Viessmann Vitocal 350-A Installation And Service Instructions Manual page 223

Safety chain, control circuit, main power...
Power circuit - compressor
K2
K1
95
96
A Compressor power supply
B Phase monitor (see page 112)
C For type AWH-I/AWH-O 120 only:
Compressor contactor K2
M
3~
Connection and wiring diagrams
(cont.)
D Compressor contactor K1 (see
page 217)
E Compressor motor protection (see
page 217)
F Starter
G Compressor
223