imacdad
New Member
I have a submersible pump on 220v with a large diaphragm tank on a 30/50 system. I put in the large tank to reduce pump usage. This past weekend I replaced the pressure switch because the old one was sticking open. The new switch works intermittantly. Works fine for a few days and then when the shower is running, will not kick the pump on when the pressure drops down. The new switch has the cut-off feature built in for low pressure. I noticed yesterday that when the shower is on that the pressure drops down slowly until it gets to about 30psi. Then it drops off like a rock. I believe this is what is causing my switch to not work right, but what causes the sudden drop in pressure? Shouldn't it be more gradual to the cut in pressure of 28psi?