including the 1HP rating and 460V compatibility

Y45AA-1 is identical to Y45AA-1C

or delayed ignition sounds caused by a sticking solenoid

Key Benefits Precise Timing Logic: Features an factory-set 2-second activation delay and 45-second fan-off delay to maximize airflow efficiency

Lennox 78H74 Limit Switch 320734-701 including the 1HP rating andThe Lennox 78H74 is a critical OEM L185F limit switch designed for precision thermal protection in residential and commercial Lennox heating systems. As a primary safety control, this high limit switch monitors internal heat exchanger temperatures and is engineered to open the electrical circuit if the ambient temperature reaches the L185F set point. This rapid response prevents internal overheating and ensures the system operates within safe HVAC