Thermally activated safety shut-off valve
According to paragraph 4, section 5 of the FeuVo 2008 [check local
fire regulations], thermally activated shut-off equipment must be
installed in combustion equipment or in gas supply lines immediately
upstream of the combustion equipment. This equipment must shut
off the gas supply if the external temperature exceeds 100 °C. The
valves must isolate the gas supply for at least 30 min up to a temper-
ature of 650 °C. This is intended to prevent the formation of explo-
sive gas mixtures in the event of a fire.
The gas shut-off valves supplied with the Vitodens are equipped with
integral, thermally activated safety shut-off valves.
Gas supply pipe
Calculate the size of the on-site gas supply pipe using the gas sup-
ply values (specification).
Sizing recommendation, gas flow switch
In supply areas with H
IB
below 8.6 kWh/m
3
and gas appliances com-
pliant with category I
2N
, determine a fictitious rated heat input. This
fictitious rated heat input results from the rated heat input (Q
NB
) of
the gas appliance, multiplied by a factor of 1.14 (ratio H
IB
8.6/7.55).
Use this fictitious rated heat input to select the gas flow switch and
design the pipework to TRGI 2018 [or local regulations].
Vitodens rated heating output
Gas flow switch
For natural gas
kW
11 to 19
GS 4
25
GS 6
32
GS 6
The sizing recommendation for the gas flow switch does not negate
the requirement for sizing the pipework correctly.
Minimum clearances
Clearance for maintenance work and operation of ON/OFF switch:
■ In front of the boiler 700 mm
■ To the left or right of the boiler
– Vitodens 200-W and 222-W: No clearance required
– Vitodens 222-F and 242-F: Min. 100 mm for operating the
ON/OFF switch
Installation of the Vitodens 200-W
Accessories required in addition to installation with the pre-plumbing
jig, valves/fittings or mounting frame:
Installation without DHW cylinder: Caps for cylinder flow and return
Installation with DHW cylinder: Connection set for DHW cylinder
Design information
(cont.)
VITODENS
VIESMANN
97
5853906
8
Содержание Vitodens 200-W B2HE
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