Cleveland Controls AFS-275-206 Pressure Switch

The Cleveland Controls AFS-275-206 Pressure Switch measures air pressure differentials across the combustion air or venting circuit and opens the electrical contact when pressure falls outside the accepted operating range, signaling the control board to prevent or interrupt burner operation. A diaphragm element responds to pressure variations by actuating the internal switch mechanism at the factory-calibrated setpoint in HVAC systems, ensuring the burner fires only when adequate airflow conditions are confirmed. Placed within the flue gas or combustion air pathway of forced-draft and induced-draft furnaces and boilers, it connects directly to the pressure port through a sensing tube without requiring more complicated wiring alterations.