Viessmann VITODENS 333-F WS3A Service Instructions Manual page 90

Troubleshooting
Repairs
(cont.)
2. Change over the rotational direc-
tion switch:
Switch position I for central heating
return from the left (delivered con-
dition).
Switch position II for central heat-
ing return from the right.
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the control unit via the LON connecting
cable. To test the connection, implement a subscriber check at the boiler control
unit (see page 37).
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