Trane CNT8121 Control Board 326058-755 The Lennox 11U66 Pressure Switch
Baker’s notes & crumb story
Description
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
Precise Voltage Regulation: Optimized for 20-28VDC systems to ensure consistent valve actuation
Common Contractor Questions: Can the MA40-7173 be used on aluminum damper shafts
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