the housing must be pre-drilled according to the included technical instructions

Precise Pressure Modulation: Maintains consistent evaporator pressure control to ensure optimal surface temperatures and prevent product dehydration

This specific Lennox limit switch is often identified as 56M1301

and 1/2 inch Watts 009 and LF009 models

Always verify the voltage output of your furnace control board before installation

Fenwal 35-725903-997 Remote Sensor R-410A the housing must be pre-drilledThe Fenwal 35 725903 997 Remote Sensor is a critical diagnostic and flame monitoring component designed for integration with Fenwal series ignition controls, specifically the Mark 10DX 117 and 35 72 series boards. Engineered for high temperature ionization sensing, this probe monitors flame conductivity to ensure safe and reliable furnace operation. Contractors typically deploy this surface mount flame sensor in commercial and residential HVACR