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The correct pilot flame (Figure 11) will be blue, extending past
the thermocouple. The flame will surround the thermocouple just
below the tip.
Natural gas pilots require adjusting when the inlet gas pressure is
above 5" w.c. (1.245kPa). Remove the pilot cover screw on the
control valve (Figure 3), and turn the adjustment screw clockwise
to reduce flame. Replace pilot cover screw to eliminate gas leak-
ing at that control valve opening.
LP gas (Propane) will not require adjustment.
After use, cleaning may be required for the proper flame.
IP-Model Pilot
This heater is using a Honeywell "Smart Valve" system for inter-
mittent pilot ignition.
On a call for heat by the thermostat, this control turns on a 24 volt
mini hot surface ignitor which lights a pilot that in turn lights the
main burner. The gas valve used in this system is a step opening
which opens at a lower pressure for ignition and then steps to a
full inlet pressure of 4" H
O pressure on Natural gas and 10" H
2
pressure on LP gas.
Pilot Flame Adjustment
The pilot flame should envelop 3/8 to 1/2 inch (10 to 13mm) of
the tip of the flame rod. See Figure 11.
To adjust:
1. Remove the pilot adjustment cover screw.
2. Turn the inner adjustment screw clockwise
to decrease or counterclockwise
increase pilot flame. Pilot adjustment is shipped at full flow
rate. Turn the inner adjustment screw clockwise
if the inlet pressure is too high.
3. Replace the cover screw after the adjustment to prevent gas
leakage.
Page 14
PILOT FLAME CHARACTERISTICS
t o
SPARK
ELECTRODE
STANDING PILOT
THERMOCOUPLE
SPARK
ELECTRODE
O
2
PILOT LOCATION END VIEW
STANDING PILOT SHOWN
3/8" TO 1/2"
PILOT FLAME
PILOT
HOT SURFACE
IGNITOR
THERMOCOUPLE
BURNER
PILOT
PILOT SHIELD
GROUND
ELECTRODE
BURNER
FLAME
ROD
IP-MODEL PILOT
Figure 11
12430-12-0709
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