Ian,

That Square D pressure switch is really tricky to get adjusted correctly, but when you get it right it, it along with the pump Amel installed is so much better than any on-demand pump on the market anywhere.

There are two adjustments to the Square D switch. The center nut adjustment is for the cut-on pressure...be sure to adjust it first...and to back off of the other nut adjustment about 2 -3 turns before you adjust the center cut-on pressure nut.

When you are satisfied with the cut-on pressure adjustment, adjust the 2nd adjustment nut...this is the duration-on adjustment. For instance, it is too loose if the pump turns on as soon as you turn on water flow and off when you turn off water flow. Screw the nut clockwise to increase the duration...increasing duration pressurizes the accumulator tanks. BTW, the accumulator tank air pressure should be slightly less than your pressurized fresh water system pressure. If the pressurized fresh water system pressure is 40psi, the tank should be 30-34psi. Only check the accumulator tank air pressure with the fresh water system depressurized.

Don't get discouraged if you have to do this several times to get it where you want it...and because the switch is mechanical, it may require adjustment again. The process is fresh in my mind because after being off BeBe for 6 months, I had to go through the process.

I hope this helps.

Bill (Admiral, Texas Navy, Current Governor's Commission...I wish Texas had ships, but they would have to be Amels)
BeBe, SM2k #387
Currently Fethiye, Turkey