Resideo AP4508 Pressure Switch 319847-401 9-inch bolt spacing on the

9-inch bolt spacing on the back of the frame

Rotating the adjustment screw allows you to advance or retard the output signal by ±10 psig depending on the specific sequencing needs of your control loop

Key Benefits for Technicians: Proven Mechanical Interlock: High-sensitivity internal air pressure switch ensures the appliance only fires once combustion air flow is established

Rated for 300 psi (21 bar) at 250°F

Resideo AP4508 Pressure Switch 319847-401 9-inch bolt spacing on theThe Resideo AP4508 Pressure Switch is an industrial grade differential air pressure switch designed for precision monitoring in HVAC and pneumatic systems. Engineered with a Single Pole Double Throw (SPDT) switch configuration, this component provides versatile control logic for high limit or proof of flow applications. It features a broad operating range from 0. 17" 0. 05" water column to 5" water column, allowing technicians to fine tune setpoints