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On - Off Switch
Power Failure
Manual Reset
Alarm Silencing
Switch (Optional)
Controller Reset
Call for Heat Light
Power On Light
Gas On Light
Alarm Light
Alarm Buzzer
Flame Safeguard
1. General
The JBE and JBEX burner lines are configured from a
common group of components that may vary in size and
style depending on the capacity, NOx level, fuels and
application. These common groups of components are
described in this section, however the exact detail of any
specific burner must be taken from the unit specific
information provided with each burner. This would
include the material list, wiring diagram, catalog cuts
and fuel train drawings.
2. Combustion Air Fan
A forward curved fan is used to supply the combustion
air to burn the fuel. If the burner is equipped with FGR
for low NOx, the fan will also provide the recirculated
flue gas. The fan diameter and width vary to match the
required combustion air flow, FGR rate, burner altitude
and vessel backpressure. The fan operates at 3550 rpm.
An inlet cone is used with the fan to provide a smooth
air flow transition to the fan. Each fan has a matching
inlet cone. The inlet cone should extend into the fan inlet
about 1/4 inch.
Fan and Motor Assembly
The combustion air fan and motor are assembled togeth-
er on a motor support plate that attaches to the windbox.
This assembly is built and balanced as a sub-assembly
JBE(X) Manual
Fuses
Motor Starter
Figure B-6
Control Panel (Gas Shown)
that can be removed for maintenance and repair.
The fan has a hub that is machined to match the motor
shaft diameter and key. Setscrews are used to lock the
fan to the hub. The fan can be adjusted on the shaft to
provide the correct overlap between fan and inlet cone.
Several different motor styles can be used depending on
the application. An Open-Drip-Proof style is most com-
mon and used in a typical enclosed, clean environment.
A TEFC (Totally Enclosed Fan Cooled) would typically be
used in a dirty or wet environment. Other styles are also
available for special applications. The motor dimensions,
including the shaft diameter can vary by motor type.
Windbox
The windbox is an enclosure that routes the combustion
air from the fan to the firing head and provides the
primary mechanical structure for all of the components
of the burner. The combustion air fan and inlet cone are
contained within the windbox. The FGR adapter and air
damper are also connected to the windbox, opposite the
combustion air motor.
The windbox serves as the building block of the burner. It
requires good structural support to the boiler and floor to
handle the weight and movement of rotating components.
The multi-blade damper uses rubber seals on the blade
ends to improve sealing. On a single point positioning
Page 9
Transformer
Control Relays
Terminal Strip
Section B - Components
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