L.B. White I-40 Infraconic Spark Ignition - Manual (Page 17)

16
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 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 needle nose pliers or a standard screwdriver,
carefully pry up the outer combustion cones tabs folded
under the burner plate. See Fig.16.
FIG. 16
2. Rotate the outer cone slightly so the notches in the
cone flange align to the formed retainers on the burner
plate. Lift and pull the cone from the burner.
plate. See Fig.17.
FIG. 17
3. Inspect the inner cone. See Fig.18. 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 control end of the venturi tube.
FIG. 18
4. If the inner cone is damaged, remove the three screws,
nuts, and spacers securing the burner plate to the
heater. See Figs.18 and 19.
FIG. 19
5. Remove the burner plate and replace the inner cone.
See Fig.20. 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. 20
6. When reassembling, ensure:
-- Inner cone weld seam aligns to burner plate notch.
See. Fig.20.
-- All burner nuts and screws are securley tightened.
-- Cone weld seams are aligned as shown in Fig.21
before final installation.
-- Outer cone flange is positioned under all retainers.
-- Cone tabs are secured to the burner plate.
FIG. 21
BURNER COMBUSTION CONES and GASKET
NOTCH
NOTCH
WELD SEAM
GASKET
SCREWS
TIP
WELD SEAM
INNER CONE
OUTER CONE TABS
RETAINER
NUT AND SPACER
WELD SEAMS
ALIGNED
NOTCHES ALIGN
TO RETAINERS