Supco AFS-222-121 AIR PRESSURE SENSING SWITCH WITH ADJUSTABLE SET POINT RANGE

Product Description



Supco AFS222121 General Purpose Air Switch
Features / Benefits

 Senses positive, negative or differential air pressure.
 Set Point Range: 0.05" to 12.0" w.c.
 Electrical Ratings: 300 VA pilot duty @115 to 277 VAC, 15 amp non- inductive to 277 VAC, 60 Hz.
 Contact Arrangement: SPDT
 Operating Temperature: -40°F (-40°C) to 180°F (82°C).
 UL & CSA Approved.
 2-year warranty
Common HVAC&R Applications

 On gas fired warm air furnaces, prove fan flow by sensing draft down from blower; switch actuation allows ignition start up or shuts system down upon insufficient draft.
 Electronic air cleaners and humidifiers can employ sensing switches to prove airflow; switch actuation 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 actuation signals condition upon fan failure or insufficient draft.
 Refrigeration and cooling coils are maintained by sensing differential pressure/airflow drop across coils; switch actuation signals condition when they ice, or actuates the defrost cycle.
http://www.unicontrolinc.com/CC%20PDFs/LTAFS222-08.pdf



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