L.B. White I-17 Infraconic - Manual (Page 17)

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
nuts, (see Fig.18) ensures that the heater operates to
normal combustion characterisitics.
FIG. 18
If not cleaned, the venturi tube and inner combustion
cone will become blocked, creating poor combustion,
gas backflashing through the air housing, or outages.
This may require some disassembly if the blockage
cannot be removed by normal cleaning methods. Refer
to the following instructions.
1. Using pliers,straighten the tab on the truss clip. See
Fig.18. The clip will drop to the cone side of the heater.
2. Disconnect the thermocouple from the safety control.
Remove the thermocouple sensor’s retaining clip and
screw, and pull the air housing with safety control from
venturi tube. See Fig.19.
FIG. 19
3. Pull the outer cone from the retainer slots in the burner
plate. See Fig.20.
FIG. 20
4. Inspect the inner cone. See Fig.21. If the cone is in
good condition, (cone weld seam not split or tip is not
missing) then clean using the compressed air method.
A bottle brush may also be run down the venturi tube to
force out any blockages. Using air at the cone end, blow
back any debris out the safety control end of the venturi
tube.
5. If the inner cone is damaged, remove the three screws,
nuts, and spacers securing the burner plate to the
heater. See Fig.21
FIG. 21
6. Remove the burner plate and replace the inner cone.
See Fig.22. A replacement gasket must be installed
whenever the inner cone is removed. Clean the surface
to which the gasket is located before installing
replacement.
FIG. 22
7. When reassembling, ensure:
-- Inner cone weld seam aligns to burner plate notch.
See. Fig.22.
-- All burner nuts and screws are securley tightened.
BURNER COMBUSTION CONES and GASKET
NUT
TRUSS CLIP TAB
SLOT
SCREW
NOTCH
WELD SEAM
GASKET
VENTURI TUBE
AIR HOUSING RETAINING CLIP AND
SCREW
DISCONNECT THERMOCOUPLE AT SAFETY
CONTROL VALVE
TIP
WELD SEAM
17
INNER CONE