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Old 11-30-2013, 04:10 PM   #1
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Bleeding air from heating system


Hello all,

My question goes to the process of bleeding air out of the water pipes from my home heating system - baseboard water heat. We get almost no heat in the downstairs of our home. Following "How To" videos, I bled two of the three pipes with faucet type releases, by opening up the valves with the spigot connected to a hose and closing the return valve (immeditely below the spigot). This seemed to go well for two of the pipes. When I tried the third one, no water came out, and the whole system began to make omonous noises, then proceed to shake and spew steam. It was pretty alarming. I shut off the spigot and opened the return valve and called it a day. What did I do wrong? I live in Doylestown, PA - just north of Philly. Thanks!

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Old 11-30-2013, 07:48 PM   #2
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Bleeding air from heating system


Post pictures of your piping layout around the boiler of the zone that you are having problems bleeding.
Stupid question first...Did you just bleed your two other zones dry or did you force out the excess air from those two zones?

No water coming out (just steam) normally indicates a huge amount of excess air and something obstructing the boiler water feed from supplying water to your opened faucet.

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Old 11-30-2013, 08:27 PM   #3
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Bleeding air from heating system


Did you check the water in the boiler after bleeding the lines?
The air in the lines was taking place of water in the system and giving you a false pressure reading.
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Old 11-30-2013, 08:54 PM   #4
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Bleeding air from heating system


I checked the pressure gauge while bleeding the pipes and used the lever on the dome shaped valve that regulates water intake to keep the psi at 20, which is where it was when I started. Is there another way to check the water in the boiler?

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Old 11-30-2013, 09:26 PM   #5
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Bleeding air from heating system


When bleeding a zone, you want to force the water from it's source (that bell domed pressure regulater) through that zone to the drain point exit.
A pump, stuck zone valve or a closed gate valve between the two are usually the only things that would prevent the water from flushing out the Zone.
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Old 12-01-2013, 12:08 AM   #6
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Bleeding air from heating system


Quote:
Originally Posted by Freddtn59 View Post
I checked the pressure gauge while bleeding the pipes and used the lever on the dome shaped valve that regulates water intake to keep the psi at 20, which is where it was when I started. Is there another way to check the water in the boiler?

Thanks!
Yes you should have a pressure release valve. It has a long copper pipe on it. You could pull the lever and see if water comes out. This would mean boiler has water.
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Old 12-01-2013, 11:30 AM   #7
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Bleeding air from heating system


I attempted to post pictures from my flickr account, but I'm not sure it worked. If it did post, the zone that was the problem is the one on the right as you view it. It sounds like the problem may be a stuck or closed gate valve. I'm thinking that the gate valve is the valve right below the spigot? I did turn the valve closed before starting to bleed the pipe. It seemed to work.
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Old 12-01-2013, 11:52 AM   #8
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Bleeding air from heating system


Trying again.

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