58
Connecting internal and external unit
Vitocal 222-S, type AWT-AC
221.A04
221.A07
221.A10 and A13
A
B
12V COM
COM 43V
C N L
?
C
12V COM
COM 43V
COM
Ni
?
Li
N
0
L
0
A
C
B
?
?
N L
?
N L
C2 C1
12V COM
COM 43V
A
B
C
A
External unit wiring chamber (see
page 57)
B
BUS cable between the external
and internal units
Recommended cable: 3 x 1.5 mm
2
The cores are
not
interchangeable.
C
AVI PCB in the internal unit (see
page 50)
Note
Route the internal/external unit BUS
cable in the 230 V~ voltage area.
Installation sequence
Electrical connection
(cont.)
5600 950 GB