Need advice RE: purging air from baseboard hot water heating system
I purchased a home that has baseboard hot water heating, two zones.
For one of the zones, there are two pipes within the baseboard, it comes in to the room on an upper pipe which goes around the room then bends and goes back through the bottom of the baseboards (the lower pipe has the metal fins around it) to get back to the boiler.
there are no bleeding valves on the baseboards, but in this zone the top pipe gets hot and the bottom one stays cold.
I can't get this zone above 61-63 degrees.
I do have a bleeding valve above the circulator (there's one circulator for the whole system)
I have located my two zone valves, those seem to test out ok, both of them get hot on the other side of the valve when i manually open them.
What is the best approach to get the air out of the problematic zone?
I was thinking the best way is to close the send and return valve for the working zone, close the valve above the circulator and open the bleeding valve and the feeder valve for that zone.
I was then going to use the "fast fill" valve to purge the air out of the system by pushing water through with the bleeding valve open. My problem is it seems my fast fill valve is broken or doesn't provide enough pressure even when it's lifted to the vertical position.
I don't know much about heating systems, i've just been picking up info while looking in to this problem. To be honest i dont know if the feeder valve shown in picture #1 is even supposed to be able to force the air out of the system.
When trying to purge the air like this eventually nothing was coming out, i was able to get it to push some air out and water then eventually the water stopped coming out of the bleeding valve.
When i closed everything up the system came back up to normal pressure (12-15psi) so it seems the feeder valve is working but i can't use it as a "quick fill" to force the air out of the system.
There's also a drain valve on the bottom of the boiler.
Is it an option to hook up a garden hose to the drain valve at the bottom of the boiler and pump water in to the system from an outside water faucet through that valve?
I've attached a few pics of the system that shows the fast fill valve, bleeding valve and the lower valve.
Last edited by mikenri; 01-19-2011 at 04:08 PM.