Broad Compatibility: Works natively with Penn A419

When you are out in the field managing a complex furnace repair or optimizing HVAC system performance

ensuring a precise air-to-fuel ratio for natural gas and propane furnace troubleshooting

High-Voltage Stability: Rated for 208/240V operation

The Williams P323096 Fan Switch is factory-set for standard operation within Williams vented units

Source 1 S1-THEC11NS Thermostat Broad Compatibility: Works natively withThe York S1 THEC11NS is a commercial grade, non programmable digital thermostat designed for 1 heat 1 cool configurations in residential and light commercial applications. This low voltage control is engineered for compatibility with conventional single stage gas or electric furnaces, air conditioners, and millivolt heating systems. As a veteran preferred HVAC replacement part, it offers a reliable digital upgrade for older mechanical mercury bulb