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RE: Taco Air Vent

jboissy16
jboissy16 Member Posts: 11
When replacing the air vent, do you have to purge the whole system or can you just isolate it where the shut off values are. And also besides opening the vent 1 full turn do I have to do anything else to the system

Comments

  • billtwocase
    billtwocase Member Posts: 2,385
    have you

    done something like this before? 
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    Just need to know if I can just isolate it, so I don't have to purge the whole system
  • billtwocase
    billtwocase Member Posts: 2,385
    yes

    take the pressure off the boiler, isolate it, replace it, and turn the feeder back on. Make sure the pressure ends up 12-15
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    So shut the main off, shut all the values before and after the the air vent, replace and turn on all values? make sure after replace that pressure is 12-15, Nothing else? no purging
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    Just purge that section that I isolated for the air vent? correct 
  • billtwocase
    billtwocase Member Posts: 2,385
    is it

    on top of an air scoop?
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    yes
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    yes
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    So just purge that section that I isolate, replace it, open the values and the main and that ir ?
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    Replaced, now Zone 1 heating acting funny.Supply line for that Zone really hot return line just barely warm. Heat in one room more then others, heating is still coming on in that room when t-stat is down/off??
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    Replaced, now Zone 1 heating acting funny.Supply line for that Zone really hot return line just barely warm. Heat in one room more then others, heating is still coming on in that room when t-stat is down/off??
  • kcopp
    kcopp Member Posts: 3,772
    You may have....

    disturbed some junk in the line. That may have lodged under a flow check valve. This sounds like phantom flow. If you can purge out the line in may get the junk off the seat.
  • jboissy16
    jboissy16 Member Posts: 11
    RE: Taco Air Vent

    So you mean it may be a freaky then, nothing to do with the air vent. So that junk is causing the heat to come on without the tstat on? So to purge that line do I isolate just zone 1 with the shut off and close the shut off right after thats zones circulaor and open the purge value?? anything else
  • billtwocase
    billtwocase Member Posts: 2,385
    2 things

    first is can you post some picks of your system, and second, you never specified why you needed to replace the hivent. Is it leaking, not venting, or are you having a heating or pressure problem that you feel as though replacing this vent will solve?
  • icesailor
    icesailor Member Posts: 7,265
    Air Vents:

    I consider those air vents as an evil, as hateful as a product can be. I screw the caps down tight and leave them so they don't leak all over. And I've never had a system get air bound because of it. Only ones with the caps left loose and open.

    You need to change the vents by "Catching it on the fly". By, putting a washing machine hose on the boiler drain, closing any vent on the system, and opening the drain on the boiler. When the system drops to zero, take new vent, which you have all ready with Teflon tape and paste already applied, and in one hand, unscrew the old vent. As it comes free, carefully insert the new one into the threads. As soon as you get it started a couple of turns, immediately close the drain valve on the boiler. Open the fill valve after you finish tightening the vent. If you do it quickly (and it doesn't need to be all that fast), you shouldn't need to purge the system.

    If, when you are unscrewing the vent, water is squirting out of the threads, you haven't drained enough out. When the water stops squirting, Mother Nature is mad at you and trying to equalize the pressure inside the boiler/system by forcing her way into the system through the threads.  
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