Publicité
o
— at 77
F, the curtains are 15% open
o
— at 80
F, the curtains are 41% open
o
— at 81
F, the curtains are 55% open
o
— at 82
F, the curtains are 71% open.
DE-ICING THE CURTAINS
In order to prevent the curtains from freezing in winter weather conditions,
the controller opens the curtains according to a cycle and an opening per-
centage defined by the user. If, during the duration of the de-icing cycle, the
opening of the curtains has remained less than the de-icing opening, the
controller opens the curtains to the value of the de-icing opening. For ex-
ample, let the de-icing cycle be 10 minutes and the de-icing opening 15 %.
If, after 10 minutes, the opening of the curtains has remained below 15%,
the controller opens the curtains to 15% and returns them to their initial
state. In this example, the de-icing counter is reset each time the opening
of the curtains exceeds 15% during normal operation.
Illustration of De-icing
Opening of the Curtains
De-icing
Opening
Minimum
Opening
TC4-NVS/P
The controller opens
the curtains for de-icing
Time
10min
TC4-NVS/P.rev.05
23
Publicité
