Wiring Diagram - Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual
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Wiring diagram
Overview
Additional information
A1 Mixing valve extension circuit
board
A2 Low-voltage motherboard
A3 120 V~ motherboard
A4 Electronics board for mixing
valve extension
A6 Programming unit
A7 Optolink/emissions test switch
board
A8 Electronics board
A9 Boiler coding card
A10 LON communication module
(accessory)
A11 Power supply unit board
A12 Boiler control section
135
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