Burner Orifices; Burner Combustion Cones And Gasket - L.B.White I-17 Manual Del Usuario E Instrucciones

BURNER ORIFICES

■ Orifice sizes are stamped on the flat of orifice
hex, indicating size in millimeters. (Example: 44 is
0.44 mm for LP primary orifice.) See Fig.20, and
table below.
ORIFICE SIZE
Model Fuel
and Heat Type
Output
I-17 (17,100 L.P. Gas
BTUH)
Natural Gas
I-40 (40,000 L.P. Gas
BTUH)
Natural Gas
■ If orifices are reversed combustion characteristics
of the heater will change on low fire.
1. Loosen the thermocouple nut at the safety
control valve, and remove the auto reset's
retaining screw and clip. See Fig. 19, I-17 shown.
FIG. 19
Air Housing
Loosen thermocouple nut connected
to safety control valve
2. Pull the air housing from the venturi tube to allow
access to orifices.
3. Using a 6 mm hex nut driver, remove the orifice.
Clean or replace if needed.
4. When reinstalling, do not overtighten as thread
damage may occur.
I-17 / I-40 Manual and Spark Ignition
Second- Primary
ary Orifice Orifice
(Upper) (Lower)
44 44
61 52
68 63
84 79
Auto Reset Retaining
Clip and Screw
Venturi Tube
Owner's Manual • I-17 / I-40
FIG. 20
Secondary Orifice
(High Heat)
BURNER COMBUSTION CONES
AND GASKET
Very little servicing is required for the combustion
cones and gasket. Routine cleaning is sufficient 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 backflashing 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.
OUTER CONE REMOVAL - I-17
a. Using pliers,straighten the tab on the truss clip.
See Fig. 21. The clip will drop to the cone side of
the heater.
FIG. 21
Truss Clip Tab
23
Primary Orifice
(Low Heat)
Nut