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Central Heating & Storage Heaters Forum
Viessmen 100T boiler wired within a Sunday Plan
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<blockquote data-quote="Rob_the_rich" data-source="post: 431526" data-attributes="member: 8419"><p>A hot water loop through the cylinder via a "field" pump which is also pumped via the pump in the combi which is switched on by a flow switch. Might explain why there is constant hot water demand, with the "field" pump off, there could be gravity circulation which will activate the flow switch in the boiler.</p><p></p><p>Never seen this setup before, usually the DHW side of the combi just serves, for example, a single hot tap and the stored hot water is used elsewhere.</p></blockquote><p></p>
[QUOTE="Rob_the_rich, post: 431526, member: 8419"] A hot water loop through the cylinder via a "field" pump which is also pumped via the pump in the combi which is switched on by a flow switch. Might explain why there is constant hot water demand, with the "field" pump off, there could be gravity circulation which will activate the flow switch in the boiler. Never seen this setup before, usually the DHW side of the combi just serves, for example, a single hot tap and the stored hot water is used elsewhere. [/QUOTE]
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Viessmen 100T boiler wired within a Sunday Plan
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