The BCU 370 burner control unit controls, ignites and monitors industrial forced draught burners of unlimited capacity in intermittent or continuous operation. It can be used for directly ignited forced draught burners or forced draught burn- ers ignited with pilot burner. The BCU 370 activates the blower and sets the connected butterﬂy valve to pre-purging and ignition position. After pre-purge and burner start, the Enable signal is issued to an external controller which positions the butterﬂy valve in accordance with the output demand. Post-purge occurs after the end of burner operation. The burner control unit BCU 370 monitors the gas and air pressure. An optionally integrated tightness control func- tion checks the valves with an external gas pressure switch. Programmability by means of the optical interface and BCSoft PC software guaran- tees optimum adaptation to the relevant ap- plication. Adjustable start-up attempts and automatic restart which can be activated ensure the high availability of the burner equipment. The quick-start option allows standard-com- pliant start-up of the forced draught burner without pre-purge after normal shutdown. This avoids unnecessary admission of air into the combustion chamber. The heat output is available as quickly as possible after a temperature demand. The program status, the unit parameters and the level of the ﬂame signal can be read di- rectly from the unit. An integrated Manual mode allows manual start of the burner and setting of the butterﬂy valve position inde- pendently of the central control system. The BCSoft operator-control and setting soft- ware provides a powerful tool for start-up and servicing. To reduce the installation and wiring costs Kromschröder offers an optional Proﬁbus-DP interface to transfer the activation signals and feedbacks.