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Posted by Harold hydronicnetwork.net on December 02, 2003 at 12:41:23:
In Reply to: Main Fill Valve posted by David on December 02, 2003 at 11:40:44:
It is always wise to follow the manufacturer's directions. Read all of:
http://64.226.150.132/hydronic/service/purgeair.htm
and make your own opinion.
The system never has to be flushed if you don't allow leaks.