Question about Wayne WATER SYSTEMS SWS50-12P 1/2 HP Shallow Well Jet Pump Conventional 12-Gallon Tank System

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Very low water pressure and excessive pump running

Pump struggles to reach 50psi to shut off. Water pressure extremely low til pump kicks on.

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Clean electric switchcontacts with crocus cloth. Adjust higher cut in pressure on this switch.

Posted on Apr 22, 2014

  • Robert Koch Apr 22, 2014

    Clean electric switchcontacts with crocus cloth. Adjust higher cut in pressure on this switch.Be sure power is off.



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How do pressure tanks such as varem work?

Varem pressure tanks are simple pressure vessels. They have a chamber where the fluid comes in and a bladder that is pressurized on the other end that the fluid pushes against and compresses the air or other gas that is inside the bladder. When the pressure on the fluid line reaches the pressure switch setting, the pump shuts off and the gas pushes the water back out of the tank (if it is being used) until the pressure switch lower limit is reached and the pump kicks back on, pushing fluid back into the tank. This cycle continues until the fluid is no longer being allowed out of the system.

The bladder pressure is set when the system is empty of water and is set to a couple of pounds less than the low pressure cut on setting, that keeps the bladder from pushing all the fluid out of the tank before the pump comes back on resulting in a zero pressure moment which with some pump switches means it shuts down and has to be manually restarted.

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Grundfos JPF4A pump. takes a long time to get up to prime then once it kicks in after running water it gets to 50 shuts of but drop pressure instantaneously and kicks back in again. The constant on off...

The check valve is bad. When the system builds up pressure and shuts off the check valve prevents water from dropping back down the well line. When the check valve goes bad water drops back down the well line and siphons water back out of the well tank causing the switch to kick on and off constantly. The check valve will between on the well line coming from the drop pipe. It may be making a constant rattling noise as pump is running. Replace the check valve and you should be fine. Also check the pressure in bladder tank it should be 2psi below the "cut-in" pressure for the switch.

May 22, 2011 | Grundfos Plumbing

1 Answer

My heat-pump went into lockout due to low water pressure. The pressure is back up to 50psi. After shorting between the test pins, the unit starts but the status light still flash about every 10 sec and...

the unit has a hi pressure safty switch on it, probally has a red push button on top. when the water slows down or stops the hi pressure trips to shut unit down to prevent compressor damage, the switch does not reset it self, find it in the outdoor unit and reset it, let me know. thanks wally.

Mar 11, 2011 | Heat Controller Heating & Cooling

1 Answer

I lowered my water pressure on the tank because my water line pressure was 62 psi, and ruptured my water heater. Now my water pump runs almost all the time. How to I set up my tank properly.

pressure switch,look under cover tells you how too set there's low set and high set,look at pressure guage should click on at 30psi shut off at 50psi, adjust to this, just be careful don.t get shocked'power goes to switch for your pump. that would be first thing i'd check.

Jan 24, 2011 | Plumbing

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