Motor Reassembly; 2-Speed Motors - A.O. Smith ST1302 Manual

40
CAUTION: When
routing leads under the
canopy be sure that:
A. No leads are in the
area of the rotating
governor.
B. When the canopy is
installed make sure
leads will not be
pinched between the
canopy and the end
frame.
NOTE: In either case
the fault could cause a
ground, resulting in a
very dangerous condition
should power be applied
without proper ground-
ing.
Level 2

MOTOR REASSEMBLY

Reassemble the motor in reverse of the disas-
sembly procedure.
Observe all reassembly precautions and
adjust the motor start switch.
Recheck wiring.
Check rotor and shaft and make sure it turns
freely by hand.
Check motor for grounds before applying
power.

2-SPEED MOTORS

Two-speed motors are regulated by various
types of controls which range from a simple
"high-low" toggle switch to elaborate and exotic
automatic systems. Thus troubleshooting two-
speed systems requires an extensive knowledge
of both motors and controls.
Two-speed motors are built with and without
high-low switches. The conversion of a "with"
switch motor to "remote" switch operation
requires more than just removing the switch.
Schematic diagrams are included in this section
for conversion purposes.
Capacitor start — Motors of this design have a
model number beginning with C (i.e., C48 or C56)
and usually start on the high speed (2-pole)
winding.
Split phase — a split phase motor (S48) always
starts on high speed. There is no start capacitor,
therefore, the red tracer lead from the start
winding connects directly to terminal #2 on the
switch.
Capacitor start and run — motors of this
design have a model number beginning with K
(i.e., K48 or K56) and will have a run capacitor
mounted on the exterior of the motor.
Thermal protector — 2-speed motors always
have the thermal protector located on the motor
windings.
Pump Motors
A.O.Smith