Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 130

Designs
Connection and wiring diagram – External...
A7 Connection adaptor
A8 LON communication module
A9 Internal extension H3
S1 ON/OFF switch
S2 Reset button
A Fan
B Oil pump
C Fuel valve stage 1
D Fuel valve stage 2
X ... Electrical interfaces
! Outside temperature sensor
Plug 201 connection diagram
dF Jumper or fire safety switch
a-Ö Fan motor
s-A Internal connecting cable (on the
main PCB)
130
(cont.)
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Flow temperature sensor, low loss
header
% Cylinder temperature sensor
sÖ Internal circulation pump
fÖ Power supply
aXA Oil preheater
aXF Flame monitor
aVG KM BUS
aBH Power supply for accessories
s-A Internal connecting cable
A Oil pump
B Fuel valve 1
C Fuel valve 2