L.B. White Pilot - Manual (Page 71)

Burner and Burner Orifice
Servicing
Instructions
7. Remove the two screws and spacers located at the
right and left hand top of the burner casting (if
applicable).
8. Disconnect the electrical leads, pilot line, and
thermocouple from the gas control valve.
9. Remove the burner and valve/manifold assembly from
the heater. Some larger models may require you to
pivot the valve and manifold assembly to remove the
orifice from beneath the burner.
10. Hold the burner casting up to a light. If it appears
plugged, then use compressed air to try and remove
the blockage. If this is not successful, straighten a
wire coat hanger and push it up from the gas inlet end
of the casting, moving it around vigorously to dislodge
dust, dirt, insect nests, etc. Blow out with compressed
air.
11. Check the orifice for external build up of dust. Brush
or blow off as necessary. If it still appears plugged,
remove and inspect the burner orifice. Blow out the
orifice hole with compressed air until the hole is open.
Also, inspect the manifold area into which the orifice
was threaded to make sure there aren’t any
blockages. If necessary, remove that portion of the
manifold and clean it also.
12. Reassemble all components. Use pipe thread
compound on threaded connections.
13. Restart the heater. Check for proper burner flame
characteristics and for gas leaks.
Orifice
8.8-2 2
August 1999
Screw