Cleveland-Controls-NS2000003-Air-Pressure-Switch

Supco NS2000003 Universal Air Pressure Switch Low cost, high accuracy and reliable universal air pressure switch that replaces many small foot print type switches. Features and Benefits: Senses positive, negative or differential air pressure. Set Point Range: 0.10" to 10" w.c. Electrical Ratings: 1/10 hp at 120 to 277 VAC. 28 VA pilot duty at 24 VAC, 125 VA pilot duty at 120 VAC. Contact Arrangement: SPDT Operating Temperature Range: 40 F (4.4 C) to 190 F (87.8 C). UL and CSA Approved. Common HVACR Applications: On gas fired warm air furnaces, prove fan flow by sensing draft down from blower; switch allows ignition start up or shuts system down upon insufficient draft. Electronic air cleaners and humidifiers can employ sensing switches to prove airflow; switch starts unit with sufficient airflow or draft. Strip heaters employ airflow sensing switches to prove positive pressure/airflow in duct and air movement across heat source; shuts off heat source with insufficient airflow. Exhaust fans and draft hoods employ sensing switches to sense draft down from exhaust fan; switch signals condition upon fan failure or insufficient draft. Refrigeration and cooling coils are maintained by sensing differential pressure/airflow drop across coils; switch signals condition when they ice, or actuates the defrost cycle.