Blower Operation And Adjustments - Lennox LGH480 Installation Instructions Manual

BLOWER
MOTOR
PULLEY
MOTOR
SUPPORT
PLATE

Blower Operation and Adjustments

IMPORTANT
Three phase scroll compressors must be phased se­
quentially for correct compressor and blower rota­
tion. Follow "COOLING START-UP" section of instal­
lation instructions to ensure proper compressor and
blower operation.
A-Blower Belt Adjustment
Maximum life and wear can be obtained from belts only if
proper pulley alignment and belt tension are maintained.
Tighten belt as shown in figure 25.
IMPORTANT
After a 24-48 hour period of operation, tighten new
belts again. This will allow belt to stretch and seat
into grooves.
Make sure blower and motor pulley are aligned as shown in
figure 26. Also make sure motor support plate is level. See
figure 27.
507232-04 7/2017
BLOWER ASSEMBLY
BELT TENSION
ADJUSTMENT
BOLTS
FIGURE 25
Page 19
UPPER
ADJUSTMENT
NUT
TO LOOSEN BELT
Turn upper nut on both ad­
justment bolts counter­
clockwise. Secure support
plate with lower nuts.
PULLEY ALIGNMENT
ALIGNED
BLOWER
BELT
PULLEY
NOT ALIGNED
FIGURE 26
BLOWER MOTOR SUPPORT PLATE
Measure the position of the nuts on the adjusting
screw to make sure the support plate is level.
Tighten upper and lower adjustment nuts.
FIGURE 27
LOCKWASHER
LOWER
ADJUSTMENT
NUT
TO TIGHTEN BELT
Turn lower nuts on both
adjustment bolts clock­
wise. Secure support
plate with upper nuts.
MOTOR
PULLEY