RO Pressure switch
- Thread starter gatorbait
- Start date
Money Pit is correct. When the ASO valve turns off the input to the membrane, no waste water should come out after a few seconds.
Check to see if the way the ASO valve is connected correctly. It controls the path between the prefilter (carbon, sediment, etc.) by sensing the pressure on the membrane's output side. Most are designed to shut off when the membrane has pressure of 20+ psi.
Check to see if the way the ASO valve is connected correctly. It controls the path between the prefilter (carbon, sediment, etc.) by sensing the pressure on the membrane's output side. Most are designed to shut off when the membrane has pressure of 20+ psi.
Yep... The shutoff switch (ie. float valve) will stop the product water, but you need the pressure solenoid to cause the valve before the membrane to close so that no waste water is produced. Otherwise, you are just pushing water through the system and down the drain.
The shut-of valve is a pressue operated solenoid valve. There are two independant paths through the valve.
The first is to where the input water comes in. This is then connected to the RO unit. The output of the RO goes through the second port on the valve. Once the pressure of the water going through the second port gets high enough it trips the solenoid and turns off the input water. This pressure only gets high enough once the ouput tap in turned-off and the storeage tank (if you use one) is full.
Several things can cause problems.
1. You need to have a non-return valve after the RO membrane but before the ouput line runs back through the solenoid valve. Without this the pressure in the output line drops after the water supply is turned off. This happens because the water in the output line migrates back through the RO mebrane and goes down the drain. The symptoms of this problem are that the unit cycles on and off every few seconds.
2. You need to have a flow restrictor on the water water line. Without this, if you're unlucky, the pressure will never build up in the output line going through the solenoid valve to the level needed to turn off the input water.
3. you may have the water path through the solenoid valve reversed.
There are probably other possibilities too
The first is to where the input water comes in. This is then connected to the RO unit. The output of the RO goes through the second port on the valve. Once the pressure of the water going through the second port gets high enough it trips the solenoid and turns off the input water. This pressure only gets high enough once the ouput tap in turned-off and the storeage tank (if you use one) is full.
Several things can cause problems.
1. You need to have a non-return valve after the RO membrane but before the ouput line runs back through the solenoid valve. Without this the pressure in the output line drops after the water supply is turned off. This happens because the water in the output line migrates back through the RO mebrane and goes down the drain. The symptoms of this problem are that the unit cycles on and off every few seconds.
2. You need to have a flow restrictor on the water water line. Without this, if you're unlucky, the pressure will never build up in the output line going through the solenoid valve to the level needed to turn off the input water.
3. you may have the water path through the solenoid valve reversed.
There are probably other possibilities too
Sponsor Reefs
We're a FREE website, and we exist because of hobbyists like YOU who help us run this community.
Click here to sponsor $10:
