If the circuit remains open while the system is cool and the button is depressed

This beige plastic thermostat cover facilitates precise environmental monitoring and adjustment in commercial HVAC pneumatic control systems

using OEM Lennox replacement parts is essential for preventing soot accumulation

Can I use standard hex nuts instead of the U99-011

Rheem-Ruud 47-25350-09 Limit Switch If the circuit remains openThe Rheem Ruud 47 25350 09 Limit Switch is a critical OEM safety component designed for precise thermal regulation in high efficiency furnace systems. This SPST normally closed switch is engineered to break the electrical circuit when the plenum temperature reaches the 200F fixed open temperature, preventing heat exchanger damage. Once the system cools to the 180F fixed close temperature, the auto reset mechanism restores continuity, ensuring seamless