Connection And Wiring Diagram - Viessmann OpenTherm Installation And Service Instructions For Contractors

Connection and wiring diagram

Connection and wiring diagram
GND UB
DC
AC
K4
L?N N L
?
40 20A
M
1~
Plug 230 V~
sÖ A Heating circuit pump for heating
circuit without mixer (on site)
sÖ B Heating circuit pump for heating
circuit with mixer (on site)
Power supply 230 V~
fÖ
Mixer motor
gS
LV connections
X 3.1 - X 3.2 Flow temperature sen-
sor for heating circuit
without mixer (immer-
sion temperature sen-
sor)
X 3.3 - X 3.4 OpenTherm connec-
tion, heat generator
26
K2
K1
K8 K1 K2
N L N
? ?
20B 52
M
1~
M
1~
K8
K4
1 2 3 4 5 6
X21
X 12.1 - X 12.2 OpenTherm room tem-
X 12.3 - X 12.4 OpenTherm room tem-
X 12.5 - X 12.6 Flow temperature sen-
X 21 No function
X 22 No function
1 2 3 4
X12 X22 X3
perature controller for
heating circuit with
mixer
perature controller for
heating circuit without
mixer
sor for heating circuit
with mixer (contact
temperature sensor)