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GENERAL
INFORMATION
Table h Pump Performance
Chart (In Gallons Per Minute)
Discharge
Pump
Suction
Discharge
Pressure
Pumping Depth in Feet
Model
Description
Size
Size
P.S.I.
5'
10'
15'
20'
390.2508
1/2 HP Standard S.W. Jet
1-1/4"
3/4"
40
7.3
6.2
5.2
4.2
MAJOR COMPONENTS
AND
WHAT
THEY DO
Relief
Valve
ie Tee
Water System
and Priming Plug
Built-in
Check
Valve
23140E96
Figure
I
Impeller
and Jet
Impeller turns with motor shaft, causing the water to fly out
from its rim by centrifugal force. Impeller rotation creates a
vacuum which puUs in more water. Part of the water is di-
verted back to the jet where it passes through the nozzle and
venturi. This creates more vacuum to draw in more water.
In shallow
wells
(less than 20 feet deep),
the vacuum
cre-
ated
at the pump
is enough
to pull water
to the pump.
Therefore,
for shallow
well use the jet is built into the pump.
Air Volume Control
The air volume control (AVC) maintains the cushion of air
in Standard tanks.
Pressure
Switch
The pressure
switch
provides
automatic
control.
MODEL NO.
PUMP STARTS AT [PUMP STOPS AT
390.2508
_
/
_
Check Valve or Foot Valve
This pump
is equipped
with a built-in
check
valve. Install a
foot valve in the well on dug or cased
wells. See Figure 3,
Page 4.
Tank
The tank serves
two functions.
It provides
a reservoir
of
water,
some of which
can be drawn
through
the house
fix-
ture before
the pump
must
start. It maintains
a cushion
of
air under
pressure.
Two types of tanks are available:
Captive
Air® and Standard.
No air vohtme
control
is needed
with
Captive®
Air Tanks.
PIPING
Piping
in the Well
A Shallow
well jet pump
can be installed
on a dug well,
drilled well or with
a driven
point.
In a dug or ased well, a
foot valve and strainer
should
be installed
for easy priming.
It should
be five to ten feet below
the lowest
level to which
the water
will
drop
while
pump
is operating
(pumping
water
level).
The strainer
should
not be too close to the bottom
or sedi-
ment may clog it. Before
installing
the foot valve,
check
to
see that it works
freely.
When
installed
on a driven
pont
well, your
Shallow
Well
Jet Pump should
have a check
valve installed
as shown
in
Figure 2.
To Household
Discharge
Tee
Water System
f-
and Priming Plug
II _--Relief
Valve
Drive
Point
Couplin9
Not
Orive
to
Point
Scale
Figure 2
For a pump at sea level, be sure the vertical distance (lift)
from the pumping
water level to the pump is not over 20
feet if the pump is over the well. This wll be less if the pump
is offset from the well.
The maximum
lift of any pump
decreases
at the rate of about
1' less lifx for every 1,000 feet elevation
above
sea level. For
example,
if your
are at 5,000
feet
elevation
such
as in
Denver,
Colorado,
you would
loose five feet of llfx. The max-
imum
depth
from
which
oyou
could
pump
water
would
therefore
be 15 feet.
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