Checking The Fuse; Mixer Extension Kit - Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors

Repairs
(cont.)

Checking the fuse

F1
Fig. 99

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.
On all extension kits, check that a consecutive number
is set on rotary switch S1.
Checking the rotational direction of the mixer
motor
After being switched on, the appliance 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
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Fig. 100
1. Switch off the gas condensing module ON/OFF
2. Loosen the side locks and fold down the heat man-
3. Remove cover
4. Check fuse F1 (see connection and wiring dia-
A
Note
The mixer motor can also be started via the actuator
and sensor 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.
1. Remove the top casing cover of the extension kit.
2. At plug
3. Refit the casing cover.
switch: See page 65.
agement unit.
.
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
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 over the cores at terminals "
gS
and " ".
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Troubleshooting
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145