WWW.BALTIMOREAIRCOIL.COM
13
13
Detailed Component
Maintenance
Procedures
Fan Drive System
BALTIDRIVE
®
Power Train,
Independent Fan and
BALTIGUARD™ Fan System
Inspection & Maintenance
• Belt tension check:
– Place a straight edge along the belt from sheave to sheave as shown in Figure 4a, or
use a tape measure as shown in Figure 4b, to measure belt deflection.
– Apply a moderate force by hand (approximately 40 lbs/275 kPa) evenly across the
width of the belt in the center of the span between the sheaves.
– There is adequate belt tension if the belt deflects between 1/4” and 3/8” as shown
in Figures 4a and 4b.
• Belt tension adjustment (if required):
– Loosen the lock nut on the motor base adjusting screw.
– Turn the motor base adjusting screw clockwise to tension the belt, or
counterclockwise to relieve belt tension. During adjustment of belt tension, rotate
the drives several times by hand to evenly distribute the tension throughout the belt.
– When the belt is properly tensioned, retighten the locking nut on the motor base
adjusting screw.
• Drive alignment check and adjustment:
– Check the drive alignment annually to ensure maximum belt life.
– Place a straight edge across the driver and the driven sheaves as shown in Figure
NOTICE: Check to ensure the
controls for the fan motor are set
to allow a maximum of six on-off
cycles per hour to prevent motor
overload.
Figure 5a. Standard Drive Alignment
Figure 5b. BALTIGUARD™/BALTIGARD PLUS™ Fan System Drive Alignment
5a for standard drives and in Figure 5b for the
BALTIGUARD™ Fan System or the BALTIGUARD
PLUS™ Fan System.
– The straight edge should contact all four points as
shown in Figure 5a and 5b indicating proper drive
alignment.
– There should be no more than 1/16” deviation from
four points of contact.
– In case of realignment, loosen the motor sheave and
align it with the fan sheave. Allow 1/4” for draw-up
as the bushing screw is retightened.
To Next Page
Loading...
Need help?
General
