Daikin Vision CAH 003-090 C Installation And Maintenance Manual page 39

LVP Variable Speed Sheaves
Mounting:
1 . Slide sheave on motor shaft so that the side of the
sheave with setscrew A is next to the motor when
setscrew A is in the hub or barrel of the sheave .
2 . When setscrew A is at an angle in the center flange B,
mount it away from the motor so that the outer locking
ring and flange can be removed to get to the setscrew.
3 . To remove the flange and locking ring:
a . Loosen setscrews D .
b . Loosen but do not remove capscrews E .
c . Remove key F .
NOTE: This key projects a small amount to provide a grip for
removing .
d . Rotate the flange counterclockwise until it
disengages the threads on the sheave barrel .
4 . Verify that the driving and driven sheaves are in
alignment and the shafts are parallel. When aligning two-
groove sheaves, allow room between the sheave and
motor to access capscrews E .
5 . Insert key C between the sheave and the shaft and
tighten setscrew A securely .
6 . If flange and locking ring have been removed, when
replacing them make sure that the inner and outer
flanges are open from the closed position by the same
amount as the other flange. Determine this by accurately
measuring the top width of the grooves.
7 . Insert key F .
8 . Tighten setscrews D and capscrews E .
9 . Put on belts and adjust belt tension . Do not force belts
over grooves . See Fan Drive
10 . Before starting the drive, ensure that all keys are in
place and all setscrews and all capscrews are tight.
Check and retighten all screws and retension belts after
approximately 24 hours of service .
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Belt .
39
Adjusting:
1 . Slack off belt tension if belts have been installed .
2 . Loosen setscrews D .
3 . Loosen but do not remove capscrews E .
4 . Remove key F .
NOTE: This key projects a small amount providing a grip for
removing .
5 . Adjust pitch diameter by opening or closing the movable
flanges by half or full turns.
NOTE: Two-groove sheaves are supplied with both grooves
set at the same pitch diameter . To provide the same
pitch diameter for satisfactory operation, move both
movable flanges the same number of turns. Do not
open sheaves more than five turns for A belts or six
turns for B belts .
6 . Replace key F .
7 . Tighten setscrews D and capscrews E
8 . If belts have been installed, readjust belt tension . If belts
have not been installed, install them and adjust belt
tension . Do not force belts over grooves . See
Drive Belt on page 42 .
9 . Before starting the drive, ensure that all keys are in
place and all setscrews and all capscrews are tight.
Check and retighten all screws and retension belts after
approximately 24 hours of operation .
10 . Replace variable speed sheaves for 15 hp motors and
greater with a fixed pitch sheave after air balancing to
maintain fan balance integrity . Fixed sheaves furnished
by others .
IM 672-11 • VISION AIR HANDLING UNIT
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aInTenanCe
Fan