Viessmann VITOTRONIC 200 Service Instructions Manual page 304

PCBs and connection options
EEV PCB [2]
For allocation to heat pump type: See "Overview of
PCBs".
A
B
C
D
E
F
G
H
K
L
M
Fig. 74
Air intake temperature sensor (Pt500A)
A
Air discharge temperature sensor (Pt500A)
B
Hot gas temperature sensor (Pt500A)
C
D High pressure sensor
Suction gas temperature sensor (Pt500A)
E
Low pressure sensor
F
Liquid gas temperature sensor 1 (upstream of
G
EEV), (Pt500A)
Liquid gas temperature sensor 2 (downstream of
H
EEV), (Pt500A)
Return temperature sensor, secondary circuit,
K
(Pt500A)
Fan control 0-10 V
L
Slot for jumper, master/slave
M
Jumper not plugged in: Refrigerant circuit in heat
pump 1 (master)
Jumper plugged in: Refrigerant circuit in heat
pump stage 2 (slave)
304
S
R
M
~
Q
P
N
Compressor control
N
Never connect anything here.
P
Q Modbus: Connecting cable to the controller and
sensor PCB, connection X18
Stepper motor EEV (4 or 6-pole)
R
Connection for connecting cable to the inverter
S
Solenoid valve
dÖ
Not allocated
dK
Control of 4-way diverter valve
dL
Internal power supply
fÖ
gJ Demand signal, refrigerant circuit reversal
Internal power supply
aBH
Control of solenoid valve, enhanced vapour injec-
a;Ö
tion (EVI)