Viessmann C3TB, Installation And Service Instructions For Contractors

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2. Check the gas connections for tightness. Also
check the line to the fuel cell module. See page 23.
Note
Use only suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove leak detection agent residues after test-
ing.
!
Please note
Excessive test pressure can damage the
appliance.
Max. test pressure 150 mbar (15 kPa).
Where higher pressure is required for tight-
ness tests, disconnect the appliances from
the gas supply pipe (undo the fitting).
3. Vent the gas line.
Opening the control unit enclosure on the gas condensing module
2x
4x
4.
3.
5.
2.
1.
Fig. 27
Installation sequence
Installing the Vitovalor 300-P
(cont.)
5775 636 GB
Installation