Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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Grounding of the switch heater metal housing as
well as the ground terminals of the primary arresters
is essential for personnel protection as well as surge
protection. Grounding rods and conductors must be
installed in accordance with the AREMA Signal Manual of
Recommended Practice.
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Primary surge protection must be installed in accordance
with the AREMA Signal Manual of Recommended
Practice.
In
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G.8 Power Connections
1. Remove control cabinet lid and electrical sub
component cover plate.
2. Remove knockout plug. For conduit larger than ½”,
punch an appropriate size hole.
3. Terminate power cables to terminal block and ground
wire to grounding stud.
CAUTION
CAUTION. For three phase systems only - verify
correct fan rotation.
4. Three Phase Systems Only
4.1 Three phase systems only – Place selector
switch in OFF position.
4.2 Turn service power on and close the motor
breaker. Open the combustion chamber access
panel.
4.3 Note the fan rotation arrow.
WARNING
WARNING. Risk of cutting fingers or hand. Keep
hands clear of fan.
4.4 Manually close the motor contactor
momentarily, enough to spin the motor. Verify
the correct rotation. If the rotation needs to
be reversed, open the service breaker and
interchange two of the supply phase wires at
the heaters power terminal block.