Chapter 4: Programming
82
Phason
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 4°F, the curtain holds its position when the
temperature is between 78°F and 82°F.
If the temperature rises above the
idle band
(above 82°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 78°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.
on page 137 when setting up curtains.
Temp
er
at
ur
e
Idle band (+/
–
2°F)
When the temperature is within the idle band, the curtain remains in its current
position.
Set point
(80°F)
Open run (00:30 mm:ss)
If the temperaturee rises above the idle band, the curtain opens for this duration.
Open idle (02:00 mm:ss)
After the curtain opens for the “open run” duration, it holds its position for the open idle
duration.
Time (duration)
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
duration.
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