal dispersion ow
switch. The pipe provides sufcient clearance from the
evaporator for strainer basket removal.
• ½-inch blowdown valve
• Two grooved clamps
Both are sized per Table 2 and with the pressure drop shown in
the Strainer Pressure Drop graph. Connection sizes are given
in the Dimensions and Weights section on page 20.
3. A eld-supplied strainer that meets specication and
installation requirements of this manual.
Table 2: Strainer Data
Trailblazer™
Model
Strainer Size
in (mm)
Minimum
perforation size
in (mm)
Factory
Installed
Option
Field
Installed
Option
030-070E 2.5 (64) 0.063 (1.6) Y Y
075-130E 3.0 (76) 0.063 (1.6) Y Y
140-180E 4.0 (102) 0.063 (1.6) Y Y
190-240E 8.0 (203) 0.125 (3.175) N Y
Figure 23: Factory Installed Strainer
Figure 24: Strainer Pressure Drop
LEAVING FLUID
TEMP. SENSOR
VENT
3/8” PIPE PLUG
VIBRATION
ELIMINATOR
FLOW
SWITCH
GATE
VALVE
FLOW
FLOW
GATE
VALVE
OUTLET
DRAIN
BALANCING
VALVE
VIBRATION
ELIMINATOR
WATER
STRAINER
VALVED
PRESSURE
GAUGE
PROTECT ALL FIELD PIPING
AGAINST FREEZING
INLET
WELDED PIPE CONNECTIONS ARE NOT ALLOWED
BETWEEN THE STRAINER AND EVAPORATOR DUE TO THE
CHANCE OF SLAG ENTERING THE EVAPORATOR
2.5 in 3.0 in 4.0 in
8.0 in.
0.1
1.0
10.0
100.0
10.0 100.0 1000.0
Pressure Drop ( ft)
Flow Rate (gpm)

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www.DaikinApplied.com 11 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Water Flow Limitations
Constant Evaporator Flow
The evaporator ow rates and pressure drops shown on page
33 for various system designs. The maximum ow rate and
pressure drop are based on a 6°F temperature drop. Flow
rates above the maximum values will result in unacceptable
pressure drops and can cause excessive erosion, potentially
leading to failure.
The minimum ow and pressure drop is based on a full load
evaporator temperature drop of 16°F. Evaporator ow rates
below the minimum values can result in laminar ow causing
low pressure alarms, scaling and poor temperature control.
Variable Evaporator Flow
Reducing evaporator ow in proportion to load can reduce
system power consumption. The rate of ow change should be
a maximum of 10 percent of the ow per minute. For example,
if the maximum design ow is 200 gpm and it will be reduced to
a ow of 140 gpm, the change in ow is 60 gpm. Ten percent of
200 gpm equals 20 gpm change per minute, or a minimum of
three minutes to go from maximum to desired ow. The water
ow through the evaporator must remain between the minimum
and maximum values listed in Table 11 on page 33. If ow
drops below the minimum allowable, large reductions in heat
transfer can occur. If the ow exceeds the maximum rate,
excessive pressure drop and tube erosion can occur. See unit
set point information in See Variable Evaporator Flow on page
61.
System Water Considerations
All chilled water systems need adequate time to recognize
a load change, respond to the change and stabilize to avoid
undesirable short cycling of the compressors or loss of
temperature control. In air conditioning systems, the potential
for short cycling usually exists when the building load falls
below the minimum chiller plant capacity or on close-coupled
systems with very small water volumes. Some of the things
the designer should consider when looking at water volume
are the minimum cooling load, the minimum chiller plant
capacity during the low load period and the desired cycle time
for the compressors. Assuming that there are no sudden load
changes and that the chiller plant has reasonable turndown,
a rule of thumb of “gallons of water volume equal to two to
three times the chilled water gpm ow rate” is often used. A
storage tank may have to be added to the system to reach the
recommended system volume. Refer to AG 31-003 for method
of calculating “Minimum Chilled Water Volume”.
The water quality provided by the owner/occupant/operator/
user to a chiller system should minimize corrosion, scale
buildup, erosion, and biological growth for optimum efciency
of HVAC equipment without creating a hazard to operating
personnel or the environment. Water systems should be
cleaned and ushed prior to the chiller installation. Water
testing and treatment should be veried during initial chiller
installation/commissioning and maintained on a continuous
basis by water treatment professionals (see Limited Product
Warranty on inside of back cover).
CAUTION
The use of detergents, chemicals, and additives in the chiller
system water may adversely affect chiller performance and
potentially lead to repair costs not covered by warranty.
Any decision to use these products is at the discretion of
the owner/occupant/operator/user as such they assume full
liability/responsibility for any damage that may occur due to
their use.
Evaporator Freeze Protection
Evaporator freeze-up can be a concern in the application of
air-cooled water chillers in areas experiencing below freezing
temperatures. To protect against freeze-up, insulation and an
electric heater are furnished with the evaporator. Models 030
through 180 have an external plate heater and thermostat.
Models 190 through 240 have immersion heaters with a
thermostat. These heaters help protect the evaporator down to
-20°F (-29°C) ambient air temperature. The evaporator heater
cable is factory wired to the 115 volt control circuit transformer
in the control box. A 115V power source for the heater and
controls may also be supplied from a separate power feed to
maximize unit protection if desired. Refer to the eld wiring
diagram on page 35 for additional information on supplying a
separate 115V power feed.
Operation of the heaters is automatic through the sensing
thermostat that energizes the evaporator heaters for protection
against freeze-up. Unless the evaporator is drained in the
winter or contains an adequate concentration of anti-freeze, the
disconnect switch to the evaporator heater must not be open.
Although the evaporator is equipped with freeze protection,
it does not protect water piping external to the unit or the
evaporator itself if there is a power failure or heater burnout, or
if the chiller is unable to control the chilled water pumps. Use
one of the following recommendations for additional freeze
protection:
1. If the unit will not be operated during the winter, drain the
evaporator and chilled water piping and ush with glycol.
2. Add a glycol solution to the chilled water system. Burst
protection should be approximately 10°F below minimum
design ambient temperature.
3. Insulate the exposed piping.
4. Add thermostatically controlled heat by wrapping the
lines with heat tape.
5. When glycol is added to the water system for freeze
protection, the refrigerant suction pressure will be lower,
cooling performance less, and water side pressure drop
greater. If the percentage of glycol is high, or if propylene
is used instead of ethylene glycol, the added pressure
drop and loss of performance could be substantial. When
Glycol or Ice are selected as Unit Mode, the MicroTech®
III control will automatically reset the available range
for the Leaving Water Temperature, Freezestat and
Evaporator Pressure settings.

