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 one heating circuit without mixer A1 with
separate heating circuit pump and one heating circuit with mixer M2
! Outside temperature sensor
? Flow temperature sensor
% Cylinder temperature sensor
sÖ Heating circuit pump
sK Heating circuit pump for one
heating circuit without mixer
(connection via internal exten-
sion)
or
sÖ Heating circuit pump for one
heating circuit without mixer
(connection via external exten-
sion)
Required coding
Function relay of the internal extension: Heating circuit
pump
Operation with natural gas (as delivered condition)
or
28
(cont.)
lH Power supply (extension kit)
aVG KM BUS
A Internal extension H1 or H2
or
External extension H1
B Maximum thermostat (underfloor
heating)
C Extension kit for a heating circuit
with mixer
Address
53:2
82:0