Viessmann Vitocal 300-G Installation And Service Instructions Manual page 120

Troubleshooting
Repairs
(cont.)
Type BWS 301.A
G
F
E
D
B
A
A Transformer EEV PCB
B EEV PCB (electronic expansion
valve)
C Phase monitor
D Compressor contactor
E Thermal relay
F Cable channel
G Full wave soft starter
H Programming unit
120
N
Q
R
K Controller and sensor PCB
L Main PCB
M Extension PCB on main PCB
N Compressor power supply
O Cross connect PCB
Q Plug for connecting cable stage 1/2,
low voltage < 42 V
R Plug for connecting cable stage 1/2
230 V~