Viessmann Vitocrossal 200 Installation Instructions For Contractors page 29

Gas connection
(cont.)
3.
Fig. 23
1. Break out the aperture for the gas line at the perfo-
ration in the right or left-hand side panel.
2. Route the gas line through the aperture in the side
panel.
3. Secure the fascia to the inside of the side panel.
4. Connect the gas supply according to TRGI 2008
[or local regulations].
AT: Connect the gas supply according to
ÖVGW-TR Gas 1996 and the regionally appli-
cable building regulations.
CH: Connect the gas supply according to SVGW.
Note
The [German] Combustion Order stipulates that
thermally activated shut-off equipment must be
installed in the gas line.
If the gas line has been contaminated (e.g. old
pipes with corrosion products), we recommend
installing a gas filter in the supply line.
Max. permiss. gas supply pressure 50 mbar
(5 kPa)
Gas connection:
Rated heating output
186 kW
≤
246 kW
≥
2.
1.
Connection
R 1
5. Carry out a tightness test.
!
Please note
Excessive test pressure will damage the
burner and gas train.
Max. test pressure 150 mbar/15 kPa. If a
higher pressure is required for tightness
tests, disconnect the burner and gas train
from the main supply pipe (undo the fitting).
6. Purge the gas line to the outside.
Danger
Escaping gas can lead to explosions which
may result in serious injury.
Never purge the gas line through the boiler
combustion chamber.
R 1
¼
29