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Old 02-17-2020, 11:25 AM   #1
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Help with wiring new thermostat

I have the dometic 3 wire set up, wanting to change to Honeywell rth221b. Have extra wires in wall. Can someone help with hiw this should be wired at new tstat and at ac unit?
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Old 02-17-2020, 11:31 AM   #2
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Quote:
Originally Posted by PDuffy73 View Post
I have the dometic 3 wire set up, wanting to change to Honeywell rth221b. Have extra wires in wall. Can someone help with hiw this should be wired at new tstat and at ac unit?
Youtube is your friend. search the make of A/C and the make of t-stat. How to wire.
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Old 02-17-2020, 11:57 AM   #3
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I have looked for days, found some old threads on here that speak of the wiring, but lloking for more info
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Old 02-17-2020, 12:00 PM   #4
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try this thread https://www.forestriverforums.com/fo...now-21391.html
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Old 02-17-2020, 12:06 PM   #5
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The extra wires are a plus as long as there are 3 extra wires in wall. You need either 5 or 6 wires between the thermostat and the A/C control box.

Now comes the other shoe. You will also have to change out the control box from the current digital communication model to an analog model in the A/C. It's not a lot of work, it's just a little bit of additional expense. Dyers is a good source for getting you what you need to do the swapout.
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Old 02-18-2020, 11:54 PM   #6
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X2 on dyers. Fast delivery and great price
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