750-204
Profire D/LND
5-9
5.12 — Gas System
5.11.8 — Nozzle Line Heater
Nozzle line heaters damaged by water accumulation do not qualify for warranty or exchange service. Failure to
prevent water accumulation inside the heater manifold constitutes improper care.
Completely drain the heater manifold periodically. This should be part of the preventive maintenance program.
maintenance consists primarily of removing the heating element from the manifold and scraping any accumula-
tion of carbonized oil or sludge deposits from the heat exchange surfaces.
Before braking electrical connections to the heating elements, mark all wires and terminals to assure correct
replacement of wires.
Periodic cleaning is necessary to prevent overheating or burnout of the elements. If operation of the heater
becomes sluggish, examine the elements and clean as required.
Inspect the manifold each time the heater is removed. Flush all accumulated sludge and sediment before it is
turned on.
5.11.9 — Oil Strainers
Oil strainers should be cleaned frequently to maintain a free and full flow of fuel. The strainer screen must be
removed and cleaned at regular intervals. The screen should be removed and cleaned thoroughly by immersing it
in solvent and blowing it dry with compressed air. Light oil strainers should be cleaned each month. Heavy oil
strainers should be checked and cleaned as often as the experience indicates the necessity.
5.12 — Gas System
5.12.1 — Motorized Main Gas Valves
Should the valve fail to operate, check for voltage at the valve. Make certain that the main shutoff cock is closed
prior to testing. The actuator is not field repairable nor should it be disassembled. Replace the actuator if the
valve fails to operate. After replacement, cycle the valve with the fuel shutoff to determine that it opens and
closes. If the valve has a visual indicator, observe its position for correct operation.
5.12.2 — Solenoid Valves
A slight hum from the solenoid is normal when the coil is energized. Should the valve fail to operate, check that
there is voltage at the valve coil. If there is no voltage at the coil, check for loose wiring connections. If there is
proper voltage at the valve coil and the valve still fails to open, replace the coil. Refer to the manufacturer’s bul-
letin for correct procedure in coil replacement.
Should it become necessary to replace the complete valve, be sure that the flow is in the direction of the arrow
on the body.
All power must be disconnected before servicing the valves.
!
Caution
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