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air problems with baseboard zone
having problems with air on a first floor baseboard zone. had same problems last season as well. replaced air vent at the boiler tapping. it is a weil mclain CG4SPDN. purged the zone. do not have trouble with second floor zone. circulator is on the supply - TACO 007 with a flow check. expansion tank and fill valve are on the return. the boiler runs 180 degrees at 20 PSI.
What could be causing air to to be continuously coming back into the baseboard zone? Any help would be appreciated.