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  1. #1
    Join Date
    Oct 2012
    Location
    CT
    Posts
    59

    Replace Schrader Valve or Entire Air Vent?

    Hey Everyone,

    For those that don't know me, I'm new to the HVAC-R field, fresh out of Tech School, still looking for employment. In the mean time I'm picking up work from friends who know I've recently graduated from school. This evening I went to a house where they were complaining of a leaking boiler. First thought was expansion tank, but when I actually looked at the boiler I noticed the leak was coming from the Taco Air Vent. I unscrewed the cap to the air vent and I could see the the Schrader Valve gasket was deformed. It looked like it was pulled out a little. My question for those of you that know a lot more then me is should I just replace the Schrader Valve or just replace the whole Taco air vent? I would think just the valve, but I wanted to see if I was correct first.

    Thanks for any help you can provide!

  2. #2
    Join Date
    Jan 2005
    Location
    New Hampshire
    Posts
    419
    Hi Joe, it is not actually a schrader valve that is in the can. There is a scoop in the water stream that collects the air. When enough air has been collected, the float releases the air through the top. You could try to "rap" the can on the sides with a heavy wrench to see if you can dislodge a possible stuck float. If not you will need to replace the high vent, which means isolating and draining the system. Caleffi has a high vent that has a check valve with it. By putting the check valve in, if it ever leaks again, you can just unscrew the vent and replace without having to drain the system down.

  3. #3
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,340
    You don't need to drain the system. It's 1/8" threads. Just bring the loop pressure down to 0psi and swap it on the fly.

  4. #4
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Or just screw the cap down tight, if there is no air in the system it would be fine until they acualy have to drain it for some reason then replace it

  5. #5
    Join Date
    Oct 2012
    Location
    CT
    Posts
    59
    Okay, that makes a little more sense. I was trying to understand how a schrader valve would work with a air vent since a schrader valve is meant to keep air in, lol. But there is some type of valve on top. When I pushed the pin, more water came shooting out. And I'm certain the gasket around the valve is shot since I can see half a loop sticking out of it. I'll just go to the local supply house tomorrow and pick up a whole vent. We did a lot of work with hydronic in class, switching out all types of things so I'm pretty good with isolation the zones and bleeding only part of the system, lol. I would add a check valve but this air vent is actually in the casing of the boiler, and it would be a lot more work to get in there to add the valve then it would just to drain a little water from it.

    Thanks for the help!



    Quote Originally Posted by dynamic098 View Post
    Hi Joe, it is not actually a schrader valve that is in the can. There is a scoop in the water stream that collects the air. When enough air has been collected, the float releases the air through the top. You could try to "rap" the can on the sides with a heavy wrench to see if you can dislodge a possible stuck float. If not you will need to replace the high vent, which means isolating and draining the system. Caleffi has a high vent that has a check valve with it. By putting the check valve in, if it ever leaks again, you can just unscrew the vent and replace without having to drain the system down.

  6. #6
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,565
    Quote Originally Posted by ascj View Post
    You don't need to drain the system. It's 1/8" threads. Just bring the loop pressure down to 0psi and swap it on the fly.
    Real men just do it on the fly with the system at full pressure.

  7. #7
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Quote Originally Posted by craig1 View Post
    Real men just do it on the fly with the system at full pressure.
    I usually bump it up to 29 psi and 200 degree water myself!

  8. #8
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,196
    They are kidding
    ...

  9. #9
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Quote Originally Posted by kangaroogod View Post
    They are kidding
    Whoops forgot what were dealing with here lol

  10. #10
    Join Date
    Oct 2012
    Location
    CT
    Posts
    59
    I tried to do it without draining the loop as suggested but black water started spraying all over their brand new white carpet. I'm not sure what I did wrong. I did as you guys suggested, lol

  11. #11
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Quote Originally Posted by Joe7cri View Post
    I tried to do it without draining the loop as suggested but black water started spraying all over their brand new white carpet. I'm not sure what I did wrong. I did as you guys suggested, lol
    You have to let the pressure off but not totally drain it

  12. #12
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,317
    Quote Originally Posted by craig1 View Post
    Real men just do it on the fly with the system at full pressure.
    with an 1/8 thread that wouldn't be hard. I did that on a radiator in a huge building. Coin valve though, not auto bleeder.

    Semi-finished space, basically threw drops on the ground and made a tent out of drop clothes.

    Worked out pretty good actually.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  13. #13
    Join Date
    Jan 2013
    Posts
    20
    To swap a Hy Vent and change it on the fly expect some leakage. I would protect the space if it is finished but this is a major time saver.

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