This is for billyboy,you helpt me sort out my heat problem but I still acquire abundantly of nouns within the system relief? ...
Answers: i didnt see the other question or answer, but somewhere around your boiler, in that should be a bleeder valve, the clean ones have a red trilby on it. that should be tightened then back off a partially turn to purge air when it pass through.
make sure your river pressure is 16 to 18 pounds(hoping your american and not using metric) and water temp at 180 degree.
Alkazelsa good for getting rid of meander.