Viessmann Vitoladens 300-W Service Instructions For Contractors page 77

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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Troubleshooting
Repairs
(cont.)
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the control unit via the LON system. To test the
connection, carry out a subscriber check at the boiler control unit (see page 32).
77

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