Air in Boiler Pipes

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Old 11-13-08, 10:50 AM
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Air in Boiler Pipes

I have an old Burham Series 2 boiler. I recently replaced the expansion tank and now when I turn the heat on it sounds like running water. I tried to bleed the air out but haven’t had any luck. I have done it with the system cold and with the circulator running. The system is 1 zone and heats the basement as well as the 1st floor. I have included pictures too. Any idea what I might be missing, maybe I am not waiting long enough for all the air to come out. Also the pressure is about 15-20psi depending on the temp.

Thanks for any help.

<img src=http://www.cranntara.org/boiler/PB130440.JPG>

<img src=http://www.cranntara.org/boiler/PB130441.JPG>

<img src=http://www.cranntara.org/boiler/PB130442.JPG>

<img src=http://www.cranntara.org/boiler/PB130443.JPG>
 
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Old 11-13-08, 12:00 PM
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Nice photos.

Have you bled each of the radiators or baseboard units? Are you getting heat throughout the system? Do you hear the noise throughout the system or just in one place, e.g., from the circulator?
Doug
 
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Old 11-13-08, 12:58 PM
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It is baseboard and there are no bleeder valves. The noise is through the whole system sounds like a river, like the pipes are half full.
 
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Old 11-13-08, 01:33 PM
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I can't tell if there is an automatic air vent on top of the American Air Purger. If there isn't one, please install one. The valve connecting the expansion tank to the system might not be safe if mistakenly left in the closed position.
 
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Old 11-13-08, 02:09 PM
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Originally Posted by rupert326 View Post
I can't tell if there is an automatic air vent on top of the American Air Purger. If there isn't one, please install one. The valve connecting the expansion tank to the system might not be safe if mistakenly left in the closed position.

There is, well if it is a little canister looking thing with an air release (bike tire type release) valve on top. I assume that is air vent correct?
 
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Old 11-13-08, 07:52 PM
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So any ideas what I may have been doing wrong?
 
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Old 11-14-08, 05:04 PM
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In the last picture, there is a red handled ball valve.

When you connect the drain hose to the drain valve above that, if you don't close that valve, water will go right through the boiler and out the drain. Closing that valve forces the water through the boiler, through the zone and out the drain pushing the air with it ...

So, turn off boiler, let cool to 100 or less.

Connect hose.

Close red valve.

Open hose to drain.

When no more air, close drain, open red valve.

Hopefully this will do the trick ... it doesn't appear that you have a 'fast fill' on your water feed ...

Can you get a shot of what is connected to the top of the American Air Purger ?
 
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Old 11-15-08, 01:41 PM
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Originally Posted by NJ Trooper View Post
In the last picture, there is a red handled ball valve.

When you connect the drain hose to the drain valve above that, if you don't close that valve, water will go right through the boiler and out the drain. Closing that valve forces the water through the boiler, through the zone and out the drain pushing the air with it ...

So, turn off boiler, let cool to 100 or less.

Connect hose.

Close red valve.

Open hose to drain.

When no more air, close drain, open red valve.

Hopefully this will do the trick ... it doesn't appear that you have a 'fast fill' on your water feed ...

Can you get a shot of what is connected to the top of the American Air Purger ?
This is the top of the air purger.
<img src=http://www.cranntara.org/boiler/airvent.jpg>

Thats what should be there right?
 
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Old 11-15-08, 01:58 PM
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Yes, that's a float type automatic air vent ...

Is the red cap on top screwed down tight ? or left loose a few turns ? It should be loose for air to escape ...

If it's screwed down tight, and it leaks water when you loosen it, you need to replace it ... if no water leaks, leave it loose ...
 
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