Rheem-Ruud 47-21900-01K Limit Switch If you detect air escaping

If you detect air escaping from the actuator vent hole or if the actuator fails to stroke properly under normal supply pressure

it initiates a circuit break if temperatures exceed the factory-defined threshold

Its robust aluminum construction resists common corrosive elements found in gas streams

Persistent tripping is typically caused by insufficient combustion air

Rheem-Ruud 47-21900-01K Limit Switch If you detect air escapingThe Rheem Ruud 47 21900 01K Limit Switch is a critical OEM replacement part designed for technicians managing residential and commercial heating cycles. This high limit safety control features a 230F cut out temperature, engineered to provide positive circuit interruption in the event of an over temperature condition within the flanged airstream. As a Manual Reset device, it ensures that your furnace or water heater remains offline for inspection if