Individual Fan Wheel Adjustment; Fan Belts; Fan Rotation; Fan Pulley Alignment - Bryant 524J Series Installation, Start-Up And Service Instructions Manual

Fan
Pulley(s)
Belts
Motor
Pulley(s)
Mounting
Bolts

Individual Fan Wheel Adjustment

Loosen the 2 locking bolts holding the fan wheel hub to shaft.
(See Fig. 21.) 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. The correct
deflection is 1/8 in. (3.2 mm). (See Fig. 23.)
If complete belt replacement is required during servicing, loos-
en the motor plate mounting bolts (Fig. 23), move motor/plate
assembly towards fan pulley, and pull belt(s) off pulleys. Re-
verse the procedure with new bolts and readjust deflection.

Fan Rotation

Correct fan rotation with respect to fan outlet is shown in
Fig. 24.
Air
Discharge
Cutoff
Plate
Fan
Wheel
Fig. 24 — Fan Rotation
Fig. 23 — Fan Motor Mounting
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 a single-phase motor.

Fan Pulley Alignment

Align as follows:
1. Loosen setscrews on pulleys.
2. Align pulleys visually and tighten setscrews on fan pulley to
lock it in place.
3. Use the methods shown in Fig. 25 to check proper pulley
alignment.
Pulleys
Fan
Housing
23
Adjustable Flanges
Straight Edge Must
Be Parallel
With Belt
Setscrews
Fixed Flanges
Single Groove
Motor and Fan Shafts
Must Be Parallel
Fig. 25 — Fan Pulley Adjustments
Slot
Setscrews
Two Grooves