Industrial Durability: Constructed with a die-cast aluminum housing

Is this valve suitable for glycol-based systems

Common Questions & Technical Support: Is this compatible with standard 1/2" NPT pipe

Engineered as a direct OEM replacement

providing the overhead necessary for demanding blower and motor starts

Lennox 25B77 Control Freon Industrial Durability: Constructed with aThe Lennox 25B77 Air Handler Control is a specialized OEM field replacement kit engineered to restore full operational logic to your HVAC system. As a veteran grade air handler control board, this unit serves as the direct Lennox 18Y04 replacement and is also identified by part number 605341 15. Designed for high stakes residential and light commercial environments, the 25B77 manages critical timing, fan relay sequencing, and diagnostic outputs to