Pulley Alignment; Air Volume Adjustment - Lennox T?CLASS TAA SERIES Installation Instructions Manual

Pulley Alignment

Air Volume Adjustment

FIXED
PULLEY
BLOWER
BELT
ADJUSTABLE
PULLEY
NOTE THE INDOOR COIL MUST BE DRY AND THE AIR
FILTERS MUST BE IN PLACE WHEN THE FOLLOWING
MEASUREMENTS ARE TAKEN.
AFTER ANY PULLEY ADJUSTMENT OR CHANGE OUT, PULLEYS
SHOULD BE ALIGNED WITH THE TENSIONER AS SHOWN.
ALIGNED
MOTOR
PULLEY
NOT ALIGNED
Figure 8. Typical Pulley Alignment
Figure 9. Typical Air Volume Adjustment Procedure
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TENSIONER
BELT
BLOWER
PULLEY
1 RUN THE BLOWER WITHOUT A COOLING DEMAND.
2
MEASURE THE STATIC PRESSURE EXTERNAL TO THE UNIT.
3
MEASURE THE INDOOR BLOWER MOTOR'S RPM.
USE THE STATIC PRESSURE AND REV/MIN READINGS TO DETERMINE
4
THE UNIT'S AIR VOLUME (SEE APPLICABLE BLOWER PERFORMANCE
TABLES).
LOOSEN THE ALLEN SCREW ON THE ADJUSTABLE PULLEY.
5
TURN THE ADJUSTABLE SHEAVE CLOCKWISE TO INCREASE THE AIR
6 VOLUME OR COUNTERCLOCKWISE TO DECREASE THE AIR VOLUME.
ONCE THE DESIRED AIR VOLUME HAS BEEN ACHIEVED, TIGHTEN THE
7
ALLEN SCREW.
ADJUSTABLE PULLEY
ALLEN SCREW
TAA SERIES