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 veried 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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