it breaks the circuit to the gas valve as a safety measure while keeping the fan energized to cool the heat exchanger

this limit switch maintains consistent calibration under heavy cycling to prevent system downtime

What symptoms indicate this expansion valve needs replacement

or burner misalignment

eliminating the need for limit switches and reducing mechanical wear

Johnson Controls VA9104-AGA-3S Actuator 324846-701 it breaks the circuit toThe Johnson Controls VA9104 AGA 3S Actuator is a professional grade solution designed for precise control of VG1000 Series ball valves in demanding HVACR environments. Built as a non spring return valve actuator, this unit delivers 35 lb in torque to manage DN15, DN20, and DN25 valves with high reliability. It operates on 24Vac power and supports both two position and floating control protocols. Unlike standard models, the AGA variant is a floating