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PILOT GAS ADJUSTMENT
If the pilot flame is low and does not engulf the bulb of the
mercury flame sensor, the system will not energize the
main valve. If pilot gas pressure is too high, gas will sputter
past the ignition electrode, and may not ignite. High pilot
gas pressure may also cause the flame to lift off the
burner, causing the flame sensor bulb to sense "low" heat.
To adjust the pilot gas pressure:
Remove the cover screw (see fig. 4).
To REDUCE pilot pressure, turn the pilot adjust screw
(beneath the cover screw) clockwise.
To INCREASE pilot pressure, turn the pilot adjust
screw counterclockwise.
Replace and tighten cover screw.
ADJUSTMENT
Pilot Adjust
Cover Screw
Gasket
Pilot
Adjust
Screw
Figure 4. Pilot gas adjustment
PILOT LIGHTING
Before lighting the pilot burner flame, remove one of pilot
generator leads from the valve. This will prevent main gas
valve from opening during the pilot lighting procedure,
even if thermostat should be calling for heat.
If you need further information about this product, please write to
White-Rodgers Division, Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attention: Technical Service Department