Heating Components; Ignitor; Flame Sensor; Surelight Board 49M59 Ignitor Location - Lennox G61MPV Service Manual

C−Heating Components

6. Ignitor

The SureLight ignitor is made of durable silicon nitride. Ig-
nitor longevity is enhanced by controlling voltage to the ig-
nitor. Board 49M59 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. Board
100870 provides a regulated 95 volts to the ignitor for con-
sistent ignition and long ignitor life. Ohm value for ignitors
with SureLight board 49M59 should be 10.9 to 19.7. Ohm
value for ignitors with board 100870 should be 25 to 47. Ig-
nitors not interchangeable between boards. See figure 12
and 13 (make note of control board used) for ignitor loca-
tion.
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 49M59 Ignitor Location

BRACKET
FIGURE 12
SureLight Board 100870 Ignitor Location
BRACKET
FIGURE 13
Page 42
NOTE − The G60DFV(X) furnace contains electronic
components that are polarity sensitive. Make sure that
the furnace is wired correctly and is properly grounded.

7. 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