Viessmann FB2A Installation And Service Instructions For Contractors page 12

Installation sequence
Installing the boiler
DHW circulation connection
DHW circulation connection with
DHW circulation pump connection
set (accessory)
Separate installation instructions
Connections on the solar side
Shown with connection sets for finished walls (accessories)
A Solar return R ¾"
Note
The solar circuit pump is integrated into
the boiler.
12
(cont.)
B Solar flow R ¾"
Install the expansion vessel, available as
an accessory, in the solar return on
site.