Honeywell ST7800A1104 prepurge timer module 9 min

Honeywell ST7800A1104 plug-in purge timer provides the prepurge timing for the 7800 SERIES Relay Module. Prepurge timing: 9 min Honeywell ST7800A1104 purge timer installation: Before installing Honeywell ST7800A1104 purge timer, disconnect the power to avoid electrical shock and equipment damage. Remove the keyboard display module, dust cover, data bus module, or remote reset module, and pull out the current ST7800A relay module. Ensure the new ST7800A1104 timer card is set to the desired time and insert it into the relay module slot. Reattach all removed modules and restore power. Run the burner through a complete cycle to verify proper operation.