Lennox LGH094U Unit Information page 40

INSTALLATIONS WITH DUCTWORK
ROOFTOP UNIT
RE­
SUPPLY
TURN
MAIN
DUCT RUN
Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if
proper pulley alignment and belt tension are main­
tained. Tension new belts after a 24-48 hour period of op­
eration. This will allow belt to stretch and seat in the pul­
ley grooves. Make sure blower and motor pulleys are
aligned as shown in figure 20.
PULLEY ALIGNMENT
ALIGNED
BELT
MOTOR PULLEY
NOT ALIGNED
FIGURE 20
LOCATION OF STATIC PRESSURE READINGS
RETURN AIR
READING LOCATION
FIRST BRANCH
OFF OF MAIN RUN
SUPPLY AIR
READING
LOCATION
FIGURE 19
BLOWER PULLEY
Page 40
INSTALLATIONS WITH CEILING DIFFUSERS
ROOFTOP UNIT
SUPPLY
SUPPLY AIR
READING DIFFUSER
LOCATION
1- Loosen four bolts securing motor base to mounting
frame. See figure 16 or 17.
2- To increase belt tension -
Turn both adjusting bolts to the right, or clockwise, to
move the motor outward and tighten the belt. This in­
creases the distance between the blower motor and
the blower housing.
To loosen belt tension -
Turn the adjusting bolt to the left, or counterclockwise
to loosen belt tension.
IMPORTANT - Align edges of blower motor base and
mounting frame base parallel before tightening four bolts
on the side of base. Motor shaft and blower shaft must be
parallel.
3- Tighten bolts on side of base.
RETURN AIR
READING
RE­
LOCATION
TURN