We’ve got a Trane Chiller, Model #RTAA1854XT01A0C0F, I believe it’s 185 tons, air cooled condenser, with two separate circuits, circuit #1 is 100 tons, and circuit #2 is 85 tons. The problem we are having is circuit #1 will run for appx 30 sec. and cut out, the code we are getting is 194(Low Evap Rfgt Temp-Crtct 1). We are suspecting that the electronic expansion valve is not operating correctly because when circuit #2 starts the valve opens right before the compressor starts, however, circuit #1 does not; the compressor starts and the low side immediately pulls down to 10 inches of vacuum and cuts out. Head pressure remained constant at 150psi. Does anyone have any ideas as to what we should test, what kind of voltage should we read at the EXV? Would a bad sensor cause the EXV to not open? Hopefully Trane will come out and look at this Monday or Tuesday, but in the mean time, circuit #2 just can’t keep up with the load. Any help or ideas would be appreciated.