Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 89

Electrical connections in the heat pump control...
Cascade control via KM BUS
Make connections at external extension
H1 only in accordance with the following
diagram.
2
A
aVG
1
X3.10
X3.11
L
223.1
223.2
223.1
223.2
223.1
223.2
N L1
A Heat pump 1 (lead appliance)
C
3
2
B
1
aVG
N
D
230V
?
L
sA
L
?
N
E
fÖ
N
F
230V
?
L
sK
G
N
H
230V
?
L
sÖ
K
B KM BUS
Installation sequence
(cont.)
L1
?
N
89