Gram External Connections - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Connection and wiring diagram
External connections
Fig.79
A1 Main PCB
A2 Power supply unit
A3 Optolink
A4 Burner control unit
A5 Programming unit
A6 Coding card
A7 Connection adaptor
A8 LON communication module or cascade commu-
nication module
A9 Internal extension (accessories)
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
Outside temperature sensor
!
122
Flow temperature sensor, low loss header
?
Cylinder temperature sensor
%
(plug on the cable harness)
Heating circuit pump or boiler circuit pump
sÖ
Circulation pump, optionally:
sA
DHW circulation pump
■
■ External heating circuit pump
■ Circulation pump for cylinder heating
Gas solenoid valve
dG
Power supply
fÖ
Power supply for accessories and Vitotrol 100
lH
Fan motor
a-Ö
Gas pressure switch
aYA
KM BUS
aVG