Bailey 820 Line of controller cards, 6624970A1 Flamon Flicker Receiver.
the Bailey 820 Flamon Flicker Receiver (Part Number: 6624970A1) is a legacy industrial hardware module utilized in burner management and boiler modulation systems. Manufactured under the Bailey Controls brand—which was subsequently absorbed into ABB—this specialized control card intercepts signals from flame detectors to verify the physical presence and stability of a burner flame.