Thermon TraceNet TCM 18 - Manual (Page 91)

The TCM18 control module utilizing pipe sensing RTD’s could be typically set as
indicated below:
Control Parameter Setting
Controller Configuration Dual RTD Inputs
Control Method Proportional
Maintain Temperature 80 ◦ F (27 ◦ C)
Control Band 5 ◦ F (3 ◦ C)
High Alarm Temperature 90 ◦ F (32 ◦ C)
High Temperature Trip On
Low Alarm Temperature 60 ◦ F (15 ◦ C)
Power at Maintain Temp 100%
Considering that we have fifteen heat tracing circuits, the TCM18 would be set up
with 30 RTD sensors.
The heat tracing circuit control assignments would be as follows:
Circuit No. Setting
1 thru 15 Enabled (2 Pipe)
16 thru 18 Spare
In this case power relays on circuits 16, 17, and 18 will not be connected to the heat
tracing and because the circuits are listed as “Spare” they will not appear during the
Scan Mode process.
Example D6 - Process Temperature and Ambient Sensing Control - Single and Dual
RTD Sensing
In many applications there are a variety of control applications. Some may be the
critical applications such as the 50% caustic in Example 5 and some may be simple
water freeze protection. For this combination application, the typical design require-
ments are as listed below:
87 PN 50316_0514