Wiring Schematic Diagrams | Bosch .
1 = Number of unmixed heating circuits. 1 = Number of mixed heating circuits; These diagrams are also the same for the 4322 control. Control Schematics; 010 Volt Volt Free 4321 Saftey Chain with alarm 4321 Saftey Group File Type; PDF PDF PDF PDF PDF PDF PDF PDF PDF PDF Download; .