Daikin Maverick II MPS062E Installation And Maintenance Manual page 76

MVP Variable Pitch Sheaves
Do not loosen any screws other than the two locking screws (A) in the outer
locking ring. Before operating the drive, securely tighten these screws.
Adjusting:
1. Slack off belt tension by moving the motor toward the
driven shaft until the belts are free from the grooves. For
easiest adjustment, remove the belts.
2. Loosen both locking screws A in outer locking ring, but
do not remove them from the sheave. There is a gap
of approximately 1/2ʺ (1 mm) between the inner and
outer locking rings. This gap must be maintained for
satisfactory locking of the sheave.
If locking screws A are removed by accident and the gap
is lost, screw the outer locking ring down until it touches
the inner locking ring. Then back off the outer ring 1/2 to
3/4 turn until the inner and outer ring screw holes line up.
Reinsert locking screws A, but do not tighten them until
after adjustment is made.
Figure 71: MVP Variable Pitch Sheaves (Type A-B)
Figure 72: MVP Variable Pitch Sheaves (Type C)
IM 991-2 • MAVERICK II ROOFTOP
CAUTION
Check, Test, and Start Procedures
3. Adjust the sheave to the desired pitch diameter by
turning the outer locking ring with a spanner wrench. Any
pitch diameter can be obtained within the sheave range.
One complete turn of the outer locking ring will result in
a 0.233ʺ (6 mm) change in pitch diameter.] Do not open
A–B sheaves more than four 3/4 turns for A-type belts
or 6 turns for B-type belts. Do not open C sheaves more
than nine 1/2 turns.
4. Tighten both locking screws A in the outer locking ring.
5. Put on the belts and adjust the belt tension. Do not force
belts over grooves. Loosen the belts by adjusting the
motor base closer to the fan shaft.
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