Viessmann Vitodens 300 Service Instructions Manual page 28

Initial start-up, inspection, maintenance
Further details regarding the individual steps
System design 4
With/without DHW heating with 3 or more heating circuits with mixer and
low loss header
! Outside temperature sensor
? Flow temperature sensor
% Cylinder temperature sensor
sÖ Heating circuit pump or boiler cir-
cuit pump
sA Cylinder loading pump (connec-
tion via external extension H1)
28
(cont.)
sK Cylinder loading pump (connec-
tion via internal extension H1 or
H2)
fÖ Power supply
gS Mixer motor
A Internal extension H1 or H2
or
External extension H1
B Low loss header