© 2022 Staheli West
225
1. Thread the inner pipe into the nozzle block (Overtightening can block fuel flow).
2. Thread the outer pipe into the tee fitting (2015 machines) or cross fitting (2016+ machines).
3. Insert the inner pipe assembly into the outer pipe assembly by threading the end of the outer pipe
into the nozzle block (Overtightening can block fuel flow). At this point the end of the inner pipe
should extend beyond the end of the tee/cross fitting by 5/16 - 3/8”.
4. Place the O-ring into the O-ring groove on the inside surface of the isolation fitting. Important:
Lubricate O-ring with a thin layer of oil so that the inner pipe will slide easily through the O-ring
without rolling it out of the O-ring groove.
5. Thread the isolation fitting into the tee/cross fitting until the end of the inner tube nearly bottoms
out or softly mates with the flat surface of the isolation fitting. The goal is to get the beveled end
of the inner tube well beyond the O-ring to ensure a positive seal between the O-ring and the outer
surface of the inner tube. NOTE: The position of the end of the inner tube can be checked visually
by shining a flashlight into the open end of the isolation fitting. If the surfaces do not mate, then
there is not enough inner pipe extending beyond the end of the tee fitting. This can be corrected by
tightening the tee fitting onto the outer pipe further, thereby shortening the overall length of the
outer pipe.
6. Install the elbow/tee fitting onto the end of the now assembled burner gun and connect fuel supply
fittings.
Test 22: Burner Gun Assembly Instructions
Tests
5/16 - 3/8”
Outer Pipe
Inner Pipe
O-ring
Isolation
Fitting
Nozzle Block