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Posted by HeatMan on July 20, 2006, 10:11 pm
> I have a motorhome that uses a 12VDC
> thermostat to control the AC/Heatpump
> and the propane gas furnace. The
> thermostat is a real piece of juink. It
> overshoots, undershoots and generally is
> not very good. It is, however, an
> electronic unit. I would like to
> replace it. I found a nice Honeywell,
> RTH7400D which looks like it might work,
> but the Honeywell Tech Supports says
> that it's not rated for use on 12VDC.
> However, it can be made to run on
> internal batteries and it does have
> relay contact outputs. So, I would
> think ..... But, anyway, does anyone
> know of a good AC/Heatpump/gas furnace
> thermostat that could operate a 12VDC
> system? BTW, I would ask this in the RV
> News Groups, but I think it is too HVAC
> specific for those NGs.
> Thanks,
I'm not familiar with that particular tstat, but if it's battery operated,
it should work. The batteries switch a relay.
I look at it like amping a starter on a vehicle. the ammeter only sees amps
and has no idea if it's AC or DC.
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