Viessmann VITODENS 200-W Service Instructions Manual page 136

Designs
Connection and wiring diagram – external...
A7 Connection adaptor
A8 LON communication module or
cascade communication module
A9 Internal extension (accessories)
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
!
Outside temperature sensor
? Flow temperature sensor, low loss
header
% Cylinder temperature sensor
(plug on the cable harness)
136
(cont.)
sÖ Heating circuit pump or boiler cir-
cuit pump
dD Flow switch
dG Gas solenoid valve
fÖ
Power supply [terminals]
lH Power supply accessories and
Vitotrol 100
a-Ö Fan motor
aYA Gas pressure limiter
aVG KM BUS