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NATURAL AND L.P. GAS CONVERSION
GENERAL
Ranges must be adjusted when going from one type of fuel to another due to the characteristics
of the gases. This means that, for efficient combustion, air must be mixed with the gas. The amount
of air to be mixed with the amount of gas is called the
air-to-gas ratio
. The combustion ratio is
different between natural and L.P. gas. L.P. gas requires much more air (24:1) to be mixed with
it than natural gas (10:1).
Also, there are differences in
caloric values
between the gasses. When a cubic foot of L.P. gas
is burned, it produces much more heat than the same volume of natural gas. This is why the burner
orifices must be changed to restrict the gas flow when converting to L.P. use. In other words, the
range uses less fuel and more air with L.P. gas to create the same amount of heat with natural gas.
L.P. gas is also distributed and used at higher pressure (11
"
WCP) than natural gas (4
"
WCP). This
is why the pressure regulator must be converted when changing from natural gas to L.P. operation
(refer to the following chart).
CHARACTERISTICS
NATURAL PROPANE BUTANE
Colorless, Odorless, Non-Toxic, Gaseous
(Oxidizer Added)
B.T.U./Cu. Ft. 900 to 1100 2500 3010
Combustion Ratio Cu.
Ft. Air/Cu. Ft. Gas
10 24 31
Operating Pressures:
Manual
Service
Range
8.25 PSI
5" - 14" WCP
4" WCP
Not Applicable
11" - 15" WCP
10" WCP
Not Applicable
11" - 15" WCP
10" WCP
GAS CHARACTERISTICS
Change Regulator Orifices & Air Shutters Due To Differences In Gasses
RANGE TYPE REGULATOR
COOKTOP
BURNER
SPUDS
OVEN
BURNERS
THERMOSTAT
AIR
ADJUST
NON SELF-CLEAN X X 1 X X
SELF-CLEAN X X 2 X
COOKTOPS WITH
CONVENTIONAL
BURNERS
XX X
COOKTOPS WITH
SEALED
BURNERS
XX