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Old 12-31-2014, 11:27 PM   #1
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Thermostat swap from Duotherm

I made it this far, but it does not work. The two extra wire: one is orange, which is for low fan speed(I m not using this yet) and the brown is a ground. I don't know where or if to attach the brown wire.

The second photo is the old thermostat.

On the old thermostat the wires were attached as follows:

7.5-red/cool-yellow/furnace-white/high fan-blue/low fan-orange/ground-brown

Thanks,eh?

Brad
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Old 12-31-2014, 11:39 PM   #2
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what did you take out ?
what are you putting in ?
Thanks
Dan.
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Old 12-31-2014, 11:55 PM   #3
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TX500E Smart Temp Programmable Thermostat is what I m trying to install.

The one I m replacing is a DuoTherm analog with the sliding temperature adjuster.
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Old 01-01-2015, 07:03 AM   #4
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A house system is 24 volt is a Rv system the same.
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Old 01-01-2015, 11:35 AM   #5
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Is the blue wire on the new thermostat connected to the G connection correct?

I would think G = Ground.....
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Old 01-01-2015, 11:46 AM   #6
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Where was the old one grounded? One of the wires should have been a ground on that one too. The picture shows it.

Ground wire should be, well, grounded, meaning the negative pole of a DC circuit. In an RV or other vehicle, the chassis is connected to the battery negative and serves as the system-wide ground.
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Old 01-01-2015, 12:04 PM   #7
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The brown wire is the ground, but this schematic from the new 'stat shows that the fan should be hooked to the "G" terminal.
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Old 01-01-2015, 12:20 PM   #8
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Old 01-01-2015, 01:24 PM   #9
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I rehooked the old 'stat last night before going to bed. Before I did, I insulated around where the wires come thru the wall.

The temperature control improved vastly.

It's been getting down in the 20'sF the last three nights. Night before last all of our exposed hose between the faucet and the RV froze solid! I spent 5 hours yesterday completing the insulating of the water hose I should have done when the weather was warm! Luckily, I have a heater on a thermostat in the wet compartment that kicks on and off. I also shoved old towels around where the water and macerator hoses come up into the compartment.

I had to take all of the frozen water hose down (two 25' lengths), put it in the covered bed of my pickup with 3 space heaters to thaw it out before reinstalling and insulating. The total distance from outside faucet to RV (as the hose is routed..lots of corners and such) is aboot 125 feet.
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Old 01-01-2015, 03:03 PM   #10
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After a bit of searching, I found this. Now I know where that brown ground wire goes. I omitted the hot, because the stat runs on batteries, and used the hot terminal as a ground. Works like a charm!
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Old 01-01-2015, 03:14 PM   #11
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The new stat you are installing is a 24 volt AC unit and you have 12 volt DC in your RV. I don't see how it will work. You need a 12 volt DC or a battery operated stat. JM2C
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Old 01-01-2015, 08:24 PM   #12
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Quote:
Originally Posted by waroland View Post
The new stat you are installing is a 24 volt AC unit and you have 12 volt DC in your RV. I don't see how it will work. You need a 12 volt DC or a battery operated stat. JM2C
That's what I said in post #4 I've been wrong before.
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Old 01-01-2015, 09:38 PM   #13
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Woroland is right, that new stat is 24vac. Since thermostats are only switches, you can make it work but only with battery power. Those terminals are as follows.
RC- 24 volt cooling
RH- 24 volt heating
Y- cooling relay
W- heating relay
G- fan relay
C- 24 volt common
O and B are used to energize the reversing valve on residential heat pump units, neither of these would be used in your application. You loose the ability to have 2 speeds for the fan with this thermostat
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Old 01-01-2015, 09:40 PM   #14
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Woroland is right, that new stat is 24vac. Since thermostats are only switches, you can make it work but only with battery power. Those terminals are as follows.
RC- 24 volt cooling
RH- 24 volt heating
Y- cooling relay
W- heating relay
G- fan relay
C- 24 volt common
O and B are used to energize the reversing valve on residential heat pump units, neither of these would be used in your application. You loose the ability to have 2 speeds for the fan with this thermostat
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