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Do-It-Yourself (DIY) Question & Answer Forum
Using a contactor
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<blockquote data-quote="kme" data-source="post: 23614" data-attributes="member: 113"><p>Carter:</p><p></p><p>The electric UFH units also have a floor stat attached to them - primarily designed to stop the floor temp rising too high. (thermistor - 14K cold - 8K hot). <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>With regard to the contactor (s), the following points will need to be borne in mind:</p><p></p><p>1. keep the low current coil wiring between T-stat and contactor away from the heating coil wiring.</p><p></p><p>2. make sure you use BOTH poles of the T-stat switching for the contactor; i.e. don`t just use the phase. It tends to send EM pulses back to the stat when contactor (de) energises, and upsets the stat.</p><p></p><p>3. It is usually necessary to put a capacitor across the contactor coil. Again, cuts down the EMI, and negates callbacks.</p><p></p><p>You will possibly find, if you call the helpline, they`ll tell you no. 3 is not required. DON`T listen to `em. I`ve had the problem, and it took a while before I could stop the t-stat resetting, losing all programmed times, and the current time, every time the contactor switched OFF.</p><p></p><p>HTH</p><p></p><p>KME</p></blockquote><p></p>
[QUOTE="kme, post: 23614, member: 113"] Carter: The electric UFH units also have a floor stat attached to them - primarily designed to stop the floor temp rising too high. (thermistor - 14K cold - 8K hot). :) With regard to the contactor (s), the following points will need to be borne in mind: 1. keep the low current coil wiring between T-stat and contactor away from the heating coil wiring. 2. make sure you use BOTH poles of the T-stat switching for the contactor; i.e. don`t just use the phase. It tends to send EM pulses back to the stat when contactor (de) energises, and upsets the stat. 3. It is usually necessary to put a capacitor across the contactor coil. Again, cuts down the EMI, and negates callbacks. You will possibly find, if you call the helpline, they`ll tell you no. 3 is not required. DON`T listen to `em. I`ve had the problem, and it took a while before I could stop the t-stat resetting, losing all programmed times, and the current time, every time the contactor switched OFF. HTH KME [/QUOTE]
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