Viessmann FB2B Installation And Service Instructions Manual page 12

Installation sequence
Installing the boiler
Connections on the heating water and the DHW side
A B
E
D
C
B
A
Shown with connection sets for finished walls (accessories)
A Heating flow R ¾
B DHW R ½
C DHW circulation R ½ (separate
accessory)
Fitting the drain outlet and drain line
to the T&P valve
Separate installation instructions
12
(cont.)
C D E
D Cold water R ½
E Heating return R ¾
DHW circulation connection
DHW circulation connection with
DHW circulation pump connection
set (accessory)
A
B
C
D
E
Separate installation instructions