Thermon TraceNet TCM 18 - Manual (Page 51)

As a third control mode option, which is a less energy conservative approach, the
TraceNet TC Series panel may be configured for Ambient ON/OFF Control. In this
case, one or two RTD’s may be used to sense ambient temperatures in the process
area. The heat trace will be set to operate at 100% power whenever the ambient
temperature drops below the maintenance temperature which is typically set at 50
◦ F
(10 ◦ C). If the ambient rises above this value, the heat trace will turn off. Obviously,
this type of control mode will also reduce RTD requirements. In this case, there will
naturally be some temperature overshoot expected in the process as the ambient
approaches the turn off point. In this case, mechanical relay switching of the heat
tracing circuits may be used. Ambient Sensing ON/OFF control should not be used
where steam outs and high exposure temperature process conditions are expected
and where the heat trace due to its inherent characteristics cannot be operated dur-
ing such events.
47 PN 50316_0514