The suction line should be the insulated and big line. The discharge lines are small and not insulated and the process line is short and it's cut off and seal.
The top line should be the suction line and the bottom line is the discharge.
A rotary compressor has motor on top of the compressor and the rotor on the bottom of the compressor. That what the picture said!
I could tell you better by seen a picture of your rotary compressor.
