Viessmann VITODENS 222-F Installation And Service Instructions Manual page 131

External connection diagram
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
% Cylinder temperature sensor
(plug on the cable harness)
(cont.)
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
Designs
131