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IPG-9
7.
Open the gas ball valve fully. This ball valve should be open fully at all times when the
pilot is burning.
8. The set screw on the air/gas mixer (Figure 2) is used to control the air/fuel ratio of the IPG
pilot. The pilot
MUST
be properly set up prior to use as a burner ignition source. If the pilot is
not set up, it may fail to light burner. The pilot should be set according to the following
procedure with pilot outside of the burner:
1. Ignite the pilot.
2. Loosen the jam nut on the mixer.
3. Rotate the set screw to adjust the mixer to the desired air/fuel ratio; clockwise for
leaner, and counter clockwise for richer.
4. The pilot will be at the proper air/fuel ratio when small flames become visible at the
holes in the pilot nozzle. Some reddening of the pilot nozzle may occur. The flame
should appear short, sharp, and blue. A yellow flame indicates that the mixture is too
rich and adjustment is required for proper ignition.
5. Hold the set screw in place at the desired position and tighten the jam nut.
Figure 2. Pilot Mixer Adjustment
9. To extinguish the pilot:
a. Close gas ball valve first.
b. Close air ball valve last (if desired).
10. Insert a slip-fit pilot into the burner and tighten the setscrew on the burner to lock the pilot
nozzle in place (if applicable).
11. Insert a threaded pilot as follows:
a. Disconnect the union between the pilot nozzle and flex nipple.
b. Thread the pilot into the port and wrench tighten until snug.
c. Reconnect the union.
NOTE
The pilot nozzle tip should be located slightly behind the main burner nozzle
discharge area so that it will not obstruct or be affected by the air/fuel discharge
of the main burner.
S4243
(NOT TO SCALE)
