Thermon TraceNet TCM 18 - Manual (Page 43)

1. ENABLED (selected for the normal control
mode)
2. FORCED ON (typically selected to turn the
heater on for diagnostic purposes). This set-
ting will automatically revert back to the “EN-
ABLED” status if a high or low temperature
alarm event occurs and the ALARM ACK is
pressed.
As exceptions, when an auxiliary
Forced Off switch is included and activated in
the panel with the TCM18, all circuits will re-
main OFF during a Low Temperature alarm
event. When an auxiliary Forced On switch
is provided and activated with the TCM18, all
circuits will alarm when the high temperature
alarm set point is reached and will begin con-
trolling at this value until the condition is cor-
rected or the Forced On switch is turned off.
3. SPARE (selected where spare circuits are in-
cluded in set-up and operator does not want to
see spare circuit information during the SCAN
sequencing process).
4. DISABLED (selected to take a circuit out of op-
eration).
Note when Ambient Proportional Control is selected
the labels “AMB” become “APC”
Also included in this programming sequence is the
setting of the heater and RTD coordination.
The
selectable options are:
1. 1 PIPE (single pipe sensing RTD controlling
one heater circuit)
2. 2 PIPE (dual pipe sensing RTD’s controlling a
single heater circuit with control off the lowest
reading and alarm/trip off the highest reading)
3. 1 AMB (ambient sensing based on RTD1 on
one or more of the heat tracing circuits). Refer
to Part 8 for additional detail.
39 PN 50316_0514