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Old 09-29-2017, 05:50 PM   #1
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3M Honeywell Thermostat

Has anyone tried to install one of these in a travel trailer? I have an analog thermostat now. We just had our home air/heat pump replaced and they installed a new wifi thermostat so I have my old thermostat and thought I could try installing it in the trailer. I installed it in the house 7 years ago and it was pretty easy. I don't really need the wifi part but having a digital thermostat would be nice. I'm not sure this is my exact model, but it's pretty close:

Radio Thermostat 7-Day Wi-Fi Module Programmable Thermostat-CT50e Wifi - The Home Depot
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Old 09-29-2017, 10:05 PM   #2
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Upgrading to a digital thermostat is something that most of us have really liked after it's done.

The one thing you'll likely have to give up is the Hi/Lo fan speed switch. You can either pick one or the other and have it all the time, or you could (if you find it so necessary) add a switch somewhere.

It's not rocket science to install a Honeywell, but there are some wiring differences. I used the drawing below. Note that this is for thermostats that use batteries internally. Usually two AA or AAA's. If yours doesn't use batteries, it may be designed to use 24VAC, not 12VDC, and you should not rely on this wiring.

Be sure to watch that ground connection between systems. Miss it and something won't work afterward. Note that it doesn't connect to the Honeywell, and it would only if the unit was being powered externally.

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Old 09-29-2017, 10:43 PM   #3
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3M Honeywell Thermostat

That Honeywell uses 24VAC for power, I believe your existing system uses 12vdc.

I'd be really surprised if it works. It could, depending on if the thermostat is 12vdc compatible or not.

Your stat does use batteries, but only for memory retention. Most residential thermostats are not designed for RV system usage.
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Old 09-30-2017, 01:51 AM   #4
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It depends what brand of RV air conditioner do you have, and which revision
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Old 09-30-2017, 12:44 PM   #5
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I understand you want to reuse the old unit. Just wanted to throw this out.

Based on a forum discussion earlier this year I picked up this theromostat and it was a quick install.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Love the digital control. ;-)
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Old 09-30-2017, 02:04 PM   #6
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So I looked at the manual for the thermostat I listed above. I do think it is 24V so I am guessing my thermostat won't work. Thermostat diagrams on page 5 and a lot more details on page 13-18 - http://www.homedepot.com/catalog/pdf...007d27f02c.pdf
The instructions do say that the batteries are only for memory.

I watched the following video but maybe that thermostat runs on 12V -
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Old 09-30-2017, 02:23 PM   #7
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I installed this Honeywell thermostat 3 years ago. It's switching is powered by the 2 AAA batteries. Works great.
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Old 09-30-2017, 02:34 PM   #8
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I was just looking at these two. I can't really figure out what the difference is between them.

Cheaper - https://www.rvautoparts.com/8330-386...QaAhfgEALw_wcB

Slightly more - https://www.rvautoparts.com/Coleman-...1_p_22346.html
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Old 09-30-2017, 02:41 PM   #9
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Looks like one is for a heat pump and one is not? I didn't know RV's had heat pumps. I thought they were all an air conditioner and separate furnace.


8330-3862 vs 8530-3481
http://www.rvcomfort.com/pdf_documen...tats_copy1.pdf
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Old 09-30-2017, 03:57 PM   #10
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Quote:
Originally Posted by Nunyadamn View Post
Looks like one is for a heat pump and one is not? I didn't know RV's had heat pumps. I thought they were all an air conditioner and separate furnace.


8330-3862 vs 8530-3481
http://www.rvcomfort.com/pdf_documen...tats_copy1.pdf
Agree. Some have heat pumps.
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Old 09-30-2017, 11:52 PM   #11
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We still don't know which brand and model of RV air conditioner you have now, the wiring is different for older vs newer Duotherm / Dometics, and Coleman's are also different in ways from the Dometics. Some you can convert to certain Honeywell / Hunter thermostats, some you can't
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