Cut in pressure question?

[Jfharper]

Just replaced a pressure switch and pressure tank (I have two pressure tanks) and set the switch to 40/60 and the tanks to 38psi each with tanks empty. When I turned everything back on and after first fill up, I watched the pressure drop (after a number of minutes) slowly to 42 then the pressure would jump to 38 and the booster pump would kick on. Is this normal? I was wondering if either my water pressure or air gauge is off. Is the water pressure not supposed to make this sudden drop before switching the booster pump on?

 

[Reach4]

For whatever reason, you need to reduce the precharge pressure. It could be partly a difference in gauge calibration and partly due to your booster pump needing more time to build up pressure once the pressure switch closes. I would drop your precharge by 2 PSI.

 

[Sponsor]

 

[Jfharper]

Thanks.