Opening The Control Unit; Plugging In The Boiler Coding Card - Viessmann Vitotronic 300 GW6B Installation Instructions Manual

Weather-compensated boiler and heating circuit control unit in single boiler or multi boiler systems
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Vitotronic 300, GW6B Installation and Service

Opening the Control Unit

Plugging in the Boiler Coding Card

Only use the boiler coding card supplied with the boiler
junction box.
Insert the boiler coding card into slot "X7", through the
recess in the cover.
Coding card #
Part #
1042
7543216
Electrical Connections
27

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