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kb7uxe · 01-01-2015, 11:42 PM

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 ) :-)

**CountryFit** · 01-03-2015, 10:19 PM

hard to imagine an electronic board designed for on 24v AC now works on 12v DC... i am learning new things...

draboo · 01-04-2015, 01:20 AM

Quote:

Originally Posted by CountryFit

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.

rssnape · 01-04-2015, 03:59 AM

I'm guessing that you will go through batteries quickly.

1997 Tiffen Allegro Bus 37', Cat 3126

kb7uxe · 01-04-2015, 11:22 PM

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.

kb7uxe · 01-04-2015, 11:28 PM

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.

cwit · 01-05-2015, 06:31 AM

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.