[Richard]

The compressor logic is 90 to 120 on the engine compressor, 70 to 90 on 120v compressor, and 55 to 70 on 12v compressor. That keeps them from overlapping each other. But 90 psi will NOT lift the back of the coach for leveling which is why the HWH system over rides the well pump switch. If a person desired to keep that feature a better way to do it would be to have the HWH box provide power to a second well pump switch set at a higher pressure.