Carrier HH18HA449 Rollout Switch Ease of Installation: Standard 2-wire

Ease of Installation: Standard 2-wire 10k ohm design allows for rapid field replacement during routine maintenance or emergency HVAC repair

this thermistor ensures the unit maintains accurate setpoints by monitoring the air entering the evaporator coil

is a high-performance white port cartridge specifically engineered for thermostatic expansion valves (TEV)

The deep-seated threads and consistent hex sizing allow for proper torque application

For technicians performing routine maintenance or a full steam trap repair

Carrier HH18HA449 Rollout Switch Ease of Installation: Standard 2-wireThe Carrier HH18HA449 Rollout Switch is a critical safety component designed to detect and respond to flame rollout conditions in gas fired furnaces. This genuine OEM part serves as the advanced replacement for the obsolete HH18HA350, ensuring full compatibility with a wide range of Carrier, Bryant, and Payne heating systems. Engineered as a Single Pole, Single Throw (SPST) switch, it features a factory calibrated trip point of 350 degrees F. When the