Gasboy 552A Series - Manual (Page 14)

GASBOY 552A/553A Commercial Pumps
3-2 03/07/03
CIRCUIT BREAKERS
Power to the unit must be supplied from a dedicated 20 to 30 amp breaker. No other equipment
should be powered from this breaker. A tag on the motor identifies the maximum current draw of
the motor. If two units are supplied from one breaker, that breaker must be capable of handling
the load of both motors.
PUMP MOTOR
Pumps are shipped from the factory with motors wired according to the specifications given on the
order as to kind of 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 change-over 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. 380 VAC pumps are permanently set and cannot be changed.
Many motor failures result from improper setting of the motor change-over plate. If set for 120
VAC and a 240 VAC feed is used, the motor will burn out after running only a short time. If set for
240 VAC and a 120 VAC feed is used, the motor will run very slowly and the starting field will soon
burn out.
WIRING AND CONDUIT
Pump Wiring
The table below shows the required AC wire size based on the HP rating of the pump motor and
the distance from the circuit breaker to the pump for both 115 and 230 volt units. Use this table as
a guide for selecting the proper size wire for your installation. Consult local wiring requirements
for wiring of 380 VAC motors.
If multiple units are powered from the same breaker through the same wires, you must increase
the gauge of the wires to handle the added load according to the distance from the breaker panel
and the HP rating (if applicable).
Wire Size