Description
The Johnson Controls P47AA-6 differential pressure control switch is mainly used for steam systems in HVAC systems. It is operable in the temperature range of -20°Fto 150°F. This switch works based on the pressure differential in two points in a steam system usually supply and usage. It has a high limit of 20 –50 PSI and a differential of 0.5–35 PSI. When the pressure differential is below the low setpoint, then the switch opens its electrical contacts and shuts off the boiler to prevent low pressure.
