Theory of Operation
RANGES && RRANGETOPS
2-7
The gas and air travel through the
venturi tube and the mixing tube,
also called the throat, where the
gas and air begin to mix together.
The gas and air mixture then enters
into the base of the burner. The
large volume of the base allows the
gas and air to expand, mixing them
together thoroughly.
(See Figure 2-6)
The gas and air mixture then exits
out of the burner ports where it fur-
ther mixes with “secondary air.”
A spark is introduced to this gas
and air mixture as it leaves the
burner ports, which causes ignition.
(See Figure 2-7)
With the proper gas and air mixture,
a flame of natural gas should be
blue with a deep blue inner cone
and have no trace of yellow flame.
(See Figure 2-8)
With liquid propane gas some
orange tipping is acceptable.
In both cases, the flame should be
odorless and completely free of
dangerous gases.
Figure 2-8. Proper Flame
Gas & air exits burner ports,
mixes with secondary air
and is ignited by a spark
Proper flame has dark blue
inner cone surrounded by
lighter blue cone
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