Viessmann OpenTherm Installation And Service Instructions For Contractors

26
X21
X12 X22 X3
L
?
NL
?
N L
?
N
?
N
40 20A 20B 52
1 2 3 4 5 6 1 2 3 4
K8
K4
K2
K1
GND
UB
DC
AC
K2
K1
K8
K4
1 nf
100 Ω
1 nf
100 Ω
M
1~
M
1~
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)
fÖ
Power supply 230 V~
gS
Mixer motor
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
X 12.1 - X 12.2 OpenTherm room tem-
perature controller for
heating circuit with
mixer
X 12.3 - X 12.4 OpenTherm room tem-
perature controller for
heating circuit without
mixer
X 12.5 - X 12.6 Flow temperature sen-
sor for heating circuit
with mixer (contact
temperature sensor)
X 21 No function
X 22 No function
Connection and wiring diagram
Connection and wiring diagram
5837721

Viessmann OpenTherm Specifications

General

Brand	Viessmann
Model	OpenTherm
Category	Temperature Controller
Language	English