18
Converting to LP/Propane Gas at Altitudes
between 0 & 10,000 FT.
WARNING:
The furnace was shipped from the factory
equipped to operate on natural gas. Conversion
to LP / Propane gas must be performed by
qualified service personnel using a factory
supplied conversion kit. Failure to use the
proper conversion kit can cause fire, explosion,
property damage, carbon monoxide poisoning,
personal injury, or death.
Converting single stage valves to LP/Propane requires
the replacement of the burner orifices and flipping the
regulator cap to the side marked LP. The end facing up
should now read LP. See Figure 13.
WARNING:
Shut off the gas supply at the manual gas shutoff
valve, before disconnecting the electrical power.
A fire or explosion may result causing property
damage, personal injury or loss of life. Failure to
follow the safety warnings exactly could result
in serious injury, death or property damage.
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect
or the main service panel before making any
electrical connections.
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished
with factory supplied orifices. Do not attempt to
drill out orifices in the field. Improperly drilled
orifices may cause fire, explosion, carbon
monoxide poisoning, personal injury or death.
Installation Example
Elevation:
.................................................. 5,000 feet
Type of Gas:
........................................... Natural Gas
Local Heating Value of Gas:
..............................
750
From Table 10, find 750 and follow down the column,
stop at the 5,000 feet row. The heating value listed is
LOW. Table 12 will be used to determine orifice size and
manifold pressure.
For added flexibility, two tables have been provided for
natural gas installations with high or low heating values at
sea level. Tables 11 and 12 (page 31) contain the manifold
pressure and orifice sizes to use at various altitudes. Table
11 (HIGH) is for natural gas installations with a heating
value of more than 1,000 Btu per cubic foot and Table
12 (LOW) is for less than 1,000 Btu per cubic foot. To
determine which table to use:
1. Consult the local utility for the local heating value at
your installation site.
2. From Table 10 (page 31), find your local heating value
as supplied by the utility company. Follow down the
column and stop at your altitude level.
3. If your sea level heating value is HIGH, use Table 11
or if it’s LOW, use Table 12. See example below.
After changing the orifices, it is required that you measure
the gas input rate. This may be accomplished in the usual
way, by clocking the gas meter and using the local gas
heating value. See Verifying and Adjusting the Input Rate
section (page 23).
IMPORTANT NOTE: Observe the action of the burners
to make sure there is no yellowing, lifting or flashback
of the flame.
Inlet
Pressure
Tap
Manifold
Pressure Tap
On / Off Knob
Terminal
Connectors
N
AT N
AT
L
P
L
P
OR
OTHER SIDE
OF CAP
Regulator Cap
Figure 13. Gas Valve
