TM 5-3895-374-24-2
TEMPERATURE CONTROLLER
This unit is located on the stack side of the panel box. It controls the temperature of the heat
transfer fluid being circulated through the heater. The controller will not call for heat unless the
heat transfer oil temperature drops 20F below the set point. The burner will modulate to its high
fire position when the set point selected is more than 15°F above the heat transfer oil
temperature. The modulation range (low fire high fire) is set at the factory to be 25F to minimize
cycling. SECTION 6: HEATER COMPONENTS has a more complete discussion of the
temperature controller.
During normal operation the temperature controller remains in its "OPERATOR" mode. To
change the hot oil temperature set point the up and down arrow keys are used. If either one of
these keys is held down for more than two (2) seconds, the set point will be changed. The longer
one of the keys is held down the faster the set point is changed. The up arrow key increases the
set point and the down arrow decreases the set point.
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