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it functions as a primary fail-safe by interrupting the electrical circuit (typically 20 amps at 120/240 VAC) when the temperature exceeds safety thresholds
the internal diaphragm or mechanical seat may be stuck
helping ensure proper airflow
it is rated for steam service up to 281°F (138°C)
Bard HVAC 8402-084BX Limit Switch L99H008 it functions as a primaryThe Bard HVAC 8402 084BX Limit Switch is a critical safety component engineered for precision temperature monitoring in Bard wall mount units and heat pumps. This L130 30 automatic reset limit switch is designed to open the electrical circuit if internal temperatures exceed 130F and automatically close once the system cools by 30F, preventing heat exchanger damage and ensuring safe operational cycles. As a direct OEM Bard replacement part, the 8402
