Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 22

Preparing for installation
Siting
(cont.)
Type BW 302.A150
GFE
A
B
C
D
163
406
A Primary circuit brine inlet:
Victaulic 3"
B Secondary circuit flow:
Victaulic 2½"
C Primary circuit brine outlet:
Victaulic 3"
22
343
1932
D Secondary circuit return:
Victaulic 2½"
E Power supply 400 V/50 Hz
F Power supply 230 V/50 Hz
G Low voltage < 42 V