Viessmann FB2A Installation And Service Instructions For Contractors page 11

Installing the boiler
Connections on the heating water and the DHW side
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
(cont.)
D Cold water R ½"
E Heating return R ¾"
Installation sequence
11