The Lennox Y0393 is a specialized 24V UVC power supply ballast engineered to provide stable

preventing pressure switch trips and combustion cycle failures in high-demand environments

Precision Fit: Specifically sized for 1-1/2 inch round flanges found on Laars Pennant and Mascot series boilers

For safety and to ensure the HVAC defrost control is functioning correctly

or a complete failure of the inducer to spin up during the pre-purge cycle

Resideo L4029E1029 Control R-410A The Lennox Y0393 is aThe Resideo L4029E1029 provides critical high limit protection for ductwork and warm air systems. This manual reset limit control is engineered with a normally closed SPST switch that breaks the circuit upon temperature rise, specifically calibrated with a fixed 200F high limit stop. This 120V 240V compatible control serves as a dedicated fire thermostat, detecting excessive heat in HVAC ducts and immediately shutting down the fan to prevent the