100
McQuay IM 987
Check, Test, and Start Procedures
Mounting and Adjusting Motor Sheaves
VM and VP Variable Pitch Sheaves
Mounting:
1
Mount all sheaves on the motor shaft with setscrew
A
toward the motor (see
Figure 113, page 100
).
2
Be sure both the driving and driven sheaves are in
alignment and that the shafts are parallel.
3
Fit internal key
D
between sheave and shaft and lock
setscrew
A
securely in place.
Adjusting:
1
Slack off all 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 setscrews
B
and
C
in the moving parts of the
sheave and pull out external key
E
(see
Figure 113,
page 100
). This key projects a small amount to provide a
grip for removing.
3
Adjust the sheave pitch diameter for the desired fan
speed by opening the moving parts by half or full turns
from closed position.
Do not open more than five full
turns for
A
belts or six full turns for
B
belts.
Adjust
both halves of two-groove sheaves by the same number
of turns from closed to ensure that both grooves have the
same pitch diameter.
4
Replace external key
E
and securely tighten setscrews
B
over the key. Tighten setscrews
C
into the keyway in the
fixed half of the sheave.
5
Put on 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.
6
Be sure that all keys are in place and that all setscrews
are tight before starting the drive. Check the setscrews
and belt tension after 24 hours of service.
Figure 113: VM and VP Variable Pitch Sheaves
LVP Variable Pitch Sheaves
Mounting:
1
For single-groove sheaves, slide the sheave onto the
motor shaft so that the side of the sheave with setscrew
A
is next to the motor (see
Figure 5, page 101
).
For two-groove sheaves, slide the sheave onto the motor
shaft so that the side of the sheave with setscrew
A
is
away from the motor (see
Figure 5, page 101
).
2
To remove the flange and locking rings:
a
Loosen setscrews
D
.
b
Loosen
but do not remove
capscrews
E
.
c
Remove key
F
. This key projects a small amount to
provide a grip for removing.
d
Rotate the flange counterclockwise until it disengages
the threads on the shaft barrel.
3
Be sure 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 get to capscrews
E
.
4
Insert key
C
between the sheave and the shaft and
tighten setscrew
A
securely.
T w o G r o o v e
C
A
B
B
D
E
C
A
D
E
D
C
S i n g l e G r o o v e
K e y " E " p r o j e c t s
t o p r o v i d e a g r i p
f o r r e m o v a l .
D o n o t o p e r a t e
s h e e v e s w i t h f l a n g e
p r o j e c t i n g b e y o n d
t h e h u b e n d .
Содержание RAH 047C
Страница 70: ...70 McQuay IM 987 Wiring Diagrams Figure 78 VAV Control Inputs Schematic continues on next page ...
Страница 71: ...McQuay IM 987 71 Wiring Diagrams Figure 79 VAV Control Inputs Continued Schematic continues on previous page ...
Страница 74: ...74 McQuay IM 987 Wiring Diagrams Figure 82 VFD Control SAF and RAF Schematic continues on next page ...
Страница 104: ...104 McQuay IM 987 Final Control Settings Figure 117 Keypad Accessible Menu Structure ...
Страница 105: ...McQuay IM 987 105 Final Control Settings Figure 118 Keypad Accessible Menu Structure Continued ...
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