Proper Accumulator Tank Pressure
Hi, I have a Shurflo 4008-101-E65 that shows a shut off at 55 psi and a restart at 40 psi. I have a Shurflo 182 accumulator tank, that if I am correct, should be set at 40 psi. That seems rathe...
Forum Discussion
egarant wrote:
I read the manual, I even quoted the one part of the manual that I had a question on....is the RESTART pressure the same as the Turn on Pressure?
That's all.....
There is no such thing as "restart pressure" in water systems.
You have turn on (IE the "lowest" pressure) and turn off (IE the "highest" pressure).
Pump will only "turn on" when the pressure is less or equal to the turn on pressure.
Pump will "turn off" when the pressure reaches the highest pressure and will not turn back on until the pressure falls to or below the turn on pressure.. The pump will not turn on (or "restart" as you put it) until the pressure is equal to or less than the turn on pressure.
So your pressure tank precharge in order to make the system work correctly SHOULD be set no higher than the TURN ON pressure.
The precharge pressure however can be less than the turn on pressure to a certain extent and still work fine. The well driller that I had in to replace my home well pump and pressure tank yrs ago actually sets the precharge 2 PSI below the turn on pressure.. Not sure exactly why, but it works fine, the guy does that for a living so he must have some reasoning for doing it that way.
To be clear, turn on is the lowest pressure.
Pump will not turn on between the turn off and turn on after it has been tripped to off until pressure drops to or below the turn on pressure..
You do not want the precharge to be higher than the turn on, otherwise, why bother with the pressure tank?
Turn off is the highest pressure.
