2200600678 is a fan pressure switch that was used on several refrigerated air dryers manufactured by Chicago Pneumatic, Pneumatic and Atlas Copco. The 2200600678 fan pressure switch kicks the fan on depending on the refrigerant setpoint in the air dryer to increase cooling.
This pressure switch may be shown in your parts manual as 2200-6006-78 or 2200 6006 78.
Part #: 1617729900
Part #: 2204213444
Part #: 2200902017
Part #: 2904 5000 69