Optimized Flow: Large internal diameter minimizes liquid flow velocity and energy-robbing pressure drops

including the 1HP rating and 460V compatibility

Y45AA-1 is identical to Y45AA-1C

which is vital for maintaining the secondary control loop in Lochinvar Knight and A

Designed for seamless natural gas and LP gas compatibility

Lennox 78H74 Limit Switch 320734-701 Optimized Flow: Large internal diameterThe 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