Vitocal 222-G - Viessmann VITOTRONIC 200 Service Instructions Manual

EEV PCB [4-6] / [4-7]

[4-7]: Vitocal 222-G

V
M
1~
1 2 W
M
U
X
1~
2
1
M
T
1~
2 1
S
N L1
?
230 V/
50 Hz
R
Fig. 79
Never connect anything here.
A
Modbus: Connecting cable to the controller and
B
sensor PCB, terminal X18
C Electronic expansion valve
PWM signal for primary pump
D
PWM signal, secondary pump
E
Low pressure sensor
F
G High pressure sensor
Suction gas temperature sensor (NTC 10 k
H
Primary circuit flow temperature sensor
K
(NTC 10 k )
Ω
Hot gas temperature sensor (NTC 10 k
L
Liquid gas temperature sensor (NTC 10 k
M
Secondary circuit flow temperature sensor
N
(NTC 10 k )
Ω
(cont.)
B
+ -
A
J15 J19
J20
J17
J14
J9
J5
)
Ω
)
Ω
)
Ω
PCBs and connection options
GND
PWM
PWM
GND
PWM
D
C
M
1~
J7 J27
Secondary circuit flow temperature sensor down-
O
stream of instantaneous heating water heater
(NTC 10 k )
Ω
P Secondary circuit return temperature sensor
(NTC 10 k )
Ω
Internal power supply (factory connection)
R
Safety high pressure switch
S
"Central heating/DHW heating" 3-way diverter
T
valve
Primary pump
U
Secondary pump
V
Compressor relay (230 V~)
W
x Enable compressor switching
E
J26
P
F
J10
P
G
ϑ
H
ϑ
K
J13 ϑ
L
ϑ
M
ϑ
N
ϑ
J21
O
ϑ
P
309