Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 230

Connection and wiring diagrams
Overview of the PCBs and connection options
EEV PCB
A B
L N
?
24 V~
S
A Compressor relay
B Mains voltage
C EVI relay
D Defrost
E Modulation compressor
F Manual compressor control (actua-
tor test)
G Defrost control
H KM BUS
K Address jumper, multi-stage sys-
tem
■ Heat pump stage 1 (type BW):
without jumper
■ Heat pump stage 2 (type BWS):
with jumper
230
C D
L N L N
? ?
230 V~
R P
E
L N
?
O N M
L LPG temperature sensor
M Hot gas temperature sensor
N Pressure gas temperature sensor
O Suction gas temperature sensor
P Low pressure sensor
R Stepper motor EEV
S Power supply
(cont.)
F G
L N L N
L K H