Viessmann VITODENS 222-F Installation And Service Instructions Manual page 13

Installing the boiler
Gas connection
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. Secure gas shut-off valve A at the
gas connection.
(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 constituents (e.g. nitrites, sul-
phides) can lead to material dam-
age.
Remove residues of the leak detect-
ing agent after testing.
Installation sequence
13