Viessmann VITOSOLIC 200 Installation And Service Instructions Manual page 66

System examples
System example 9
For pump speed, see page 139.
In conjunction with a wall mounted oil/gas boiler
Codes required at the boiler and heating circuit control unit
Code
53:3
5b:1
66
(cont.)
Function
System without DHW circulation pump:
The circulation pump for cylinder heating 4 is connected to
output sK of internal extension H1 or H2
Internal diverter valve without function
(DHW cylinder connected downstream of the low loss
header)