Place the Duplex Pump Mode Switch in the Alternate position.
When the call to transfer fuel contacts close, Pump #1 will start
and run until the call to transfer fuel contacts are opened.
When the call to transfer fuel contacts close again Pump #2
will start and run until the call to transfer fuel contacts are
opened. Repeated operation will continue to alternate the
pumps.
Place the Duplex Pump Selector Switch in the Both position.
When the call to transfer fuel contacts close both pumps will
start and run until the call to transfer fuel contacts are opened.
No lead/lag alternation occurs in the both mode.
If fuel is detected in the catch basin, the floatswitch will close,
activating the fuel line leak alarm illuminating the leak
indicator.
Note: A fuel line leak disables the fill pumps in the Auto mode.
An adjustable time delay relay is wired in parallel with the motor
starter circuit through a normally closed fl ow switch. The time delay
relay, set to 30 seconds by Simplex, allows the pump time to
establish positive flow and prevent false alarms. If the pump does
not develop sufficient fl ow before the time delay relay picks up, or if
flow is lost during operation, the lag pump will be signaled to start
in duplex systems, the failed pump will be stopped and the pump
fail indicator will light. Alarm contacts rated 10A @ 125/250VAC,
10A @ 30VDC.
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