rodi set up help

[soundgeek]

I am moving into a new house and I want to set up a rodi unit. I was thinking of placing the unit upstairs in the closet with the water heater and feed it from the cold water line. I need help to figure out how I can set it up for auto top off to my tank downstairs. The rodi unit will only be for the tank. Thanks

 

[boxfishpooalot]

are you going to use a float valve?thats what i use works great. But you need 2 of them, one for the bucket to shut off the water, and one for the tank to keep up with evaporation.

 

[soundgeek]

I was going to use a float switch but I didn't know if the float switch can turn on the rodi unit and turn it off. I guess they make an electric valve?

 

[boxfishpooalot]

well I was thinking that the float valve does not shut off the rodi, but instead just slows the flow down.

 

[drummereef]

I wouldn't have a float switch direclty hooked up to the RO/DI. If it fails there will be contiuous flow to your tank. Very bad. I'd have a resevoir with a mechanical float valve and use the electronic float switch fill the tank/sump from the resevoir. The idea is to have a limited amout of top-off available in case of complete failure. Some people use selenoid valves on the RO/DI, but still it would worry me if it failed.

 

[gman19]

I have my RO/DI feeding from the cold water supply of my hot water heater in the garage. It fills 2 storage tanks, one for RO/DI and one that I mix Saltwater in.

I use a float switch and a normally closed solenoid to keep the tanks full.

One could do the same thing using a float switch within the sump to control the solenoid to turn the input on/off to the RO/DI.

The float switch is IMO more reliable than a float valve when trying to avoid floods...which is why mine is set up as it is. I've been running this thing for years now and it has never flooded or failed yet.

 

[boxfishpooalot]

Dont they have pressure rated float valves to stop the ro/di?

 

[dougchambers]

<a href=showthread.php?s=&postid=8200372#post8200372 target=_blank>Originally posted</a> by boxfishpooalot
Dont they have pressure rated float valves to stop the ro/di?

They do. We use the Kent Float for our sump and a Brutte can for fresh water. You need to make sure your RO/DI water maker has an ASOV (Automatic Shut-off Valve) in order to use a float or you will continue to reject water.

Many people don't like hooking a float valve directly to the RO/DI unit because if the float ever fails, you can crash the salinity in your tank. With that said, we've had a float valve in our sump for over a year and never had a problem with it. However, this weekend we will be installing a solenoid valve in-line with the sump float and allow it to cycle twice per day from our AquaController.

The first water made by RO/DI systems isn't very good so having a float trigger multiple times a day puts a higher percentage of low quality water in your system. By only allowing the system to fill twice a day ensures that the RO/DI system runs longer and generates better water. You just need to make sure your solenoid on times are long enough to top-off the tank.

-Doug

 

[boxfishpooalot]

thx, but to clarify we are talking about float valves x2? 1 for the reservior, and 1 going to the tank?

I would never run a float valve directly from the rodi to the tank, that would be disaster.

 

[soundgeek]

I have been moving and just got internet back. What i was planning was rodi upstairs dumping into some reservior with a float switch and then another float in the sump to pump downstairs to the tank. I plumbed the line this weekend. Now i just have to finish the house.