Dometic DF Serie Instructions D'installation page 20

INSTALLATION
F. Connecting The Gas
 FIRE OR EXPLOSION HAZ ARD . Failure to obey the following warnings could result in property damage, serious injury,
or death:
• Install gas connections in compliance with the applicable supplemental directives listed in this manual . Refer to
"C . Supplemental Directives" on page 2 .
• NEVER use an open flame to check for gas leaks . Use a commercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in these instructions .
• Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the Furnace before shutting off the
electrical supply .
• Do NOT put sealing compound on flare fittings .
FIG. 1
(Rear)
Gas Connection
An extended manifold is used in this example; however,
the use of tubing or other variations to connect the gas is
acceptable .
• Treat all male pipe threads, other than flare fittings, with a
sealing compound resistant to a chemical reaction with LP
gas .
• Remove the grommet plug from the Furnace and install on
the gas line .
• Insert the gas line through the hole in the top of the casing .
• Connect the gas line to the fitting located on the valve . If
the Furnace is supplied with an extended manifold,
connect the gas line at the rear of the Furnace .
• Reinstall the grommet plug on the casing, as it is a required
air seal . DO NOT CUT .
• Use two wrenches to hold the valve and flare nut, and
tighten the flare nut over the gas line .
• Torque the fitting to 20–22 ft . lbs . Do NOT twist the valve
out of position when tightening the gas line .
For DFLA35 and DFLA40 models only, a gas conversion kit
is included with your Furnace . To convert the Furnace gas
type, proceed to "G . Converting The Furnace Gas Type" on
page 21 .
Extended
Manifold
LP Gas Pressure Test
Read BEFORE proceeding:
• Test all piping systems BEFORE connecting the
Furnace .
Grommet
• Disconnect the Furnace and any individual shut-off
Plug
valves from the gas supply piping system when
pressure testing the system at pressures of more than
1/2" PSI .
• If local codes allow the use of a flexible gas appliance
connector, do NOT use a connector which has
previously serviced another gas appliance .
• For gas conversions only, a 1/8" NPT plug is provided
upstream of the gas connections for checking the gas
pressure .
• Perform an air pressure test on the piping system . The test
must maintain an air pressure of a least 6" of mercury or
3 PSI for at least 10 minutes .
• Adjust the piping system to maintain the minimum gas
supply pressure listed on the rating plate, when all
appliances are in operation .
• Test gas connections for leakage with a commercially
available soap solution made specifically for the detection
of leaks .
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