Dometic DF Serie Instructions D'installation page 21

INSTALLATION
G. Converting The Furnace Gas Type
This section applies to DFLA35 and DFLA40 models only . These models are set up for LP gas at the factory, but can be
converted to natural gas . A natural gas conversion kit is included .
 Any conversion to natural gas must conform with local codes, or in the absence of local codes, with the National Fuel
Gas Code, ANSI Z223 .1/NFPA 54 Natural Gas and Propane Installation Code, in addition to the Standard for Recreational Vehicles
NFPA1192 and CSA Z240 RV Recreational Vehicle Code .
Changing The Adjustment Regulator Caps
Read the following BEFORE proceeding:
• The convertible valve is set for a pressure setting of
3 .5" for natural gas (NAT) and 10 .5" for LP gas . These
settings are not adjustable .
• Do NOT modify the adjustment regulator caps or use
them with any other valve .
FIG. 1
• Unscrew the adjustment regulator cap and remove from
the valve regulator tower . Do NOT remove the rod from
inside the regulator tower or perform any adjustments .
• Place the NAT or LP cap appropriate for the conversion
onto the valve regulator tower .
• Tighten the adjustment regulator cap by hand or use
a small wrench . Do NOT overtighten the adjustment
regulator cap .
• Install the main burner orifice . Refer to the "Conversion
Specifications Table" for information specific to LP or NAT
conversion .
Conversion Specifications Table
GAS
BTU/HR
TYPE PRESSURE
Propane
40,000
(LP)
Natural
40,000
(NAT)
Propane
35,000
(LP)
Natural
35,000
(NAT)
WC = Water Column
Nat Cap
LP Cap
LINE REGULATOR
CAP SETTING
10 .5" WC
11" WC
3 .5" WC
7" WC
10 .5" WC
11" WC
3 .5" WC
7" WC
Replacing The Orifice
Read the following BEFORE proceeding:
• Each Furnace is supplied with two main burner orifices .
One is installed on the manifold and the other is
attached to the blower housing cover .
• The type of gas in use must match the adjustment
regulator cap and orifice installed in the Furnace .
FIG. 2
Gas Connection
Valve
Regulator
Tower
• Disconnect the gas line from the valve .
• Remove the three screws holding the burner assembly to
the back wall of the control box .
• Remove the two screws holding the burner to the manifold .
• Unscrew the orifice using a 7/16" wrench or socket .
• Use the "Conversion Specifications Table" to select the
correct orifice needed for the gas type .
• Install the new orifice .
• Reverse steps 1–3 to reinstall the burner, burner assembly,
and the gas line .
• Test gas connections for leakage with a commercially
available soap solution made specifically for the detection
of leaks .
• Place the "converted" sticker (provided) in a visible
DRILL
SIZE
location, next to the model number label .
49P
#30
#51
#30
21
Burner
Assembly
Orifice