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Posted by Harold hydronicnetwork.net on January 27, 2004 at 10:03:21:
In Reply to: Re: Circulator failure signs - do I have them? posted by Harold hydronicnetwork.net on January 27, 2004 at 09:57:53:
The clue about the increased noise when only one zone is open is also information that the circulator can be getting into cavitation due to a restriction on the intake side of the circulator from length and diameter of the tubing and a relationship of the circulator to the expansion tank. Having multiple zones and a 4-way valve can make a complex problem.
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