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7. Ignitor
The SureLight ignitor is made of durable silicon nitride. Ig-
nitor longevity is enhanced by controlling voltage to the ig-
nitor. Boards 18M49 and 49M59 find the lowest ignitor tem-
perature which will successfully light the burner, thus in-
creasing the life of the ignitor. Due to this feature of the
board, voltage cannot be measured so ignitor must be
ohmed. Board 100870 provides a regulated 95 volts to the
ignitor for consistent ignition and long ignitor life. Ohm val-
ue for ignitors with SureLight boards 18M99 and 49M59
should be 10.9 to 19.7. Ohm value for ignitors with board
100870 should be 25 to 47. See figure 12 and 13 (make
note of control board used) for ignitor location. Ignitors are
not interchangeable between boards.
MEASUREMENT IS TO
5/8
I.D. OF RETENTION
RING
"
13/32'
IGNITOR
BURNERS FRONT VIEW
MEASUREMENT IS TO
5/8
I.D. OF RETENTION
RING
"
7/32'
IGNITOR
BURNERS FRONT VIEW
SureLight Board 18M99 & 49M59 Ignitor Location
BRACKET
FIGURE 12
SureLight Board 100870 Ignitor Location
BRACKET
FIGURE 13
Page 28
NOTE − The G60UHV(X) furnace contains electronic
components that are polarity sensitive. Make sure that
the furnace is wired correctly and is properly grounded.
8. Flame Sensor
A flame sensor is located on the left side of the burner sup-
port. See figure 14 and 15 (make note of control board
used). The sensor is mounted on the flame rollout plate and
the tip protrudes into the flame envelope of the left−most
burner. The sensor can be removed for service without re-
moving any part of the burners. During operation, flame is
sensed by current passed through the flame and sensing
electrode. The SureLight control allows the gas valve to re-
main open as long as flame signal is sensed.
5/16"
BURNERS TOP VIEW
21/64"
BURNERS TOP VIEW
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