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3. To run the fans intermittently, set time on to the desired running
time and time off to the desired off time.
PRINCIPLE OF OPERATION
The differential is the temperature interval which determines when the fans
turn on and off in continuous mode. The Stage 2 offset is the number of
degrees above the set point at which Stage 2 fans stop operating continu-
ously. The fans run continuously when the termperature reaches the set
point plus the offset plus the differential for Stage 2. In the example below,
the set point is 75
the fans stop operating according to the minimum ventilation cycle and run
continuously. If the temperature falls to 83
tinuously and operate according to the minimum ventilation cycle.
Operation of the Fans
Cooling
Continuous
Operation
Minimum
Ventilation
Cycle
Set Point = 75
o
F, the offset is 8
Continous
operation
ends
Offset
o
8
F
o
F
o
F and the differential is 4
o
F, the fans stop running con-
Differential
4
o
F
o
83
F
TC4-NVS/P
o
F. At 87
Continuous
operation
begins
Temperature
o
87
F
TC4-NVS/P.rev.05
o
F,
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