Viessmann B1HF Installation And Service Instructions Manual page 16

Installation sequence
Mounting the boiler and making connections
Fig. 6
Note
The diagram shows installation on a pre-plumbing jig
for a gas condensing combi boiler.
The boiler can be installed on the following accesso-
ries:
■ Pre-plumbing jig
■ Mounting frame
■ Plumbing wall mounting frame
16
(cont.)
3 7
2.
3.
1. Replace gaskets.
Internal gasket diameter:
■
■
Note
Gasket for gas connection is attached to the gas
shut-off valve.
3 7
4.
1.
Gas connection Ø 18.5 mm
Connections on the heating water side
Ø 17.0 mm
4x
5.
4x