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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
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
leaking 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
intermittent 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
0
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
to 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.
SPARK
ELECTRODE
THERMOCOUPLE
PILOT
BURNER
STANDING PILOT
PILOT LOC ATION END VIEW
PILOT SHIELD
THERMOCOU PLE
SPARK
ELEC TRODE
STANDING PILOT SHOWN
BURNER
PILOT
HOT SURFACE
IGNITOR
FLAME
ROD
GROUND
ELECTRODE
3/8" TO 1/2"
PILOT FLAME
IP-MODEL PILOT
Figure 11
