Inspection and Maintenance
5-8
750-392
CBEX-DE
5.8.1 — 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.
5.8.2 — Cleaning the Oil Nozzle
The design of the burner should be kept operationally clean when firing on oil. A routine check and any neces-
sary cleaning should be made during off periods or when the burner is firing on gas.
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.
Disassemble with the power off by unlatching and withdrawing the burner gun. Insert the nozzle body into the
hanger vice and use the spanner wrench to remove the tip. Remove the swirler and seating spring being careful
not to drop or damage any parts.
Perform any necessary cleaning with a suitable solvent. Use a soft fiber brush or pointed piece of soft wood for
cleaning. Do not use wire or a sharp metallic object, which could scratch or deform the orifices as well as the
precision ground surfaces of the swirler and tip. Inspect for scratches or signs of wear or erosion, which may
make the nozzle unfit for further use. Take the necessary precautions in working with solvents.
The tip and swirler are a matched set, which are precision lapped at the time of assembly. The close fit of the
lapped surfaces must be maintained in order to provide optimum performance. Additional lapping may be
required to provide better atomization for more efficient combustion. Do not interchange parts if a spare is kept.
In reassembling, be certain that the seating spring is in place and that it is holding the swirler tightly against the
tip. The swirler is stationary and does not rotate, but rather imparts a swirling motion to the oil.
See that the plugged hole is at the bottom of the nozzle body when the gun is installed.
5.8.3 — Ignition System
For best results, maintain the proper gap and dimensions for the ignition electrode(s).
Inspect the electrode tip for signs of pitting or combustion deposits and dress as required with a fine file. Inspect
the porcelain insulator (s) for any cracks that might be present. If there are cracks, replace the electrode since
they can cause grounding of the ignition voltage. Since carbon is an electrical conductor, it is necessary to keep
the insulating portion of electrode(s) wiped clean if any carbon is present. Ammonia will aid in removing carbon
or soot.
Check ignition cables for cracks in the insulation. Also see that all connections between the transformer and the
electrodes are tight. Periodically remove the access plug from the gas pilot aspirator and clean out any accumu-
lated lint or other foreign material.
NOTE: Oil strainers should be cleaned frequently to maintain a free and full flow of fuel.
To Next Page
Loading...
Need help?
General
