Thermon TraceNet TCM 18 User Manual
Page 86
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