Honeywell Thermal Solutions ST7800A1021 10-Second Purge Timer

The Honeywell ST7800A1021 is a 10-second purge timer compatible with the series relay modules in HVAC systems. This plug-in module achieves an accurate 10-second pre-purge cycle before ignition, which enables the safe evacuation of unburned fuel vapors from the combustion chamber. it solid state electronics and small size make it easy to install and operate in different HVAC applications. By eliminating possible ignition dangers it elevates burner safety, increases combustion effectiveness, and increases equipment longevity. It is applicable for residential and commercial HVAC systems.