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MAJOR COMPONENTS
/ PIPING
Pressure
Switch
The pressure switch provides
automatic control.
MODEL NO.
PUMP STARTS AT
PUMP STOPS AT
390.251483
40 PSI
60 PSI
390.251883
40 PSI
60 PSI
Tank
The tank serves
two functions.
It provides
a reservoir
of water,
some of which
can be drawn
through
the house
fixture
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
volume
control
is needed
with Captive
Air* Tanks.
PIPING
IN THE WELL
A shallow
well jet pump
can be installed
on a dug well, drilled
well
or a driven
point.
SEARS shallow
well jet pumps
have
a built-in
check
valve. In a dug or cased well, a foot valve and strainer
should
be installed
for easy priming.
It should
be 5 to 10 feet below
the
lowest
level to which
the water
will drop while
pump
is operating
(pumping
level) (Figure
1).
The strainer
should
not be too close
to the bottom,
or sediment
may clog.it.
Before installing
foot valve, check
to see that it works
freely.
When using a foot valve, a priming
tee and plug must
be included
(Figure
2).
Be sure the vertical
distance
(lift) from
the priming
level to pump
is not over
20 feet,
if the pump
is over
well. This
will be less if
pump
is offset from
the well.
Both figures
are for sea level.
The
maximum
lift of any pump
decreases
with
the elevation
above
sea
level. This decrease
is at the rate of 1 foot per 1000 feet of eleva-
tion. For example,
the lift is 17 feet and your elevation
is 3000 feet
above sea level. You would
then be pumping
17 plus 3, or 20 feet.
This is still satisfactory
for shallow
well pumping.
EMERGENCY
POWER
In some
areas
and with
some
installations,
an emergency
power
supply
to guard against
power
failure
is a good
idea.
If you install
an engine-generator
set for emergency
backup
power
for your
pump,
supply
the generator
set manufacturer
with
the nameplate
data from the pump
motor.
He will then be able to provide
a gen-
erator
of the correct
size to power
your pump.
Also, be sure to add
the load from any other
accessories
(such
as lights)
that may be on
the same circuit.
Horizontal
Piping
from
Well
to
Pump
On well
point
installations
where
the
horizontal
piping
is more
than
25 feet, a check
valve should
be installed
(Figure
3).
When
the pump
is offset
more
than 25 feet
from
the well,
hori-
zontal
piping
should
be increased
in size to reduce
friction
losses.
Never
use offset
piping
that is smaller
than
the suction
tapping
of
the pump.
Horizontal
Offset
Piping
Sizes
- Shallow
Well
Jets
1-1/4"
t
1-1/2"
t
2"
Up to 25 ft.
25 to 50 ft.
50 to 200 ft.
Discharge
Pipe
Sizes
When the pump
is some distance
from the house
or point
of water
use, the discharge
pipe size should
be increased
to reduce
pressure
losses.
1"
1-1/4"
|
1-1/2"
Up to 25 ft.
25 tolOOft.
T
100 to 600 ft.
Plastic
C_leck
1-1/4"
Well Seal
Pipe
._aValve
NOTE: Check
valve useO _f how
zontal p_ping _s 25
or more
Plastic Pipe
1-1/4"
T
5' TOtO'
Pumping Lovel
Foot Valve
1
DUG OR CASED WELL
Steel
Drive
Pipe
Drive
Coupling
Well Point
DRIVEN POINT
FIGURE
I
FIGURE
3
\
FIGURE
2
Pump Model
390.251483
390.251883
Motor
Horsepower
1/2
RECOMMENDED
FUSING
AND WIRING
DATA
Distance in Feet From Motor to Meter
Volts
115/230
115/230
Max. Load
Amperes
10.5/5.2
Branch
Delayed Fuse
Rating Amps
1_15
Oto
51 to
101 to
201 to
50
100
200
300
Wire Size
14/14
14/14
10/14
8/14
3/4
12.4/6.2
20/15
12/14
12/14
10/14
8/14
4
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