Page 14
Units may be equipped with either flush style or extended
(masted) limit (figure14). Masted limits may be installed
with limit facing blower or away from blower. This orienta-
tion cannot be changed. Whenremoving limit fromunit,pay
careful attention to its orientation and make sure limit is re-
installed facing same direction.
H-Pilot, Spark Electrode, Flame Sensor
and Burners (-1 Through -4 Models)
Figure 17 shows the arrangement of pilot, flame sensor,
spark electrode and burners. The ignition control uses di-
rect spark to ignite the pilot. The pilot ignites the burners
and the burners cross-light. The flame sensor uses flame
rectification to sense ignition. The ignition control requires
that pilot flame must be sensed before the main gas valve
is allowed to open. Typically, a 2 to 4 second delay occurs
between the pilot ignition and the main valve opening.
Figure 16 shows the gap between tip of the electrodes and
the burner surface. It is important that the gap be main-
tained for consistent ignition of pilot flame.
A flame retention ring in the end of each burner is used to
maintain correct flame length and shape and to keep the
flame from lifting off the burner head. In addition, the burn-
er entrance to each clamshell (Figure 3) is fitted with a
flame baffle or corbel to enhance the combustion process.
FIGURE 15
TYPICAL BURNER ASSEMBLY
FIGURE 16
PILOT, SPARK ELECTRODE AND FLAME SENSOR
1/8 (.125) Inch + ”1/32 (.031)
SPARK ELECTRODE
FLAME SENSOR
PILOT
PILOT HOOD
GAP
SPARK WIRE
SENSE WIRE
FIGURE 17
G23(X)-1, -2, -3 AND -4 MODELS BURNER PILOT/ELECTRODE
ORIENTATION
view looking at side of burners
ORIFICE
RETAINER
PRIMARY
AIR INLET
BURNER
PILOT MOUNTING
BRACKET
FLAME SENSOR
SPARK
ELECTRODE
PILOT HOOD
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