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Old 10-29-2021, 10:25 AM   #1
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Digital thermostat

I tried using the search function but it isn't robust enough to do any good.

I would like to convert my Duo-Therm by Dometic analog thermostat to a digital. See the attached picture.

It is used to control a SF35Q suburban furnace and one single stage AC.

There are multiple options available. I don't know which will work as a direct replacemane. I don't need any gadgets/gimmicks. Just a simple thermostat will do.

Any suggestions?
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Old 10-29-2021, 11:10 AM   #2
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We've been very happy with our MicroAir EasyTouch digital wifi/bluetooth thermostat. Here's a video of the installation on our Outdoors RV 280KVS ....

https://youtu.be/0TxgjUTPz1c
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Old 10-29-2021, 11:34 AM   #3
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Swap out that old analog T-stat for a simple Digital T-stat
Honeywell non-programable ----uses 2AA batteries for display

Straight forward wire swap and Digital controls to within 1*F swing

Old analog wiring


New digital wiring





https://www.supplyhouse.com/Honeywel...lay-Thermostat



FAN SPEED:
Digital only has One Terminal for fan....analog has Two (Hi/Lo)
You can just use the HI Speed (Blue wire)
*LO fan is rarely used

OR you can add a small toggle switch with Blue & Brown to switch then wire from switch to Fan terminal

I swapped analog to digital back in 2008 and only connected Hi Fan...never missed Lo Fan use
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Old 10-31-2021, 08:11 AM   #4
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Thanks Old-Biscuit. I have one ordered. I'll post here once it is installed.
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Old 10-31-2021, 05:19 PM   #5
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I did much the same thing using a Honeywell Focuspro 5000 series thermostat (bigger display numbers) about 4 years ago, I also was able to add a hi/lo toggle switch mounted to the side of the thermostat, looks almost like it belongs there.
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Old 11-28-2021, 08:47 AM   #6
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Digital thermostat temperature differential

Well I finally had the time to install my digital thermostat.

I had two reasons for wanting to change. The most obvious is that the sliding scale on the Dometic analogue thermostat provided little accuracy and was a guesstamate at best of the temperature setting.

In addition the Dometic was mounted in a place that the freezer door on the refrigerator occasionally hit one of the switches on the the thermostat and broke it off!

I bought this THERMOSTAT from Amazon. It is not a Honeywell but it claimed to be narrower and might fit on the wall in the same location without getting hit by the freezer door. Alas, it was not to be. The door hit it too.

I relocated the thermostat rearward about 12". I covered the holes in the paneling with a nice picture.

Connections are as Old_Biscuit says. Thanks. I wired it so that Hi speed is the only one connected. No Hi/Lo for me anymore!

I set the temperature differential at 1F. I'm uncertain if this is a good value. Any guidance would be appreciated.
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Old 11-28-2021, 09:47 AM   #7
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1F differential may cause rapid cycling of the furnace and air conditioner, try it and see if it causes problems.
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Old 11-28-2021, 10:03 AM   #8
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I tried a MicroAir Easy Touch and returned it. The touch screen is too quirky and difficult to operate. It is a nice concept but needs some refinements.

Ken
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Old 11-28-2021, 10:37 AM   #9
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The furnace guy that installed my casita system told me a minimum of 4 separation ( like 70 heat 74 cool ) was recommended. I have no idea if that applies to the rv auto change thermostat s but it make sense to me.
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Old 11-28-2021, 11:58 AM   #10
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As others have said, I think you will experience a lot of cycling back and forth with only 1-degree separation. Our central system at home is factory-set for 3-degree separation.
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Old 11-28-2021, 02:33 PM   #11
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I installed a Honeywell Digital back in 2008
2*F spread......

EX: set point 72*F
T-stat Opens at 73*F and Closes at 71*F

House Digital has same spread

Neither cycle excessive. YMMV
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Old 11-29-2021, 08:52 AM   #12
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Thanks everyone. I like the idea of a smaller temperature swing. The old analog thermostat's differential was so large that you got cold before the furnace kicked in and then got hot before it kicked out. Or the opposite with the A/C.

I'm sure I will prefer a tighter differential than the old thermostat...but just how tight is the question! Because this thermostat is controlling one of the A/C and the furnace there might be a compromise related to the differences between cooling and heating.

I think I will leave the setting at 1 F for now and monitor it as we go. The MH is put away for the winter. I won't get a chance to see how well it works until next spring. I live in Colorado and camp a 9000' most of the time so the furnace gets used even in the summer.

Again thanks for all the responses. It's nice to have such a knowledge base to call on!
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