Viessmann Vitodens 300 Service Instructions Manual page 25

Further details regarding the individual steps
Required coding
Function relay of the internal extension: Cylinder loading
pump
System design 2
With/without DHW heating with 1 heating circuit with mixer and system
separation
!
Outside temperature sensor
?
Flow temperature sensor
%
Cylinder temperature sensor
sÖ
Heating circuit pump
sA
Cylinder loading pump (connec-
tion via external extension H1)
sK
Cylinder loading pump (connec-
tion via internal extension H1 or
H2)
lH
Power supply
aVG KM BUS
Initial start-up, inspection, maintenance
(cont.)
Address
A
Internal extension H1 or H2
or
External extension H1
B
Extension kit for 1 heating circuit
with mixer
C
Maximum temperature controller
(underfloor heating)
D
Heating circuit pump (sec-
ondary)
E
Heating circuit pump (primary)
F
Heat exchanger for system
separation
G
Expansion vessel
53:3
25