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Posted by HeatPro on January 07, 2005 at 09:33:26:
In Reply to: Unintended gravity system? posted by Derek on January 07, 2005 at 07:34:58:
You write that you installed check valves after each circulator; that can be your problem. While a check valve doesn't permit flow through an unused zone backwards by a circulator on another zone, it doesn't have enough weight to stop gravity flow. In fact, sometimes with large pipes and high floors, a single flow check might not be enough and a balancing valve to add more resistance to the circuit or another flow control after the first might be required.
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