Viessmann Vitoladens 300-W Service Instructions For Contractors page 92

Designs
Connection and wiring diagram – external...
A3 Optolink
A4 Burner control unit
A5 Programming unit
A6 Coding card
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
Plug 201 connection diagram
dF
Jumper or fire safety switch
a-Ö Fan motor
s-A Internal connecting cable (on the
main PCB)
92
(cont.)
X ... Electrical interfaces
! Outside temperature sensor
? 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 of accessories
s-A Internal connecting cable
A
Oil pump
B Fuel valve 1
C Fuel valve 2