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Old 06-23-2015, 11:36 PM   #11
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Not sure what an RTHL111B is. I googled it but couldn't really find a description.

I just installed a RTH111 this weekend. It's a non-programable, battery powered T-stat that is designed for a single fan speed. However, I installed a small single pole double throw (SPDT) switch to allow me to pick the fan speed (high or low). I'm attaching pics and a wiring diagram showing the Coleman Mach wiring and the RTH111 wiring.

In the 1st pic, on the right, I had cut out the two pieces of plastic in the "vent" (you can see them in the vent on the far right). However, I ended up having to also cut out plastic all the way to the end of the Electric/gas switch opening to allow the wiring to fit. If you don't want fan speed control, just pick high or low and wire it's wire to the G connection.

Basically:

- Red is power (+12VDC) - feeds the next 4 colors listed below when the T-stat says to; also powers the T-stat if not battery powered.
- White is to the furnace
- Yellow is to the AC
- Gray is the AC fan low speed
- Green is the AC fan high speed
- Blue is ground. If your T-stat is battery powered, you don't need this. If you T-stat is not battery powered, you will need this. (But if it's a 24VDC T-stat, you're in trouble.)

The SPDT switch is very small and I suspect it's not too reliable. I may end up installing a larger rocker switch in the wall next to the T-stat instead. We'll see how well the little guy holds up.
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File Type: pdf Thermostsat wiring.pdf (114.2 KB, 29 views)
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Old 06-24-2015, 12:12 AM   #12
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nicely done. the dpdt switch should be heavy enough...the load is light. the yellow is the compressor basically. staying with the battery sounds safest. if its not programmable, whats the advantage over the stock thermostat?
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Old 06-24-2015, 03:06 PM   #13
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Wrong photo's

I will try the photo thing again.
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Old 06-24-2015, 07:45 PM   #14
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Quote:
if its not programmable, whats the advantage over the stock thermostat?
The stock one isn't digital, it's analog of some kind. The old Suburban's were bimetallic. Not sure what/how the Coleman Mach works, it's got a slide thing on it.

Digital holds the temperature setpoint better. Plus it reads out the temperature digitally.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
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2016 Mini Lite 2503S - tt (2015 - ???)
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Old 06-24-2015, 08:20 PM   #15
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ok...the coleman on auto should run on high till it gets close to temp and then automatically switch to a quieter low speed, at least thats dometics function. thats a nice caveat. i dont know what you might be sacrificing with your move to the new control.
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Old 06-24-2015, 08:31 PM   #16
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Quote:
ok...the coleman on auto should run on high till it gets close to temp and then automatically switch to a quieter low speed, at least thats dometics function. thats a nice caveat. i dont know what you might be sacrificing with your move to the new control.
I got no operating manual with the Coleman Mach, but I haven't found anything on the web that says it will switch to a quieter speed close to the setpoint. There's actually very little difference between the fan speeds, you can hardly tell the difference.
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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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Old 06-24-2015, 09:42 PM   #17
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sounds like nothing lost then....good deal.
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Old 06-24-2015, 10:11 PM   #18
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Honeywell Thermostat

Here's a diagram that I drew and used. Only drawback is the batteries power the unit, not the 24 volts that a residential home supplies, thus when the batteries go then your system doesn't work. However I can go through a whole season on the batteries in the unit
Hope this helps and I hope I uploaded it correctly!
Ronzo
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Old 06-24-2015, 10:45 PM   #19
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Since the batteries will last longer than the season, I don't see it as a drawback.
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2016 Mini Lite 2503S - tt (2015 - ???)
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2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
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Old 06-25-2015, 06:45 AM   #20
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Honeywell thermostat

I had mentioned using the batteries as a power source being a drawback for the instalation of a digital thermostat. I meant that for information purposes only and should have used "other wording". Realisticly I have found no drawbacks doing this install and have used this procedure on my past 3 units,
Thanks
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