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 Air eliminator for hydronic heat
Author: NotHandy (Non-US)

Hi..I am having a he** of a time keeping air out of my hot water heating boiler. I bleed it and it runs silently for 2-3 days and then air enters/builds and I have to bleed it again. It has a small vent on top of the boiler that to me seems useless. I have heard of a "spiral vent"....anyone have any thoughts as to getting the air out and KEEPING it out? thanx TJ.

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 Re: Air eliminator for hydronic heat
Author: e-plumber (NY)

You may not have to make any changes to the system.

Have you been bleeding the air out with the circulator(s) turned off?, very important.
Usually when a heating system is properly bled of air, it does not return any time soon unless the piping system or boiler is worked on. The same water in a closed forced water heating system can be used for years.

e-plumber
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"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

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 Re: Air eliminator for hydronic heat
Author: NotHandy (Non-US)

I have the circ. pump off..yes...bleed from where return water enters the boiler from the zones..oppsite side from the water supply. Water supply valve is open (small lever lifted) I get lots of air..just did it 20 minutes ago actually...but the air always ! returns. I get a very very small amount of air from the eliminator on top of the boiler...I am wondering if air could be entering from the expansion tank??

I try and try..the more I do, the behinder I get

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 Re: Air eliminator for hydronic heat
Author: e-plumber (NY)

Normal procedure:

- Shut the circualtor.
- Close all zone valves except the one that you're bleeding air from, manually open it.
- Shut the valve below where you're connecting the hose, open the valve where the hose is connected.
- Let more water pressure into the system, (lift the lever) but don't let it go above 25-27 P.S.I.
- Stick the hose end into a bucket full of water so you can actually see that it's running clear, (with no air bubbles coming from it), it may take several minutes.
- Repeat process with the other zones, one at a time.

If you have a bladder type expansion tank you're not going to get air from it going into the system. A conventional (ceiling mount) type can possibly let air in depending on exactly how and where it's installed. You can always switch to a bladder type pre-charged one if needed.

e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

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 Re: Air eliminator for hydronic heat
Author: NotHandy (Non-US)

Thats exactly how I do it. And it works fine..for 2/3 days..just did it and I can't even hear it running...yet!

I try and try..the more I do, the behinder I get

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 Re: Air eliminator for hydronic heat
Author: Uni R

Do you have a conventional tank?
Air bubbles can go into solution and leave the tank.


Do you have a leak?
Turn your feed off and see if your boiler maintains pressure.

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 Re: Air eliminator for hydronic heat
Author: packy (MA)

spirovent...

[www.spirotherm.com]

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 Re: Air eliminator for hydronic heat
Author: royboy (SC)

I've used Spirovent on my hot water recirculation for years. It also acts as a scrubber for micro air bubbles.

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 Re: Air eliminator for hydronic heat
Author: NotHandy (Non-US)

No leaks UNI R...but thanx for the suggestion.and thanx for the link Packy..going there right now! By the way, the air is back! :{

I try and try..the more I do, the behinder I get

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 Re: Air eliminator for hydronic heat
Author: NotHandy (Non-US)

Allright !! I got my spirovent installed (actually one from Bell&Gossett,same thing only different), and I literally have to touch the circ. pump to know if its working, the system is so quiet...hopefully it will stay that way....one more question on a related note..I see my boiler callf for a minimun 5.7 gal/min glow over the elements. I have a Grundfoss three speed pump. What speed should it be set at? It can be set with just a screwdriver on the side..any thoughts? And..Thanks gain for the help. :}

I try and try..the more I do, the behinder I get

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