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When the range is manufactured the orifi ces are set for use on Natural Gas. If the range is to be used
with LP gas the orifi ce hoods for the bake and broil burner must be adjusted for proper gas fl ow.
Each orifi ce assembly has an LP metering pin located under the orifi ce hood. To adjust the hood for
use on LP gas you simply turn the hood on the threaded base until the hood seals against the LP pin.
The following photographs and drawings illustrate how the gas fl ow is controlled when the Orifi ce
Hood is set for Natural Gas and LP Gas.
Top View of LP Pin and Base
Open Space
around Pin
Hole through
LP Pin
When the orifi ce hood is set for natural gas operation,
gas enters through the hole in the base of the orifce
assembly and passes around the LP pin through the
large spaces between the pin and base. Some gas
also passes through the hole in the LP pin. The gas
fl ows through the hole in the orifi ce hood which meters
the gas fl ow rate for proper operation on Natural Gas.
See the cutaway drawing D1.
When the orifi ce hood is screwed down against the LP
pin it forms a seal preventing gas from bypassing the
LP pin. Gas must fl ow through the smaller opening in
the LP pin which meters the gas fl ow rate for proper
LP operation. The LP pin functions as a stopper with a
hole in it. See the cutaway drawing D2
D1
D2
Orifi ce Base with Hood Removed
LP Pin
Orifi ce Hood
For proper operation, the maximum inlet pressure to the
regulator should be no more than 14 inches of water column
pressure. The inlet pressure to the regulator must be at least
1 inch greater than regulator manifold pressure. Examples: If
regulator is set for natural gas 4 inch manifold pressure, inlet
pressure must be at least 5 inches; if regulator has been
converted for LP/Propane gas 10 inch manifold pressure,
inlet pressure must be at least 11 inches.
Safety Valve LP Gas Conversion
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