r/o with booster pump?

[coralbeauties]

I have a booster pump installed on my r/o system. I currently have an auto shutoff valve and a pressure switch to shut off the booster pump. My issue right now is the shutoff valve cuts the flow to the membrane but the pressure never builds enough to shut off the booster pump so it continues to run. There are so many different diagrams online, some have auto shut off valves and some dont. I have my output going into a pressure tank and that is where the pressure switch is getting its pressure from. Any advise how I need to plumb this up would be appreciated.
thanks
Jeff

 

[UncommonSense]

I have a booster pump installed on my r/o system. I currently have an auto shutoff valve and a pressure switch to shut off the booster pump. My issue right now is the shutoff valve cuts the flow to the membrane but the pressure never builds enough to shut off the booster pump so it continues to run. There are so many different diagrams online, some have auto shut off valves and some dont. I have my output going into a pressure tank and that is where the pressure switch is getting its pressure from. Any advise how I need to plumb this up would be appreciated.
thanks
Jeff

This sounds like your automatic shutoff switch for the booster pump has a higher switching pressure than your RO system’s ASO valve, assuming the ASO valve is plumbed correctly!

Does your booster pump ASO switch have a single little (probably Allen head) screw accessible from the exterior of the switch itself? — this is typically the switching pressure adjustment for an ASO switch, if it is adjustable!

Edit: have you adjusted the accumulator tank (pressure tank) air bladder’s pressure from factory settings? This can also affect system performance!