Proper way to purge air out of baseboard

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Old 03-27-18, 08:55 AM
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Proper way to purge air out of baseboard

I have a baseboard system with 5 zones. What is the proper way to purge air out of it? Should I put the zone valves in the OPEN position?

Thanks for your help!
 
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Old 03-27-18, 11:20 AM
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a,
There is a process to bleed a system right but to answer your question about the zone valve position ,YES, you manually open the ZV of the zone you are bleeding so the water can circulate through it.
 
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Old 03-28-18, 06:45 AM
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What is the proper way to purge air out? Thank you.
 
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Old 03-28-18, 07:20 AM
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A,
The first thing you do is shut down your boiler. Never bleed system with pump running.

Isolate all zones except the one you are bleeding.

With your fast fill feature on your auto feeder increase boiler pressure to at least 25psi but under 30, so relief valve doesn't blow.

This is your bleeding pressure that will run through your zone to be bled.

Naturally all ball valves or equivalent are closed between the boiler and draw offs.

Keeping that steady pressure through the zone, open up the draw off and bleed the air out until you get a nice steady steam of water. Don't be in a rush, make sure all the air is out. When your satisfied close the drawoff and fast fill lever.

You should still have about 25 psi in the boiler at this point.

Close that zone and repeat procedure for other zones.

When all zones are bled, drain excess water from system until you reach your desired operating pressure. I run mine at 18-20 psi.

When all through put everything back to normal and test system.

The reason you bleed at the high pressure is that when you are done bleeding no fresh water feeds back in to bring air back into the system from the auto feeder.

Hope this helps a little.
 
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Old 03-28-18, 02:01 PM
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asperber What is the proper way to purge air out? Thank you.

There is not a rigid, multi step protcol for venting hydronic system air.

As long as system has 12 psi or so, open a vent until water appears, then close it.

If gauge pressure drops to few pounds, add water to 12 psi and continue venting.

In some systems there may be several places to vent. Vent all of them.

System water pressure regulator should bring it back to 12 psig.

If there was a lot of air in system you might have to repeat process.
 
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