FAXA-SVX01B-EN 77
Maintenance
maintenance
procedures
Figure M-MP-6. Fan belt adjustment
Figure M-MP-4. Belt tension gauge
Adjusting Fan Belt Tension
To adjust the fan belt tension, refer to
Figure M-MP-6, following the procedure
below.
1. Loosen bolts on both sides of the
sliding motor base.
2. Loosen nuts (as required for motor
horsepower) to slide the motor on its
mounting plate in the proper direction
to add or relieve belt tension.
3. Adjust nuts and bolt. Do not stretch the
belts over the sheaves.
4. Retighten all nuts and bolts.
5. Verify tension is adjusted properly.
CAUTION
Belt tension!
Do not over-tension belts. Excessive
tension will reduce fan and motor
bearing life, accelerate belt wear, and
possibly cause shaft failure.
Recommended belt tension range values
are on the unit fan scroll. To access the
fan scroll, face the right-hand side of the
deflection = belt span/64
unit and open the supply fan access door.
The belt tension label is on the top right-
hand corner of the fan scroll. The correct
operation tension for a V-belt drive is
thelowest 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.
Figure M-MP-5. Fresh air unit fan plate
WARNING
Rotating components!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing can cause death or serious
injury.
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