Viessmann VITOCAL 350-A Installation And Service Instructions Manual page 63

Electrical connections: Heat pump control unit
2
A
aVG
1
X3.10
X3.11
L
223.1
223.2
223.1
223.2
223.1
223.2
N L1
Fig. 58
Heat pump 1 (lead heat pump)
A
KM BUS
B
External extension H1
C
Floating contact "External demand "
D
E Lag heat pump 1
Connection at contact for "External demand "
Floating contact "External demand "
F
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
(cont.)
L1
?
N
Lag heat pump 2
G
Connection at contact for "External demand "
Floating contact "External demand "
H
Lag heat pump 3
K
L Central fault message input, lag heat pump
N/C contact X3.10 / X3.11 triggers a message.
Installation sequence
63