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purging air from heating system
I have a baseboard heating system, with some radiant heat zones. I am trying to purge the air out of the system, because one zone is not heating. The thermostat is on, the zone is on of the TACO switch relay, the circulator pump was hot, but still no heat at the baseboard itself. I pulled down the shutoff valve to close the circuit and then open the return screw valve, but no water comes out. I tried this on the other zones that are working and still no water comes out, so it's something I'm doing wrong. Now after watching multiple videos on YouTube there is a step to manually open the zone valve... except I don't have any zone valves. I have TACO circulator pumps on each zone and TACO Flo-Chek valves above each pump. But I have no typical zone valves with automatic/manual switch options. I'm assuming the flow check valves are acting as the zone valves, but how do I open them up to allow water to dump out the return spigot?
I've attached pictures and am hoping someone can clear this up for me.
Thanks for any help or clarification. I hope I am referring to the different parts correctly, so please pardon my ignorance.