Description
The Honeywell ST7800A1112 Purge Timer Card provides a fixed prepurge timing operates of 12 minutes for burner control sequences. It is designed for use with 7800 Series relay modules, operating within standard control voltage circuits to ensure proper sequencing before ignition in HVAC systems. Installed in burner management systems for boilers and furnaces, it controls the purge cycle to clear residual gases from the combustion chamber. As part of the safety and control assembly, it supports proper startup conditions, enhances combustion safety, and contributes to reliable system operation.
