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Old 02-16-2015, 12:45 PM   #1
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A/C Unit in 1980 TT

I cannot figure out how to turn on my AC in my TT. Here is what I have to work with:




I have scoured the TT for controls, there IS a roof unit. I am wondering if 1) once I get the A/C functioning, will it be sufficient in the desert at 105' plus and 2) how the heck do I turn it on??
Thanks guys!
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Old 02-17-2015, 01:02 AM   #2
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The A/C is controlled by the wall thermostat which must have 12 v DC power to operate. The 12 v is supplied by a house battery or a converter/charger that keeps battery charged and provides 12 v power for all needs when plugged in to shore power. The A/C also needs to be connected to shore power. Your first photo showed the return for the A/C, you should also have other louvered vents in the ceiling for the cold air to blow out. The outlet shouldn't be the only way to get power into the RV, it would require a cord with male prongs that would be live and very dangerous. There should be a place in a compartment or on the outside somewhere with a power cord or at least an outlet to plug in probably a 30 amp shore cord.
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Old 02-24-2015, 07:06 PM   #3
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I took it into the RV service dept today and I was told that there is indeed a roof unit but no controls, and it was never wired for controls. How on earth is that possible? They are charging $120 for control panel and $170 to put it in. And it is a big MAYBE on whether or not the A/C roof unit is functioning. They said they cannot tell unless it is wired up. I told them to go ahead and do it but....I'm wondering if there is a better way.
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Old 02-25-2015, 12:16 AM   #4
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Perhaps a previous owner changed out the A/C and heat thermostat with a cheaper, heat only one. Of course the mystery is why there are no wires from the rooftop unit to the thermostat. Hope it works for you!!
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Old 02-25-2015, 01:08 PM   #5
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it is possible that as in the previous post the last owner changed out the thermostat. you can take the thermostat off the wall and see if there are extra wires not connected. that might be the AC, now, why not have controls? might be a bad unit and they didnt want or could afford to replace so they just changed out the old thermo.....
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