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Old 06-16-2015, 04:09 PM   #1
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Replacing analog thermostat with digital, have questions

There is a lot of information out there, I'm trying to get opinions from people.

#1 is the wiring of the analog thermostat. The wire colors don't coordinate with traditional residential wiring coloring. Does anyone know what color wires from the Jayco correspond with what function for the thermostat? If it matters, I have a 2015 JayFlight with the 15K ducted AC. I would like the new thermostat to handle AC and furnace. I plan to use the HI FAN setting, am not worried about losing the LOW FAN setting.

#2 I have read concerns that a traditional residential digital thermostat can cause issues with the RV air conditioner. Is there anyone here that has converted to a residential style digital thermostat? A regular digital thermostat can be had for $20, whereas the "RV specific" digital thermostat is around $60.

I appreciate any comments.
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Old 06-16-2015, 04:22 PM   #2
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I read through a lot of various posts regarding replacing the thermostat and came to the conclusion that the extra $40 for the Coleman digital rv thermostat was worth it to not have to fool with hassle of translating to a residential one and a good number had issues when they did. It was worth the extra $$ to not fuss with it and know it would work.
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Old 06-16-2015, 06:17 PM   #3
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I read through a lot of various posts regarding replacing the thermostat and came to the conclusion that the extra $40 for the Coleman digital rv thermostat was worth it to not have to fool with hassle of translating to a residential one and a good number had issues when they did. It was worth the extra $$ to not fuss with it and know it would work.
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Old 06-16-2015, 07:03 PM   #4
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I read through a lot of various posts regarding replacing the thermostat and came to the conclusion that the extra $40 for the Coleman digital rv thermostat was worth it to not have to fool with hassle of translating to a residential one and a good number had issues when they did. It was worth the extra $$ to not fuss with it and know it would work.
Yep, been there done that! Could never get the Lowes thermostat to work properly. So, I purchased the Coleman-Mach digital and wiring was easy and it works great. Spend the bucks...reduce the stress .
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Old 06-16-2015, 07:25 PM   #5
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The home thermostats are made for 24 volts, the RV is made for 12 volts, that's why the Lowes won't work.
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Old 06-16-2015, 08:04 PM   #6
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The home thermostats are made for 24 volts, the RV is made for 12 volts, that's why the Lowes won't work.
You left out 24 volt ac for residential, 12 volt dc for RV's.

If someone is looking for the ability to program, then going digital from a basic unit makes sense to me.

If anyone thinks that digital is better than a properly working analog unit then re-consider your actual needs. As long as the basic analog unit has consistent temperature control it will keep you comfortable.

There is much to be said for a reliable mechanical device in the typical RV which often sits dormant for much of its life. Unless you need program ability a digital readout is just fluff.

All that said, if you need to upgrade, unless you are familiar with HVAC controls, it makes the most sense to stay with products intended for RV units.

FWIW. vic
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Old 06-16-2015, 08:06 PM   #7
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I agree, I have the plans for using one but I already have enough things to do. $40 is a small price to pay to get it done.
I swapped mine out 2 years ago.

15 minutes, color for color.
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Old 06-16-2015, 09:22 PM   #8
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Did the same thing, replaced the Coleman Mach mechanical with the Coleman Mach digital. 15 minute job.
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Old 06-16-2015, 09:48 PM   #9
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Originally Posted by VicS1950 View Post
You left out 24 volt ac for residential, 12 volt dc for RV's.

If someone is looking for the ability to program, then going digital from a basic unit makes sense to me.

If anyone thinks that digital is better than a properly working analog unit then re-consider your actual needs. As long as the basic analog unit has consistent temperature control it will keep you comfortable.

There is much to be said for a reliable mechanical device in the typical RV which often sits dormant for much of its life. Unless you need program ability a digital readout is just fluff.

All that said, if you need to upgrade, unless you are familiar with HVAC controls, it makes the most sense to stay with products intended for RV units.

