Mixer Motor, Part No. 7450 657 - Viessmann Vitoligno 300-C Installation And Service Instructions For Contractors

Maintenance
Extension kit for heating circuit with mixer
Curve
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 43

Mixer motor, part no. 7450 657

Checking the rotational direction, mixer for return
temperature raising facility
Lever position A with "Open boiler valve" display at
the control unit. See actuator test, page 35.
Fig. 44
Checking the rotational direction, mixer for heating circuit
The mixer is opened and closed using the control unit
actuator test (see page 35).
Note the rotational direction of the mixer motor during
the actuator test.
Note
The flow temperature sensor must now capture a
higher temperature. If the temperature drops, the
motor is turning in the wrong direction or the mixer
insert is incorrectly fitted.
Mixer extension kit installation instructions
78
A
(cont.)
Changing the rotational direction of the mixer
motor (if required)
1. Remove the upper casing cover of the extension
kit.
Danger
An electric shock can be life-threatening.
Before opening the boiler, disconnect from
the mains voltage, e.g. at the fuse or mains
isolator.