Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 111

Repairs
(cont.)
Changing the rotational direction of
the mixer motor (if required)
1. Danger
An electric shock can be
life-threatening.
Before opening the equip-
ment, switch the ON/OFF
switch OFF and disconnect
the mains voltage, for exam-
ple at the fuse or the main
isolator.
2. Remove the lower and upper hous-
ing cover of the extension kit.
Extension kit installation
instructions
3.
Change over the rotational direc-
tion switch.
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the control unit via the LON cable. To test
the connection, carry out a subscriber check at the control unit of the compact
boiler (see page 59).
Troubleshooting
Switch position I for central heating
return from the left (delivered condi-
tion).
Switch position II for central heating
return from the right.
111