39
G. GAS
G.2.1. Drip Leg Requirement
When connecting the supply gas to the
gas valve, install a drip leg/sediment trap in
compliance with the International Residential
Code G2419.4.
G.2.2. Purging Gas Line
s
It may be necessary to purge any air from the
gas lines prior to operation. This can be done
through the gas pressure tap on the gas valve or
at a union in the gas line. Follow best practices
to purge the gas line. Ensure all fittings are
sealed and tight after purging.
G.2.3. Leak Testing
To check for gas leaks, use a soap and water
solution or other approved method.
DO NOT
USE AN OPEN FLAME.
WARNING:
DO NOT
use an open flame
to check for leaks. The use of an open flame
can result in fire, explosion, property damage,
personal injury or death.
WARNING:
This unit is equipped at the
factory for use on natural gas only. Conversion
to lp gas requires a special kit supplied by the
distributor or manufacturer. Mailing addresses
are listed on the furnace rating plate, parts
list and warranty. Failure to use the proper
conversion kit can cause fire, carbon monoxide
poisoning, explosion, personal injury, property
damage or death.
NOTE:
The valve can be converted to use
liquefied petroleum (LP) gas by replacing the
high and low fire pressure regulator springs with
the conversion kit springs. The LP kit springs
allow the regulator to maintain the proper
manifold pressure at high and low fire for LP
gas.
NOTE:
Order the correct LP conversion kit from
the furnace manufacturer.
See Conversion Kit Index shipped with unit
and table below for proper LP kit number.
A qualified technician must perform furnace
conversion to LP gas
.
ORIFICE INSTALLATION
LP Gas is a manufactured gas that has
consistent heating value across most regions.
The Sea Level input should still be reduced
by 4% per thousand ft. above 2,000 feet and
the orifice size must be selected based on
the reduced input selection chart in High Alt.
Instruction Section.
To change orifice spuds for conversion to LP:
1. Shut off the gas supply and remove gas
connection to the gas valve.
2. Remove the gas manifold.
3. Replace the natural gas orifices with LP
orifices.
4. Reassemble in reverse order.
5. Refer to section
J.5.1.1. Measuring
and Adjusting Supply Gas Pressures
for
confirming inlet pressure and adjusting manifold
pressure.
WARNING:
LP tanks from local LP
supplier must not be used to store anything
(such as fertilizer) except LP gas. This includes all
delivery vessels (LP trucks). If material other than
LP gas is used in the same vessels/tank as the
LP gas, the LP gas can become contaminated
and damage the furnace. This will void the
manufacturer’s warranty. Contact the supplier to
make sure fertilizer is not used in the same tanks
used to store and deliver LP gas.
ST-1281-01-00
MANUAL GAS SHUT-OFF VALVE
UNION
DRIP LEG
Model Number
Kit Number
U.S./Canadian
(-)GED 150k, 105k, 225 k
FP39
Figure G.2.1. – A: Drip Leg
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