Chapter 8 — Inspection and Maintenance
8-8 Part No. 750-184
purge period. The main fuel valve(s) will be energized, but there should be
no main flame.
The fuel valve(s) deenergize within 4 seconds after the main burner ignition
trial ends. The control will lock out on a safety shutdown. The flame failure
light (and optional alarm) will be activated. The blower motor will run
through the post-purge and stop.
Turn the burner switch off. Reset the safety switch. Re-establish main fuel
supply.
Checking Loss of Flame
With the burner in normal operation, shut off the main burner fuel supply to
extinguish main flame.
The fuel valve(s) will be deenergized and the relay will signal the condition
within 4 seconds. The control will then lock out on a safety shutdown. The
flame failure light (and optional alarm) will be activated. The blower motor
will run through the post-purge and stop.
Turn the burner switch off. Reset the safety switch. Re-establish main fuel
supply.
G. OIL BURNER MAINTENANCE
The burner should be inspected for evidence of damage due to improperly
adjusted combustion. Any soot buildup on the diffuser or the oil nozzle
should be removed. The setting of the oil nozzle in relation to the diffuser
and other components is important for proper firing and should be checked.
Oil Strainers
Oil strainers should be cleaned frequently to maintain a free and full flow of
fuel.
Light Oil Strainers
The fuel oil strainer screen must be removed and cleaned at regular
intervals. It is advisable to remove the screen each month and clean
thoroughly by immersing it in solvent and blowing it dry with compressed
air. To remove, loosen the cover cap screw, being careful not to lose the
copper gasket. If necessary, tap the strainer cover gently to loosen. Check
the cover gasket for damage and replace if necessary. Slip pliers into the
cross on the top of the strainer and twist counter-clockwise to remove the
basket. Reassemble in reverse order.
Heavy Oil Strainers
Keep the cartridge of the oil strainer clear by regularly giving the exterior
handle one complete turn in either direction. Do this often until experience
indicates cleaning frequency necessary to maintain optimum conditions of
flow. If the handle turns hard, rotate the handle back and forward until it can
be turned through a complete revolution. Do not force it with a wrench or
other tool.
Drain the sump as often as experience indicates the necessity. Remove the
sump, or the head and cartridge assembly, for thorough cleaning and
inspection at frequent intervals. Exercise care not to damage the cartridge
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