Viessmann VITODENS 333-F WS3A Service Instructions Manual page 89

Repairs
(cont.)
Then standard control mode
resumes.
Changing the rotational direction of the mixer motor (if required)
Danger
An electric shock can be life-threatening.
Before opening the equipment, switch OFF the ON/OFF switch and
mains voltage, for example at the fuse or the main isolator.
A ON/OFF switch
B Rotational direction switch
2. Note the rotational direction of the
mixer motor during its self-test.
Then set the mixer manually to
"Open" again.
Note
The flow temperature sensor must
now capture a higher temperature.
If the temperature drops, either the
motor is turning in the wrong direc-
tion or the mixer set is incorrectly
fitted.
Mixer installation instruc-
tions
1. Remove the lower and upper hous-
ing cover of the extension kit.
Extension kit installation
instructions
Troubleshooting
89