Burnham LE L7248 User Manual
Page 19
1
H. COLD OIL — If the oil temperature approaching
the fuel pump is 40°F or lower poor combustion or
delayed ignition may result. Cold oil is harder to
atomize at the nozzle. Thus, the spray droplets get
larger and the flame shape gets longer. An outside
fuel tank that is above grade or has fuel lines in a
shallow bury is a good candidate for cold oil. The
best solution is to bury the tank and lines deep
enough to keep the oil above 40°F.
I. HIGH ALTITUDE INSTALLATIONS
Air settings must be increased at higher altitudes.
Use instruments and set for 11.5 to 12.5% CO
2
.
J. START-UP NOISE — Late ignition is the cause of
start-up noises. If it occurs recheck for electrode
settings, flame shape, air or water in the fuel lines.
K. SHUT DOWN NOISE — If the flame runs out of air
before it runs out of fuel, an after burn with noise
may occur. That may be the result of a faulty cut-
off valve in the fuel pump, or it may be air trapped
in the nozzle line. It may take several firing cycles
for that air to be fully vented through the nozzle.
Water in the fuel or poor flame shape can also cause
shut down noises.
15
. ATTENTION TO BOILER WHILE NOT IN
OPERATION.
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A. Spray inside surfaces with light lubricating or
crankcase oil using gun with extended stem so as to
reach all corners.
B. Always keep the manual fuel supply valve shut off
if the burner is shut down for an extended period of
time.
C. To recondition the heating system in the fall season
after a prolonged shut down, follow the instructions
outlined in Section III — Operating and Service
Instructions, Items 1 through 8.
(4) Tank connection leaks.
There are various test kits available to trace air
leaks, such as electronic sight glasses. Follow the
manufacturers' instructions to find air leaks.
The following actions can eliminate air leaks:
(1) Bleed pump as detailed previously.
(2) Replace flare fittings.
(3) Replace oil supply line.
(4) Repair oil filter leaks.
(5) Replace or repair tank fittings.
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E. GASKET LEAKS — If 11.5 to 12.5% CO
2
with a
#1 smoke or less cannot be obtained in the
breeching, look for air leaks around the flue collar.
Such air leaks will cause a lower CO
2
reading in the
breeching. The smaller the firing rate the greater
effect an air leak can have on CO
2
readings.
F. DIRT — A fuel filter is a good investment. Acci-
dental accumulation of dirt in the fuel system can
clog the nozzle or nozzle strainer and produce a
poor spray pattern from the nozzle. The smaller the
firing rate, the smaller the slots become in the
nozzle and the more prone to plugging it becomes
with the same amount of dirt.
G. WATER — Water in the fuel in large amounts will
stall the fuel pump. Water in the fuel in smaller
amounts will cause excessive wear on the pump,
but more importantly water doesn’t burn. It chills
the flame and causes smoke and unburned fuel to
pass out of the combustion chamber and clog the
flueways of the boiler.