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Old 01-02-2015, 12:42 AM   #15
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the unit on the wall is only a switch power by battery.
the old switch was powered by a bi-metal spring.
yes, house system switches 24V,
RV is 12V,
but the t-stat is a switch and doesn't care what voltage it is switching.
( to a point ) :-)
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Old 01-03-2015, 11:19 PM   #16
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hard to imagine an electronic board designed for on 24v AC now works on 12v DC... i am learning new things...
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Old 01-04-2015, 02:20 AM   #17
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Quote:
Originally Posted by CountryFit View Post
hard to imagine an electronic board designed for on 24v AC now works on 12v DC... i am learning new things...
There is no power hooked up to this thermostat except for the batteries. So, I m guessing that the stat is only acting as a switch powered by the two AA batteries. No?

It's been a few days now and it is still working great after I wired it like in the diagram I posted. I haven't tried it in AC/cool mode yet.
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Old 01-04-2015, 04:59 AM   #18
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I'm guessing that you will go through batteries quickly.


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Old 01-05-2015, 12:22 AM   #19
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the old one is a BI-METAL SPRING that unwinds as it gets warmer.
as it unwinds, the end moves away from it's contact, opening the switch.
As it cools, the wound BI-METAL spring winds until the tip makes contact, closing the switch. It requires absolutely no power to operate.
kinda like a light switch on the wall only in place of your finger, it uses a bi-metal coil to move the switch up or down... so weather it's 1V or 1000v it's just a switch and is only limited by the quality and composition of the contacts . Some times they even use a small capsule of mercury to make the contact as the coil winds or unwinds.
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Old 01-05-2015, 12:28 AM   #20
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mind you hypothesis is based on supplied information that an old style 2 wire unit is being removed, and a newer multifunction unit being installed, and the original poster has not provided any further information on what was removed or how it was wired.
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Old 01-05-2015, 07:31 AM   #21
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The hunter t stat has been around forever and the battery's will last at least a year or longer. Made life much better with a 2 degree temp spread over an 8 degree spread.
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