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INSTALLATION
NOTICE:
Use Teflon tape suppfied
with the pump or Plasto-
Joint
Stikl
for.making
all pipe-thread
connections
to the
pump
itself. To avoid stress-cracking,
do not use pipe joint
compounds
on the pump.
1. Wrap male pipe threads
being attached
to pump with one
or two layers of Teflon
tape. Cover entire
threaded por-
tion of pipe.
2. Do not overtighten
threaded fittings in the plastic pump.
Be sure you do not try to tighten
joint past thread stop in
pump
port!
3. If leaks occur,
remove
fittings,
clean off old tape, rewrap
with one to two layers
of tape and remake
the connec-
tion. If joint still leaks, replace
the fittings (fittings
may be
undersized).
4. -Be sure to support
all piping
connected
to the System.
MAJOR
COMPONENTS
AND
WHAT
THEY
DO
Tank and Air Volume Control
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, and it maintains a cushion
of air under pressure.
When Captive Air* Tanks are used, no air volume control is
necessary. This tank contains a permanent pre.charge of air.
When a Standard Tank is used, an air volume control adds
air_to, the_tank when it is needed. See instructions
included
with Air Volume Control for details on installation and op-
eration.
Pressure
Switch
The pressure
switch
provides
for automatic
operation.
MODEL NO.
PUMP STARTS AT
PUMP STOPS AT
390.251182
30 Pounds
50 Pounds
390.251982
40 Pounds
60 Pounds
390.252282
40 Pounds
60 Pounds
Impeller,
Jet and Pressure
Regulator
The impeller
of the pump
rotates
with the motor shaft, cans-
ing the water
to fly out from its rim by centrifugal
force. The
rotation
of the
impeller
creates
a vacuum
which
_pulls"
in
more water.
Part of the
water
is diverted
back
to the jet
where
it again passes
through
the nozzle
and venturi
- cre-
ating additional
vacuum
to draw in more water
and deliver-
ing it at high pressure
to the impeller.
In a deep
well
installation,
the jet assembly
is submerged
in the well because
the vertical
distance
to the water
level
exceeds
the suction
lift of the pump.
Adjustment
of the
pressure
regulator
causes
the
right
amount
of water
to be diverted
back to the jet for the most
efficient
operation.
'lake Chemical Co., Chicago, Illin°is
In a shallow
well
installation,
the jet assembly
is attached
directly
to the pump
because
the vacuum
created
will pull
water
to the pump.
The pressure
regulator
may be used to restrict
the flow of
water
in a shallow
well system
if the SEARS convertible
pump
produces
more water
than the well can produce.
DEEP
WELL
PUMP
INSTALLATION
(Figures
I & 2, Page 4)
In a deep well installation,
the jet assembly
is submerged
in
the well because
the vertical
distance
to the water
level ex-
ceeds the suction
lift of the pump.
A single pipe system must
be used in 2" and 3 _ wells. A double
pipe system
must
be
used in 4 _ or larger wells.
Follow instructions
packed
with jet package
for proper
noz-
zle and venturi
combination
for your pumping
depth.
DOUBLE
PIPE JET
when
a double
pipe jet is selected,
2 pipes
are used in the
well. One is the suction
pipe,
and the other,
the pressure
pipe.
Plastic pipe is ideal for double
pipe installations,
due
to its light weight
and easy installation.
Use 100
pound flexible plastic pipe
on horizontal
jet
pumps.
TO
INSTALL
4" DOUBLE
PIPE JET
First, inspect
jet to make sure no foreign
matter
has entered
the openings.
Be certain
no foreign
matter
enters
pipe openings
while in-
stalling
the unit.
Plastic
Pipe
Installations
1. Attach
a foot valve (not furnished)
to the jet with a short
nipple.
2. Before installing,
be certain
foot valve operates
freely.
3. A special
plastic
pipe
adapter
is included
with
the jet
which
screws
into the 1-1/4 _ suction
tapping
over the
venturi.
4. Assemble
a plastic
pipe adapter
(not furnished)
into
1 _
tapping
in
the jet body.
5. Use sufficient
length of plastic pipe to place the jet 10-15
feet below
the lowest
drawdown
water level. This is the
level to which
the water in the well will drop while being
pumped
continuously.
6. Tighten all hose clamps securely.
A sanitary well seal is re-
quired on top of the well casing. Use steel nipples
and el-
bows or specialized
galvanized
steel elbows to go through
the well seat. Use plastic pipe adapters where
special el-
bows are not used.
6
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