Originally Posted by Celestialsailor
Just back from the boat. Here is how I proceeded. For the convenience of doing measurements from the wires (yellow and green) at the phone jack, I eliminated the jack all together. Next I disconnected the the wires at the thermostat. I checked for continuity. Green wire good. Yellow wire, open. I noticed the yellow connector was covered with longer than normal shrink tube. I cut it open and found a 270 ohm resistor (see attachment). I disconnected the resistor from the wire and had tone back to the jack end. Then checked the resistor...dead!.
Richard...If you're still around, what does this resistor do? Speed control perhaps? I connected everything back up (minus the resistor) and voila...it runs. The box went from 80F to 28 at the freezer in 45 minutes. The first hour cycled on for 7 minutes and off for 5 minutes. After 5 hours it cycled on for 4 minutes and off for 8 minutes. Then the freezer is 22F and box 38F. This was on the #2 setting on the thermostat. I had a couple of warm blue ice packs and some bottled water for load. To me, it is performing well.
Hi, I'm running through a similar project. I had to replace an old AB condenser with the updated model CU200 super cold machine.
The 270 Ohm resistor sets the speed of the compressor. In that case, 2,500 rpm
(the speeds are shown on the second page of this document: http://www.sustainablechoice.net/pdf...ssor_Specs.pdf
In my case, even though my thermostat measures open circuit, things are actually working for me ... though I think that it is probably working at 2,000rpm rather than 3,500 rpm (which would require a 1,500 Ohm resistor) which I think would be better for the cold plate I have.
I can't tell from the "RParts" page whether their thermostats come with a resistor installed or if I'll need to add one myself.
Have you been successful with your project?