16
excess of pump capacity. e 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. Multi-function duplex
pump controller system providing selectable operat-
ing modes, including:
• Automatic lead pump alternating with automatic
lag pump back-up
• Automatic twin pump operation (both pumps run
simultaneously) automatic level control back-up
• Manual operation
Basic System includes the following:
• All controller features
• Manual o Auto Switch (1 per pump)
• Pump running indicators for each pump
• Two pumps, each with check valves
Operation: With the Duplex switch in the Alternate
position, Pump 1 will start at 50% and shut o at the
90% level. For utilization of both Pump 1 and Pump
2 simultaneously, switch to Both positions. In this
position Pump 1 and Pump 2 will start at the 50%
level and shut o at the 90% level.
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