Plus AND Minus 12v from AC to Thermostat
I have a Dometic A/C and a Dometic single zone thermostat. The thermostat requires plus AND minus 12 volts. The schematic of the A/C control box indicates that the plus AND minus 12v come from the pow...
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More confused than ever? It would help if you identified the models of the components involved and the problem you are trying to solve. Without knowing the components involved, any answers will be speculation and generalities.
I think its probably safe to say, what you are referring to as minus 12V is indeed 12V negative or 12V ground as others have suggested. Most things installed in an RV aren't fed directly from the converter, but +12V is fed from the load center. 12V ground is usually fed from a bus bar located in or near the load center.
As to your second question "why?", I believe you posted your own answer.
When you disconnect the power feeding the A/C control box, you disconnect the power feeding the thermostat.
I think its probably safe to say, what you are referring to as minus 12V is indeed 12V negative or 12V ground as others have suggested. Most things installed in an RV aren't fed directly from the converter, but +12V is fed from the load center. 12V ground is usually fed from a bus bar located in or near the load center.
As to your second question "why?", I believe you posted your own answer.
hiker08 wrote:
The schematic of the A/C control box indicates that the plus AND minus 12v come from the power converter and are passed on, thru connectors, to both the A/C control box and also to the thermostat.
When you disconnect the power feeding the A/C control box, you disconnect the power feeding the thermostat.
