Gram External Connection Diagram - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

External connection diagram
Fig. 94
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 (accessories)
A9 Internal H1 or H2 extension (accessories)
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
Outside temperature sensor
!
Connection and wiring diagram
Flow temperature sensor, low loss header
?
Cylinder temperature sensor (plug on cable har-
%
ness)
Internal circulation pump
sÖ
Cylinder loading pump
sA
DHW circulation pump
sK
Gas solenoid valve
dG
fÖ Power supply
Power supply for accessories and Vitotrol 100
lH
Fan motor
a-Ö
A Fan motor control
a-Ö
Gas pressure switch
aYA
KM BUS
aVG
135