I'm hoping someone can help me out here. Here is what I have. Hot water baseboard heat, 3 zone, 1 pump, 1 furnace - see pictures...
http://www.flickr.com/photos/29007430@N07/5250124739/
http://www.flickr.com/photos/29007430@N07/5250728274/
http://www.flickr.com/photos/29007430@N07/5250728422/
One of my zones does not work. I think the controlling unit, first picture above is bad but I can trouble shoot this, it may be air as well.
My question is, how do I get rid of air in the system? I can drain the system by opening the valves in the second/third picture and then the system refills. However, if you look at the second and third picture, the valves are kinda double, the knob and just below there is a slit for a screw driver that is a quarter turn. When I drain the system, should this second valve be open or closed?
Any direction on how to do this would be great. There are no bleeder valves by the individual radiators.
Linear Mode
