pressure switch?

[smitty7]

I just replaced the old water tank on our deep well and the pressure would cycle real quick several times and wouldn 't pump anymore. I could hold the contacts in and it would pump, so i replaced the old switch with a new, old one I had just for this kind of situation and it pumps water with a nearby valve opened all the way, but if I crack the valve it goes into the same rapid cycle as the old one, like it's on-off ,on-off, on-off. Do I need another switch?

Thanks For Any Help
Smitty

[billie_boy]

your new tank...has a bladder or not.....you should (unless it is precharged) before you start the pump...pressure your new tank with air to 2 lbs. less pressure than what your "cut in" pressure is...it sounds like your tank is "waterlogged"

[waterdoc]

Most tanks nowdays are shipped over-pressurized so you can just let out enough air to make your pre-charge correct. A very over pressurized tank will act like a waterlogged one. I just ran into one of these on a service call today.
Waterdoc

[smitty7]

I replaced the switch with a brand new one and it pumps for a minute and shuts off and there is no water in the tank. So I'm going to let some of the air out of the tank and if i let too much I can always put some more in. I should have checked the tank to start with anyway thanks for all of you alls help.

thanks
Smitty

[smitty7]

Can one of you fellows tell me the correct way to set the air pressure on the tank? Yesterday I got my pump and tank where it will pump water in the tank by opening a valve and closing it when the pump came on and then when the pump shut off I would bleed some air off. Anyway this can't be the correct way. THanks for all of your help, you guys are great.

Thanks again
Smitty

[Pumpman]

Turn the pump off, open a nearby faucet and completely drain the tank. Use a tire gauge and check the air pressure in the tank. It should read 2 psi less than the pump cutin pressure. In other words, if the pump cuts in a 20 psi, there should be 10 psi air in the tank.
Ron

[smitty7]

Thank you sir, I appreicate your help.

Thanks
Smitty

[Pumpman]

Smitty,
That should have read: If the pump cuts in at 20 psi, there should be 18 psi precharge in the tank. Sorry about that.....
Ron