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Posted by HeatPro on March 29, 2005 at 22:01:08:
In Reply to: Re: Temp. overshoot posted by Rick on March 29, 2005 at 21:46:52:
When the thermostat is calling for heat, the burner is on heating the inner wall of the boiler. When the thermostat is satisfied, the burner goes off and the excess heat in the chamber migrates to the water in the boiler. So to prevent the overshoot, flowing water must dissipate the extra heat after the burner shuts off. This can not happen unless there is a delay for the water to continue flowing some time after the burner shuts off. Either by putting a delay to shut the circulator off fter the burner, or keeping the circulator running after the burner shuts off. A three-way valve to switch the water flow from the heated areas to the water heating tank coil with the circulator running all the time satisfies that condition.
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