Viessmann FB2B Installation And Service Instructions Manual page 14

Installation sequence
Installing the boiler
Gas connection
Shown with connection sets for finished walls (accessories)
A Gas connection R ½
Notes regarding operation with LPG.
We recommend the installation of an
external safety solenoid valve when
installing the boiler in rooms below
ground level.
1. Fix gas shut-off valve to gas connec-
tion A.
14
(cont.)
2. Carry out a tightness test.
Note
For the tightness test, use only suita-
ble and approved leak detecting
agents (EN 14291) and devices.
Leak detecting agents with unsuita-
ble contents (e.g. nitrides, sulphides)
can lead to material damage.
Remove residues of the leak detect-
ing agent after testing.