Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 56

Installation sequence
Overview of electrical connections
P Only type BW 302.A09,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250,
WW 302.A125, WW 302.A155,
WW 302.A200, WW 302.A250,
WW 302.A300:
Soft starter, compressor 2
R MCB/fuse, power circuit, compres-
sor 1
S Contactor, compressor 1
T Soft starter, compressor 1
Terminal strip for system components
■ Primary pump(s):
On-site connection, see separate
"connection and wiring diagram"
sheet 13.
Factory wiring on main and expansion
PCB (terminals 211.1, 224.2), see
separate "connection and wiring dia-
gram" sheet 20.
56
(cont.)
U MCB/fuse, power circuit, system
components (consumer at terminal
strip D, see separate "Connection
and wiring diagram" sheet 13
"13F2")
V MCB/fuse, control circuit (see sep-
arate "Connection and wiring dia-
gram" sheet 13 "13F6")
W Message and safety connections
(safety chain) with distribution ter-
minal
■ Secondary pump(s):
On-site connection, see separate
"connection and wiring diagram"
sheet 13.
Factory wiring on main and expansion
PCB (terminals 211.2, 224.3), see
separate "connection and wiring dia-
gram" sheet 20.