Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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2. Ambient Temperature Sensor
To route the sensor cable it is necessary to remove the
air intake.
2.1 Remove the 4 screws holding the extension
to the elbow. Leave the hood and extension
fastened together. Remove intake.
2.2 Mount the ambient temperature sensor inside
the air intake hood with a pair of 8-32 screws,
nuts and washers, in the location shown.
2.3 Route the cable through the screen, and down
the inside of the extension.
2.4 Pass the cable through the hole at the base of
the extension.
2.5 Cut the diaphragm grommet, as shown, and
push the connector and cable through. Insert
grommet and cable into hole. Reinstall intake.
2.6 Pass cable through hole into control panel and
repeat procedure for grommet install.
2.7 Remove wire through cover and route cable to
a point directly beneath the EMS module. Insert
connector into mating receptacle.
2.8 Draw the excess cable into the control cabinet.
Place the excess neatly into the wire trough and
replace the lid.
3. Precipitation Indicator
Remove the plug from the top hole marked
‘Precipitation Sensor’. Pass the 4-pin connector
through the hole, install lock nut and tighten.
3.1 Insert jack into mating connector.
3.2 Mount the detector on the transition duct to
sensor duct flange facing forward as shown, use
the mounting holes and slots provided. Heat
from the duct will keep it clear of ice and snow
build up.