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Programming variable and relay stages
How curtains work
Curtains hold their position while the temperature is within the idle band of the set point. For
example, if the set point is 80°F and the idle band is 2°F, the curtain holds its position when the
temperature is between 79°F and 81°F.
If the temperature rises above the idle band (above 81°F in our example), the curtain opens for the
open run duration. After opening, it holds its position for the open idle duration. If the temperature
is still above the idle band, the curtain again opens for the open run duration and the process
repeats.
If the temperature drops below the idle band (below 79°F in our example), the curtain closes for the
close run duration. After closing, it holds its position for the close idle time. If the temperature is
still below the idle band, the curtain again closes for the close run duration and the process repeats.
Time (duration)
Open idle (02:00 mm:ss)
After the curtain opens for the ‘open run’ duration, it holds its position for the
close idle time.
Temperature
Open run (00:30 mm:ss)
If the temperature rises above the idle band, the curtain opens for this duration.
Set point
(80°F)
Idle band (2°F)
When the temperature is within the idle band, the curtain remains in its
current position.
Close run (01:00 mm:ss)
If the temperature drops below the idle band, the curtain closes for this duration.
Close idle (01:00 mm:ss)
After the curtain closes for the ‘close run’ duration, it holds its position for the
close idle time.
2005-04-08
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