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InsTallaTIon and applICaTIon InformaTIon
Chilled Water Pump
It is important that the chilled water pumps be wired to, and
controlled by, the chiller’s microprocessor. When equipped
with optional dual pump output, the chiller controller has the
capability to selectively send the signal to a pump relay (by
others) to start pump A or B or automatically alternate pump
selection and also has standby operation capability. The
controller will energize the pump whenever at least one circuit
on the chiller is enabled to run, whether there is a call for
cooling or not. This helps ensure proper unit start-up sequence.
he pump will also be turned on when the water temperature
goes below the Freeze Setpoint for longer than a specied time
to help prevent evaporator freeze-up. Connection points are
shown in the Field Wiring Diagram beginning on page 35.
CAUTION
Adding glycol or draining the system is the recommended
method of freeze protection. If the chiller does not have
the ability to control the pumps and the water system is
not drained in temperatures below freezing, catastrophic
evaporator failure may occur.
Failure to allow pump control by the chiller may cause the
following problems:
1. If any device other than the chiller attempts to start the
chiller without rst starting the pump, the chiller will lock
out on the No Flow alarm and require manual reset.
2. If the chiller evaporator water temperature drops below
the “Freeze setpoint” the chiller will attempt to start the
water pumps to avoid evaporator freeze. If the chiller
does not have the ability to start the pumps, the chiller
will alarm due to lack of water ow.
3. If the chiller does not have the ability to control the
pumps and the water system is not to be drained in
temperatures below freezing or contain glycol, the chiller
may be subject to catastrophic evaporator failure due to
freezing. The freeze rating of the evaporator is based on
the evaporator heater and pump operation. The external
brazed plate heater or shell and tube immersion heater
itself may not be able to properly protect the evaporator
from freezing without circulation of water.
Flow Switch
All chillers require a chilled water ow switch to check that
there is adequate water ow through the evaporator ant to shut
the unit down if there isn’t. There are two options for meeting
this requirement.
1. A factory-mounted thermal dispersion ow switch.
2. A “paddle” type ow switch is available from Daikin
Applied for eld mounting and wiring. Wire from switch
terminals Y and R to the unit control panel terminals
shown on the eld wiring diagrams, page 35 and page
36. Mount the ow switch in the leaving water line to
shut down the unit when water ow is interrupted. A ow
switch is an equipment protection control and should
never be used to cycle a unit.
Installation should be per manufacturer’s instructions included
with the switch. Flow switches should be calibrated to shut off
the unit when operated below the minimum listed ow rate for
the unit as listed on page 33.
There is also a set of normally closed contacts on the switch
that can be used for an indicator light or an alarm to indicate
when a “no ow” condition exists. Freeze protect any ow
switch that is installed outdoors. Differential pressure switches
are not recommended for outdoor installation. They can freeze
and not indicate a no-ow conditions.
Glycol Solutions
The use of a glycol/water mixture in the evaporator to prevent
freezing will reduce system capacity and efciency, as well
as increase pressure drop. The system capacity, required
glycol solution ow rate, and pressure drop with glycol may be
calculated using the following formulas and tables.
Glycol Flow Rate = Capacity Tons X Flow Correction Factor
(gpm) 0.00429 x ΔT
1. Capacity - Multiply the capacity based on water by the
Capacity correction factor from Table 3 or Table 4.
2. Flow - Multiply the water evaporator ow by the Flow
correction factor from Table 3 or Table 4 to determine
the increased evaporator ow due to glycol. If the ow is
unknown, it can be calculated from the above equation.
3. Pressure drop - Multiply the water pressure drop from
Table 11 by Pressure Drop correction factor from Table
3or Table 4. High concentrations of propylene glycol at
low temperatures may cause unacceptably high pressure
drops.
4. Power - Multiply the water system power by Power
correction factor from Table 3 or Table 4.

