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Before Start-up
Before start-up, the following should be verified.
1 Fasteners - All foundation bolts, wheel hub setscrews, wheel locking bolts,
and bearing locking collars must be tight.
2 Bearings - Check the bearings and make certain they are properly lubricated.
3 Fan Wheel - Turn over the rotating assembly by hand to insure that it runs
free and does not bind or strike the fan housing. If the wheel strikes the
housing, the wheel may have to be moved on the shaft.
4 Motor - Check the electrical wiring to the motor. The current characteristics
of the supply line must agree with the motor nameplate rating. The motor
should be wired and fused in accordance with the National Electric Code
(NEC) and local codes.
5 Ducts - Duct connections from the fan to the duct work must not be distort-
ed. Ducts should never be supported by the fan. All duct joints should be
sealed to prevent air leaks. All debris should be removed from the ductwork
and the fan.
6 Resistance Check - Check the resistance leg to leg and leg to ground to make
sure that the starter is wired correctly. The three legs should have equal resist-
ance +/- 5%. The resistance to ground should be 20 megohms or higher.
AD-4 l
Addendum
IMPORTANT: Always refer to the
wiring diagrams that came with
your blower before checking electri-
cal connections.