Nordyne 626422R Limit Switch a KH12 or similar large-bore

a KH12 or similar large-bore crankarm should be utilized

Key Benefits for Contractors: Direct OEM Compatibility: Verified replacement for HH12ZA189 and HH12ZA189A

and 277V circuits

12-inch probe and 1/2-inch disc for seamless integration into existing control boards

While designed for 1/4-inch diameter probes typical of Johnson Controls series

Nordyne 626422R Limit Switch a KH12 or similar large-boreThe Nordyne 626422R Limit Switch is a critical safety component designed for furnace rollout protection in gas fired and oil fired HVAC systems. This thermal limit switch is engineered to open the circuit at a 155F cut out temperature, immediately interrupting the gas valve circuit if flame rollout or excessive heat is detected near the burner box. As a manual reset rollout switch, it requires a technician to physically inspect the heat exchanger and