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Stage 2 Fans
Description of operation
(
Refer to figure 2 on next page)
W
hen the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C)" (point 3), the stage 2 fans start to run at minimum speed and in-
crease in speed proportionally to the room temperature. When the room
temperature rises to "room set point + band width 1 + 0.5°F (0.3°C) + differ-
ential 2" (point 4), the stage 2 fans reach full speed. Above this temperature,
the controller continues to supply full speed voltage. However, a latch switch
should cut off power to the stage 2 fans as the zone A or zone B curtains
open for natural ventilation.
33
TC4-2N6F.rev.07
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