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2. HEATING
PRINCIPLE OF OPERATION
The differential is the temperature interval which determines when the
heaters turn on and off. The heater offset is the number of degrees below
the set point at which the heaters stop. The heater offset can also take on
negative values. In this case, the heaters stop when the temperature ex-
ceeds the set point by the offset value. When heating is used, the timer
does not function. In the example below, the set point is 75
o
2
F and the differential is 4
temperature rises to 73
Heater Operation
Heating
On
Off
ON
o
F. At 69
o
F, the heaters stop.
Heaters
turn on
Differential
o
4
F
o
69
F
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1
2
3
4
o
F, the heaters turn on. When the
Heater
turn off
Offset
2
o
F
73
o
F
Set Point = 75
TC4-NVS/P
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
5
6
7
o
F, the offset is
Temperature
o
F
TC4-NVS/P.rev.05
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