Is there a strict requirement for the suction line to slope towards the compressor unit? Actually what is the best method of sloping or what is required. My outside unit is 2 ft above the inside a/h and 13 feet away and I would like to know if it is best to drop the 2 ft immediately or slope up and away from the outside unit for the first 13 feet then drop right down to the inside unit and if I require an oil trap which end should it be on/
Thanks very much. I am just checking on my installer.