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Old 08-25-2019, 09:42 AM   #1
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Removed furnace, now AC won't run

My husband and I are doing some mods to our 5th wheel, and decided to remove the furnace (Florida folks), and put in a fireplace. My husband tore out the old furnace, and tossed it, but when we tried to turn the AC on, it no longer functions. Neither the fan nor the compressor will come on. We replaced the original thermostat several years back with a Hunter, and it still works, so that isn't the issue. It turns out that there were several wires (matching the colors going into the thermostat) plugged into the furnace that my husband ripped out, and if you jump one of them (blue) to the 7.5 DC wire, the fan will turn on, but no compressor.
I'm guessing that the wires to the furnace also connected to the AC unit, and that is our issue, but I have no idea which ones, and I'm a little hesitant to just start jumping by trial and error, lest I burn out the AC somehow.
Does anyone know how an RV furnace generally wires to the AC, or how to wire the AC directly to the thermostat, bypassing the furnace?

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Old 08-25-2019, 11:52 AM   #2
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Post BRAND & MODEL of Furnace & A/C Unit.

That information would be helpful for responses

Is it time for YOUR Medication or Mine?
Dodge 3500 w/Tractor Motor & NUWA 5vr
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Old 08-25-2019, 11:57 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

That's way above my pay grade but I bet Old Biscuit can figure it out if you give him the info on the furnace! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 08-25-2019, 12:15 PM   #4
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Sorry about that. AC is a Coleman Mach something, was a direct replacement a few years back for Coleman Model 7333A8664 , furnace was Atwood Excalibur 8535-III
There were 4 wires going into the furnace, +12 volt DC, -12 volt DC, thermostat, and +thermostat. Connecting the +12 volt DC wire and the +Thermostat wire causes the fan to turn on, but not the compressor.
I know that the issue is likely 12 volt power to the AC board somehow, but not sure how to rectify the issue.
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ace, furnace

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