Simplex STS DAY TANK, Manual

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Overflow-
Return Tank,
Option 383
When the Mode Selector switch is in the Manual position all
floatswitches, except the high fuel level floatswitch are over-
ridden, and either position (Alternate or Both) may be selected.
The pumps will continue to run until Switch #1 is returned to the
Off or Auto position or if a high fuel condition occurs.
For standard duplex operation, the Du-plex switch should be in
the Alternate position and Mode Selector switch should be in the
Auto position. Pump #1 will then start at 50% level and stop at the
90% level. The next time fuel drops back to the 50% level Pump #2
will start and then stop at the 90% level. Continuing operation
alternates between Pump #1 and Pump #2.
When the fuel drops to the 25% level, both pumps will run
simultaneously until the fuel level returns to the 90% fuel level.
Operation: The control switch
should normally be in the Auto
position
and the Power
Available L.E.D. should be
illuminated. The level controller
is set to pump the tank to
virtually empty. There-fore, normally the tank is empty and the
Tank Empty L.E.D. is illuminated. If the adjacent Day Tank should
overfill and overflow, oil will flow from the overflow line of the
Day Tank to the inlet port of the overflow-return tank. Above
empty level, float switch FS3 will close. At 20% level in the
overflow-return tank, float switch FS2 will close, activating the
overflow-return pump which is installed on the tank. The Pump
Start L.E.D. will illuminate and the tank will be pumped-down to
empty. At empty level, float switch FS3 will open and stop the
pump. If the level in the overflow-return tank should continue to
rise above the pump start level, float switch FS1 will close at the
30% level activating the “high fuel level” alarm indicator and
remote signal contacts.
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