Service and Maintenance
www.DaikinApplied.com 49
IM 782-12 • DESTINY AIR HANDLERS
MVP Variable Speed Sheaves
Mounting:
1. Verify that both driving and driven sheaves are in
alignment and the shafts are parallel. The centerline of
the driving sheave must be in line with the centerline of
.
2. Before starting drive, verify that all setscrews are torqued
. Check
setscrew torque and belt tension after 24 hours of service.
Adjusting:
1. Adjust motor base forward to release belt tension. For
easier adjustment, remove the belts.
2. Loosen, but do not remove both of the locking setscrews
A in the outer locking ring by using a hex key or torque
wrench with a hex bit.
3. Adjust sheave to desired pitch diameter by turning the
outer locking ring. Use a spanner wrench or drift inserted
into the three holes that are located 120° apart on the ring.
4. Any pitch diameter can be obtained within the sheave
range. One complete turn of the outer locking ring
changes the pitch diameter 0.233".
5. Do not open sheaves more than the following amounts:
—
Do not open B sheaves more than 4, 3/4 turns for the
A belts or 6 turns for the B belts.
—
Do not open C sheaves more than 9 1/2 turns.
—
Do not open 5V sheaves more than 6 turns.
—
Do not open 8V sheaves more than 8 turns.
6. Before operating the drive, tighten BOTH locking screws
A in the outer locking ring. Use a torque wrench and
.
7. Replace belts and adjust the motor base to tension the
belts properly. See
Fan Drive Belt Adjustment on page
8. Do not loosen any screws other than the two locking
screws A in the outer locking ring when adjusting the
sheave pitch. Do not operate the drive until the locking
screws are set to the torque specifications.
Figure 51: MVP Type Sheave Adjustment
Adjustable
center-flange
Fixed
center-flange
Stationary
end-flange
Capscrews
(Do not remove.)
(2) Locking
set screws A
Flathead socket screws
(Do not remove.)
Inner locking-ring
Outer
locking-ring
Split taper
bushing
(3) Holes for
spanner wrench
or drift
