Johnson Controls P266AAA-100 Control 320819-301 the SPST switch action is

the SPST switch action is designed to open on temperature rise

ensuring that the compressor is immediately deactivated when pressure exceeds safe limits

maintaining consistent setpoint accuracy within the primary-secondary piping loops common in Weil McLain boiler installations

Whether you are performing a Trane control board upgrade or replacing an aging A19 series thermostat

What does 'NoPP' mean for my installation

Johnson Controls P266AAA-100 Control 320819-301 the SPST switch action isThe Johnson Controls P266AAA 100 is an industrial grade single phase condenser fan speed control designed to maintain stable head pressures in 208 240 Vac refrigeration and air conditioning systems. This pressure actuated digital controller replaces legacy P66 and P215 series units, offering a more robust NEMA 3R weather resistant solution for permanent split capacitor (PSC) motors. With a 8 amp maximum output and featuring 3 high VAC triacs, this