Mixer Extension Kit - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Maintenance
(cont.)

Mixer extension kit

Checking the setting of rotary selector S1
The rotary selector on the PCB of the extension kit
defines the assignment to the relevant heating circuit.
Heating circuit
Heating circuit with mixer M2
(heating circuit 2)
Heating circuit with mixer M3
(heating circuit 3)
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
~
Fig. 67
Check flow temperature sensor
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 68 Sensor type: NTC 10 k
Rotary selector S1
setting
2
4
70 90 110
Ω
Note
The mixer motor can also be started via the actuator
test (see chapter "Checking outputs").
Observe the rotational direction of the mixer motor dur-
ing its self-test.
Then manually set the mixer back to "Open".
The flow temperature sensor must now capture a
higher temperature. If the temperature drops, either
the motor is turning in the wrong direction or the mixer
insert 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, disconnect it from
the mains voltage, e.g. at the fuse or mains
isolator.
2. At plug , swap the cores at terminals "
gS
" ".
~
3. Refit the casing cover.
1. Disconnect plug (flow temperature sensor).
?
2. Check the sensor resistance and compare it to the
curve.
In the event of severe deviation replace the sensor.
Troubleshooting
" and
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97