Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 157

Type gc1 digital boiler control unit
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Connection and wiring diagrams
Summary
(cont.)
A2 Main PCB low voltage
A3 Main PCB 230 V~
A6 Programming unit
A7 Optolink/emissions
test switch PCB
A8 Electronics PCB
A9 Boiler coding card
A10 LON communication module
A11 Power supply unit PCB
A12 Boiler control unit
157

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