Viessmann Vitodens 333 Service Instructions Manual page 88

Troubleshooting
Repairs
(cont.)
Extension kit for heating circuit with mixer
Checking the rotational direction of
the mixer motor
1.
Switch the ON/OFF switch A at
the extension kit first OFF and then
ON again. The device will carry out
the following self-test:
&
Mixer "Close" (150 s)
&
Pump "ON" (10 s)
&
Mixer "Open" (10 s)
&
Mixer "Close" (10 s)
Standard control mode then recom-
mences.
2. Observe 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 falls, either the
motor is turning in the wrong direc-
tion or the mixer set is incorrectly
fitted.
Mixer installation instruc-
tions
88
Changing the rotational direction of
the mixer motor (if required)
1. Danger
An electric shock can be
life-threatening.
When opening the equip-
ment, switch OFF the ON/
OFF switch and mains vol-
tage, for example at the fuse
or the mains isolator.
2. Remove the lower and upper hous-
ing cover of the extension kit.
Extension kit installation
instructions
3.
A ON/OFF switch
B Rotational direction switch
Change the rotational direction
switch: