Viessmann Vitoclima 300-S Service Instructions For Contractors page 38

Connection and wiring diagrams
Internal devices
(cont.)
Cassette devices, type C303H, C304H and C305H
A Connection with external unit
B Room temperature sensor
C Temperature sensor at the heat
exchanger of the internal device
D Power supply, 230 V~, 50 Hz
E Control PCB
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F Display PCB
G Stepper motor for vertical air flap
H Condensate overflow switch
K Fan
L Transformer