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.