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no shut off between boiler and air eliminator
Hi, I'm trying to purge my system of air. It was built in the mid-70s, and for whatever reason, there are no purge valves on the baseboards. Apparently no one has thought to change this prior to us moving in. It's a three zone system, and there are no shut off valves for each zone. So, my questions are:
1. do I engage the motor to open up each zone to purge?
2. there doesn't seem to be any air popping out of the drain when I bleed. How long do I need to bleed?
3. Since there is no shut off between the air eliminator (supervent) and the boiler, will there be pressure if I attempt to change the head, or clean it?