Description
The Honeywell ST7800A1120 Purge Timer Card is a control accessory designed to provide a fixed 15-minute interval in burner management HVAC systems. It is used with relay modules, where it regulates the timing of airflow before ignition to clear residual gases from the combustion chamber. Installed within the control module, it ensures proper sequencing during startup in boilers and industrial heating equipment. This component plays a essiental role in system safety and operational accuracy by supporting controlled purge cycles, supports maintain compliant ignition procedures and stable combustion performance in commercial applications.
