jpsmith1cm yes they are. I did the piston blow by test by putting a gauge on the CC and one on the suction port. I slowly closed the suction service valve and watch my gauges. They both fall at the same rate down to 0 PSI at which point I know I do not have an over pressurized CC. I guess it's possible to have an intermittent flood but haven't seen one. My rooftop condenser has 3 fans with one controlled by a fan cycle switch. The unit also has a 3-way head pressure control valve.