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The fans can be set to operate in three different ways:
1 -
To run the fans continuously, set time off to zero and time on to any
value other than zero.
2 -
To stop the fans, set time on to zero and time off to any value equal
to or other than zero.
3 -
To run the fans intermittently, set time on to the desired running
time and time off to the desired off time.
Running the fans continuously or intermittently even though ventilation is
not required for a cooling purpose is useful to reduce the level of humidity
and supply oxygen to the room. It also prevents the fans from freezing in
the winter.
2
Variable speed ventilation
When the room temperature rises to the room set point (point 1), the stage
1 fans stop running according to the minimum ventilation cycle. They begin
to run continuously and increase in speed proportionally to the room tem-
perature. When the room temperature rises to "room set point + band
width 1" (point 2), the stage 1 fans reach full speed. Above this tempera-
ture, the controller continues to supply full speed voltage. However, a
latch switch should cut off power to the stage 1 fans as the zone A or zone
B curtains open for natural ventilation.
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TC4-2N6F.rev.07
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