InsTallaTIon and applICaTIon InformaTIon
www.DaikinApplied.com 13 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Test coolant with a clean, accurate glycol refractometer to
determine the freezing point. Obtain percent glycol from the
freezing point table below. It is recommended that a minimum
of 25% solution by weight be used for protection against
corrosion or that additional compatible inhibitors be added.
Concentrations above 35% do not provide any additional burst
protection and should be carefully considered before using.
Reset the freezestat setting to 6 °F (3.3 °C) below the leaving
chilled water setpoint temperature after the glycol percentage
is veried safe for the application.
CAUTION
Do not use an automotive-grade antifreeze. Industrial
grade glycols must be used. Automotive antifreeze contains
inhibitors which will cause plating on the copper tubes within
the chiller evaporator. The type and handling of glycol used
must be consistent with local codes.
Table 3: Ethylene Glycol Factors
E.G. Freeze Point Cap Power Flow PD
% °F °C
10 26 -3.3 0.997 0.999 1.028 1.090
20 18 -7.8 0.993 0.997 1.059 1.216
30 7 -14 0.987 0.995 1.094 1.379
40 -7 -22 0.981 0.993 1.132 1.557
50 -28 -33 0.972 0.990 1.174 1.811
Table 4: Propylene Glycol Factors
P.G. Freeze Point Cap Power Flow PD
% °F °C
10 26 -3.3 0.995 0.998 1.011 1.025
20 19 -7.2 0.988 0.995 1.030 1.150
30 9 -13 0.979 0.992 1.056 1.375
40 -5 -21 0.968 0.988 1.090 1.701
50 -27 -33 0.955 0.983 1.131 2.128
Low Ambient Operation
Compressor staging is adaptively determined by system load,
ambient air temperature, and other inputs to the MicroTech®III
control. The standard minimum ambient temperature is 32°F
(0°C). A low ambient option with fan VFD allows operation
down to -10°F (-23°C). The minimum ambient temperature
is based on still conditions where the wind is not greater
than 5 mph. Greater wind velocities will result in reduced
discharge pressure, increasing the minimum operating
ambient temperature. Field installed louvers are available and
recommended to help allow the chiller to operate effectively
down to the ambient temperature for which it was designed.
High Ambient Operation
Trailblazer™units for high ambient operation (105°F to 125°F,
40°C to 52°C) require the addition of the optional high ambient
package that includes a small fan with a lter in the air intake
to cool the control panel.
All units with the optional VFD low ambient fan control
automatically include the high ambient option. Note that in
cases of high ambient temperature, capacity could be reduced
or the lowest leaving water temperature settings may be
outside of the chiller operating envelope; consult with a Daikin
Applied sales representative to ensure chiller is capable of the
required lift.

