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Posted by HeatPro on November 04, 2005 at 16:11:57:
In Reply to: excessive cycling posted by Simie on November 04, 2005 at 13:39:26:
Ordinary checks to find if there is sufficient flow on restidential systems look for a 20-degree drop from supply to return. Your difference of 40 degrees indicates that it is only half the flow needed, therefore, only half or less of the heat is being let out of the boiler, so it short-cycles.