Checking The Fuse - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Checking the fuse

A
Fig. 55
1. Switch OFF the power supply.
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. 56
116
2. Release the side closures and pivot the control unit
F1
3. Remove cover
4. Check fuse F1 (see connection and wiring dia-
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.
Rotary selector S1
Then manually set the mixer back to "Open".
setting
The flow temperature sensor must now capture a
2
higher temperature. If the temperature drops, either
the motor is turning in the wrong direction or the mixer
4
insert is incorrectly fitted.
1. Remove the upper casing cover of the extension
2. At plug
3. Refit the casing cover.
down.
.
A
gram).
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
■ Insert fuses without using any force. Posi-
tion fuses correctly.
Only use structurally identical types with
■
the specified response characteristics.
Mixer installation instructions
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.
, swap the cores at terminals "
gS
" ".
~
" and
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