Okay I ran it with the electric expansion valve disconnected. When the compressor started, it drew about 16 amps which sounds about right. But it only ran for about 30 seconds and then it shut off and the freeze protection light on the circuit board came on. I ran it through this sequence twice and it did the same thing. I'm not really sure how this freeze protection thing works. There is a T fitting on the suction line that has both the low pressure sensor and the freeze protection sensor on it. Each one is connected to a separate terminal on the circuit board. Attached is a picture of the freeze protection sensor.
I want to check the water flow, but my flow meter is unreadable because of a rust buildup on the inside of it. I'm out of time for now, but tonight I'll take that apart and clean it out and see how the flow is doing.
Does anybody know how this freeze protection sensor operates?