[Nebster]

Here is a diagram of the Valid-supplied 120V compressor system that is on my coach, and I believe it is also on all newer Newells.

A few things to note, mostly for the next guy who comes along to this thread trying to figure stuff out:

1)  They are still using the same Thomas compressors.

2)  My coach had a plastic air separator, which promptly cracked and failed in our sub-zero temps here.  I replaced it with a metal one, and that is also the one they show in this diagram.  As of today, these are cheapest if ordered directly from SMC.

3)  The dump valve/solenoid is a custom SKU from Spartan Scientific.  I am concerned that mine is malfunctioning in the deep cold, leaving head pressure on the compressor and causing it to stall.  I have not yet called Spartan to figure out what is unique about our special model.

4)  The compressor hour meters inside that metal box are totally standalone from all the digital control logic.  They are just "dumb hour meters," per Valid.  Both of mine are dead, so I am going to try to find a replacement.  It would be nice to know the runtime on these motors.

5)  This diagram doesn't show any of the airlines, but you can see the tee in the front center that lets both pumps to go the cooling coil.  The short plastic lines between the compressors and that tee are the problematic issue in the systems installed in coaches of my era.  Valid says they are using braided lines on new installs of this system.

6)  I am also somewhat skeptical of my pressure transducer.  I think Valid has sourced different transducers over the years, and they have custom firmware in the I/O module that maps the response curve for each model.  This means if you want to replace the transducer, you probably also need Valid to update or swap your controller.

7)  The controller has a 12VDC enable line that, well, enables the system.  Mine has failed -- even if I switch off the "120V Compressor" button up in the galley, the computer still runs the compressors.  (Of course I can turn the whole thing off at the circuit breaker.)  I'm about to tear apart the whole connector and see if I need a new controller or what.  

I am having so many problems with this system right now, it is ludicrous.  I'm close to just ripping the entire thing out and building a whole new one that doesn't use any of the parts that Valid uses, just to see if I can get something that actually works.