AIR-COOLED FLUID COOLER
25 • Air-Cooled Condenser Manual
default setpoint for Energy Saver operation is 45°F (7.2°C) with a modulation (throttling) range
up to 50°F (10°C). Field adjustment
5.3.2 Systems with PSC Fan Motor(s)
Systems with PSC fan motor(s) and the optional Energy Saver coil will have the first fan motor
(closest to the electrical enclosure) controlled by a fluid sensing thermostat set to take
advantage of the colder ambient temperatures. The factory default setpoint for Energy Saver
operation is 40°F (4.4°C). Field adjustment of this fluid-sensing thermostat is not unusual.
NOTICE: Every application will have a different ambient temperature
and indoor heat load / air distribution profile. Therefore it is not possible
to dictate the exact fluid temperature setpoint. Field adjustments are
typical to allow fine-tuning to specific conditions.
It is desirable to use the Energy Saver mode as much as possible. However, fluid temperature
that is cold can cause excessive dehumidification and coil sweating. Fluid temperature that is
too high can cause the indoor space temperature to rise. This can cause the indoor evaporator
control to lock out the Energy Saver mode for one (1) hour while it reverts to compressor
cooling. Adjust the setpoints of the thermostats to allow the maximum free cooling time. Over
cooling and under cooling the fluid should be avoided.
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