Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 109

Connection and wiring diagram
A1 Main PCB
A2 Power supply unit PCB
A3 Supplementary PCB
A4 PCB heating circuit selection
keys
A5 Programming unit
A6 Boiler coding card
A11 Optolink/emissions test
switch PCB
X Electrical interfaces
F1, F2 Fuse
High limit safety cut−out E
F6
110 ºC (100 ºC)
Control thermostat R 75 ºC
F7
(87 ºC, 95 ºC)
K1 K7 Relay
Mains ON/OFF switch 8
S1
S2 Test switch
Emissions test switch S
S3
V1 Fault indicator (red)
V2 ON/OFF indicator (green)
Connection and wiring diagram
(cont.)
Plug 230 V~
sÖ
Heating circuit pump
(accessory)
sA
Cylinder primary pump
(accessory)
sK
DHW circulation pump
(on site)
fÖ
Mains power supply, 50 Hz
fA
Oil/gas burner
(connection to DIN 4791)
gS
Mixer motor (accessory)
X12 External burner start (stage 1)
Low voltage plug
!
Outside temperature sensor
?
Flow temperature sensor
(accessory)
§
Boiler temperature sensor
%
Cylinder temperature sensor
aG
Flue gas temperature sensor
(accessory)
aJ
Return temperature sensor
(accessory)
aVG
KM BUS user
(accessory)
a:A
Two−stage/mod. burner
extension
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