I have to tell everyone that this is actually for my own boiler and not for a client.
I am having a problem with the boiler in my apartment that keeps air locking. The problem has been ongoing for about 4 years now and is getting worse. Recently 4 spirovents were installed on the baseboards, a expansion tank was installed, and a pressure regulator valve was installed. The system holds pressure and there isn’t any signs of water damage in the building that would indicate leaks in the system. Circulator pump is working normally too.
We figure that the make-up water probably has a lot of air in it, but the spirovents should be taking care of this at the baseboards and at the air scoop a the top of the boiler. Anyone have any other ideas why the system would keep air locking? If you need more specifics, I can provide you with what I know about it.
The boiler is somewhere between 13 and 20 years old. The water that is drained to clear the air locks is always very dark rusty water. There is also stains around the vents in the spirovents that were just recently installed about a month ago from the rusty water or air bleeding out.