Gas Connection; Minimum Clearances - Viessmann VITODENS 200-W Technical Manual

Design information
(cont.)
Additional requirements when installing boilers with LPG opera-
tion in rooms below ground level
According to TRF 1996 Vol. 2 – valid as of 1 September 1997 – an
external safety solenoid valve is no longer required when installing the
Vitodens below ground level.

Gas connection

Gas installations must only be carried out by an approved gas fitter
[CORGI] who has been authorised by the relevant gas supply utility.
Connect and size the mains gas according to TRGI 2008 or TRF 1996
[or local regulations].
a Connect the mains gas according to ÖVGW-TR Gas (G1) and
the regionally applicable Building Regulations.
Max. test pressure 150 mbar.
We recommend the installation of a gas filter compliant with DIN 3386
into the gas supply line.
Thermally activated safety shut-off valve
According to paragraph 4, sect. 5 of the FeuVo '96 [Germany], ther-
mally activated shut-off equipment, that isolates the gas supply if
external temperatures exceed 100 ºC, must be installed in gas com-
bustion equipment or in gas supply lines. These valves must isolate
the gas supply for at least 30 minutes up to a temperature of 650 ºC.
This should prevent the formation of explosive gas mixtures in the
event of a fire.

Minimum clearances

Maintain a clearance of 700 mm in front of the Vitodens or the DHW
cylinder for maintenance purposes.
VITODENS 200-W
However, the high safety standard derived from the use of an external
safety solenoid valve has proved to be valuable. We therefore recom-
mend the installation of an external safety solenoid valve when instal-
ling the boiler in rooms below ground level. This requires the internal
extension H1.
The gas taps supplied with the Vitodens are equipped with integral
thermally activated safety shut-off valves.
Sizing the gas flow limiter
Rated output range of the
Vitodens
kW
17.0-45.0
17.0-60.0
30.0-80.0
30.0-105.0
Maintenance clearances to the l.h. or r.h. side of the Vitodens are
not required.
Gas flow limiter
for gas type
Natural gas E Natural gas
LL
GS 10 GS 10
GS 16 GS 16
GS 16 GS 16
GS 16 GS 16
VIESMANN
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