Viessmann Vitodens 333-F Service Instructions Manual page 120

Designs
Connection and wiring diagram – external . . .
A3 Optolink
A4 Burner control unit
A5 Programming unit
A6 Coding card
A7 Connection adaptor
A8 LON communication module
A9 Internal extension H1
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
!
Outside temperature sensor
?
Flow temperature sensor, low
loss header
120
(cont.)
%
Cylinder temperature sensor
(plug on the cable harness)
sÖ
Internal circulation pump
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