Inground wells

I have acquired a job looking after two deep wells that are shared in our mobile home community. We have two separate pump houses. They contain in ground pumps, 220v, two regulators (summer-winter), relay contactors, main power on off switch. Three pre pressured water tanks. Water turn off.
I know that the regulators should be approx 20 psi between on and off. I know that the pre charge should be 2 psi less that the on psi.
What I don't know is which spring adjuster in the regulator is for high or low cutoffs. Why we have a winter and summer regulator? How are both wells set to
share each others demand?
Any help will be appreciated...Tks

Two wells/pumps can be set up to alternately pump to meet demand of the pressure tanks, and to operate both pumps when one can't meet the demand. There is usually a device called an alternating relay. Sometimes, that alternating process is done manually by someone flipping a switch at specified intervals.

The first thing you should try to learn is what the control system is supposed to do. I don't mean the electrical logic; I mean the "sit down and write it out on a piece of paper" logic.

Until you understand that logic, you will never be able to understand how the system is supposed to work.

When you speak of regulators, I believe you are talking about pressure switches. If one is for summer and one is for winter, then there is probably a switch that selects the one to control. You should determine what the pressure settings are.

If the "Start" settings are different between summer and winter, then presumably the precharge pressure in the tanks might be changed, but not necessarily.

It is not possible for us to answer why there is a winter and summer regulator (switch). Someone applied some logic to make that decision. Until you understand the logic, and preferable write it out so others can understand it, you will have difficulty maintaining the system.

http://www.goulds.com/pdf/GSSINGLE.pdf

Go to page 31 of the manual (page 35 of the pdf file) at the link.

The large central screw increases (clockwise) both cut-in (start) and cut-out (stop) pressure without changing the differential. The smaller differential screw increases (clockwise) the cut-out pressure without changing the cut-in pressure.

Thanks Bob for the quick post back. Looks like I need to get in touch with the installer and understand the "logic" as you stated. So I will go and do my home work and get back to the forum as soon as possible. I can answer that the winter/summer pressure switch is a manual up down switch which is changed at that time. During the summer months there is of course more demand. So thanks so far with the heads up.