15
pump/motor does not energize a low fuel level alarm
will be initiated when Day Tank fuel capacity reaches
the 25% level. e low fuel alarm relay LFR energizes,
the Low Level Alarm L.E.D. is illuminated, and LFR
dry contacts close. e Day Tank user may utilize
these contacts to sound an alarm horn or provide an
input to a remote annunciator. Contacts are 5A @
30VDC, 5A @ 125VAC maximum.
For manual (continuous run) operation, the Day
Tank operator must place the Day Tank mode se-
lector toggle switch in the Manual position. Manual
operation allows the Day Tank operator to energize
and run continuously the pump/motor independent
of fuel level sensors FS1-FS3. During manual opera-
tion the control panel L.E.D. lamps will continue to
annunciate fuel level to the Day Tank operator. e
Day Tank will continue to ll until 95% capacity is
reached at which time the High Level mode will be
initiated. e Day Tank pump/motor will be de-en-
ergized and locked out until Day Tank fuel level is
reduced to 90% capacity and fuel level sensor FS3
changes state. Until the alarm condition is corrected
and the control circuitry is reset to Auto the Day
Tank pump/motor will continue to cycle between the
90% and 95% levels. Upon return to Auto, the control
circuitry is reset and the pump/motor will resume
normal operation and cycle between 50% and 90%.
e momentary Fill Test pushbutton is also used to
test L.E.D. lamps on the control board. To use this
feature, press and hold the Fill Test pushbutton to il-
luminate the L.E.D. lamps. If desired, the lamps may
be tested without lling the tank further by placing
the mode switch in the “O” position before pressing
the Fill Test pushbutton.
Duplex pump options are used to increase the reli-
ability of a day tank system through the addition of a
second, back-up pump and level control. In a duplex
system, one pump is designated the “lead” pump and
the other is the “lag” pump. e lead pump automat-
ically rells the day tank over the tank’s normal op-
erating range of 50% to full. Normally, once the tank
has been initially lled, the fuel level should never
drop below 50%. Less than 50% is indicative of either
a failure of the lead pump or consumption in
manual
operatIon
lamp teSt
automatIC Duplex
pump Controller,
optIon 345
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