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PILOT FLAME CHARACTERISTICS
The correct pilot flame (Figure 11) will be blue, extending past the
thermocouple. The flame will surround the thermocouple just be
-
low 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 intermit-
tent 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
2
O pressure on Natural gas and 10” H
2
O
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 de-
crease or counterclockwise
to increase pilot
flame. Pilot adjustment is shipped at full flow rate. Turn the
inner adjustment screw clockwise
if the inlet pres-
sure is too high.
3. Replace the cover screw after the adjustment to prevent gas
leakage.
THERMOCOUPLE
BURNER
SPARK
ELECTRODE
PILOT
STANDING PILOT
THERMOCOUPLE
PILOT SHIELD
SPARK
ELECTRODE
PILOT LOCATION END VIEW
STANDING PILOT SHOWN
3/8” TO 1/2”
PILOT FLAME
GROUND
ELECTRODE
BURNER
PILOT
HOT SURFACE
IGNITOR
FLAME
ROD
IP-MODEL PILOT
Figure 11
