Im more curious about having the expansion valve in the outdoor unit in split a/c?
It is more effiecient if it was on the indoor unit. (more subcooling and no vapourization of liquid in the luid line due to bad insulations)
Can any one tell me the genuine reason?
My opinion is that the static pressure drops in the vertical piping may result in flash gas and beacause of that they did this. Is it correct???