Viessmann Vitocal 300-G Installation And Service Instructions Manual page 86

Compact heat pump with electric drive type bw/bwc, ww/wwc
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Installation sequence
Connection of electrical components
A Heat pump 1 (lead appliance)
B KM BUS
C External extension H1
D Zero volt contact
E Heat pump 2 (lag appliance)
86
(cont.)
F Zero volt contact
G Heat pump 3 (lag appliance)
H Zero volt contact
K Heat pump 4 (lag appliance)

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