Section B - Components
JBE(X) Manual
Page 13
Oil Nozzle
Several different types of oil nozzles may be used
depending on the type of oil system, burner size,
turndown and application. They all share a common
purpose of atomizing the oil into small droplets so that
they will easily and quickly burn. All of the nozzles are
mounted to the end of the oil gun and inserted into the
support tube. The position of the nozzle can be adjusted
by moving the gun in the tube. The oil nozzles and
gun have a “Top and Bottom” position that is critical for
correct operation. The end of the oil gun is marked with
the word
“TOP”
.
Figures B-14 shows the components of typical air
atomizing nozzles. The nozzle tip and swirler are lapped
together to form a perfect fit and can only be used
together as a matched set. Other air atomizing nozzles
may have slightly different construction.
Figure B-14 Typical Small Air Atomizing Oil Nozzle
Body
Swirler
Nozzle Tip
The pressure atomizing nozzle assembly (Figures B-15)
contains three smaller nozzles that are screwed into a
common body. These nozzles are not intended to be
cleaned internally. However, they can be cleaned on
the surface and the oil screen. The nozzles should be
replaced periodically when the combustion shows
signs of deterioration.
Nozzle Body
Pressure Atomizing
Nozzle
Figure B-15 Pressure Atomizing Oil Nozzles
Oil Gun
The oil gun (B-8) is an integral part of the burner drawer
assembly, but allows the oil nozzle to be adjusted in or
out for best combustion. It is made up of the oil nozzle,
oil supply pipe and either the air pipe (air atomizing) or
return line (pressure atomizing).
The gun assembly must be mounted in the correct
(vertical) position, with the word “TOP” located on top of
the assembly. This will allow for even oil distribution and
prevent oil dripping out of the gun and lines after shutoff.
Nozzle Oil Pressure Gauge
This gauge indicates the oil pressure at the oil nozzle.
This reading is important in determining proper operation
of the nozzle for atomization at any given firing rate.
There is a wide range of possible pressures, but typically
it is in the range of 5 to 40 psi for air atomizing and 65 to
160 psi for pressure atomizing.
Nozzle Atomizing Air Pressure Gauge
(For air atomizing burners only) This indicates the
atomizing air pressure at the nozzle. This reading is
important in determining proper operation of the nozzle
for atomizing the oil. The pressure can vary widely
depending on the nozzle and rate, but typically it will be
in the range of 5 to 40 psi.
Air Compressor
The air compressor, if used, provides air to the oil nozzle
to atomize the oil. The compressor assembly includes the
compressor motor, relief valve and flexible connection to
isolate the vibration of the air compressor.
Air Bleed Valve and Muffler
An air bleed valve is provided with air atomizing systems
to allow some of the air to bleed off and lower the
atomizing air pressure to optimize oil atomization. An air
muffler is provided to reduce the noise from this air flow.
In some cases, the bleed valve modulates with firing rate.
6. Flue Gas Recirculation (FGR)
The flue gas recirculation components in this section only
apply to the JBEX model that uses recirculated flue gas
to reduce the NOx emissions.
Air Filter
Motor
Flexible
Hose Air
Supply
Connection
Figure B-16 Large Air Compressor
Compressor
Motor
Base
Belt Guard
Figure B-17 Small Air Compressor
The flue gas recirculation components in this section only
apply to the JBEX model that uses recirculated flue gas
to reduce the NOx emissions.
