Viessmann Vitoladens 300-W Service Instructions For Contractors page 90

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit

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Table of Contents

Designs

Connection and wiring diagram – internal connections

X ...

Electrical interfaces

Boiler water temperature sensor

Flue gas temperature sensor

dÖ

Stepper motor for diverter valve

Temperature limiter

Ignition unit

a-Ö

Fan

a-ÖA Fan control

aCA

Air pressure switch

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Vp3b