Sears 390.252158 owner manual Basic Tools and Materials Needed, Major Components, What They do

SAFETY INSTRUCTIONS (Continued)

6. Disconnect electrical power source before installing or working on pump.

7.Ground pump with a ground wire run from grounding

lug on motor to a grounded lead in the service panel.

8.Line voltage and frequency of electrical power supply must agree with motor nameplate.

9.Use of fuses or wire smaller than size recommended in

owner's manual can cause overheating, possible fires, and will void warranty.

TABLE I - Pump Performance (In Gallons per Minute)

NOTE: This system is designed for pumping depths of 20 feet or less.

Pump				Discharge	Pumping Depth in Feet
Model	Description	Suct.	Disch.	Pressure PSI	5'	10'	15'	20'
390.252158	112 HP S.W. Jet	1-1/4"	1"	40	8.2	7.3	6.2	5.0

			BASIC TOOLS AND MATERIALS NEEDED
Plastic Pipe			Installation
Tools					Materials
Pipe	Wrenches				Plastic	Pipe	and	Fittings (as required to complete job).
Screwdriver
Knife	or Saw	to Cut	Plastic Pipe		Teflon	Tape	(DO	NOT	use joint compound	on plastic	fittings).
Tire	Pressure	Gauge
Galvanized			Steel	Pipe	Installation
Tools					Materials
Pipe	Wrenches				Galvanized		Pipe	and Fittings (as required		to complete	job).
Screwdriver
Pipe	Cutting	and Threading		Tools	Pipe Joint Compound				or Teflon Tape
Tire	Pressure	Gauge

MAJOR COMPONENTS

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 di- verted back to the jet where it passes through the nozzle and venturi. This creates more vacuum to draw in more water.

In shallow wells (less than 20 feet deep), the vacuum cre-

ated at the pump is_enough to pull water to toe pump.

Therefore, for shallow _-ell 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 pres-

sure 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.

AND WHAT THEY DO

Pressure Switch

The pressure switch provides for automatic operation.

Pump starts when pressnre drops to 40 pounds and stops when pressure reaches 60 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 o_ well point in- stallations. A foot valve must be installed in the well on dug or cased wells. See Figures ZA and 2B, Page 4. For long hor- izontal pipe runs, install check valve as close to well as pos- sible (all types of wells).

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