How Do I Adjust the Hitachi Condor MDR-21 Pressure Switch?

Locate the small metal plate on the front of the Hitachi Condor pressure switch. Two screws in the plate control the pressure of the compressor.

Turn the small screw on the top of the metal plate on the Hitachi pressure switch to adjust the cut in pressure. This is the pressure that turns the compressor on. Turn the screw clockwise to decrease the cut in pressure and counterclockwise to increase the pressure.

Loosen or tighten the small screw on the bottom of the metal plate to adjust the cut out pressure. This is the pressure that turns off the compressor. Turn the screw clockwise to increase the cut out pressure and counterclockwise to decrease the cut out pressure.