Viessmann VITODENS 111-W Installation And Service Instructions Manual page 12

Installation sequence
Fitting the boiler and making connections
12
(cont.)
2. Carry out a tightness test.
Note
For tightness tests, use only
approved leak detection agents
(EN 14291) and devices. Leak detec-
tion agents with unsuitable constitu-
ents (e.g. nitrites, sulphides) can
cause material damage.
Remove residues of the leak detec-
tion agent after testing.
!
Please note
Excessive test pressure may
damage the boiler and the gas
valve.
Max. test pressure 150 mbar.
Where higher pressure is
required for tightness tests,
disconnect the boiler and the
gas valves from the gas sup-
ply pipe (undo the fitting).
3. Vent the gas line.