FWIW. vic
Has nothing to do with programing, in fact the Coleman digital is not programmable. I did the switch to digital for the ability to adjust it a degree at a time. the mechanical did not have great adjustability so we were always adjusting it higher and lower and missing the perfect setting.
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Old 06-16-2015, 09:55 PM   #10
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Did the same thing, replaced the Coleman Mach mechanical with the Coleman Mach digital. 15 minute job.
Spend the extra $$ to get a real easy swap with the Coleman Mach digital. Took me about 15 minutes also but had to install it vertically because I didn't have enough space between the door jamb and the cabinet. Looks pretty funny to see me with my head cocked sideways just to read the thing, but it works great and keeps the temp perfect. Keeps my old neck loosened up too! Lol
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Old 06-16-2015, 09:59 PM   #11
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Anybody have the exact model (black color) for the digital coleman mach replacement? I've seen several different models that look similar with varying P/N. Just want to know which one yall are putting in the Jay Flight.
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Old 06-17-2015, 04:37 AM   #12
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The one I have is p/n 8330-3362. I purchased it from RVplus.com years ago at $61.88.
Google that number and you can find them on ebay too!
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Old 06-17-2015, 08:00 AM   #13
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Originally Posted by drk98 View Post
I read through a lot of various posts regarding replacing the thermostat and came to the conclusion that the extra $40 for the Coleman digital rv thermostat was worth it to not have to fool with hassle of translating to a residential one and a good number had issues when they did. It was worth the extra $$ to not fuss with it and know it would work.
+1 replaced mine with a Coleman Mach digital, never looking back. Easy wire to wire switch, and works perfectly!
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Old 06-17-2015, 08:04 AM   #14
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Has nothing to do with programing, in fact the Coleman digital is not programmable. I did the switch to digital for the ability to adjust it a degree at a time. the mechanical did not have great adjustability so we were always adjusting it higher and lower and missing the perfect setting.
Don't forget the 7 degree temp swing inherent in the mechanical 'stat. That's why I did mine; digital stat only swings about 2 degrees.
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Old 06-17-2015, 10:57 AM   #15
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Don't forget the 7 degree temp swing inherent in the mechanical 'stat. That's why I did mine; digital stat only swings about 2 degrees.
7 degrees is not inherent. A 7 degree swing sounds to me like there was a problem of some sort.

Most all thermostats have an offset adjustment so the swing can be trimmed in. Our 23b has a slider. I needed to adjust mine on the used 23b which we bought. Apparently the previous owner(s) never trimmed it in. Maybe the adjustment was never noticed.

Another problem is that due to corrosion the adjustment contact wiper can lose conductivity over time. That will affect operation. In an RV which gets stored off season it is probably a good idea to move that adjustment occasionally. Just moving it and moving it back to original setting can help the wiper to re-established proper conductivity.

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Old 06-17-2015, 11:59 AM   #16
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The one I have is p/n 8330-3362. I purchased it from RVplus.com years ago at $61.88.
Google that number and you can find them on ebay too!
Thanks Norty. I think the one I need is the 8330-3862, which appears to be same thing, just the black color version (no plug, just wire hook up). Do you by chance have the model of the one you took out?
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Old 06-17-2015, 12:41 PM   #17
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Thanks Norty. I think the one I need is the 8330-3862, which appears to be same thing, just the black color version (no plug, just wire hook up). Do you by chance have the model of the one you took out?
That is the model number I installed last weekend, black digital AC and heat. Exact match wire to wire for the factory Coleman it replaced. Do it one wire at a time since camper wires are not color coded the same as the two thermostats.
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Old 06-17-2015, 12:50 PM   #18
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7 degrees is not inherent. A 7 degree swing sounds to me like there was a problem of some sort.

Most all thermostats have an offset adjustment so the swing can be trimmed in. Our 23b has a slider. I needed to adjust mine on the used 23b which we bought. Apparently the previous owner(s) never trimmed it in. Maybe the adjustment was never noticed.

Another problem is that due to corrosion the adjustment contact wiper can lose conductivity over time. That will affect operation. In an RV which gets stored off season it is probably a good idea to move that adjustment occasionally. Just moving it and moving it back to original setting can help the wiper to re-established proper conductivity.

vic
Did not know that a mechanical stat could be adjusted. Many users cite the temp swing as a reason for switching over to digital. If they can be adjusted, a lot of people (including me) are replacing the mechanical ones unnecessarily.

Oh well, it's done, it was easy, and I'm happy with the results.
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Old 06-17-2015, 01:04 PM   #19
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Our 5th has 2 of the digital Coleman thermo's. The front BR is A/C only. The rear controls A/C and furnace (like the household thermo's).
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Old 06-17-2015, 03:23 PM   #20
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Darn it, not the answer I wanted to hear!!! Well, I appreciate the feedback and guess I understand why I wasn't able to find the info I wanted... it just wouldn't work anyways. I ordered a digital Coleman-Mach off Amazon for $70, should be delivered in time to head to the lake for the 4th of July week.


We were sick of the wide swing in temps... 9 days at the lake alternating between freezing cold and uncomfortable hot was not good enough for the wife. $70 to keep wife and kiddo's comfy is money WELL spent!
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