Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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I.5 Burner Removal
1. Turn heater OFF and disconnect power.
2. Once impeller is at a complete stand still, remove
combustion chamber access panel.
3. Remove nut and bolts holding defroster (2). Remove
cable straps holding wire to pipe. Let defroster hang.
4. Open pipe union (5).
5. Remove bolts fastening both mounting brackets (10)
to the combustion chamber. Leave brackets attached
to the burner.
6. Remove burner.
7. Reverse procedure to reinstall.
I.6 Burner Defroster Removal
NOTE:
The defroster circuit is protected with a reset-enabled
fuse. If tripped, open then close the panel breaker to
reset.
1. Turn heater OFF and disconnect power.
2. Once impeller is at a complete stand still, remove
combustion chamber access panel.
3. Remove nut and bolts holding defroster (2). Remove
cable straps holding wire to pipe. Let defroster hang.
4. Open electrical access panel. Trace defroster wires
to terminal block (16), terminals 5 and 6, circled.
Disconnect last two wires on the bottom furthest
right of terminal block.
5. Reverse procedure to reinstall.
J. SERVICE
J.1 Recommended Service Schedule
Item Annually
Every 5
Years
Inspect flame rod X
Inspect flame rod wire and boot X
Inspect igniter X
Inspect igniter wire and boot X
Inspect ductwork X
Measure motor vibration X
Inspect and tighten all electrical
terminations
X
Inspect and replace any damaged access
panel gaskets
X
Inspect and replace any damaged duct
gaskets
X
Inspect gas supply pressure X
Perform gas supply leak test X
Perform manifold leak test X
Inspect burner X
Service burner X
1. Inspect heater annually.
2. Ensure the air intake and all ductwork are not
obstructed.
3. Keep area around heater clear and free from
combustible material, gasoline and other flammable
vapours and liquids.
4. Replace all damaged ducts, including intake,
crossducts, point and track duct nozzles.
5. Damaged ducts will degrade switch clearing ability.
6. With the supply power turned off, tighten all mounting
and electrical connections to the recommended
tightening torque.
Thread Size Tightening
Torque (in./lbs)
8 - 32 19
10 - 32 31
1/4 - 20, Power Terminal Lugs and AAR Terminals 75