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Junction Box
The junction box contains the electrical connections that
are required between the burner and control panel.
Manual Potentiometer Rate Control
The manual potentiometer is used to position the firing
rate when the burner "Auto-Manual" switch is in "Manual"
mode. It is used to setup and check the burner. When
in the "Automatic" position, this potentiometer acts as a
firing rate limiting potentiometer. Placing it at the low fire
position will prevent the burner from modulating above
low fire. For normal automatic operation, it must be
positioned at the full rate (clockwise) position.
Control Transformer (Optional)The control circuit
transformer is used to reduce the main power input to
115 VAC for the control circuit. If this electrical supply
could be provided as a separate input, this transformer
would not be required. The transformer has two fuses
located on the transformer box.
Alarm Bell
The alarm bell (or buzzer) provides an audible noise if
the burner were to lock out due to an alarm condition.
Control Relays
Relays are provided to support electrical options. The
number and type will vary with the equipment. Relays
will be indicated on both the wiring diagram and material
list.
Motor Starters
At least one motor starter, for the combustion air fan, will
be included in each control panel. If other motors are
used, for an oil pump or air compressor, these will also
be located in the control panel.
Page 16
JBE(X) Manual
Section B - Components
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