Programming equipment settings
57
Programming duty cycles
A duty cycle switches equipment on and then off for specific durations, consistently repeating the
process.
There are three types of duty cycles:
temperature based
,
time based
, and
persistent
.
Temperature based
A temperature based duty cycle has an on duration, an off duration, and a temperature set point. A
temperature based duty cycle operates when the temperature is above the set point for cooling, and
below the set point for heating.
For cooling, the equipment switches on for the on duration and then off for the off duration only
when the temperature is above the set point. For a heating duty cycle, equipment switches on and
off only when the temperature is below the set point.
Time based
A time based duty cycle has an on duration, an off duration, a start time, and a stop time. A time
based duty cycle operates equipment only during defined times of the day. For example, you can
have a duty cycle that is on for 5 minutes and then off for 10 minutes between 8 AM and 5 PM.
Persistent
A persistent duty cycle has an on duration and an off duration A persistent duty cycle operates
equipment at all times and temperatures.
Before programming duty cycles, make sure you have properly configured the
relays. For more information, read
Heating, cooling, and duty cycle relay worksheet
on page 85 when
setting up heating and cooling equipment.
ON duration
ON duration
OFF duration
OFF duration
ON
OFF
All
on durations
are the same
All
off durations
are the same
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