Viessmann Vitodens 333 Service Instructions Manual page 87

Repairs
(cont.)
Extension kit for heating circuit with mixer
Checking the rotational direction of
the mixer motor
1.
Switch 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)
Then standard control mode
resumes.
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 sense 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
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 OFF the ON/
OFF switch and mains vol-
tage, for example 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.
Toggle rotational direction switch
B.
Troubleshooting
87