Thermon TraceNet TCM 18 - Manual (Page 83)

Circuit Number 2 7 9 12 16
RTD Sensor Mode 1 AMB 1 AMB 2 AMB 1 AMB 2 AMB
RTD#1 Input −10 OPEN −14 OPEN −8
RTD#2 Input XX XX −12 XX OPEN
RTD#1 Reading Used a-10 −10 −14 −10 −8
RTD#2 Reading Used XX XX a-12 XX −12
Note: XX is an ignored RTD Input due to 1 AMB Mode
Note that Circuit 2 RTD#1 is reading an ambient -10, so the TCM18 uses this RTD
as the main RTD control sensor (SysAmbient1). Since this input is SysAmbient1 an
‘a’ is prepended to the reading displayed. The Circuit 2 RTD#2 is not installed so
this sensor location is ignored. Note also that on Circuit 9 both RTD#1 and RTD#2
are programmed as ambient sensed and are reading -14 and -12 respectively, so
the backup second RTD (SysAmbient2) will be RTD#2 from Circuit 9. Since this
input is SysAmbient2 an ‘a’ is prepended to the reading displayed.
Because Circuit 2 has an RTD reading within the stipulated valid range, it will con-
trol off its own RTD#1 sensor. Also Circuit 7 will control off the main RTD sensor
(SysAmbient1) since its own RTD#1 input is reading as OPEN (no sensor present).
Circuit 9 will control off its own RTD#1 and RTD#2 inputs because both are valid RTD
ambient readings. Circuit 12 will control off the main ambient RTD sensor (SysAmbi-
ent1) since its own RTD#1 sensor has an OPEN reading (no sensor present). Circuit
16 will control off its own RTD#1 sensor and the backup RTD sensor (SysAmbient2)
since its own RTD#2 sensor has an OPEN reading (sensor not present).
In this arrangement, all other circuits were programmed as pipe sensing RTD sen-
sors and thus each of those circuits ignore the ambient sensing RTD readings and
use the sensors present for those circuits.
79 PN 50316_0514