Viessmann Vitoclima 300-S Service Instructions For Contractors page 36

Connection and wiring diagrams
Internal devices
Wall mounted devices, type W303H and W304H
A Connection with external unit
B Control PCB
C Fan
D Room temperature sensor
E Temperature sensor at the heat
exchanger of the internal device
Colour coding to DIN IEC 60757
BK Black
BN Brown
BU Blue
GNYE Green/Yellow
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F Ioniser
G Electrostatic filter
H Stepper motor for air flaps
K On-site time switch (option)
L Display PCB
M Power supply, 230 V~, 50 Hz
GY Grey
RD Red
WH White