GeneralAire 12500 Fan Sensing Switch

 

• 12500 / 7021 GeneralAire Fan Sensing Switch
  
• For installation on any forced air heating and cooling system
• The Air Pressure Switch is designed to control Humidifier operation by sensing changes in air pressure within the furnace plenums when the furnace is in operation.
• The Air Pressure Switch can be actuated by a positive pressure, negative pressure or a differential pressure of .05″ W C or more.
• The Air Pressure Switch contains normally open single throw contacts to supply 120V A C to the humidifier or humidifier transformer when the furnace blower runs.

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