Viessmann VITODENS 100-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 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. nitrites, sulphides)
can result in material losses.
Remove residues of the leak detect-
ing 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,
separate the boiler and the
gas valves from the gas sup-
ply pipe (undo the fitting).
3. Vent the gas line.