Viessmann VITODENS 222-F Installation And Service Instructions Manual page 125

Repairs
(cont.)
Checking the rotational direction of
the mixer motor
After being switched ON, the boiler
implements a self-test. During this, the
mixer is opened and closed again.
Changing the rotational direction of the mixer motor (if required)
gS
|
BU
~
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 boiler control unit (see page 57).
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 tem-
perature drops, either the motor is turn-
ing in the wrong direction or the mixer set
is incorrectly fitted.
Mixer installation instructions
1. Remove the upper casing cover of
the extension kit.
Danger
An electric shock can be life-
threatening.
Before opening the boiler, dis-
connect from the mains volt-
age, for example at the fuse or
the main isolator.
2. At plug gS, swap the cores at termi-
nals "|" and "~".
3. Refit the casing cover.
Troubleshooting
125