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InsTallaTIon and applICaTIon InformaTIon
Condenser Coil Options and Coating
Considerations
The standard coils on the Trailblazer™chiller are an all
aluminum alloy microchannel design with a series of at
tubes containing multiple, parallel ow microchannels layered
between the refrigerant manifolds. The microchannel coils are
designed to withstand 1000+ hour acidied synthetic sea water
fog (SWAAT) test (ASTM G85-02) at 120°F (49°C) with 0% n
loss and develop no leaks.
Should the standard microchannel coil not meet the corrosion
requirements for the application, additional coil options are
available.
Aluminum n/copper tube coils consist of 3/8 inch (10 mm)
seamless copper tubes mechanically bonded into plate-type
aluminum ns. The ns have full drawn collars to completely
cover the tubes. The aluminum n/copper tube option is best
suited for non-corrosive environments, and can be repaired
onsite. This option is only available for models AGZ030-070E.
Figure 25: Aluminum Fin/Copper Tube Coils
BlackFin™ coils include aluminum ns pre-coated with a
durable phenolic epoxy coating. In addition to providing a
durable coating on the n material, the BlackFin™ coils provide
and epoxy barrier between the aluminum n stock and the
copper tube, to prevent the galvanic corrosion that can occur
between the dissimilar metals. This option will provide a 1000+
hour salt spray rating per ASTM B117-90. The BlackFin™
option provides enhanced protection in mildly corrosive
environments. This option is only available for models AGZ030-
070E.
Copper-n coils consist of 3/8 inch (10 mm) seamless copper
tubes mechanically bonded into plate-type copper ns. The ns
have full drawn collars to completely cover the tubes. Since
the n and the tube materials are similar, the opportunity for
galvanic corrosion is eliminated. The copper n/copper tube
option may be used in marine environments; however this
option is not well suited for industrial or chemical atmospheric
contamination. This option is only available for models
AGZ030-070E.
ElectroFin® coil coating is a water-based extremely exible
and durable epoxy polymer coating uniformly applied to all
coil surfaces through a multi-step, submerged electrostatic
coating process. ElectroFin®condenser coils provide a 5000+
hour salt spray resistance per ASTM B117-90, applied to both
the coil and the coil frames. The ElectroFin®coated coils also
receive a UV-resistant urethane top-coat to provide superior
resistance to degradation from direct sunlight. This coil coating
option provides the best overall protection against corrosive
marine, industrial or combined atmospheric contamination.
This coating option may be applied to any of the untreated coil
options offered, to provide excellent longevity and resistance to
corrosion.
Table 5: Coil/Coating Selection Matrix
Coil Option Non-
Corrosive1
Unpolluted
Marine2Industrial3
Combined
Marine-
Industrial4
Standard Microchannel +++ - - -
Alum. Fin/Copper Tube5+++ - - -
Copper Fin/Copper Tube5+++ +++ - -
BlackFin™5 +++ + + -
ElectroFin®+++ +++ +++ ++
NOTE:
1. Non-corrosive environments may be estimated by the
appearance of existing equipment in the immediate area
where the chiller is to be placed.
2. Marine environments should take into consideration
proximity to the shore as well as prevailing wind
direction.
3. Industrial contaminants may be general or localized,
based on the immediate source of contamination (i.e.
diesel fumes due to proximity to a loading dock).
4. Combined marine-industrial are inuenced by proximity
to shore, prevailing winds, general and local sources of
contamination.
5. Available for models AGZ030-070E only.

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www.DaikinApplied.com 15 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
refrIgeranT sChemaTICs
Figure 26: AGZ030-070E Package Chiller with Microchannel

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Figure 27: AGZ075-100E Package Chiller with Microchannel

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www.DaikinApplied.com 17 IOM 1206-7 • TRAILBLAZER™MODEL AGZ CHILLERS
Figure 28: AGZ110-130E Package Chiller with Microchannel

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Figure 29: AGZ140-180E Package Chiller with Microchannel