A3 Optolink
A4 Burner control unit
A5 Programming unit
A6 Coding card
A7 Connection adaptor
A8 LON communication module
A9 Internal extension H1
S1 ON/OFF switch
S2 Reset button
! 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
Connection diagram plug 201
dF Jumper or fire protection switch
a-Ö Fan motor
s-A Internal connecting cable (on the
main PCB)
A Oil pump
B Fuel valve 1
C Fuel valve 2
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