CleaverBrooks 4WI, Руководство по эксплуатации, обслуживанию и запасным частям

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Inspection and Maintenance
8-12 750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8.7.3 — Cleaning the Oil Nozzle
The design of the burner, together with the oil purge system on a heavy oil burner, keep it operationally clean when
firing on oil. 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.
FIGURE 8-14.
Standard and High Turndown Burner Nozzle Components
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 preci-
sion 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 reas-
sembling, 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.
8.7.4 — 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 so.
Clean the strainer screen carefully to remove any foreign matter. Use suitable solvents in cleaning. 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.