Honeywell Air pressure switch C6065F1050U

The Honeywell C6065F1050U is a differential pressure switch from the C6065F series. It has an adjustable set point and an SPDT contact. This switch is used in boiler and ventilation automation systems to monitor the pressure of air or non-aggressive gases. Typical applications include fan operation confirmation, filter clogging detection, and gas pressure control. The adjustable SPDT contact enables both alarm circuits and direct actuator control.

Parts of this type are selected by the medium (air or gas), the required switching range and differential, the connection type (hose spigot or threaded), the contact rating, and the applicable approval class. When replacing such a switch, ensure the impulse tube is clear and the diaphragm is intact. The setpoint must be verified against the burner manufacturer's specification.

A torn diaphragm, a blocked impulse tube, or a drifted setpoint are common failure modes for this type of switch. These prevent the switch from proving airflow, which often leads to burner lockouts that may be mistaken for ignition problems. A drifted setpoint can also cause premature lockout or unsafe operation.