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Under floor heating
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<blockquote data-quote="DonkeyDong" data-source="post: 28060" data-attributes="member: 156"><p>by the sounds of the cables you have, you have a problem unless you can locate the contactor at the room stat location - otherwise you need to change the cabling.</p><p></p><p>If there is room to fit a contactor there, then its an easy job. Either get a single pole contactor that is capable of the total current, or get a three pole one capable me switching each mat.</p><p></p><p>If its a single pole one, then connect the power to the room stat, connect the line/power to the switched common of the contactor. Connect all the mats to the switched l1 on the contactor. Common all the neutrals to the supply neutral. depending on the room stat you may need to power the switched output - if so bridge it from the line terminal. Does the room stat have dedicated terminals for the floor stat - are they seperate stats? If not dedicated terminals, connect the floor stat between the switched output of the room stat and the l1 of the contactor coil. Then l2 of the coil back to the commoned neutrals.</p><p></p><p>Simple <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>D.</p></blockquote><p></p>
[QUOTE="DonkeyDong, post: 28060, member: 156"] by the sounds of the cables you have, you have a problem unless you can locate the contactor at the room stat location - otherwise you need to change the cabling. If there is room to fit a contactor there, then its an easy job. Either get a single pole contactor that is capable of the total current, or get a three pole one capable me switching each mat. If its a single pole one, then connect the power to the room stat, connect the line/power to the switched common of the contactor. Connect all the mats to the switched l1 on the contactor. Common all the neutrals to the supply neutral. depending on the room stat you may need to power the switched output - if so bridge it from the line terminal. Does the room stat have dedicated terminals for the floor stat - are they seperate stats? If not dedicated terminals, connect the floor stat between the switched output of the room stat and the l1 of the contactor coil. Then l2 of the coil back to the commoned neutrals. Simple :) D. [/QUOTE]
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