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ideal for furnace heat exchanger and airflow sensing
Direct OEM Compatibility: Engineered as the exact replacement for ADFA-20 series pins to maintain system specifications
For technicians performing routine maintenance or a full steam trap repair
the sensor should be open (infinite resistance)
This genuine Johnson Controls replacement part provides the exact tolerances required for industrial and commercial HVAC filtration maintenance
Carrier HH18HA449 Rollout Switch ideal for furnace heat exchangerThe 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
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