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Stage 3 and 5 Fans
Description of Operation
(
Refer to figure 3 below)
1.0°F
(0.6°C)
W
hen the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C) + differential 2 + differential 3" (point 5), the stage 3 fans start to
run. The controller continues to supply voltage as long as the room tempera-
ture remains above "room set point + band width 1 + 0.5°F (0.3°C) + differ-
ential 2" (point 6). However, a latch switch should cut off power to the stage
3 fans as the zone A or zone B curtains open for natural ventilation. When
the room temperature falls to "room set point + band width 1 + 0.5°F (0.3°C)
+ differential 2" (point 6), the stage 3 fans return to a stop.
When the room temperature rises to "room set point + band width 1 + 0.5°F
(0.3°C) + differential 2 + differential 3 + curtain dead band + differential
5" (point 7), the stage 5 fans start to run. When the room temperature falls
35
TC4-2N6F.rev.07
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