Connections On The Gas And The Water Side; H Gas Connections - Viessmann vitodens Technical Manual

2.5 Connections on the gas and the water side

Gas connection
Gas installations must only be carried out
by an approved installer who has been
authorised by the relevant gas supplier.
Connect the mains gas according to
TRGI '86/96 or TRF 1996.
2
Gas supply pipe
The following table is designed to assist
in the approximate sizing of the gas
supply pipe for Vitodens.
Output kW
Gas type
3
Gas supply value m /h
relative to the or
max. load kg/h
Internal diameter of
gas supply pipe
DN 15
DN 20
DN 25
DN 32
Example:
Vitodens 300, 35 kW, natural gas E
Straight pipe length of the gas
supply pipe: 28 m
6 bends 90º
Calculated: Straight length = 34 m
60
Max. test pressure 150 mbar.
We recommend the installation of a gas
filter to DIN 3386 into the gas supply line.
We recommend a final calculation in
accordance with TRGI or TRF .
For the sake of the approximate sizing,
90º bends are calculated as equivalent to
a straight pipe length of 1 m.
12.0 (16.0) 26.0
1.77 2.05 2.65 3.08
1.30
max. possible pipe length in m
13 8 82 6
60 40 28
127 91
Required pipe diameter
(according to table): DN 25
35.0
3.52 4.10
1.94 2.59
4 36 4 23
21 156 21 16 100
68 68 53
Thermal safety shut-off valve
According to paragraph 4, sect. 5 of the
[German] FeuVo '96, thermal shut-off
equipment must be installed in
combustion equipment or in gas supply
lines immediately upstream of the
combustion equipment, which will shut
off the gas supply when the external
temperature exceeds 100 ºC. 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
fires.
The gas shut-off valves supplied with
Vitodens are equipped with integral
thermal safety shut-off valves.
49.0 66.0
4.85 5.64 6.61 7.69
13 9 6
43 30 19
176 121 78
VITODENS
14
60