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Pump
Model
390.250097
TABLE
I - Pump Performance
(In Gallons per Minute)
NOTE:
This system is designed for pumping depths of 20 feet or less.
Discharge
Pumping Depth in Feet
Description
Suct.
Disch.
Pressure PSi
5'
10'
15'
20'
1/2 HP S.W. Jet
1-1/4"
3/4"
40
7.3
6.2
5.2
4.2
BASIC
TOOLS
AND
MATERIALS
NEEDED
Plastic Pipe Installation
Tools
Pipe Wrenches
Screwdriver
Knife or Saw to Cut Plastic Pipe
Tire Pressure Gauge
Materials
Plastic Pipe and Fittings (as required
to complete
lob).
Teflon Tape (DO NOT use joint compound
on plastic fittings).
Galvanized
Steel Pipe InstaUation
Tools
Pipe Wrenches
Screwdriver
Pipe Cutting
and Threading
Tools
Tire Pressure Gauge
Materials
Galvanized
Pipe and Fittings (as required to complete
job).
Pipe Joint Compound
or Teflon Tape
MAJOR COMPONENTS
AND WHAT
THEY DO
Impeller
and Jet
Impeller
turns with
motor shaft, causing
water
to fly out from its
rim by centrifugal
force. Impeller rotation creates
a vacuum
which
pulls in more water.
Part of the water
is diverted
back to the jet
where
it passes through the nozzle and venturi.
This cremes more
vacuum
to draw in more water.
In shallow wells (less than 20 feet deep),
the vacuum created
at the
pump is enough
to pull water to the pump. Therefore,
for shallow
well use the jet is built into the pump.
Pre-Charged
Tank
The tank serves
two functions.
It provides
a reservoir
of water
under pressure
and maintains
a cushion
of air pressure
to prevent
pipe hammering
and possible
damage
to plumbing
components.
When water is drawn
off through the house
fixtures,
the pressure
in the tank is lowered
and the pump starts.
Pressure Switch
The pressure
switch provides for automatic
operation.
Pump starts
when
pressure
drops
to 30 pounds
and stops
when
pressure
reaches
50 pounds.
Check Valve or Foot Valve
This pump is equipped
with a built-in check
valve. Install a check
valve as close
to well as possible
on well p_mt
installations.
A
foot valve must he installed
in the well on dug or cased wells. See
Figures 2A and 2B (Page 4). For long horizontal
pipe runs, install
check valve as close to well as possible
(all types of wells).
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