It would also have to pass through the compressor without changing loading of the compressor or input current should change. Liquid going through a compressor is like having a positive displacement pump. But here there is likely still enough gas in the mix to keep it from becoming too extreme compression wise.
Have no idea why the voltage would be a consideration. Again, chasing this on the electrical side is ridiculous. Install the proper sensors and check the refrigeration cycle.
It would change how much current the motor draws. I'll admit I probably don't know enough about this "slugging" and how it may effect loading of the compressor, but I do understand motors and an induction motor motor will change current draw if either the volts, frequency, or driven load changes. this slugging sure sounds like it should change the driven load, even if only slightly for a short time but maybe it is minor enough that it is not easy to measure without more sensitive equipment? Liquids don't compress, but if there is still gas surrounding it then it would just compress that gas to more extent than if there were no liquid within it. I could see this being a lesser issue with a scroll compressor than a piston compressor but it still is likely to increase input power needed to some extent during the time it occurs.
You seem very hung up on your theories. I suggest you go try that out and report back. Tell any HVAC guy that you "confirmed slugging by seeing higher amps on the compressor". They will all get a good laugh. You can't!
As you are probably aware, there are different levels of slugging. Very minor to very major. Sometimes superheat will indicate major concerns, yet there are no noises. Some noises are indeed confirmed from a bad compressor, bad isolators, etc.
I think he was talking about the air side of the coil
No, what you missed in my posts is the word "EVAP", as in evaporator coil. As in the one indoors that you totally ignore, and all techs do too. It is pointless to even attempt to look at it unless it is easy and you know what to look for. Otherwise pressures and temps in the system will tell the story.
I don't think I ever said anything about confirming slugging by seeing higher amps. I certainly did not intend that if I did or was misunderstood. My thoughts on this were that slugging likely should put more load on the compressor and if so should increase amp draw. That is how induction motors work the more torque is being demanded the more input current they draw.
I brought up slugging as only a 'potential' source of noise. However, all I am trying to tell you as someone with countless belt notches in the field, the current of a compressor is DYNAMIC. As in, it's all over the place depending on load conditions, and you cannot begin to 'predict' any level of current as being an indicator of flood back. This is why we use pressure/temp sensors, not an amp meter, to detect the concern.
