Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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4. Rail Thermostat
Mount the rail thermostat on the field or gage side
of the stock rail ahead of the points and tie duct,
as shown. Select a location shaded from the sun.
Provide strain relief in the cable, by leaving adequate
slack, as shown, to allow for rail pumping.
Remove the yellow shim washers when installed on 115
lb rail or lighter. Loosen the two mounting bolts and
attach the rail thermostat to the rail flange by tapping
it on with a hammer. Once in place tighten mounting
bolts to maximize grip.
4.1 Remove the four (4) Phillips screws, the
cover, and the plug from the hole in the rail
temperature surge protection box.
4.2 Pass the two (2) wires from the rail temperature
sensor through the hole, install the locknut and
tighten.
4.3 Insert, one each of the bared wires into the
two terminals on the surge suppression circuit
board, and tighten. There is no polarity.
4.4 Replace the cover, and tighten the four (4)
Phillips screws.
4.5 Connect the surge isolator two pin connector
with the mating plug located inside the electrical
component area, hanging immediately under
the DSI.