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Then, when the fridge approaches the set temp, does it act like a dimmer switch or an ON-OFF switch?
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ON-OFF switch
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Asked another way, is there a measured value of resistance "we" consider OPEN or infinite that is not really OPEN?
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It's ether OPEN all the way or shorted (closed). It's nothing more then a switch the operates on temp.
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Also, the "long reach stem? on the thermostat in my fridge has a cover on it its entire length. I assume this is an important part of it, but why?
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It helps to insulate it.