CleaverBrooks CBLE, Operation And Maintenance Manual

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750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual 8-9
8.8 — Gas Burner Maintenance
4.
Perform any necessary cleaning with a suitable solvent. Take the necessary precautions when working with sol-
vents. 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.
5.
Inspect for scratches or signs of wear or erosion, which may make the nozzle unfit for further use.
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.
6.
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.
7.
See that the plugged hole is at the bottom of the nozzle body when the gun is installed.
8.7.5 — 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.
1.
Clean all internal surfaces of the tip and the slotted parts of the core using a wood splinter to avoid damage
from scratching.
2.
Replace the core, setting it tightly but not excessively so.
3.
Clean the strainer screen carefully to remove any foreign matter. Use suitable solvents for cleaning. Extremely
hot water at high velocity is also helpful in cleaning.
4.
Replace strainer by screwing it into the nozzle body only finger tight. Do not use an orifice of a size other than
originally installed.
8.7.6 — Ignition System
For best results, maintain the proper gap and dimensions of the ignition electrode(s).
1.
Inspect the electrode tip for signs of pitting or combustion deposits and dress as required with a fine file.
2.
Inspect the porcelain insulator(s) for any cracks that might be present. If cracks are present, replace the elec-
trode since cracks in the insulator can cause grounding of the ignition voltage.
3.
Wipe the insulating portion of the electrode(s) clean of any carbon, if present. Carbon is an electrical conductor.
Ammonia will aid in removing carbon and soot.
4.
Check the ignition cables for cracks in the insulation.
5.
Check to see that all connections between the transformer and the electrodes are tight.
6.
Periodically remove the access plug from the gas pilot aspirator and clean out any accumulated lint or other for-
eign material.
8.8 — Gas Burner Maintenance
The gas burner components should be inspected for evidence of damage due to improperly adjusted combustion.
Combustion adjustments should be checked monthly.