Welcome! Here are the website rules, as well as some tips for using this forum.
Hydronic boiler system won't circulate
I have a single zone system in a house that suffered a freeze up and sat vacant for years. I repaired every break in the house plumbing and most all of the ancillary stuff on the boiler (circulator pump, purge valve, etc). The boiler fires up and I have domestic hot water, however, I either can't get the system bled of air properly, or something is preventing the system from circulating hot water. It seems strangely plumbed to me, and I am thinking about cutting in a ball valve and spigot just above the circulator to ease in bleeding the system. I have bled air out of both the two radiators that have bleeder screws, as well as two spigots on the return, located just upstream of a 'thrush balancer' about 12 feet from the boiler. This one's got me confused. Pics coming and thanks in advance for any help!