|
The most common problem relating to pump run time is that the pressure tank is waterlogged. This can happen if it is a bladder tank with a ruptured bladder, or a non-bladder tank without a correctly working snifter valve. Without air in the pressure tank, the pump turns on, the pressure immediately skyrockets, and the pump turns off. Then the pressure immediately drops with usage, and the pump cycles again. Besides creating poor, almost unusable surging water pressure, this two to three second cylcing state of affairs can create further damage in two areas: 1) The pressure switch keeps opening and closing, and the arcing wears out the points 2) The pump overheats due to the constant start up loads. A submersible pump should run for 1 to 2 minutes per start, depending on the horsepower rating. Usually pressure switches that go bad fail in a "stuck open" or "stuck closed" mode. In the stuck open case, the pump never comes on (no water) In the "stuck closed" case, the pump never shuts off -- and the resulting too high pressure blows out something in the system. Beyond that, the pressure switch springs can be adjusted for "cut-in" and "cut-out" pressure. Provided the air charge in the pressure tank is appropriately adjusted, and providing the tank is big enough, and providing the pump is sized correctly, you can adjust the pressure range to whatever you like.
|