Viessmann VITODENS 200-W Service Instructions Manual page 137

Connection and wiring diagram – external...
A7 Connection adaptor
A8 LON communication module
(Vitotronic 200)
A9 Internal extension H1 or H2
S1 ON/OFF switch
S2 Reset button
X... Electrical interface
! Outside temperature sensor
? Flow temperature sensor, low
loss header
% Cylinder temperature sensor
(gas condensing boiler)
or
Comfort sensor (gas condensing
combi boiler)
(plug on the cable harness)
(cont.)
sÖ
Internal circulation pump
dG Gas solenoid valve
fÖ Power supply [terminals]
lH Power supply accessories and
Vitotrol 100
a-Ö Fan motor
a-Ö A Fan motor control
aYA Gas pressure limiter
aVG KM BUS
Designs
137