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Which air vent for glycol system??

hr Member Posts: 6,106
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
    Paul B_5 Member Posts: 60

    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
    ALH_4 Member Posts: 1,790
    Caleffi Solar

    I will second Hot Rod's recommendation. Caleffi's solar products are very well designed.
  • Paul B_5
    Paul B_5 Member Posts: 60

    Yes, probably to about minus 25 deg f. below zero max..
  • Metro Man
    Metro Man Member Posts: 220
    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.
  • hr
    hr Member Posts: 6,106
    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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