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Posted by HeatPro on December 07, 2004 at 11:12:36:
In Reply to: Re: air in hydronic system despite automatic vents posted by Dave on December 07, 2004 at 10:40:34:
: Now, say for arguments sake that the pressure when water trickles out of the upstairs vent is 20 psi, so I should set the operating pressure at 24 psi. What should I set the pressure for the autofill valve and the Extrol expansion tank?
The same - 24 psig - that is your cold fill pressure; anything lower and you don't have the conditions to hold the water up there.
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