racerzl1
Mississippi
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Hello again. I am wanting to replace my analog thermostat with the digital one. I know to get a hunter t-stat(the kind with batteries) from Walmart, but I have questions on the wiring.
What I have is a dometic a/c unit, not sure of furnace brand.
It has the duotherm analog t-stat.
My wiring is what I have questions about.
Heres the way mine is wired.
+7.5= Red , cool=yellow , furnace=white , high fan=blue , fan=orange , ground=green.
I am headed camping this weekend and would really like to install a new thermostat,But, I don't want to mess anything up. I really would appreciate if one of you nice people would tell me how to wire this.
I saw another diagram showing power is 12v, but mine is apparently +7.5v.
My old analog thermostat ,I believe,is bad anyway, as the fan never shuts off,even when in auto mode .
Thanks in advance for any insight on this.
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I am still wayne_tw
everywhere
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I made that upgrade and not very happy with it. I find the old analog works just as good as the digital and the old provided for two fan speeds for the A/C and the digitl does not. Keep what you got.
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garym114
Bluff Dale, Texas
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The power and ground are not used. Tape over the red power.
The thermostat you use has to be battery powered, like two AA batteries.
Wire up one fan speed to use exclusively or put in a switch to select either speed.
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stump_breaker
Great State of Texas
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Super easy and as mentioned above, wire nut your power and ground.
Be sure your AC stays grounded just not through the thermostat. Took me 20 minutes of sweating to figure out why my AC wouldn't come on before I realized I had disconnected my ground completely.
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Fire Instructor
Upstate (Albany) NY Area
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Complete instructions here.
Or here.
Or here! (This is the set that I used when I made the same modification.
It's really an easy mod, so just read-up about it and go for it!
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racerzl1
Mississippi
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So, am I correct in thinking that I need to hook up the low fan to the orange, and take a jumper from there to the switch, and from switch to blue wire ,high fan?
So, If I don't have the switch right now, i can just hook the high and low fan wires together, attach to (orange)fan on t-stat and I will have just high fan,correct?
Or am I thinking wrong?
Thanks guys.
Fire Instructor wrote:Complete instructions here.
Or here.
Or here! (This is the set that I used when I made the same modification.
It's really an easy mod, so just read-up about it and go for it!
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RedG
Fort Worth Texas
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No, don't hook the high and low fan wires together. Just pick one (high if that's what you want). I bought a mini slide switch at Radio Shack and put it on my Tstat. Works great.
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racerzl1
Mississippi
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Red, Where does the switch connect, if I choose to go that route ?
RedG wrote:No, don't hook the high and low fan wires together. Just pick one (high if that's what you want). I bought a mini slide switch at Radio Shack and put it on my Tstat. Works great.
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garym114
Bluff Dale, Texas
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racerzl1 wrote:Red, Where does the switch connect, if I choose to go that route ?
The switch connects to the G on the hunter tstat.
The one marked relay to the thermostat, the ones each end to the hi and low fan wires coming out of the wall.
Ignore the labeling of the wires in the image.
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RedG
Fort Worth Texas
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Looking at the switch above, the fan wire from the tstat would go to the center terminal with the orange wire on one side and the blue wire on the other.
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