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CONVENTIONAL BURNER
When a main burner control knob q is turned to the “lite” position, the gas valve r opens, and
gas flows through the pressure regulator s into the manifold t through the open valve. As gas
passes through the valve and its orifice, it is directed into the venturi u, where it mixes with
primary air to create the proper mixture necessary for combustion.
At the same time, line voltage is applied through the ignitor switch v, to the ignitor spark module
w, which produces high-voltage pulses to all of the spark ignitors x. The pulses cause a spark
y to occur between the spark ignitor electrode, and the ground strap (bracket) z. The gas and
air mixture at the burner head, flows through the three climber ports in the side of the head,
and into the flash tube . As gas flows through the flash tube, it is ignited by the spark. The
combusted gas flashes back through the tube, and ignites the burner.
Refer to Figure 3-32 for the following sequence.
Figure 3-32
PRESSURE
REGULATOR
GAS INLET
IGNITOR
SPARK
MODULE
AIR
SHUTTER
GAS VALVE
IGNITOR SWITCH
VENTURI
BURNER
CONTROL
KNOB
GAS
MANIFOLD
BURNER
FLASH
TUBE
CLIMBER
PORTS (3)
SPARK
IGNITOR
SPARK
GAS FLOW
120 VAC
LINE VOLTAGE
GAS FLOW
HIGH
VOLTAGE
PULSES
OFF
LITE
4
7
9
10
2
5
6
1
3
GROUND STRAP
(BRACKET)
8
11
12
11
12