Sears 390.2508 - Manual (Page 4)

PIPING INSTALLATION
Cased
Well
Open
Water
Suction Pipe
Foot
Valve
Strainer
Screen
1836 0695
Figure 3
Horizontal Piping From Well To Pump
When the pump is offset more than 25 feet from the well,
horizontal piping should be increased in size to reduce fiic-
tion losses. In no case should the offset piping be smaller
than the suction tapping of the pump.
Horizontal Offset Piping Sizes for Shallow Well Jets
1-1/4” 1-1/2” 2”
Up to 25 Ft. 25 to 50 Ft. 50 to 200 Ft.
Discharge Pipe Sizes
When the pump is set at a distance from the house or point
of water use, the discharge pipe size should be increased to
reduce pressure losses caused by friction.
If horizontal suction pipe is more than 25’ long, install a
priming plug at weU head to allow filling of pipe.
SEARS jet pumps should be used with Captive Air® Tanks
(see Figure 2, Page 3). For mounting pump to tank, pur­
chase tank fittings Kit No. 2788.
SEARS Captive Air® Tanks are pre-charged with air at the fac­
tory. Check the tank Owner’s Manual to find if air charge
needs adjustment. Pump model 390.2508 requires 30
pounds for proper operation.
The Jet pump can also be mounted on standard horizontal
tanks. A mounting kit with an AVC is furnished with tank
(Figure 1, Page 3). Instmction are also included.
The installation, operation and care of your Hydroglass®
pump is very similar to cast iron pumps. We ask, however,
that you keep the following points in mind.
IMPORTANT; Use teflon tape supplied with the pump
for making all threaded connections to the pump it­
self. Do not use pipe joint compounds on the pump!
1. Wrap one and one-half to two layers of Teflon tape on all
male threads being attached to pump. This will insure
leakproof connections. Do not overtighten threaded fit­
tings in the plastic pump. If leaks do occur, remove the
fitting, clean off the old Teflon tape, rewiap with one
and one-half to two layers of new tape and remake the
connection.
2. Be sure to support all piping connected to your Shallow
Well Jet Pump.
3. To connect AVC to the pump, remove the 1/8" pipe plug
(Key No. 13, Page 11) from the jet portion of the pump
body near the suction tapping. Insert a 1/8" fitting into
this tapping. Cut tubing to length and assemble the two
fittings on the air volume control and pump body.
1” 1-1/4” 1-1/2”
Up to 25 Ft. 25 to 100 Ft. 100 to 600 Ft.