User Guide

6
Normal Function
With probe temperatures above 100°F, the control applies full voltage to the
motor. The green light is illuminated (full speed LED).
With probe temperatures between 70°F and 100°F, the motor speed is
proportional to the probe temperature. The yellow light is illuminated (variable
speed LED).
When the motor starts at temperatures between 70°F and 100°F, it will hard
start for the length of time dictated by the hard start dial setting. After the
hard start time has elapsed, the motor speed is controlled by the probe
temperature.
As the temperature being sensed decreases, the output voltage decreases.
The output voltage may decrease to the determined cutout speed dictated
by the cutout speed dial. Upon reaching the cutout speed setting, the output
voltage goes to zero volts.
System restart will occur when the temperature exceeds 70°F.
With probe temperatures below 70°F, the motor remains off. The green light
and the yellow light are off.
Heat Pump Bypass Operation
Heat pump bypass mode runs the fan at full speed when the system is
operating in heat mode. This moves as much air as possible across the
condenser coil.
If the heat pump select jumper is in the N.O. position, and 24 VAC is applied
to the HP terminals, the motor will be brought to full speed.
If the heat pump select jumper is in the N.C. position, and 24 VAC is not
present at the HP terminals, the motor will be brought to full speed.
A separate relay is not needed.
Mode of Operation