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ZBKN is the replacement control panel for BK1200, BK1800, and BK2200. ZBKN is standard issue on BKS1200, BKS1800 and BKS2200. The original ZBK control panel was identified by a line of 20 DIP switches. It is no longer available. The new ZBKN has three 7 segment displays and a menu system to make settings. The connectors are largely the same, so it is a direct replacement. There are many  new feature enabled on this new panel.