FloAire USI-FA - Manual (Page 3)

9.WARNING! Operation in the wrong direction will
deliver air but will overload the motor and could
seriously damage the motor.
10.OUTDOORS When installed outdoors, units should
be provided with Weather Covers available as an
optional accessory from the Company. Outlet
dampers attached to the fan discharge should be
normally closed when the fan is not running.
11.CAUTION! Inlet guards (available from the company
as optional equipment) must be installed whenever
the fan is installed without ducts attached to the fan
inlet.
12.CAUTION! Guards must be installed when fan is
within reach of personnel or within seven (7) feet
(2.134m) of working level or when deemed advisable
for safety.
13.IMPELLER - INLET VENTURI ADJUSTMENT
Adjustment can be achieved through the use of the
slotted holes provided in the fan construction.
For vertical movement, adjust the bearing base
support up or down on the side plates of the motor
and drive compartment. After any adjustment, the
bearing base should be checked to assure its being
level.
For horizontal movement the lower half of the duplex
split pillow bearing housing is slotted for sideways
adjustment. By loosening either set of these bolts,
the impeller can be moved to provide running
clearance between it and the inlet venturi. Be sure to
re-tighten all bolts after proper clearances are
obtained.
MAINTENANCE
1.Under normal usage, no spare parts are
recommended for one year of operation.
Recommended spare parts are shown on page 4.
2.CAUTION! Before proceeding, make sure the
electrical service to the fan is locked in “OFF”
position.
WINDMILLING: Even when the power supply is
locked out, fans may cause injury or damage if the
impeller is subject “windmilling” which is the turning
of the impeller and drive components due to a draft
in the system. To guard against this hazard, the
impeller should be secured to physically restrict
rotational movement.
3.REGULAR MAINTENANCE Determined by the
condition of the air passing through the fans,
regularly scheduled inspection of all fan parts
establishes a good maintenance routine. When the
air is clean, maintenance can be as infrequent as
once a year. When air is contaminated,
maintenance may be required as often as once a
month. Regular maintenance should include
inspection and cleaning of all fan parts.
4. Check belt tension after first 48 hours of operation
and thereafter annually. Belt should depress its
width when pressed firmly inward at midway point
between the pulleys. Too much tension will damage
bearings. Belt should be tight enough to prevent
slippage. When replacing worn belt, replace motor
pulley if “shoulder” is worn in groove. For 2 belt
drives, be sure to replace both belts with a matched
set. Do not adjust belts too tightly as this will cause
undue wear on the bearings of both fan and motor.
Motor pulleys should be inspected regularly and
replaced if they show evidence of excessive wear or
“grooving”.
WARNING! Do not operate at speeds higher than
that cataloged for this equipment. Do not replace
motor pulley with a larger diameter pulley. Do not
replace the fan pulley with one smaller in diameter.
The pulley ratios are set so that the motor will not be
overloaded.
5. Impeller shaft bearings on units with duplex split
pillow block housing are prelubricated and do not
require relubrication. Units with pillow block bearings
have grease fittings and, under normal operation will
need no relubrication for 3 to 5 years. If relubrication
is required, use a grease conforming to NLGI No. 2.
CAUTION! Lubricating bearings with a high pressure
gun can blow bearing seals and overfill the bearing
with grease. This condition can result in excessive
churning and over heating. For normal operating
conditions it is standard practice to fill only 30% of
the bearing void with grease. Do not over lubricate.
NOTE: If locking collar type bearing is used, collar
must first be positioned against inner race on bearing
nearest impeller and turned in direction of impeller
rotation with drift pin and hammer until it locks.
Locking collars must be on inboard (facing) sides of
the bearings. Secure bearing to shaft with set screw.
Lock and secure other bearing to shaft in same
manner.
NOTE: If pillow block type bearings are used, slide
bearings onto the shaft to desired location and bolt
bearing block securely to support base. Slide shaft
back and forth in secured bearing (do not drive with
hammer) and rotate to make certain it turns freely.
Check correct position of impeller with inlet orifice.
Then secure bearings to shaft by tightening set
screws.
6. Motor bearings are prelubricated. Consult
information printed on the motor for lubrication
instructions.
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