Tension The Fan Belt - Trane Climate Changer TCFS Nstallation, Operation, And Maintenance

Tension the Fan Belt

NOTICE:
Belt Tension!
Do not over-tension belts. Excessive belt tension will
reduce fan and motor bearing life, accelerate belt wear
and possibly cause shaft failure. Under tensioning belts
is the primary cause of premature belt failure. Belts
should not squeal at startup. Recheck belt tension after
8 hours, 24 hours, and 100 hours of operation and
monthly thereafter.
Proper belt tension is required to ensure maximum
bearing and drive component life and is based on motor
horsepower requirement. A label located on the bearing
support on the drive side of the unit lists all drive parts, the
proper belt tension, and deflection for that tension for the
specific drive.
Figure 61. Tension drive belt label
V-BELT DRIVE KIT
PURCHASE ORD. NUMBER B24597-061 H5D073B A
CUSTOMER'S KIT # H5D073B A-012-0400
MTR HP.= 10.0
FAN RPM = 1458 CD = 9.4 AT 3.00 TRN OPN
TENSION INFO - 3.86 LB., 0.14 IN.
DRIVE'S BELTS - B40
MOTOR SHEAVE - 2VP75X 1 3/8
MOTOR BUSHING - NONE REQUIRED
FAN SHEAVE - 2B5V80
FAN BUSHING - B 1 7/16
If the drive is changed from the original, proper belt
tension can be estimated using
The correct operation tension for a V-belt drive is the
lowest tension at which the belts will not slip under the
peak load conditions. It may be necessary, however, to
increase the tension of some drives to reduce excessive
belt flopping or to reduce excessive startup squealing.
Check the fan belt tension at least three times during the
first days of operation because there is a rapid decrease in
tension until the belt settles in. To measure belt tension,
use a belt tensiometer (see
CLCH-SVX010A-EN
1627373
MODULE 0400
Table 2.
Figure 62).
Figure 62. Belt tensioner
Small O-ring
Large O-ring
Determine actual deflection by depressing one belt with
the belt tensiometer and measuring the deflection relative
to the other belts or to belt line (see
belt tension to the correct pounds force and tighten all
bolts to the proper torque. See
Figure 63. Belt tension measurement
Belt span
Deflection =
64
Start-Up
Force scale
Span scale
Figure 63). Adjust the
Table 8, p. 77.
Belt span
55