Pressure Adjustment

Pressure Adjustment
Install a pressure switch and a pressure gauge on your system. Purchase a pressure switch of the type used with conventional AC pumps. You might buy a switch that says "cut-in 30 PSI / cut-out 50 PSI" This indicates the factory settings, but they are adjustable.
The setting determines the pressures at which the pump turns on and off. The cut-out adjustment is also called "differential", since it sets the difference between cut-in and cut-out. It is desirable to use the LOWEST pressure that will satisfy your flow requirements.
The lower you can set the cut-out, the less power your pump will require AND the more water your pressure tank will store. Read the instruction card that comes with the switch. Many homes are plumbed using the minimum required sizes of 1/2 inch and 3/4 inch pipe. In this case, use a 50 PSI cut-out for good flow. If you have not yet plumbed your house, have it done with one size larger than minimum pipe sizing, all around. Your piping will have less resistance to flow, and you can use a lower cut-out pressure.
Try 35 PSI and see how it performs. You can try less. When you are satisfied with the flow you get, then go to the next step.