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Spirovents

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hot_rod
hot_rod Member Posts: 22,201
in THE MAIN WALL
I believe the purpose of the male thread on the Spiro-Vent is to cap it for air tests. -DF


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Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream

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  • Donny_2
    Donny_2 Member Posts: 1
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    Spirovents

    I just installed a spirovent in a hot water system that was having air problems. The system had a closed expansion tank without a diaphram. Should I have piped the air vent to return the the air to the bottom of the tank. There is no mention of this in the spirovent literature, but there are male threads at the air vent. Thanks
  • Mark Hunt
    Mark Hunt Member Posts: 4,909
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    No. (NM)



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  • Tom M.
    Tom M. Member Posts: 237
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    Compatible?

    I don't like to have any automatic vents in a system with a non-diaphragm tank. I've never experimented but I would think that you will absorb the air from the tank and remove it with the spirovent in a short period of time. It's possible that the original piping is not directing air from the system to the tank or a leak is causing make-up water to bring new air into the system.

    I thought that that's why the spirovent is threaded there although you wouldn't want to pipe it to the bottom of the tank. Maybe a "dip tube" could be piped to near the top.

    Does anybody know what the purpose of those male threads is?
  • Tom M.
    Tom M. Member Posts: 237
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    Thank You.

    It's one of those things you wonder about but never think to ask about.
  • hot_rod
    hot_rod Member Posts: 22,201
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    another trick

    is to screw a pex X fip adapter on the threaded nosepiece and run a piece of pex to a more convient spot.

    Very helpful when the spiro is within spitting distance of the boiler and electronic controls. Thgey have been known to leak or spray when you turn your back on them :)

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Mark Hunt
    Mark Hunt Member Posts: 4,909
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    Ye olde spirovent trick

    I used to have a problem with the spirovent discharging water whenever I screwed the expansion tank into the bottom of it. I started installing a 1 1/4" by 1/2 blk tee before the spirovent and bringing the feed valve and expansion tank into that opening (point of no pressure change). I have never had it discharge water ever since using that piping arrangement. As far as using a plain steel expansion tank in conjunction with a spirovent? Don't. Do yourself and your customer a favor and use a diapragm style tank.
  • ML
    ML Member Posts: 7
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    Another question. I don't see a directional arrow on the spirovent. Is there an upstream/downstream to it?

    Thanks
    Mike
  • Alan(CaliforniaRadiant)Forbes
    Alan(CaliforniaRadiant)Forbes Member Posts: 1,243
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    It doesn't matter

    on a Spirovent; it's just a big open cavity on the inside.

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  • hot_rod
    hot_rod Member Posts: 22,201
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    Just make sure

    The threaded nosepiece is at the top. And keep it plumb too :)

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ML
    ML Member Posts: 7
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    Thanks for the quick answer

    Mike
  • zeb_3
    zeb_3 Member Posts: 104
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    Why

    does the sticker always peel off?
  • Paul Pollets
    Paul Pollets Member Posts: 3,656
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    Direction

    The Spirovent should point forward, towards the flow.

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  • Danny Paul
    Danny Paul Member Posts: 4
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    spirovent

    There is no real direction for the spirovent. If you look inside their isn't a baffle or flow pattern. That is why their isn't an arrow on the outside.
  • [Deleted User]
    [Deleted User] Posts: 0
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    spirovent

    I work on a commercioal refrigeration system with a sirovent on the suction side of pumps in a closed loop system which cools compresser heads .as compressers cycle off solenoids close for each one and when enough go off pump suctiuon goes in a vacuum and the spirovent (or microbubble resorber?)allows air to be sucked into system.this then is expeled when pump suction comes up as compressers come back online .this takes glycol out of system over time .should spirovent be on pump outlet side only? Thanks Mike
  • zeb_3
    zeb_3 Member Posts: 104
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    I always

    install spirovents at "The Point of No Pressure Change" (expansion tank). If there is no e-tank I'd go on the discharge side of the pump.
  • BILL R
    BILL R Member Posts: 1
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    SPIROVENT

    ONE OF THE REASONS FOR THE THREADED VENT IS TO PIPE INTO TOP OF COMPRESSION TANK SO YOU ALWAYS REPLACE THE AIR. OTHERWISE YOU WOULD FLOOD THE TANK. EITHER DIRECTION FOR FLOW IS GOOD. THE BOTTOM TAP ON SPROVENT IS ALWAYS FOR DIAPAGRAM TANK. EX. EXTROL 15 OR 30. I FIND THAT REMOVING ALL OTHER VENTS FROM MAIN AS WELL AS OTHER AREAS WHEN USING A SPIROVENT HELPS ELIMINATE ALL AIR PROBLEMS. HAVE FILLED SYSTEMS FROM SCRATCH AND NEVER HAD TO BLEED. ALSO LOOK AT THE B& G EASB. IT IS AS GOOD AS A SPIROVENT HAS LARGE CHAMBER AND SCREENS TO CAPTURE THE MICROBUBBLES.
    BILL
  • jim f
    jim f Member Posts: 182
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    spirovent

    hesr a 2" in the field
  • rob
    rob Member Posts: 64
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    That is

    beauuuutiful. Very nice. It's so nice to see an artisan with passion for his craft. My compliments to the chef.
    Some day I'll find an employers who can appreciate this type of craftmanship.
  • Glenn Harrison
    Glenn Harrison Member Posts: 405
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    Bill, call me crazy, but...

    if you hook a steel compression tank up to the threaded top tap on a spirovent, at the point that the spirovent has expelled it's air and the float has closed the top port, now you have isolated the expansion tank from the system and there is no place for expansion to go. And if you look at the literature that comes with a spirovent, you will see that they only show using a bladder tank off the bottom tap.

    p.s. please turn off your caps lock. Thanks
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