ATO from RODI - shut off acting up?

Ideally, I would have the solenoid turn the water flow on and off and use the float valve as protection in case the solenoid fails but it is suspended to the level-loc rod and cannot be placed below the float valve (unless you break it off and DIY a holder for it).

 

You shouldn't need to change the positioning of anything I don't think. Just turn the solenoid on every 2-3 hours or whatever is reasonable with a timer, turn it on for say 5 minutes (or you could time how long it takes to replenish the sump and have it run maybe 30-60 seconds longer just in case), it will fill up until the float valve catches the water level and triggers the ASOV then after 5 minutes the solenoid will be turned off by the timer.

It does negate the backup aspect of the solenoid somewhat though but if it's only open for a short time every couple of hours it's not going to be able to flood anything as long as you check on your tank once a day or so. At least if I'm understanding everything right, I don't have a level-loc so someone correct me if I'm wrong.

 

yes, you're absolutely right, I guess I can just add a timer to the solenoid..
the problem now is that the slightest move of the water service opens the float valve and turns the RODI on... putting the solenoid on a timer will let enough water to evaporate so when the RODI is turned back on it will fill the sump back up and then shut off everything.
It doesn't negate the back up aspect of it because it will still shut off the water in case the float valve fails or when the timer turns it off. It does make the float valve somewhat useless but hey, I already have it on there
I just won't have the RODI refill my sump constantly in small amounts but instead in longer intervals and respectively larger amounts of water, which shouldn't affect salinity that much... i hope

 

Yeah exactly. The float valve will be as useless as your solenoid was before.
Actually slightly less useless because it should be the precise control to the water level. Just set the timer to run every couple of hours, if you feel like it's fluctuating too much then have it run more often for shorter periods of time, since your float valve will never let it put too much water in it's pretty foolproof.

You could even test your salinity right before the timer trips just to see how high the salinity is getting, although I doubt it will even be detectable if its just a matter of a couple hours. Actually if it is a really a noticeable change in salinity you probably want to shorten your timer delay on the solenoid.

 

Agreed! Will let you know how it works in a couple of days.
Thanks again to all who replied!