Bleeding Boiler Problem

Les Kanekuni

I've had to bleed my boiler twice already this heating season,
> which is twice as many times as I've had to in the 8 years I've lived
> in this 4th floor apartment, and it looks like I have to do it again
> today, just 5 days after the last time. What could be the problem? I
> have baseboard heat, there's a screw bleeder, but I get the best
> results bleeding the boiler itself. It's been the coldest winter in a
> few years, which two utility company techs pointed out, but it still
> seems like air's getting in. Maybe the pressure's set too high?
> 15-18lbs. Any infor would be much appreciated.
>

ed wallace

bleeding system

air is getting in somehow are there any obvios leaks that you can see any water dripping on floor check the circulater gaskets, boiler drain, draw offs, any gaskets you might have to remove boiler jacket to find any leaks check the air vents see if thier wet

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gman

how can air get in ,water should come out.unless the city water is high in (gases)?

ed wallace

air getting in

if you have a water leak then air can get into system as crazy as it sounds

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Jim_13

Expansion tank

You'll find that the expansion tank is air filled. Get the expansion tank back to it's proper level of water and air balance. You should never have to bleed air at a boiler that is piped properly. Air is brought into a system with the replacement water that automatically fills the system when water leaks out. The cold make up water has air entrained inside. That's how fish breathe. Cold water holds air and hot water releases air. The boiler heats up the replacement water and the air is separated from the water and thus creating havoc. Your problem is water leaking from your system. Fix the leaks. I will repeat this one more time, you should never have to bleed air at a properly piped boiler. One symptom has illuminated that you have one or more water leaks and the piping has been working but was not installed correctly.

Vasko Gjelaj

bleeding radiators doesn't help

Hello,
I own a 12 apt building and I have been having problems with last apt.on 3rd floor (3D) and sometimes 3C.
This is a baseboard hot water system.
When I bleed the radiators apt 3C seems to be ok for a while
The problem is apt.3D.
Boiler pressure is set at 20lb but I usually raise it temp.
before I bleed the radiator in 3D. Lots of air comes out in the proccess and then hot water appears. Then I put the presure back to 20lb.
This process might work for few days and air builds up again with no heat.

Vasko Gjelaj

bleeding radiators doesn't help

Hello,
I own a 12 apt building, 3 floors with 4 apts. on each floor and I have been having problems with last apt.on 3rd floor (3D) and sometimes 3C.
This is a baseboard hot water system.
When I bleed the radiators apt 3C seems to be ok for a while
The problem is apt.3D.
Boiler pressure is set at 20lb but I usually raise it temp.
before I bleed the radiator in 3D. Lots of air comes out in the proccess and then hot water appears. Then I put the presure back to 20lb.
This process might work for few days and air builds up again with no heat.
-I noticed that sometimes gas pilot fires few times and boiler goes on but sometimes it fires 20-30 times and then stops without turning the boiler on and then continues the same proccess few minutes later. It is set with Heat-Timer to go on every 5 minutes.
-Is the pressure too low and perhaps at 25lb pressure it would push the air?
-Could the automatic air vent(purger) be installed in boiler room, feeding or returning pipe so I don't have to bleed the radiators? (I do have the expansion tank)
-Could the circulating pump be the problem?
-Could that particular line be clogged up?

Vasko Gjelaj

bleeding radiators doesn't help

Hello,
I own a 12 apt building in Yonkers, 3 floors with 4 apts. on each floor and I have been having problems with last apt.on 3rd floor (3D) and sometimes 3C.
This is a baseboard hot water system.
When I bleed the radiators apt 3C seems to be ok for a while
The problem is apt.3D.
Boiler pressure is set at 20lb but I usually raise it temp.
before I bleed the radiator in 3D. Lots of air comes out in the proccess and then hot water appears. Then I put the presure back to 20lb.
This process might work for few days and air builds up again with no heat.
-I noticed that sometimes gas pilot fires few times and boiler goes on but sometimes it fires 20-30 times and then stops without turning the boiler on and then continues the same proccess few minutes later. It is set with Heat-Timer to go on every 5 minutes.
-Is the pressure too low and perhaps at 25lb pressure it would push the air?
-Could the automatic air vent(purger) be installed in boiler room, feeding or returning pipe so I don't have to bleed the radiators? (I do have the expansion tank)
-Could the circulating pump be the problem?
-Could that particular line be clogged up?
What could be the problem?