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pressure and orifice sizes to use at various altitudes. Table
13 (HIGH) is for natural gas installations with a heating
value of more than 1,000 Btu per cubic foot and Table
14 (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 12 (page 41 ), 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 13
or if it's LOW, use Table 14. See example.
After changing the regulator pressure or 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 (page 31).
IMPORTANT NOTE: Observe the action of the burners
to make sure there is no yellowing,
lifting or flashback
of the flame.
INSTALLATION
EXAMPLE
Elevation:
...................................................
5,000 feet
Type of Gas: ............................................
Natural Gas
Local Heating Value of Gas: ............................... 750
Determine which natural gas table to use. From Table
11, find 750 and follow down the column, stop at the
5,000 feet row. The heating value listed is LOW. Table
13 will be used to determine orifice size and manifold
pressure.
Conversion
to LP/Propane
WARNING:
This
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
factory
supplied
conversion
parts.
Failure
to use the
proper conversion
kit can cause fire, explosion,
property
damage,
carbon
monoxide
poisoning,
personal
injury, or death.
This furnace can be converted from factory-equipped
natural gas to Liquid Propane gas. Conversion
of this
valve requires replacement of the burner orifices on the
manifold assembly. The orifices required for conversion
are supplied with the furnace.
For altitudes between 0 and 1,999 feet, only the orifice is
changed. Altitudes between 2,000 and 10,000 feet require
both the orifice and regulator pressure to be changed.
See Table 11 (page 41) to determine the correct orifice
size and manifold pressure to use at different altitudes.
WARNING:
Shut offthegassupplyat
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.
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.
1. Remove the burner orifices (Figure 34):
a. Adjust the thermostat to the "OFF" position, or its
lowest temperature
setting.
b. Turn the main gas supply valve (on the outside of
the unit) to the OFF position.
c. Turn off all electrical power to the furnace.
d. Remove the door from the burner compartment.
e. Turn the gas valve ON/OFF knob (1) to the OFF
position.
Figure 34. Burner and Manifold Assembly
CAUTION:
it is good
practice
to
label
all
wires
prior
to
disconnection.
Wiring
errors
can
cause
improper
and dangerous
operation.
f. Disconnect the wires from the terminals (2).
g. Remove the supply gas piping from the gas valve
inlet (3).
25
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