Which air vent for glycol system??

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to be concerned with in addition to the glycol%.

Try the Caleffi solar catalog. Their Discal Solar Separator is listed for 50% glycol and -22 to 390F temperature.

Are you sure you need 50% glycol? Depends on the brand I know but...

hot rod

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Paul B_5

Which automatic air vent is best suited to the 50/50 glycol mix in my solar system,Should I install a spirovent or replace the cheaper ones on occasion??? Paul

ALH_4

Caleffi Solar

I will second Hot Rod's recommendation. Caleffi's solar products are very well designed.

Paul B_5

Yes, probably to about minus 25 deg f. below zero max..

Metro Man

They all leak

Which ever air vent you use....... depending on temp ratings...... valve it off of system. They all eventually will ooze and leak a little fluid. Since this is a closed loop system you cannot afford to loose any fluid. Makes changing and cleaning easy also.

Typically what we do is after charging system (act. slightly over-charge) run system with air vent iso valve open then close after a couple of days. You get all the air out and then can isolate. Cal. air vents look good for temp ratings. Only time will tell how they hold up after years of use.

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I agree with shut off features

most separators have caps that tighten down for a positive seal.

I like the air purgers the Euro modules use. A very simple chamber that you burp once or twice and shut off. That should be all that is requires in a small capacity system.

hot rod

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