Well pump pressure sswitches

[Robert Bradford Jr.]

TL: I have two Square D pressure switches controlling my submersible well pump. They are wired in series. Switch #1 (FSG2- M4 20/40) and switch #2FSG2 30on/50 off) have worked well for 15-18 years.
Problem: Now when starting pump with switch #1, pressure goes immediately to 58 psi, SW #1 opens and pressure drops rapidly to 32 after pump shuts off and then switch #2 closes and #1 closes and cycle repeats. This occurs at 2 scond intervals with pump starting and stopping. Everything worked for years until last week. HELP. Garden is drying up.

Thanks,
bobby

 

[Valveman]

Don't know why you would have 2 switches. Just turn up the M4 switch to 30/50, and it will still give you low pressure cut out. Then you don't need the second switch. The fact that it is going quickly to 58 PSI, makes me think your tank is water logged.

 

[Sponsor]

 

[Robert Bradford Jr.]

valveman:
Thanks for prompt reply. System was imstalled by father-in-law since deceased. I do not have water pressure tank in system. Any other ideas. I sort of thought two switches was redundant but I am not a plumber of any sort. If I bypass a switch it would NOT be the FSG2. (Just keep the FSG2-M4???)

Thanks again. Great Service.

Bobby

 

[Valveman]

You should not have a pressure switch without a pressure tank. Don't know how it worked for that long. Apparently you are not using as much water as before. You have to use enough water to keep the pump from being able to build to 50 PSI, or it shuts off. If you add a pressure tank, the pump will still cycle on and off, it will just be slower.

Without a pressure tank, I would do away with the pressure switches and just turn on the pump manually, or use a pump start relay from the sprinkler controller.