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Wiring
Ground
Page 8 MDE-4567D 9820K Series AST Pumps Installation and Operation Manual · January 2020
Ground
To ensure proper operation of the equipment and provide the necessary safety factors, this unit
must be grounded. Refer to
on
.
Circuit Breakers
A separate circuit breaker is required for the motor and another for the rest of the unit. A tag on
the motor identifies the maximum current draw of the motor. If two (2) pumps are supplied
from one breaker, the breaker must be capable of handling the load of both motors. Provisions
must be made to break both legs of any AC circuit.
Note: Canadian regulatory requirements may differ.
Pump Motor
Pumps are shipped from the factory with motors wired according to the specifications given
on the order regarding current, frequency, and voltage.
Very often, on installation, it becomes necessary to change the original setting to suit the AC
power source. To do this, locate the motor changeover plate (typically located on the shaft end
of the motor) and remove the screw which secures it in place. Slide the plate so that the desired
voltage, as marked on the plate, lines up with the screw hole. Reinsert the screw and secure the
plate in place.
Figure 3-1: Changeover Plate
Many motor failures result from improper setting of the motor changeover plate. If set for
115 VAC and a 230 VAC feed is used, the motor will burn out after running only for a short
time. If set for 230 VAC and a 115 VAC feed is used, the motor will run very slowly and the
starting field will soon burn out.