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The rugged diaphragm construction provides reliable HVAC part replacement performance in demanding mechanical rooms
ensuring compatibility with aggressive refrigerants and secondary coolants
please note these model numbers are identical and provide the same general-purpose liquid level monitoring functionality
Technicians typically identify failure through an open circuit reading on a multimeter
Legacy Compatibility: Easily replaces older KMC CTE-1004 units
Carrier HH18HA202 Rollout Switch 321142-301 The rugged diaphragm construction providesThe Carrier HH18HA202 Rollout Switch is a critical safety component designed for gas fired furnaces and heating systems. Engineered as a manual reset limit switch, this SPST (Single Pole Single Throw) device is calibrated to open the circuit at a fixed 350 degrees F. When excessive heat is detectedtypically indicating a flame rollout condition or heat exchanger breachthe switch interrupts the 24V control circuit to shut down the gas valve immediately.