I have a new home and need to bleed the boiler system as it is too noisy. I have checked the side of the vent and it seems to have some kind of small special tool that I have never seen before that fits like an backward allen wrench. How do I work it? Do I just turn it to the left to let the air out? Do I do that to each vent? Or do I have to shut the system down? I am afraid of breaking it. I think it might be a keyed vent (?? )
And where exactly do I add water to the system again? In the basement where the boiler is located? Help! I need details. Thanks!