Chapter 8 — Inspection and Maintenance
Part No. 750-184 8-9
discs or the cleaner blades. Wash the cartridge in solvents. Do not attempt
to disassemble the cartridge.
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 and any necessary 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 normal
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.
Cleaning Air Purge Nozzle (No. 6 Oil) and Back Pressure
Orifice Nozzle (No. 2 Oil)
The air purge nozzle and its strainer should be inspected periodically and
cleaned. The nozzle consists of a tip and internal core. Clean all internal
surfaces of the tip and the slotted parts of the core using a wood splinter to
avoid damage from scratching. Replace the core, setting it tightly but not
excessively.
Clean the strainer screen carefully to remove any foreign matter. Use suitable
solvents in cleaning. Extremely hot water at high velocity is also helpful in
cleaning. Replace strainer by screwing it into the nozzle body only finger
tight. Do not use an orifice of a size other than originally installed.
Ignition System
For best results, maintain the proper gap and dimensions of 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
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