PEC Plus user manual Programming the stages
31040003 47
How variable stage cooling works
When the temperature is below the “off at” temperature, the fan is off.
When the temperature reaches the “off at” temperature, the fan runs at the idle speed. The fan
continues to run at the idle speed until the temperature rises to the “set point” temperature.
When the temperature is between the “set point” and “on full at” temperatures, fan speed
increases or decreases proportionally with the temperature.
When the temperature is at or above the “on full at” temperature, the fan runs at full speed.
If you need to connect more cooling elements than you have relays available, and
you are not using both variable stages, you can use an available variable stage as
an ON/OFF stage (for 120/230 VAC-powered equipment only).
Set the idle speed to 100% and ‘off at’ to the temperature at which you want the
stage to switch on/off. You no longer have “variable” speed or power; instead you
have either full on or full off, the same as a regular cooling element. The ‘set point’
and ‘on full at’ settings have no effect when you use a variable stage this way.
0% 100%
Temperature
Fan speed
Fan speed increases as the temperature rises,
or decreases as the temperature falls.
The fan runs at idle speed. The temperature
band between the ‘off at’ temperature and the
‘set point’ is sometimes called the ‘idle band’.
The fan is off when the temperature is below
the ‘off at’ temperature.
The fan runs at full speed.
Range/On full at
temperature
Off at
temperature
Idle speed
Set point
temperature
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