Plant mode
An internal datapoint (Plant Mode) from the plant mode strategy module is decoded to provide the required damper output signals. Each damper is commanded to the required position as mentioned in the next table.
Plant mode |
Outside Air Damper |
Exhaust Air Damper |
Mixed Air Damper |
0 = Off |
closed |
closed |
open |
1 = Optimum start |
closed |
closed |
open |
2 = Night cycle |
closed |
closed |
open |
3 = Night purge |
open |
open |
closed |
4 = Occupied period |
auto |
auto |
auto |
5 = Extended operation |
auto |
auto |
auto |
6 = Delayed switch off |
closed |
closed |
open |
11 = Duty cycling |
closed |
closed |
open |
|
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20 = Frost protection |
closed |
closed |
closed |
21 = Fan failure |
closed |
closed |
closed |
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30 = Fire override |
closed |
closed |
closed |