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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Not quite correct. The 12 volts DC supply to the air conditioner electronic control box is directly wired from the power distribution panel DC bus in the RV directly to the air conditioner control module..
As long as battery is installed and cut off switch not engaged there is 12 volts DC power supplied to that control box on top regardless of whether you are plugged into shore power or not.. the converter has nothing to do with the DC supply going to that AC control module...
There is no voltage divider network doing what you are describing. The Thermostat...if it is LCZ or CCC2 gets its 12 volts DC power from on top of the AC unit via the control box.. it is routed down t9 thermostat using a 4 wire telephone cable
2 of those wires supply 12 volts DC and GROUND to thermostat unit. The other 2 wires are used as a BUS line to communicate signals from thermostat to control module on air conditioner on top of roof...
That’s the way the system works.
As long as battery is installed and cut off switch not engaged there is 12 volts DC power supplied to that control box on top regardless of whether you are plugged into shore power or not.. the converter has nothing to do with the DC supply going to that AC control module...
There is no voltage divider network doing what you are describing. The Thermostat...if it is LCZ or CCC2 gets its 12 volts DC power from on top of the AC unit via the control box.. it is routed down t9 thermostat using a 4 wire telephone cable
2 of those wires supply 12 volts DC and GROUND to thermostat unit. The other 2 wires are used as a BUS line to communicate signals from thermostat to control module on air conditioner on top of roof...
That’s the way the system works.
