
The TCM18 control module using foundation temperature sensing RTD’s in each
heating zone can be typically set at the control settings given below:
Control Parameter Setting
Controller Configuration Single RTD Input
Control Method Proportional
100% Power On Temperature 50
◦
F (10
◦
C)
Control Band 30
◦
F (17
◦
C)
High Alarm Temperature 90
◦
F (32
◦
C)
High Temp Trip On
Low Alarm Temperature 38
◦
F (3
◦
C)
In a proportional control mode, the heater should be continually operating using cy-
cle omission techniques in a warming mode (and will thus minimize condensation
within the heating system conduits). After attaining 50
◦
F (10
◦
C), the TCM18 will lin-
early reduce power until an equilibrium value between 50
◦
F(10
◦
C), and 80
◦
F(27
◦
C),
is obtained. In the unlikely event that the 80
◦
F (27
◦
C), setting is exceeded, the con-
trol will de-energize the heater circuit. A high temperature alarm will activate should
the RTD sensor detect a temperature above the 90
◦
F (32
◦
C) value and the circuit
will trip.
Having set in these values as well as the appropriate other limit/control values, the
following typical control can be achieved.
PN 50316_0514 82
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