Lennox LHT Series Service Manual page 25

TO INCREASE CFM
LOOSEN ALLEN SCREW &
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
BLOWER
ASSEMBLY
SLIDING BASE
LOOSEN (4) SCREWS TO
ADJUST BELT TENSION
SIDE VIEW
MOTOR
D-Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if
proper pulley alignment and belt tension are maintained.
Tension new belts after a 24-48 hour period of operation.
This will allow belt to stretch and seat into pulley grooves.
Make sure blower and motor pulley are aligned. See fig-
ure 13 for blowers not equipped with a tensioner and fig-
ure 14 for units equipped with an optional belt tensioner.
Blowers Without Belt Tensioner
1 - Loosen four screws securing blower motor to sliding
base. See figure 12.
2 - To increase belt tension -
Turn belt tension adjusting screw to the left, or
counterclockwise, to tighten the belt. This increases
the distance between the blower motor and the
blower housing.
3 - To loosen belt tension -
Turn the adjusting screw to the right, or clockwise to
loosen belt tension. 3- Tighten four screws securing
blower motor to sliding base once adjustments have
been made.
BLOWER ASSEMBLY - NO TENSIONER
BELT TENSION
ADJUSTING
SCREW
BLOWER
MOTOR
ALLEN
SCREW
PULLEY
FIGURE 12
Page 25
TO INCREASE BELT TENSION
1-Loosen four screws securing blower motor to
sliding base.
clockwise, to move the motor downward and
tighten the belt.
3-Tighten four screws.
BLOWER
WHEEL
PULLEY
REMOVE SCREWS TO
SLIDE BLOWER
ASSEMBLY OUT OF UNIT
PULLEY ALIGNMENT - NO TENSIONER
ALIGNED
MOTOR
BELT
PULLEY
NOT ALIGNED
FIGURE 13
BLOWER
PULLEY