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Maintenance
DANGER
Always disconnect, lock and tag power source before
servicing. Failure to disconnect power source can
result in fire, shock or serious injury.
WARNING
This unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
DANGER
Pour écarter les risques d'incendie, de choc électrique
ou de blessure grave, veiller à toujours débrancher,
verrouiller et étiqueter la source de courant avant
l'installation ou l'entretien.
AVERTISSEMENT
L'appareil doit être rendu non opérationnel lors du
nettoyage de la turbine ou du caisson (fusibles retirés,
sectionneur verrouillé).
Installation and maintenance are to be performed only
by qualified personnel who are familiar with local codes
and regulations and who are experienced with this type
of equipment.
Motor
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should be
limited to exterior surfaces only. Removing dust buildup
on motor housing ensures proper motor cooling.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
should be greased in accordance with manufacturers'
recommendations. As a general rule where motor
temperatures do not exceed 104ºF (40ºC), the grease
should be replaced after 2,000 hours of running time.
Wheel
Wheels require very little attention when moving clean
air. Occasionally, oil and dust may accumulate causing
imbalance. When this occurs the wheel and housing
should be cleaned to ensure smooth and safe operation.
IMPORTANT: Uneven cleaning of the wheel will
produce an out of balance condition that will
cause vibration in the fan.
®
Tapered Bushing Hub
For wheel hubs utilizing a tapered bushing interface,
follow this procedure for installation and removal.
Bushing Removal
1. If present, loosen the setscrew holding the bushing
and shaft key in place.
2. Loosen and remove the socket head cap screws
which fasten the bushing to the hub as shown in
Figure 3.
3. Take the socket head cap screws that were removed
and install them into the visibly threaded holes on the
wheel hub.
4. Once socket head cap screws are installed, tighten
them an eighth of a turn at a time, alternating until
the bushing comes loose.
Bushing Installation
Figure 3
1. Clean all surfaces of hub and bushing to remove any
oil or residue present and do not use any lubricant to
install bushing into the hub.
2. Slide the bushing and shaft key onto the fan shaft
followed by the wheel and hub assembly. If present,
use the keyway setscrew to hold the shaft key and
bushing in place but DO NOT overtighten as this can
damage the bushing. Align the unthreaded holes
of the hub with the threaded holes of the tapered
bushing.
3. The socket head cap screws are adjustable from the
inlet of the fan. Install the bushing socket head cap
screws into the aligned holes by hand (or without
excessive torque).
4. Adjust the axial location of the wheel in the fan
relative to the inlet cone (venturi) as shown in
Figure 1, page 9. Then tighten the socket head cap
screws an eighth turn at a time in an alternating
fashion and to a torque of 10 ft∙lbs for QT bushings
and 9 ft∙lbs for SD bushings.
NOTE: QT or SD is labeled on the outer edge of the
bushing. QT bushings have two cap screws and SD
bushings have three cap screws.
Rooftop Supply Mixed Flow Fans
Cap Screws
9
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