Gas Connection - Viessmann Vitodens 222-F Installation Instructions For Contractors

Installing the boiler
Flue gas connection
Do not carry out commissioning until the following
conditions are met:
■ Free passage through the flue gas pipes.
■ Flue system with positive pressure is gas-tight.
■ Apertures for ensuring sufficient combustion air sup-
ply are open and cannot be closed off.
Applicable regulations on installing and commission-
■
ing flue systems have been followed.

Gas connection

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Fig. 8
1. Seal gas shut-off valve
Information on operation with LPG
Install an external safety solenoid valve if the boiler
is installed below ground level.
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 constit-
uents (e.g. nitrides, sulphides) can cause material
damage.
Remove leak detection agent residues after test-
ing.
!
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).
14
(cont.)
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to the gas connection.
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Danger
Leaking or blocked flue systems or an insuffi-
cient supply of combustion air cause life threat-
ening poisoning due to carbon monoxide in the
flue gas.
Ensure the flue system functions correctly. Aper-
tures for combustion air supply must not be able
to be closed off.
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3. Purge the gas line.