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II.
Low ambient condition kit (if applicable)
A.
The crankcase heater
The crankcase heater is installed at the bottom of the compressor and shall be
turned on all the time. The heater is self-regulated.
B.
The condenser fan control
The condenser fan control is installed at the high side. It closes on rise of
pressure. It is necessary to adjust the setting in the field to avoid fan short cycle.
Head pressure setting: Cut in=170 psig; Cut out=110 psig; Differential=60 psig;
Fig. 12 Condenser Fan Cycle Control
2) A fan speed control may be used to adjust the air flow to achieve the
specified CFM. The fan will run from the minimum speed to full speed with the
control knob at the lowest and highest speed position.
To
adjust the minimum
speed, turn control knob to the lowest speed position, then rotate the setting
(located on the side or front) clockwise to decrease the minimum speed or
counter-clockwise to increase the minimum speed. The minimum speed
should be adjusted until it supplies the required CFM.
Fig. 13 Fan Speed Control
