Trane CNT8121 Control Board 326058-755 The Lennox 11U66 Pressure Switch

The Lennox 11U66 Pressure Switch is a critical safety component designed for precise draft monitoring in high-efficiency gas furnaces and HVAC systems

though the 1-way arrow indicator should be noted for primary flow direction in specific system layouts

restoring the original pressure drop characteristics and combustion air mixture required for peak operational stability in demanding hydronic or domestic hot water applications

It is a direct OEM replacement motor pulley for specific Carrier

Can I use a generic rocker switch instead of the Raypak OEM 006872F

Trane CNT8121 Control Board 326058-755 The Lennox 11U66 Pressure SwitchThe Trane CNT8121 Control Board is a high performance integrated furnace control designed for precise management of heating cycles and blower motor operations. This single stage IFC serves as a direct replacement for various Trane furnace control boards, ensuring seamless integration with existing 24V thermostat wiring and 120V gas valve circuits. As a critical component for maintaining system reliability, the CNT8121 monitors safety limit switches