Phason
Natural Ventilation Control
33440000
9
Programming the NVC
Before you begin programming the NVC, make sure the control has power and you have
properly
connected
all equipment to the
correct terminals
.
How the curtain settings work
There are six curtain settings.
Set point
– the temperature at which the curtain holds its position.
Idle band
– the buffer around the set point within which the curtain holds its position.
Open on duration
– the duration the curtain opens during the open cycle
Close on duration
– the duration the curtain closes during the close cycle
Open off duration
– the duration the curtain holds its position during the open cycle
Close off duration
– the duration the curtain holds its position during the close cycle
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 (+/- 2°), 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 on duration
. After opening, the curtain holds its position for the
Open off duration
. If the
temperature is still above the
Idle band
, the curtain again opens for the
Open on 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 on duration
. After closing, the curtain holds its position for the
Close off duration
. If the
temperature is still below the
Idle band
, the curtain again closes for the
Close on duration,
and the
process repeats.
