Viessmann Vitocal 350-A Installation And Service Instructions Manual page 102

Installation sequence
Electrical connections in the heat pump control...
3X2.25
A
3X1.25
1X3.10
1X3.11
L
N L1
A Heat pump 1 (lead appliance)
B KM BUS
C External extension H1
D Zero volt contact "Ext. demand"
E Heat pump 2 (lag appliance)
Connection at the contact for "Ext.
demand"
102
D
2X7.13
E
2X7.12
F
2X7.13
G
2X7.12
H
2X7.13
K
2X7.12
C
3
2
B
1
aVG
N
230 V
?
L
sA
L
?
N
fÖ
N
230 V
?
L
sK
N
230 V
?
L
sÖ
F Zero volt contact "Ext. demand"
G Heat pump 3 (lag appliance)
Connection at the contact for "Ext.
demand"
H Zero volt contact "Ext. demand"
K Heat pump 4 (lag appliance)
(cont.)
L1
?
N