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




20 = Frost protection

closed

closed

closed

21 = Fan failure

closed

closed

closed




30 = Fire override

closed

closed

closed