Air in heating water line

[djmodracek]

I have 3-zoned hot water baseboard heating system via a Burnham gas boiler. Recently I have been having to bleed my upstairs zone line of large amounts of air about once a month. It will bleed fine and I won't hear any gurgling in the pipes for a month or so, then all of sudden when the heat kicks on, it will sound like I'm in an aquarium. It also only does this in the one zone (upstairs). Would anyone happen to know where I could possibly be getting so much air into the line?? And if so, how to fix it.

[djken]

You have a leak somewhere. Find it and fix it.

[dan sw fl]

Originally posted by djmodracek
.. 3-zoned hot water baseboard heating system via a Burnham gas boiler.

It also only does this in the one zone (upstairs).

Add a few auto vent valves on this loop.

[t527ed]

find the leak.

[casturbo]

Originally posted by t527ed
find the leak.

Start at the boiler if you know what I mean.

[hvac wiz 79]

Originally posted by dan sw fl

Originally posted by djmodracek
.. 3-zoned hot water baseboard heating system via a Burnham gas boiler.

It also only does this in the one zone (upstairs).

Add a few auto vent valves on this loop.

yea & put the auto vents in at the highest point .. as air does rise u know..

[wally01]

Call a pro and have them find and repair the leak. Could be a combination of failures. Maybe a leak and a bad auto bleeder or leaky coin vent.

[hvac wiz 79]

i never did quite understand how a leak on a positve pressure line could introduce air .. can i be enlightened ...wouldnt the water just leak out ? i have worked on boilers many many times & have had systems with excess air problems .. even ones with major leaks .. but after repairing them leaks & pressure testing with all ok .. there was still an issure .. we added vents in all the right places & all is well .. also if the auto feed isnt working proper u will get air

[contactor]

water introduced to system contains absorbed air.When the water is heated,air is removed.

[tinknocker service tech]

possible the pressure isnt high enough
height and presure go together. you should be about 12 to 15 pounds pressure some times it can be nessasary to raise it to 20 it the loop is over 28 ft
are there any vents on the system if not the the air will always be there. have some installed or replace if they are because they may be defective

[wally01]

Originally posted by contactor
water introduced to system contains absorbed air.When the water is heated,air is removed.

Yep. Major leak, major air released when the water is heated. Get leak fixed and have a Spirovent installed to remove excess air. I never use auto bleeders over finished areas because I've seen too many leak causing damage.

[oil lp man]

Make sure the pressure is about 15- 20 psi. And temp is not over 200 degrees f. on the gauge when boiler shuts off on high limit. Steaming when the temp gets 220 or more will cause air in the highest floors. Also make sure air elimination devices are working correctly.
If the pressure is really low then the circulator will pull in air from hyvents etc.
Have you ever noticed when purging (with the circulator running) and the pressure gets low and the hyvent starts sounding off. But it is pulling air in. Keep the pressure around 20 psi with a 3 story building. 15 - 20 psi with a 2 story building.

[hvac wiz 79]

everyone here has great input ... i even learned something .. learning is awesome lol