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Posted by Dave on January 12, 2006 at 15:06:48:
In Reply to: BOILER EXPANSION TANK posted by JOE on December 31, 2005 at 13:43:38:
: ...And there is a little unit on top of the line right above expansion that look like some kind of a pressure release. It has a little thumb wheel on it you can turn and it is loose, what is that for?
I think this is the air release valve for the air scoop. This is supposed to let any air out that is picked up in the scoop, right above the expansion tank. The plastic thing is just a plug that is supposed to be kept loose - it's really just a dust cap; if you take it out and look at it, you'll see a channel in the threads to allow air to release even if it were tighten up.