Apply control power to unit. If equipped, place the Main
Disconnect Switch in the “On” position.
AUTOMATIC
Place the Pump Selector Switch in the Auto position. When the call
for fuel contacts close, the pump will start and run until the call for
fuel contacts are opened.
MANUAL
Place the Pump Selector Switch in the Manual Mode. The pump
motor will run until the switch is returned to the “Off” or “Auto”
mode positions or when the Overload Relay trips
Duplex pump units are used to increase the reliability of a pumping
system through the addition of a second, backup pump and level
control. In a duplex system, one pump is designated the “lead”
pump and the other is the “lag” pump. The lead pump
automatically refills the tank over the tank’s normal operating
range of 50% to full. Normally, once the tank has been initially
filled, the fuel level should never drop below 50%. Less than 50% is
indicative of either a failure of the lead pump or consumption in
excess of pump capacity. The lag pump and its separate level
controller, acting as a backup senses a drop in fuel level below 50%
and starts the lag pump, which then continues to run, along with
the lead pump, until the tank is full. To begin operation, apply
control power to unit and place the Main Disconnect Switch in the
“On” position.
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