Checking The Fuse; Mixer Extension Kit - Viessmann Vitodens 222-F Installation And Service Instructions Manual

Maintenance
(cont.)
Fig. 63

Checking the fuse

A
Fig. 64
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.
1. Disconnect the leads from temperature limiter
2. Check continuity of the temperature limiter with a
A
multimeter.
3. Remove faulty temperature limiter.
4. Coat the new temperature limiter with heat con-
ducting paste and install it.
5. After commissioning, press reset button R on the
control unit.
2. Release the side closures and pivot the control unit
F1
down.
3. Remove cover
4. Check fuse F1 (see connection and wiring dia-
gram).
Heating circuit
Heating circuit with mixer M2
(heating circuit 2)
Heating circuit with mixer M3
(heating circuit 3)
.
A
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.
Rotary selector S1
setting
2
4
Troubleshooting
A .
101