What does 'Normally Closed' mean for this 3/4" solenoid valve

For optimal cycle timing and to prevent premature burner shutdown

reducing labor time during device swaps

Standardized Housing: The 48Y frame and 1/2-inch shaft diameter diameter accommodate most standard blower wheels

ensuring stable combustion across all firing rates in demanding hydronic applications

York S1-024-36027-000 Limit Switch 322056-301 What does 'Normally Closed' meanThe York S1 024 36027 000 Limit Switch is a critical high temperature safety control designed for precise thermal management within HVAC furnaces and electric heaters. This genuine OEM replacement part is engineered to open the electrical circuit when the internal plenum temperature reaches its 160 degree Fahrenheit cutout point, effectively preventing heat exchanger damage or unsafe operating conditions. Once the system cools to the 50 degree