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Do-It-Yourself (DIY) Question & Answer Forum
Using a contactor
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<blockquote data-quote="BigNick" data-source="post: 23564" data-attributes="member: 1418"><p>I am hoping that someone can help with a problem I have been asked to solve regarding a thermostat control for underfloor heating. My learned old sidekick is on holiday for a week so I can't ask him.</p><p></p><p>The problem seems to be a thermostat controlling a large under tile wire heating system which must have the contacts fused on, as the floor just keeps on getting hotter.</p><p></p><p>It is on a 50A breaker so is drawing a high load and wired in 10mm2 T+E. From the little I know of such things I am guessing it should have had a contactor between the thermostat and the load, which would have protected the thermostat in a similar fashion to their use for car headlights.</p><p></p><p>The customer said their old electrician wired it for them but he's retired to spain and there is no paperwork.</p><p></p><p>The board is in the room and is just over a year old but the heating has only been used for the last few months, so the question is should I put in a contactor and a new controller, and if so, as I have never seen one, do they need an enclosure or do they come as a surface mount box?</p><p></p><p>Hope someone can help,</p><p></p><p>Nick.</p></blockquote><p></p>
[QUOTE="BigNick, post: 23564, member: 1418"] I am hoping that someone can help with a problem I have been asked to solve regarding a thermostat control for underfloor heating. My learned old sidekick is on holiday for a week so I can't ask him. The problem seems to be a thermostat controlling a large under tile wire heating system which must have the contacts fused on, as the floor just keeps on getting hotter. It is on a 50A breaker so is drawing a high load and wired in 10mm2 T+E. From the little I know of such things I am guessing it should have had a contactor between the thermostat and the load, which would have protected the thermostat in a similar fashion to their use for car headlights. The customer said their old electrician wired it for them but he's retired to spain and there is no paperwork. The board is in the room and is just over a year old but the heating has only been used for the last few months, so the question is should I put in a contactor and a new controller, and if so, as I have never seen one, do they need an enclosure or do they come as a surface mount box? Hope someone can help, Nick. [/QUOTE]
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