Fan Shaft, Bearings, and Fan Wheel (Typical) Fan Shaft Bearing
Fan Motor Mounting
Individual Fan Wheel Adjustment -
Loosen the 2 locking bolts holding fan wheel hub to shaft. See (Fig. Fan Shaft,
Bearings, and Fan Wheel (Typical). Position fan wheel in center of the fan housing and tighten locking bolts.
Clearance between wheel and housing should be the same on both sides.
Fan Belts -
Motor mounting plate and motor support angles are slotted to permit both vertical and horizontal
adjustment. Adjust belt(s) for correct deflection by loosening motor plate mounting bolts, moving motor/plate assembly
forward or back, and re tightening bolts. Press down on belt with one finger midway between fan and motor pulleys to
check deflection. For units with motor sizes up to and including 3.7 Hp (2.76 kW), correct deflection is 3/16-in. (4.8
mm). For larger motor sizes, correct deflection is 1/8-in. (3.2 mm). See Fig. Fan Motor Mounting. If complete belt
replacement is required during servicing, loosen the motor plate mounting bolts, move motor/plate assembly towards
fan pulley, and pull belt(s) off pulleys. Reverse the procedure with new bolts and readjust deflection.
Fan Rotation -
Correct fan rotation with respect to fan outlet is shown in
Fan Rotation
.
To reverse the direction of
rotation of a 3-phase fan motor, reverse any 2 of the power leads. Refer to the connection diagram on the inside of
motor terminal box cover for proper reversing procedure of single—phase motor.
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