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6. Blower Motors and Capacitors
All G60UH(X) units use direct drive blower motors. All mo-
tors are 120V permanent split capacitor motors to ensure
maximum efficiency. Ratings for capacitors will be on motor
nameplate. See SPECIFICATIONS section for motor speci-
fications.
NOTE − Shafts on 1 HP motors have 2 flat sides and are
matched with blower wheels with 2 set screws.
FIGURE 6
SUPPLY AIR BLOWER
AND SECONDARY LIMIT (S)
SECONDARY
LIMIT (S)
CAPACITOR
MOTOR/BLOWER
ASSEMBLY
To Remove Blower From Unit: Disconnect Power, Remove Control
Box, Remove Bolts and Unplug Motor Wires From Control Board.
Then Slide Out Front of Unit.
7. Ignitor
The SureLight ignitor is made of durable silicon nitride. Ig-
nitor longevity is enhanced by controlling voltage to the ig-
nitor. Board 18M34 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
100869 provides a regulated 95 volts to the ignitor for con-
sistent ignition and long ignitor life. Ohm value for ignitors
with SureLight board 18M34 should be 10.9 to 19.7. Ohm
value for ignitors with board 100869 should be 25 to 47.
See figure 7 and 8 (make note of control board used) 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.
8. Flame Sensor
A flame sensor is located on the left side of the burner sup-
port. See figure 9 and 10 (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 removing
any part of the burners. During operation, flame is sensed
by current passed through the flame and sensing elec-
trode. The SureLight control allows the gas valve to remain
open as long as flame signal is sensed.
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