ASOV not reliably shutting off

[five.five-six]

My RO/DI system is setup to fill a brute 32. It works great, I always have about 29 gallons of water ready for whatever I do. I put the wast water down the washing machine drain in the laundry room. Well, I hear it running when it shouldn’t be running. If I flick the ASOV it will shut off but then sometimes it will start again. I have recently replaced the ASOV but still having trouble. I have resigned myself to closing the watts valve on the supply line to the RO/DI when I know the bruit is full. Any ideas? I’d rather it just be full automated and reliable.

 

[Discotu]

I hate ASOVs, they hummm and squeal and are unreliable.

Assuming you're not pulling ato water from the brute right? That would cause the float valve to release and start making water again.

When you hear it running when it shouldn't be is it producing rodi water? That would mean you have a leaking float valve but it'd also overflow your brute so you'd know. If it's producing only waste water then you have a bad asov and/or the source water pressure is abnormally high.

Personally I don't trust my rodi to make water on its own (especially if with asov). When i need rodi its deliberate. First I flush the ro memebrane to clear tds creep then i flip the valve to pass through the di stages. Then i have a float/optical switch set to switch off a 120vac solenoid valve on the supply line when the container is full. Even then i still estimate the time to fill and set an alarm to confirm its all off. I've had too many rodi overflows in my lifetime lol

 

[Jimbo327]

Most likely your float valve is not holding seal.

To troubleshoot, I would take the tubing going to the float valve, and just add a shutoff valve on the end of the line. Shut off that valve. If it stops the the leak, then your float valve needs to be replaced.

 

[five.five-six]

Most likely your float valve is not holding seal.

To troubleshoot, I would take the tubing going to the float valve, and just add a shutoff valve on the end of the line. Shut off that valve. If it stops the the leak, then your float valve needs to be replaced.

Well it is 10 years old but if it leaked the bruit would overflow. It’s not leaking.

 

[five.five-six]

I hate ASOVs, they hummm and squeal and are unreliable.

Assuming you're not pulling ato water from the brute right? That would cause the float valve to release and start making water again.

I will never hook an ATO directly to a continuous water supply for a lot of reasons. I run through 10-15 gallons of DI water a week. I like to fill the ATO reservoir when I have time to fill it.

 

[Jimbo327]

If it isn't the float valve, then I would check for trapped air. Pick up and rotate the RO unit in all directions while it is making water...and it may release any air trapped in unit.