HOW TO INSURE OIL RETURN TO THE COMPRESSOR WHEN INSTALLING A/C UNITS

The diagram is good and the tip is correct for smaller systems. For some applications, over 5 tons, the pipe size reduced at the evaporator and an auxiliary bypass for the trap may be needed. I had an evaporator installed above the compressor. Plus it was over 100 feet away. Because the distance and the ceiling height the suction and liquid lines ran over the evaporators and into the headers thus making the whole evaporator section a trap. I added and external trap with a bypass of smaller size to encourage oil droplets not a large amount of oil leaving the trap on start up. Just a word that there are exceptions to some piping rules. If in doubt consult then if it seems too easy consult as little more. GOOD tip though some people miss this trap and the tip all together. Then wonder why they have compressors going out every month or 2.