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a good seal. The basket can be lifted out and cleaned with
a soft brush and cleaning solution.
d. Vacuum higher than the 10" limit on suction side of pump
(indicates need to clean strainer, as described above). If
cleaning the strainer does not resolve this, check the other
valves between the tank and gauge for plugged or closed
position.
e. Air atomized oil nozzles should be cleaned periodically,
depending on the type of operation and the observed need
for cleaning. Extended operation at very low rates (less
then 15% of capacity) can cause carbon buildup on the
outside of the nozzle. This can be cleaned with a rag and
cleaning solution. If the fire is showing some deteriora-
tion, and the external surfaces are clean, then the nozzle
should be removed, disassembled and cleaned using a
soft brush and cleaning solution.
f. If the edges of the air atomizing nozzle are not sharp,
or the nozzle shows sign of wear and the combustion is
deteriorated, the nozzle should be replaced. The nozzle
part number is given on the material list of the unit. In
general, a single port (center hole) uses a 80 o nozzle or
multiport (multiple hole at the spray angle) nozzle with a
spray angle of 70 degrees will work well for light oil. Heavy
oil should use a spray angle of about 60 degrees.
g. Pressure atomized oil nozzles have a filter feeding the
nozzle that can be plugged over time. The filter can be
unscrewed from the back and cleaned, using a soft brush
and cleaning solution. When the nozzle(s) are removed
form the nozzle body (BPS nozzles), the plastic seals at
the end of the nozzle must be replaced, or the nozzle may
not seal correctly. The seal can be slid off of the nozzle
and a new one installed. Use extreme care to not put any
cuts or nicks in the seal. Once the seal is on, the nozzle
can be inserted and screwed into the nozzle body.
h. If a pressure atomized oil nozzle needs to be replaced,
it should be a Delevan Veriflow type, using a 60 degree
spray angle (JB3 BPS nozzle(s)).
i. Check safety limits, including pressure and temperature
switches
6. FGR Systems
The flue gas is corrosive and requires regular inspection of
the equipment to ensure proper and safe operation. The
potential for corrosion and frequency of the inspection can
vary greatly based on the application. Applications with
condensation will have more corrosion and will need more
maintenance. Frequent cycling, cold startups, cool op-
erating temperatures, cool air temperatures and outdoor
installations are good examples of where high levels of
condensation can occur.
Areas to inspect for corrosion:
• FGR control valves(s)
• FGR Duct
• Air inlet louver box
• Fan and fan housing
• Burner housing
• Firing head and blast tube
JB Manual
Other checks:
a. The condensation traps must work properly and be
installed to capture all of the condensation. If condensa-
tion passes through to the burner windbox, a condensate
drain should be added to the bottom of the windbox.
b. Linkage and valve movement must operate freely and
smoothly.
c. If the FGR valve is modulated partly open (oil firing on
dual fuel burner) check position of FGR valve.
d. NOx emission levels.
e. Other general items like the refractory.
f. Stack temperature of boiler - high temperatures will
increase NOx levels.
g. Operation of safety equipment.
h. Time delay on FGR on-off valve (if equipped).
7. Combustion Air Fan
If the fan and motor are ever removed, the following
should be observed in re-assembly.
a. There should be about 1/16" overlap of inlet cone and
fan.
b. Never re-use the fan to motor shaft set screws, always
use new screws of the same type and style to maintain
balance and fan retention.
c. When tightening the fan hub set screws, rotate the fan
to place the screws on the bottom. This way the screw
is not lifting the fan.
d. The motor shaft and fan hub must be clean and free
of burrs.
As a minimum, the following replacement parts should
Page 46
General Maintenance & Care
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