12
4 DAY TANK OPERATION
e control nameplate
consists of a durable,
fuel oil resistant, Lexan
membrane which contains
the Day Tank control
pushbutton, switch and
status indicators. e
control panel contains a
Fill Test pushbutton (hold
to test L.E.D. lamps), a
three position Day Tank
Auto-O-Manual switch,
and the following L.E.D.
lamps: Power Available,
Tank Filling, Tank Leak, Not In Auto (blinking),
High Level Alarm, Tank Full, Normal Operating
Range, Fill Start, and Low Level Alarm. Day Tank
operation is represented by the diagram in the lower
center of the nameplate.
e Day Tank control circuitry contains the fol-
lowing serviceable components: motor starting
contactor, and control fuses. Control fuses are 2A,
250VAC, ABC type, and the standard motor starting
contactor is a double pole, 24VDC coil, rated at 20A.
e prime controller in the Day Tank is the printed
circuit board. e Day Tank printed circuit board
is powered by a fused internal 24VDC, 2A, power
supply. e printed circuit board utilizes 24VDC
components to analyze the fuel level data it receives
from the four Day Tank fuel level sensors. e four
fuel level sensors together with the sensor mount-
ing plate comprise the fuel level sensor assembly.
When 120VAC, single phase, 60Hz control power is
supplied to the Day Tank control system the Power
Available L.E.D. is illuminated. See Parts Legend
Drawing for specic components used.
During automatic operation, the printed circuit
board energizes and de-energizes control relays,
the motor starter contactor, and the pump/motor to
automatically rell the Day Tank as fuel is consumed
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