Description
The Reznor 197117 High Altitude Pressure Switch Kit DJ20 adjusts pressure-sensing operation in low-density air conditions at elevated locations. It operates through a calibrated pressure-actuated mechanism that changes electrical contact state based on reduced atmospheric pressure levels. In HVAC systems, it is installed in combustion or airflow monitoring circuits to adapt switching thresholds for high-altitude operation. The kit configuration allows recalibration of pressure response, ensuring correct airflow verification, stable ignition monitoring, and proper altitude compensation that prevents nuisance lockouts from improperly calibrated switches while ensuring adequate combustion air supply that prevents incomplete combustion and carbon monoxide production.
