High Temperature Sensor Diagram - Trane ReliaTel Diagnostic Manual

High Temperature sensor Diagram

High Temperature Sensor
The high temperature sensor accessory (BAYFRST001A) provides high limit cutout with manual
reset in ICS device Tracer/ Tracker/ComforTrac/ VariTrac systems. The sensors are wired to the LTB5
and LTB6 in the control panel. Jumper must be removed.
The sensors may be used to detect excessive heat in air conditioning or ventilation ducts and
provide system shut down. Immediately after sensor opens, the associated unit will completely
shut down. The sensors come with case and cover, and mount directly to the ductwork. There are
two sensors that are included in the accessory. Both sensors are factory set; one opens at 135° F
and should be installed in the return air duct, the other opens at 240° F and should be installed in
the supply duct.
Figure 49. High Temperature Sensor Diagram
MANUAL RESET BUTTON
Component Description
BAYFRST001A
Note: This accessory can also be applied in Non-ICS applications. The wiring on the unit is the
To reset a sensor which has opened, push and release the button protruding through the cover. See
reset button. The sensor temperature must drop 25° F below. To reset a sensor which has opened,
push and release the button protruding through the cover. See reset button. The sensor
temperature must drop 25
There are no field adjustments that can be made to the sensor; if a problem exists, the sensor must
be replaced.
Part Number "CNT-0637" = 135° F sensor. Part Number "CNT-0638" = 240° F sensor.
RT-SVD03G-EN
SENSING ELEMENT
Supply Sensor
240˚F
same. The unit will shut down immediately when the sensor opens.
TEST 1
24 VAC
Return Sensor
135˚F
Part Number
CNT-0637 & CNT-0638
TEST 2
Compressor 1 disable
Compressor 2 disable
Immediate shutdown,
Automatic reset
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