On 8/13/2018 10:54 PM, Arlen Holder wrote:
On 13 Aug 2018 18:25:12 GMT, Dean Hoffman wrote:

70 psi is probably the shutdown point. 50 psi will probably be the
pump starting point.

Thanks for mentioning that the 70 psi is the shutdown point.
I'm guessing it's measuring that right off the bladder, even though the
gauge is on the pump itself.


Given that the gauge generally reads the same all the time, that 70 psi
"might" also be the pressure of the column of water in the full tanks (I'd
have to do the F=P/A math) where the tanks are ten feet high a few feet
behind the motor).

It's static pressure of the system at the point; there will be a check
valve down the well so it doesn't run back down when pump is off..

One thing I need to look at is whether the pressure gauge shows a lower
pressure when the home has no water pressure. I "think" it always shows the
same pressure - so that's why I think it might be showing the pressure of
the water column BEFORE it gets to the pump (I'd have to check in the
morning as I had not thought about it until now).

It's quite possible it always reads the same pressure because it's
frozen up...and/or the orifice in the base is plugged.

The thing you're calling the relay is the pressure switch.
Notice the tube leading away from it.

Ah. That tube. I didn't notice it until you mentioned it!
http://www.bild.me/bild.php?file=5845028pressure08.jpg

Hmmmm... so the pressure coming out of the bladder is NOT being sensed.
I don't see *any* wires or sense tubes coming out of the bladder tank!
http://www.bild.me/bild.php?file=5816454pressure03.jpg

That is interesting. If I bypass that, the pump should go on and off
(depending on if it's normally open or normally closed).

For it to be a pressure switch, it needs a 'sensor' somewhere.
Maybe the sensor is under those contacts?

The "sensor" is just a calibrated spring; you can adjust the on/off
pressure within reason by the turn screw.

....