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Old 10-10-2013, 04:12 PM   #1
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wiring replacement thermostat

I'm fighting to replace that awful thermostat that came with our x23b. It's heat only, two wires. Red and white. Silly me, I thought this would be easy.

I purchased a Honeywell T87K heat-only thermostat which was great. Two wires, go. Except it had no switch to turn the heat on. So I figured it'd just work off the temp but setting it to 80+ and waiting and it would never kick on.

So then I read that I need fan control. So I bought a T87N which is much more complicated. It's got controls for air, fan, and heat. Except I've only got two wires. I wired it up, set the temp for 80+, turned the fan to on, the control to heat and nadda. Taking red to red and white to white I'm missing a wire for the fan control hookup on this unit it seems?

Anyone have any hints for me? I know there's other threads on this and I've poked around but it seems to be 'it matches wire for wire' with folks with a different setup.
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Old 10-10-2013, 04:25 PM   #2
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Re: wiring replacement thermostat

Here's a pic of the N unit.
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uploadfromtaptalk1381440284294.jpg  
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Old 10-10-2013, 04:25 PM   #3
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I'll be following along as I am also looking to change my mechanical thermo with a digital.......
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Old 10-10-2013, 04:35 PM   #4
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I found this thread.
https://www.jaycoowners.com/showthrea...ostat-Problems

It seems most people are using a Coleman 12V RV Thermostat.

The thermostat you reference looks like a 24V unit? Could that be the issue?

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Old 10-10-2013, 05:08 PM   #5
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Bah you're right. Put the digital one I also have here on and boom it works. Missed that these Honeywell ones weren't going to work. Thanks for the reminder to read all of the manual.
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Old 10-10-2013, 05:29 PM   #6
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Which one did you use? A Hunter digital??
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Old 10-10-2013, 05:32 PM   #7
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Quote:
Originally Posted by glsimms View Post
Which one did you use? A Hunter digital??
I used one of these:

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1

I saw it recommended elsewhere and ordered it at the same time as the honeywell. I had really hoped to not use it since I didn't want to use something that required batteries and I LOVE the look of the old dial thermostats but the 24v thing wasn't going to work doh!

With this one I pulled the red jumper off, wired the two wired up, and voila it's magic and works.
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Old 10-10-2013, 05:36 PM   #8
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Thanks mitechie....
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Old 10-10-2013, 05:41 PM   #9
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I spoke with Coleman and you cannot use a residential thermostat. It will eventually destroy the electronics in the heater or AC. I have a heat pump plus propane for low temperatures. I wanted to install an automatic residential heat pump thermostat. They said to not do it. They said that 24VAC thermostats will not work.
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Old 10-10-2013, 05:52 PM   #10
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Pic of the unit up there now. Ready for this weekend.

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