Siemens Combustion QRA4M.U Scanner 323055-751 This furnace high limit switch

This furnace high limit switch (cross-reference 208W32) provides the reliable thermal protection required to prevent heat exchanger damage and maintain optimal airflow safety across various York HVAC units

The E3SRMM facilitates a daisy-chain or remote mount configuration

With an 8 1/4" O

and furnace configurations

Siemens Combustion QRA4M.U Scanner 323055-751 This furnace high limit switchThe 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