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6. Flame Sensor
A flame sensor is located on the left side of the burner sup-
port. See figure 6. The sensor is mounted on the flame rol-
lout plate and the tip protrudes into the flame envelope of
the left−most burner. The sensor can be removed for ser-
vice without removing any part of the burners. During op-
eration, flame is sensed by current passed through the
flame and sensing electrode. The SureLight control allows
the gas valve to remain open as long as flame signal is
sensed.
FIGURE 6
NORMAL FLAME SIGNAL > 0.23 MICROAMPS
LOW FLAME SIGNAL < 0.22 MICROAMPS
DROP OUT SIGNAL = 0.16 MICROAMPS
5/16"
7. Ignitor
The SureLight ignitor is made of durable silicon nitride. Ig-
nitor longevity is enhanced by controlling voltage to the ig-
nitor. The board finds the lowest ignitor temperature which
will successfully light the burner, thus increasing the life of
the ignitor. Due to this feature of the board, voltage cannot
be measured so ignitor must be ohmed. Ohme value
should be 10.9 to 19.7. See 7 for ignitor location.
NOTE − The G60UH(X) furnace contains electronic
components that are polarity sensitive. Make sure that
the furnace is wired correctly and is properly grounded.
FIGURE 7
5/16"
13/32’
5/8"
SureLight Ignitor Location
BURNERS TOP VIEW
BURNERS FRONT VIEW
MEASUREMENT IS TO I.D.
OF RETENTION RING
IGNITOR
BRACKET
