Siemens Combustion QRA4M.U Scanner L99H008 Contractor-Grade Durability: Constructed to withstand

Contractor-Grade Durability: Constructed to withstand the constant thermal cycling and high-heat environments of commercial water heating applications

Common Questions What are the symptoms of a failing 100208550 high limit sensor

Key Benefits Maximum Heat Dissipation: Precision-molded cogs allow for cooler operation and extended service life compared to wrapped belts

If the board receives the microamp signal but fails to keep the main valve energized

Remember to recalibrate the calibration screw in the center of the gas cock plug if the housing is repositioned

Siemens Combustion QRA4M.U Scanner L99H008 Contractor-Grade Durability: Constructed to withstandThe Siemens Combustion QRA4M. U is a high sensitivity UV flame scanner engineered for the rigorous supervision of gas or oil flames and ignition spark proving in intermittent burner operations. As a veteran grade flame detector, this sensor utilizes a specialized UV sensitive cell with two electrodes designed to ignite upon detecting radiation within the 190 to 270 nm spectral range. This ignition triggers the necessary current in the flame detector