Description
The Honeywell Thermal Solutions ST7800A1070 2.5-Minute Purge Timer is a plug-in timing module designed for use relay modules in combustion control systems. It provides a fixed prepurge interval prior to ignition, allowing air to clear residual gases from the combustion chamber to ensure safe startup in HVAC systems. it is installed in commercial burners, boilers, and industrial heating equipment, it supports proper sequencing of the ignition cycle. Within the control system, this timer plays a vital role in flame safeguard operations by coordinating safe pre-ignition airflow and maintaining accurate system performance.
