strange compressor behaviour

[Bahaaeldeen]

During testing a window A/C compressor using a run capacitor i discovered that threre are two tubes that discharge and only one for suction ( it is supposed to be one for suction and one for discharge in addition to a process tube which is a suction one ) . the strange thing is that the process tube is not a suction one . The compressor type is L'unite Hermetique .
IF ANY ONE HAS ANY EXPLANATION TO THIS , PLEASE INFORM ME AT ONCE . IT IS VERY IMPORTANT BECAUSE IAM AN A/C INSTRUCTOR AND ASKED BY THE TRAINEE FOR AN EXPLANATION.
bahaah@hotmail.com

[Andy W]

During testing a window A/C compressor using a run capacitor i discovered that threre are two tubes that discharge and only one for suction ( it is supposed to be one for suction and one for discharge in addition to a process tube which is a suction one ) . the strange thing is that the process tube is not a suction one . The compressor type is L'unite Hermetique .
IF ANY ONE HAS ANY EXPLANATION TO THIS , PLEASE INFORM ME AT ONCE . IT IS VERY IMPORTANT BECAUSE IAM AN A/C INSTRUCTOR AND ASKED BY THE TRAINEE FOR AN EXPLANATION.
bahaah@hotmail.com

And you are an instructor? A picture may help.

[NoNickName]

Hot gas bypass?