PEC Plus user manual Programming the stages
31040003 55
How normal duty cycles work
For heating elements
When the temperature is above the set point, the heating element is off. When the temperature
drops below the set point, the element switches on for the on duration and then off for the off
duration. If at any time the temperature rises above the set point, the duty cycle switches off and will
not switch on again until the temperature drops below the set point.
For cooling elements
When the temperature is below the set point, the cooling element is off. When the temperature rises
above the set point, the element switches on for the on duration and then off for the off duration. If
at any time the temperature drops below the set point, the duty cycle switches off and will not
switch on again until the temperature rises above the set point.
How advanced duty cycles work
Advanced duty cycles are for cooling only. Advanced duty cycles function similar to normal duty
cycles. Instead of having one set point, advanced duty cycles have two set points.
Set point 1 is the same as the set point in a normal duty cycle.
Set point 2 is a set point that is higher than set point 1.
When the temperature is above the set point 2, the duty cycle remains on, regardless of the on/off
durations. When the temperature drops below set point 2, the duty cycle starts again.
The relay does not switch ON until a temperature condition has been met. For example, if the temperature rises
above 85°F, switch on a mister for 5 minutes and then OFF for 10 minutes. Repeat this until the temperature is
below 85°F.
ON duration ON duration
OFF duration OFF duration
5 minutes 5 minutes
10 minutes 10 minutes
ON
OFF
ll ON durations are the same
All OFF durations are the same
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