Major Components; Piping - Sears CRAFTSMAN 390.251482 Owner's Manual

Pressure Switch
The pressure switch provides automatic control.
MODEL NO. PUMP STARTS AT PUMP STOPS AT
390.251482
390.251882
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
volume control is needed with Captive Air
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.
Motor
Pump Model Horsepower
390.251482 1/2
390.251882 3/4
MAJOR COMPONENTS / PIPING
40 PSI 60 PSI
40 PSI 60 PSI
® and Standard. No air
® Tanks.
RECOMMENDED FUSING AND WIRING DATA
Max. Load
Volts Amperes
115/230 8.8/4.4
115/230 12.2/6.1
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"
Up to 25 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"
Up to 25 ft.
Well Seal
Well Seal
1-1/4"
Plastic Pipe
Plastic Pipe
Coupling
Coupling
Plastic Pipe
Plastic Pipe
5' To 10'
Pumping Level
Foot Valve
Foot Valve
and Strainer
and Strainer
611 1293
Dug or Cased Well
DUG OR CASED WELL
FIGURE 1
FIGURE 2
183 0893
Distance in Feet From Motor to Meter
Branch 0 to
Delayed Fuse 50
Rating Amps
15/15 14/14
15/15 12/14
4
1-1/2"
25 to 50 ft. 50 to 200 ft.
1-1/4" 1-1/2"
25 to 100 ft. 100 to 600 ft.
Plastic
Pipe
Steel drive pipe
1-1/4"
DRIVEN POINT
FIGURE 3
51 to 101 to
100 200
Wire Size
14/14 12/14
12/14 10/14
2"
Check
Valve
Check valve
NOTE: Check
valve used if hori-
zontal piping is 25
ft. or more.
Steel
Drive
Pipe
Drive
Drive coupling
Coupling
Well point
Well Point
Driven point
201 to
300
10/14
8/14