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Hot Water Overrun
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<blockquote data-quote="Teleblaster" data-source="post: 518862" data-attributes="member: 34050"><p>Hello, looking for helpful advice please.</p><p></p><p>I have a conventional fully pumped central heating system with a 3-way zone control valve. When run on the radiator system, after end of program the radiators dissipate the system heat and the overrun cuts out the boiler as it should. When run on the hot water system, which heat water fine, at end of program the heat seems trapped in the system and the <u>overrun keeps the pump going for hours</u>. There is a by-pass gate valve between the outlet and inlet side of the boiler. There is no heat-sink radiator. So all water in the hot-water circuit goes through the cylinder element or the by-pass system.</p><p></p><p>So am I missing something here? Why is the boiler not cooling of it's own accord and cutting the overrun and hence pump?</p><p></p><p>Many Thanks</p></blockquote><p></p>
[QUOTE="Teleblaster, post: 518862, member: 34050"] Hello, looking for helpful advice please. I have a conventional fully pumped central heating system with a 3-way zone control valve. When run on the radiator system, after end of program the radiators dissipate the system heat and the overrun cuts out the boiler as it should. When run on the hot water system, which heat water fine, at end of program the heat seems trapped in the system and the [U]overrun keeps the pump going for hours[/U]. There is a by-pass gate valve between the outlet and inlet side of the boiler. There is no heat-sink radiator. So all water in the hot-water circuit goes through the cylinder element or the by-pass system. So am I missing something here? Why is the boiler not cooling of it's own accord and cutting the overrun and hence pump? Many Thanks [/QUOTE]
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