750-96 (revised 2010)
Model CB Packaged Boiler Manual
7-7
7.7 — Oil Burner Maintenance
7.7 — Oil Burner Maintenance
The burner should be inspected for evidence of damage due to improperly adjusted combustion. The setting of the
oil nozzle in relation to the diffuser and other components is important for proper firing and should be checked.
See Section 5.13 in Chapter 5.
The seal between the burner housing and the oven liner is extremely important. Its condition should be checked
periodically and repairs made as necessary.
7.7.1 — Oil Strainers
Oil strainers should be cleaned frequently to maintain a free and full flow of fuel.
7.7.1.1 — Light Oil Strainers
The fuel oil strainer screen must be removed and cleaned at regular intervals. It is advisable to remove this screen
each month and clean thoroughly be immersing in solvent and blowing dry with compressed air. To remove, loosen
the cover cap screw being careful not to lose the copper gasket. Tap the strainer cover gently to loosen. Check
the cover gasket. Slip pliers into the cross on the top of the strainer and twist counterclockwise to remove the bas-
ket. Reassemble in reverse order.
7.7.1.2 — Heavy Oil Strainers
Keep the cartridge of the Cuno 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 it is difficult to turn the handle, rotate back and forth until the handle can be turned through a complete rev-
olution. Do not force with a wrench or other tool.
Drain the sump as often as experience indicates the necessity. Remove the sump, or head and cartridge assembly
for thorough cleaning and inspection at frequent intervals. Exercise care not to damage cartridge discs or cleaner
blades. Wash the cartridge in solvents. Do not attempt to disassemble the cartridge.
7.7.2 — Fuel Oil Treatment
Conditions and the quality of the fuel oil being supplied to the burner may vary to the extent and degree that the
use of fuel oil additives may be advisable to obtain proper combustion and to aid in pumping of the oil. The fuel oil
storage tank(s) should be checked periodically and cleaned of any sludge deposits.
7.7.3 — Cleaning Oil Nozzle
The design of the burner, together with the oil purge system on a heavy oil burner, make it unnecessary to clean
the oil nozzle during periods of operation. A routine check should be made during off periods or when the burner
is firing on gas and any necessary cleaning performed.
If at any time the burner flame appears “stringy” or “lazy,” it is possible that the nozzle tip or swirler has become
partially clogged or worn. Any blockage within the tip will cause the air pressure gauge to increase above its nor-
mal value.
To disassemble, unlatch and withdraw the burner gun. Insert the nozzle body into the hanger vice and use the
spanner wrench to remove the tip. Carefully remove the swirler and seating spring being careful not to drop or
damage any parts.
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