Viessmann VITODENS 200-W WB2B Service Instructions For Contractors page 106

Designs
Connection and wiring diagram
A3 Optolink
A4 Burner control unit
A5 Programming unit
A6 Coding card
A7 Connection adaptor
A8 LON communication module or
cascade communication mod-
ule
A9 Internal extension (acces-
sories)
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
! Outside temperature sensor
106
external . . .
(cont.)
? Flow temperature sensor, low
loss header
% Cylinder temperature sensor
(plug on the cable harness)
sÖ Boiler circuit pump
dD Flow switch
dG Gas solenoid valve
fÖ Power supply
lH Power supply accessories and
Vitotrol 100
a-Ö Fan motor
a-ÖA Fan motor control
aYA Gas pressure limiter
aVG KM BUS