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Old 06-29-2016, 03:05 PM   #41
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good news...it is running...twisting the green and red together runs the fan on HI...twisting red (+) & white runs fan speed on LO

combine green yellow and red (+) and fan and compressor runs and the ac cools very nicely

the blue wire (-) must go to the ground bus on the charger/converter...now to try the thermostat

we can't run the ac very long because we're doing what we're doing with an 12 ga extension cord, stretched out to the max...when the compressors rests and starts back up, it's flipping the breaker that we have the extension cord plug'd into

thanks again for all the help
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Old 06-29-2016, 04:27 PM   #42
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Sounds good. You're almost there!

FYI: There's not a lot of difference between lo speed and hi speed Some people like them on low because they are a BIT quieter at night. HOWEVER, during hi humidity conditions, there's a greater chance the AC can freeze up if you're running it on the lo speed. There's a sensor that's supposed to shut off the compressor if it starts to freeze up, but some folks have had problems with that sensor shifting or falling off the fins.

SO: If you decide to use the low speed and have any freezing problems, you should go back to high speed and check the sensor position.
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Old 06-29-2016, 06:56 PM   #43
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This is just a thought is the AC grounded the way it's supposed to be.?
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Old 06-29-2016, 08:39 PM   #44
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This is just a thought is the AC grounded the way it's supposed to be.?
Did you read post 41? They got it working.

Or are you addressing the breaker tripping?
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Old 06-29-2016, 08:43 PM   #45
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I missed it, sorry.
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Old 06-30-2016, 06:27 PM   #46
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we got the thermostat on the wall today...we connected it to the HI speed fan...neither of us can tell any difference in noise or air movement between HI and LO fan so, for the reason you stated above we'll leave it on HI until we craft the toggle switch mod

either we didn't give it enough time or it doesn't work on AUTO...turn it to ON and it works, blows and cools as expected...is it just a matter of allowing the t-stat to adjust to the temps before it comes on or is another wire needed on another terminal in the t-stat
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Old 06-30-2016, 11:54 PM   #47
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In AUTO the fan should turn on when the compressor starts and turn off when the compressor stops. So if it runs in ON, but not in AUTO with the compressor, that sounds like a t-stat problem.
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Old 09-18-2016, 12:31 AM   #48
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I had my refrigerator out and the original DuoTherm thermostat was on the other side of the "wall" so I decided this was a good time to replace it.

I purchased the Honeywell Pro 3000 Non-Programmable Digital Thermostat from Amazon. I got that one because it has a back light.

Since I was going to use batteries and would have to pull the face off to replace them I reinforced the wall behind with a furring strip. At this time I am only going to run the A/C on low fan so I will not be adding a switch.

The process went quite easy and the A/C is working perfectly.

I will attach pics later.
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Old 09-18-2016, 11:30 PM   #49
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These are the pics from my previous post...

Pic 1 is the wiring from the old DuoTherm thermostat.
Pic 2 is the new thermostat.
Pic 3 is the insulation board behind the thermostat.
Pic 4 is the wiring of the new thermostat.
W- white Y- yellow G- brown Rc- green (jumped to R)
Note: The red wire is no longer used
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Old 09-20-2016, 10:28 AM   #50
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Quote:
Originally Posted by dea49 View Post
These are the pics from my previous post...

Pic 1 is the wiring from the old DuoTherm thermostat.
Pic 2 is the new thermostat.
Pic 3 is the insulation board behind the thermostat.
Pic 4 is the wiring of the new thermostat.
W- white Y- yellow G- brown Rc- green (jumped to R)
Note: The red wire is no longer used
dea49, thanks for this post. I have the same setup as you on my 2008 FR Surveyor. I purchased the same thermostat and could not get it to work. I thought that I had a faulty thermostat and sent it back to Amazon. The problem for me was that I connected the red (+7.5V) wire to the R terminal on the Honeywell. After putting everything back as originally installed (with the old Dometic analog t-stat), I measured the voltage on all of the terminals. The COOL (yellow), FUR (white) and HI FAN (blue) all had +12 VDC on them which I thought was odd. By connecting the GND (green) (or common) to the R terminal on the Honeywell t-stat, it was basically working in reverse from most systems. Instead of each system (A/C, Furnace, Fan) looking for +12 VDC to power them, the Dometic system is looking for the COMMON since the +12 VDC is already there. I'm going to have to reorder the t-stat from Amazon and try this again now that you have cleared things up for me. I would be interested in adding the HI/LOW fan switch since there is considerable difference between the noise and the air movement between the two on my unit. Have you considered installing this fan switch?
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