Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 77

Type awc-i-m, aw-o-m compact heat pump with electric drive, 230 v~
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Electrical connections in the control unit
A PCB 1 (cross connect PCB)
B Blue cores
C Black cores
Opening the control unit
Installation sequence
(cont.)
D Back view of ON/OFF switch
E PCB 2 (motherboard)
F Back view of programming unit
77

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