Viessmann VITOPEND 200 Installation And Service Instructions Manual page 112

Designs
Connection and wiring diagram – internal . . .
§
Boiler water temperature sen-
sor
$
Outlet temperature sensor
%
Comfort sensor
aA
Ionisation electrode
dÖ
Stepper motor for diverter
valve
fJ
Thermocouple
112
(cont.)
gF
Ignition unit
a-Ö
Fan motor for burner
a-ÖA Fan control
aYS
Gas pressure switch
aCA
Air pressure switch
aVL
Flow switch
a:Ö
Modulation coil