Viessmann FB2A Installation And Service Instructions For Contractors page 123

External connection diagram
A7 Connection adaptor
A8 LON communication module
A9 Internal extension H1
S1 ON/OFF switch
S2 Reset button
X... Electrical interfaces
A KM BUS to the solar control mod-
ule
B Solar control module power sup-
ply
! Outside temperature sensor
? Flow temperature sensor, low
loss header
(cont.)
% Cylinder temperature sensor
(plug on the cable harness)
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
123