INSTALLATION

1-1/4"1-1/2"2"

Up to 25 Ft.

25 to 50 Ft.

50 to 200 Ft.

Discharge Pipe Sizes

When the pttmp is some distance from the house or point of water use, the discharge pipe size should be increased to reduce pressure losses caused by friction.

1"1-1/4"1-1/2"

Up to 25 Ft.

25 to 1O0 Ft.

1O0 to 600 Ft.

quired on new installations, pumps requiring repriming and

pumps that have been disassembled for service. Do this as follows:

1.Open faucets furthest from tank and allow pump to op- erate.

2.Air in the system will cause a sputtering flow; allow faucets to run until you have a steady, air free stream.

3.Open and close faucets repeatedly until you are sure all air has been removed.

4.If stream does not become steady, air may be leaking into the system; check for leaks in the piping on the suction side of the pump.

NOTICE: To prevent waterlogging, check tank air charge annually.

Tank

Tanks are pre-charged with 40 PSI air pressure at the factory.

Your tank requires an air charge of 40 pounds per square

inch (PSI) for proper operation; check tank pressure with

tire gauge to determine ff air charge needs adjustment. Tank

pre-charge shonld be checked annually; see instructions at

right.

In areas where the temperature is high for long periods of

time, the tank pre-charge pressure may increase. This may

reduce the tank drawdown (amount of water available per

cycle). If this occurs, reduce the pre-charge pressure to two

PSI below the pump cut-in setting of the pressure switch (normally to 38 PSD.

It is necessary to flush all air out of the piping system and

water reservoir portion of the pre-charged tank. This is re-

To Check Tank Air Charge

If drawdown (amount of water available per cycle) de-

creases significantly, check as follows:

1.To check air charge in tank, shut off electric power to pump, open faucet near tank, and drain completely.

2.At the air valve in top of tank, check air pressure with

standard tire gauge. Air pressure should be the same as pump pressure switch cut-insetting (40 PSI).

3.If the air pressure is below 40 PSI, add air to the tank.

Use an air compressor or a portable air storage tank.

4.Use soap or liquid detergent to check for air leaks around

air valve. Continuous bubbling indicates a leak. If neces- sary, install new core in air valve. This is the same as

those used for automobile tubeless tires.

 

 

 

1

 

 

 

 

2

3

 

 

 

 

4

 

 

5

 

1.

Tank

nearly

empty

- air

expands

Filling area

above

 

cut off

setting

of pressure

switch.

 

 

vinyl

separator.

 

 

 

 

 

 

 

4.

Water

being

drawn from

tank

- compressed

tank air

 

 

 

 

 

 

 

 

 

 

 

2.

Water

begins

to

enter

tank

-

air

is compressed

above

 

forces

water

out of

separator.

 

 

 

separator as it fills with water.

 

 

 

5.

Separator

completely

empty

- new cycle

ready to

 

 

 

 

 

 

 

 

 

 

 

3.

Pump-up

cycle

completed

-

air

now compressed

to

 

begin.

 

 

 

 

 

 

 

Figure 3

Page 4 Page 6
Page 5
Image 5
Sears 390.2521 owner manual To Check Tank Air Charge, 41-1/22, Discharge Pipe Sizes, 11-1/41-1/2
Page 4 Page 6

390.2521 specifications

The Sears 390.2521 is a notable addition to the world of household appliances, particularly recognized for its versatility and user-friendly design. This multi-functional device is primarily known as a microwave oven, making it a staple in many kitchens. With its compact build and efficient performance, the 390.2521 caters to various cooking needs, from heating leftovers to preparing entire meals.

One of the main features of the Sears 390.2521 is its powerful microwave generator, which typically operates at a wattage of around 900 watts. This ensures that food heats evenly and efficiently, reducing cooking time and energy consumption. The model's sleek design includes a spacious interior that can accommodate large dishes, making it suitable for family meals or batch cooking.

The 390.2521 comes equipped with a variety of cooking presets, allowing users to quickly select the appropriate settings for different types of food. These presets include options for popcorn, pizza, and beverages, among others. The intuitive control panel is designed for ease of use, featuring soft-touch buttons and a digital display that clearly indicates cooking times and power levels.

In terms of safety features, the Sears 390.2521 includes a child lock function to prevent accidental operation, making it a trustworthy option for families with young children. Additionally, the appliance is fitted with an automatic shut-off system, which activates at the end of the cooking cycle to prevent overheating and ensure safe use.

Technologically, the 390.2521 leverages the latest advancements in microwave technology. Its sleek interior design is easy to clean, thanks to a non-stick coating that resists food buildup. The turntable feature ensures even cooking by rotating food for optimal heat distribution, which is particularly beneficial when reheating or defrosting.

Another noteworthy characteristic of the Sears 390.2521 is its energy efficiency. The appliance is designed to minimize energy consumption, which is an essential consideration for environmentally conscious consumers. Its compact size also makes it easy to fit into various kitchen layouts, offering both functionality and aesthetic appeal.

In conclusion, the Sears 390.2521 microwave oven stands out in the competitive kitchen appliance market due to its combination of power, safety features, and user-centric design. Whether for quick heating, defrosting, or cooking, this model serves as a reliable and stylish option for any modern kitchen, making meal preparation faster and more convenient.
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