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Posted by HeatPro on April 08, 2008 at 11:52:24:
In Reply to: Re: How would I purge air from hydroair system in attic? posted by Dave on April 08, 2008 at 08:11:00:
Contact sensitivity in the flow switch might be your issue. It's going to be chance coming across a switch that is reliable.
http://www.ameritrol.com/#
You might try a pressure differential switch with sealed contacts
http://www.omega.com/pptst/PSW-180.html
http://europe.hbc.honeywell.com/products/ecatdata/pg_ddcm.html