Description
The Honeywell ST7800C1011 Purge Timing Card is a plug-in timing part used in the burner operation units in HVAC systems. It has a 20-second pre-purge interval, during which combustion air is circulated through the system before ignition is allowed and uses RM7838C. It prevents the removal of fuel vapors and provides airflow conditions for burning. It is installed in heating equipment, boilers, and process burners. It indicates the phase timing to the ignition sequence and overall combustion operation in the system.
