750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8-11
8.7 — Oil Burner Maintenance
The flame detector lens should be cleaned as often as oper-
ating conditions demand. Use a soft cloth moistened with
detergent if necessary.
FIGURE 8-12. Main Gas Train
8.7 — 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 positioning of the oil nozzle in relation to the diffuser and
other components is important for proper firing and should be checked. See Section 6.20 in Chapter 6.
8.7.1 — 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.
8.7.2 — 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 forth until it can be turned through a com-
plete 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 discs or the cleaner blades.
Wash the cartridge in solvent. Do not attempt to disassemble the cartridge.
FIGURE 8-13. Heavy Oil Cleaner
NOTE: All oil strainer, light and heavy, should be cleaned frequently to maintain a free and full flow of fuel.
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