Viessmann VITOCAL 242-S Installation And Service Instructions Manual page 53

Electrical connection
Connecting internal and external units
230 V~
Type AWT-AC
241.A04
C N L ?
A
B
12V COM COM 43V
400 V~
Type AWT-AC 241.B10 and B13
C2 C1
N L ? N L3
?
A
B
12V COM COM 43 V
(cont.)
241.A07
Ni
? COM
C
C
12VCOM COM43V
L2L1
C
Installation sequence
241.A10 and A13
Li N L
?
0 0
C2 C1
A
B
12VCOM COM43V
A Wiring chamber, external unit: See
page 52.
B BUS cable between the external
and internal unit
Recommended cable: 3 x 1.5 mm
The cores are not interchangeable.
C AVI PCB in the internal unit: See
page 43.
Note
Route BUS cable for internal/external
unit in the 230 V~ voltage area.
N L ? N L
?
A
B
C
2
53