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Wiring for Nest thermos with Central heating and Underfloor heating
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<blockquote data-quote="GEM Electrics" data-source="post: 521285" data-attributes="member: 32465"><p>Probably too late now but I agree absolutly with [USER=17152]Sharpend[/USER]. The demand from the Central Heating Nest goes to the demand on the Honeywell (left) controller (Brown) NB on these valves Grey is permanent live. The dedicated controll box will have a demand input which is connected to the other Nest demand output, connections for the pump, valve and and the three UFH zone valves, and finally a demand output. A micro switch in the Honeywell and a relay in the dedicated controller provide isolation of their outputs so that they may be joined together to go back to the boiler demand and will not interfear with each other.</p><p></p><p>So very like an S Plan where the dedicated controller replaces one of the valves.</p><h4></h4></blockquote><p></p>
[QUOTE="GEM Electrics, post: 521285, member: 32465"] Probably too late now but I agree absolutly with [USER=17152]Sharpend[/USER]. The demand from the Central Heating Nest goes to the demand on the Honeywell (left) controller (Brown) NB on these valves Grey is permanent live. The dedicated controll box will have a demand input which is connected to the other Nest demand output, connections for the pump, valve and and the three UFH zone valves, and finally a demand output. A micro switch in the Honeywell and a relay in the dedicated controller provide isolation of their outputs so that they may be joined together to go back to the boiler demand and will not interfear with each other. So very like an S Plan where the dedicated controller replaces one of the valves. [HEADING=3][/HEADING] [/QUOTE]
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Wiring for Nest thermos with Central heating and Underfloor heating
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