18
Normally the Day Tank operates automatically to
control the fuel level between the 50% and normal
full level, which is set at the position of the overow
or vent tting on the tank. An overll can occur if
the control switch is le in the Manual position, if
there is a leak in a control valve permitting gravity or
siphon ow of oil into the tank,
or if there is a control failure.
In the event of an overll, oat
switch FS4 will close, activating
the High Level Alarm L.E.D.
lamp on the control panel. In
addition, the ll pump will be
disabled. e tank should not
ll above this point, which is
approximately 1.0” above the
normal full level but 1.0-2.0”
below the top of the tank. With
the addition of option 390, the
overow-return pump will be
activated by the overow alarm
circuit and will operate as de-
scribed below.
Above 70% level, oat switch
closes and arms the overow-re-
turn controller, illuminating the
“overow return armed” indicator and enabling the
overow pump test pushbutton. Upon activation of
the overow alarm by oat switch FS4, as described
above, the over ow pump contactor will be ener-
gized, and the overow pump will run. e contac-
tor is latched-in via 70% level oat switch and the
tank will be pumped down to the 70% level. is is
intermediate in the normal operating range of 50% to
full and the tank should remain at this level; the rell
pump will not start until the tank reaches the 50%
level. As the overow pump is running, the “pump
running” L.E.D. will be illuminated.
To test the overow-return pump, press the Test
pushbutton. is pushbutton is armed only above
the 70% level, when the L.E.D. is illuminated. e
overow pump will pump-down the tank to the 70%
level. If desired, the tank can be relled to normal full
by pressing the test pushbutton on the control panel.
overflow -
return pump anD
Controller aDDeD
to tHe Day tank,
optIon 390
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