Viessmann VITODENs 200 Installation Instructions Manual page 128

Designs
Connection and wiring diagrams – external connectio . . .
A3 Optolink
A4 Burner control unit
A5 Operating interface
A6 Coding card
A7 Connection adaptor
A8 LON communication module
S1 ON/OFF switch
S2 Reset button
!
Outside temperature sensor
?
Flow temperature sensor low
loss header
112
%
Cylinder temperature sensor
sÖ
Internal circulation pump
dG
Gas solenoid valve
fÖ
Power supply
lH
Mains power supply - acces-
sories and Vitotrol 100
a-Ö Fan motor
aYA Gas governor
aVG KM BUS
(cont.)