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Burner and Burner Orifice
Servicing
Instructions
8. Disconnect the wires from the gas control valve,
burner casting ground wires, igniter, and flame sensor
wires.
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 down through the slot at
the top of the casting, moving it around vigorously to
dislodge any blockages. Be ccareful nnot tto ddamage tthe
igniter. Blow out again 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.
August 1999
8.9-2
2
Heaters w
with B
Burner PPlates:
1. Shut off the gas supply to the heater and disconnect
the heater’s electrical supply. Allow heater to cool.
2. To remove the burner plate, loosen the compression
fitting at the throttle valve outlet.
3. Remove only the screw in the 12 o’clock position
above the orifice and simply lift the burner plate from
its position to view the burner orifice on the opposite
side of the burner plate.
Orifice