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Old 05-27-2018, 04:36 PM   #1
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Digital Thermostat

Rockwood Mini-Lite 2503s...Replaced stock Coleman-Mach analog thermostat with digital of the same make. Easy install and works beautifully!
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Old 05-27-2018, 09:20 PM   #2
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I did the same thing last year. Much better ac control, making it easer to sleep in. Jay
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Old 05-28-2018, 01:35 PM   #3
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definitely a great mod! i just wish it had a backlight when you change the temp in the dark.
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Old 05-28-2018, 02:32 PM   #4
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definitely a great mod! i just wish it had a backlight when you change the temp in the dark.
If you can find a backlit battery operated T-stat, you can install one of those. (A non-battery model probably runs on 24VDC, not 12VDC; but if you find one that runs on 12VDC, go for it.) It probably won't have a 2-speed fan switch, but you can add that yourself, too.

I used a Honeywell RTH111, but it isn't backlit. Home Depot has a Honeywell RTH2300B that's backlit and programmable, and an RTH5100B non-programmable.

See attached for wiring details, and a potential "RV" rocker switch to use for the fan speed.
Attached Files
File Type: pdf Thermostsat wiring with internal switches.pdf (194.6 KB, 23 views)
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
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Old 05-30-2018, 07:16 AM   #5
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Normal (home) thermostats run on 24vac (ac, not dc).

Lux makes a battery powered wifi thermostat that I (one day) hope to use.
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Old 05-30-2018, 09:23 AM   #6
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In the pop up world, the analog thermostats were terrible. Maybe they still are, but I haven't looked. The ones in the 2010 and earlier models were pretty bad. One common mod was to use a Hunter 42999 thermostat. It's cheap ($20-25), battery operated, and it fit really well in the stock location. At one point, Hunter discontinued and it was replaced by Supco 43054. I think the Supco has backlight.

Anyway, in pop-ups, it was generally preferred not to require line power from 12VDC. In fact, I'm not even sure that 12VDC was available at those super simple analog thermostats. In any case, those battery powered thermostats are good options if that's the direction you want to go. It obviously prevents you from accidentally discharging your 12V battery, since it isn't connected and the circuit is broken when you remove the AA batteries.

For my TT, replacing the thermostat was one of the first things I did. $52 from RVupgrades.com. I went with the Coleman, because it was a 1 for 1 replacement and I didn't have to customize for the fan speed. It was as easy as this video makes it look:

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Old 05-30-2018, 09:57 AM   #7
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Normal (home) thermostats run on 24vac (ac, not dc).

Lux makes a battery powered wifi thermostat that I (one day) hope to use.
Yeah, my fingers worked faster than my brain.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
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Old 05-30-2018, 09:59 AM   #8
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Anyway, in pop-ups, it was generally preferred not to require line power from 12VDC. In fact, I'm not even sure that 12VDC was available at those super simple analog thermostats. In any case, those battery powered thermostats are good options if that's the direction you want to go. It obviously prevents you from accidentally discharging your 12V battery, since it isn't connected and the circuit is broken when you remove the AA batteries.
These old t-stats were/are basically bimetallic switches. I believe they simply switched a 12VDC signal from/to the furnace on and off. That being said, they didn't "need" a "power supply" since they were simply switches; they had no "brains" that needed to be powered.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)

2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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