Dear Brian_UK,
OK 2 True.
1 - But I saw a compressor that works in this shape :
There was a solenoid valve between discharge and suction pipe. Before start this solenoid valve opens route between suction and discharge pipe, Compressor starts and after few second this solenoid valve close this route. This solenoid valve for few second just wants to equalize these two pressures between suction and discharge.
2 – Please find my photo at below, There are some lines that I mentioned with yellow color form SUPCO company catalogue.
Sincerely yours.
Sorry Brian_UK , I thought that you told me item 2 is true !!!! sorry
Attachment 15116