I recently purchased a home with a boiler/baseboard heating. The problem I was having was that only one zone worked. On other forums, it was suggested that I "power purge" the 2 zones that were not working, but I didn't get any info on how to accomplish that. I have attached links to pics of the system here:
The problem is that all the links/tutorials/youtube videos of purging a boiler system show the automatic boiler fill valve coming in on the supply side. With this one, the fill valve goes in right with the 3 return valves, just prior to the air scoop.
I have tried adapting the bleeding process by closing all supply and return valves, except one supply valve. I then manually open corresponding solenoid. I then run the system all the way up to 30PSI with the manual lever of the boiler fill valve. The intent is to push the cold water through the boiler, and out to the zone.
I then close the supply spigot, open the return spigot from the zone, and open the blue upside down spigot. I tried that about 10 times, and all I appear to be doing is pressurizing the big gray tank, and bleeding that pressure off when I open the blue spigot. The boiler is still hot, and if the cold water was flowing through it, I would think it would start cooling off.
Does anyone have any insight on how to bleed/power purge this system? Thanks.