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Posted by HeatPro on December 07, 2004 at 06:31:08:
In Reply to: Re: air in hydronic system despite automatic vents posted by Dave on December 07, 2004 at 03:17:21:
: How would I figure what would be 4 psi at the top?
Whatever the gauge reads on the boiler when water trickles from the upstairs vent, when you close the upstairs vent, add 8 more feet or 4 more pounds to the gauge:
http://64.226.150.132/hydronic/service/purgeair.htm