40
Pump Motors
Level 2
A.O.Smith
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.
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.
