KevinB Posted January 25, 2013 Share Posted January 25, 2013 I've been having trouble with my ATO system and have finally decided to address it. My Auto shut off valve (ASOV) is installed between my RO membrane and DI cartridge, which is where BRS recommends installing it. I've got a check valve in there as well. When I first installed it, you could hear the ASOV whoosh on and off as needed in normal operation, and any time the ATO kicked in there was a little bit of extra pressure at first then it would go to its normal state of a fast dribble of water. Then the ASOV started making a kind of stammering whoosh sound, and got quite a bit louder. The functionality was the same, but it seemed to be having problems. Then it seemed my ASOV failed completely because it no longer made ANY noise, and there was a much greater amount of pressure building up in the line if the outlet was closed off. At one point one of my cartridge filter housings cracked, I assume from the pressure. From then until now I've been shutting off the water supply to the RO system when not in use to prevent pressure build up. I replaced my ASOV and the new one is doing the exact same thing, no sounds, lots of pressure build up. Now I'm wondering what I should look at next...if the check valve has failed would that be the culprit? What else might it be? Another general question...should there be any air in the DI filter housing? Since putting my most recent DI resin cartridge there has been a layer of air between the cartridge and the housing wall. I just tonight got around to removing the air, but I'm worried it might somehow return, I don't really know how it got there to begin with. There are currently no water leaks anywhere. Thanks! Quote Link to comment Share on other sites More sharing options...
+brian.srock Posted January 25, 2013 Share Posted January 25, 2013 Sorry misread ATO for RO. No clue there. Quote Link to comment Share on other sites More sharing options...
victoly Posted January 25, 2013 Share Posted January 25, 2013 My DI filter housing is completely full. Are you positive that you have the inlets/outlets "wired" in the correct fashion? Is the water pressure in your house exceptionally high? Quote Link to comment Share on other sites More sharing options...
victoly Posted January 25, 2013 Share Posted January 25, 2013 Also, it may not be a bad idea to swap the check valve for a new one, just to see if that's the problem. They're not super expensive, and it's probably not a bad idea to have one hanging around anyway. 1 Quote Link to comment Share on other sites More sharing options...
KevinB Posted January 25, 2013 Author Share Posted January 25, 2013 I've triple checked the aspv inlet outlet plumbing, so I don't think that's it, but I guess it wouldn't hurt to swap the high and low pressure sides for a test Quote Link to comment Share on other sites More sharing options...
HoneysReef Posted January 29, 2013 Share Posted January 29, 2013 I am not sure what type of ASO you have but if it is a float valve type, they recommend that you don't keep pressure to it all the time. The guy at spectra pure told me that it messes up the membrane and that ASO are typically so that you can fill up a reservoir and not worry about it overflowing but should turn it off until the reservoir needs to be filled again. In my case, I was going through DI cartridges like crazy and couldn't figure it out and it turned out to be because I left the water supply on. Hope it helps. Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted March 12, 2013 Share Posted March 12, 2013 If the ASOV is working - meaning that it is stopping the flow of waste water when the flow of purified water is stopped, then your check valve is working. When the ASOV's stop working, it is typically one of 3 things: 1. Float valve leaking 2. Check valve leaking 3. Bad ASOV The ASOV's "compare" the pressure in the high pressure side of the system to the prssure on the low pressure side of the system. When the low pressure side reaches about 66% of the high pressure side, the ASOV cuts off the high pressure side and stops frow to the RO membrane. The ASOV doesn't add pressure in any way. Regarding your DI housing - you just have some air trapped in there. With the system running, unscrew the housing a quarter turn and you'll be able to burp the air out of the housing and you'll see the water level start to rise. Just as the water leavel reaches the black oring, cinch the housing tight. Russ Quote Link to comment Share on other sites More sharing options...
Buckeye Field Supply Posted March 12, 2013 Share Posted March 12, 2013 Here's a diagram you can use to check the routing of your tubing: Russ Quote Link to comment Share on other sites More sharing options...
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