I-40 Manual and Spark Ignition
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Owner’s Manual • I-40
22
BURNER ORIFICES
■
Ori
fi
ce sizes are stamped on the
fl
at of ori
fi
ce
hex, indicating size in millimeters. (Example: 44 is
0.44 mm for LP primary ori
fi
ce.) See Fig.20, and
table below.
■
If ori
fi
ces are reversed combustion characteristics
of the heater will change on low
fi
re.
1. Loosen the thermocouple nut at the safety
control valve, and remove the auto reset’s
retaining screw and clip. See Fig. 15.
FIG. 15
2. Pull the air housing from the venturi tube to allow
access to ori
fi
ces.
3. Using a 6 mm hex nut driver, remove the ori
fi
ce.
Clean or replace if needed.
4. When reinstalling, do not overtighten as thread
damage may occur.
FIG. 16
BURNER COMBUSTION CONES
AND GASKET
Very little servicing is required for the combustion
cones and gasket. Routine cleaning is suf
fi
cient to
ensure that the cones remain unblocked by dust
and dirt. Periodic tightening of the the three burner
plate nut ensures that the heater operates to normal
combustion characterisitics.
If not cleaned, the venturi tube and inner combus-
tion cone will become blocked, creating poor com-
bustion, gas back
fl
ashing through the air housing,
or outages. This may require some disassembly if
the blockage cannot be removed by normal (air)
cleaning methods. Refer to the following instruc-
tions.
ORIFICE SIZE
Model
and Heat
Output
Fuel
Type
Second-
ary Orifi ce
(Upper)
Primary
Orifi ce
(Lower)
I-40 (40,000
BTUH)
Butane /
Propane
64
63
Air Housing
Secondary Ori
fi
ce
(High Heat)
Primary Ori
fi
ce
(Low Heat)
Auto Reset Retaining
Clip and Screw
Venturi Tube
Loosen thermocouple nut connected
to safety control valve
