Adjusting Belt Tension - Trane IntelliPak SCWF 20 Installation, Operation And Maintenance Manual

Table 48. Fan hub and sheave torques
Unit size Fan
Diameter
SCWF 20
SCWF 22 18"
SCWF 25
SCWF 29
SCWF 32
18"
SCRF 25
SCRF 30
SCWF 35
SCWF 38
20"
SCRF 30
SCRF 35
SCWF 42
SCWF 46
SCWF 52
25
SCWF 58
SCRF 40
SCRF 50
SCWF 65
SCWF 72
SCWF 80
SCRF 60 27
SCWF 90
SCWF C0
SCWF C1

Adjusting Belt Tension

N N O O T T I I C C E E
B B e e l l t t T T e e n n s s i i o o n n ! !
D D o o n n o o t t o o v v e e r r - - t t e e n n s s i i o o n n b b e e l l t t s s a a s s i i t t c c o o u u l l d d r r e e d d u u c c e e f f a a n n
a a n n d d m m o o t t o o r r b b e e a a r r i i n n g g l l i i f f e e , , a a c c c c e e l l e e r r a a t t e e b b e e l l t t w w e e a a r r a a n n d d
p p o o s s s s i i b b l l y y c c a a u u s s e e s s h h a a f f t t f f a a i i l l u u r r e e . .
SCXF-SVX01Q-EN
Set Screw Torque (ft-
Size
lbs)
5/16" 12
5/16" 12
5/16"
14
3/8"
24
3/8"
24
Figure 42. Belt tension gauge (top) and fan belt
adjustment (bottom)
To adjust belt tension see
the following procedure:
1. Loosen bolts A, B, and E on both sides of the sliding
motor base. See Figure 43, p.
2. Loosen nuts C and D (as required for motor
horsepower) to slide the motor on its mounting
plate in the proper direction to tension or relieve
tension on the belt.
3. Adjust nuts A-D and bolt E. Do not stretch the belts
over the sheaves.
4. Retighten all nuts and bolts.
5. Verify tension is adjusted properly.
Recommended belt tension range values are on the
unit fan scroll. To access the fan scroll, face the right-
hand side of the unit and remove the top left panel. The
belt tension label is on the top right-hand corner of the
fan scroll. See Figure 43, p. 90
The correct operation tension for a V-belt drive is the
lowest tension at which the belt will not slip under the
peak load conditions. It may be necessary to increase
the tension of some drives to reduce flopping or
excessive startup squealing.
M M a a i i n n t t e e n n a a n n c c e e
Figure 42, p. 89 and perform
90.
89