Viessmann VITODENS 111-W Installation And Service Instructions Manual page 17

Mounting the boiler and making the connections
Installation sequence
2. Carry out a tightness test.
Note
Only use suitable and approved leak
detection agents (EN 14291) and
devices for the tightness test. Leak
detection agents with unsuitable con-
stituents (e.g. nitrides, sulphides) can
cause material damage.
Remove leak detection agent resi-
dues after testing.
!
Please note
Excessive test pressure will
damage the boiler and the gas
train.
Max. test pressure 150 mbar
(15 kPa). If a higher pressure
is required for tightness tests,
disconnect the boiler and the
gas train from the main supply
pipe (undo the fitting).
3. Purge the gas line.
(cont.)
17