Gas Connection - Viessmann VITODENS 222-F Technical Manual

Design information
Additional requirements when siting boilers operated with LPG
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 a registered gas fitter
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 (15 kPa).
We recommend installing a gas filter to DIN 3386 in the gas line.
Thermally activated safety shut-off valve
According to paragraph 4, section 5 of the FeuVo 2008 [or local reg-
ulations], 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 temperature of
650 °C. This is intended to prevent the formation of explosive gas
mixtures in the event of a fire.
Rated heat input Gas type
kW
16.7 Natural gas E
Natural gas LL
LPG
17.9 Natural gas E
Natural gas LL
LPG
24.7 Natural gas E
Natural gas LL
LPG
30.5 Natural gas E
Natural gas LL
LPG
34.9 Natural gas E
Natural gas LL
LPG
Sizing recommendation, gas flow switch
In supply areas with H below 8.6 kWh/m
IB
pliant with category I , determine a fictitious rated heat input. This
2N
fictitious rated heat input results from the rated heat input (Q
the gas appliance, multiplied by a factor of 1.14 (ratio H
Use this fictitious rated heat input to select the gas flow switch and
design the pipework to TRGI 2008 [or local regulations].
Minimum clearances
■ Space required in front of the Vitodens for maintenance:
min. 700 mm
■ No maintenance clearances are required to the left or right of the
Vitodens.
■ In order to ensure a contact-proof design in accordance with the
Low Voltage Directive, install the boiler with its back flush to the
wall.
VITODENS
(cont.)
Connection values
m 3 /h
1.77
2.05
1.89
2.20
2.61
3.04
3.23
3.75
3.86
4.49
3 and gas appliances com-
) of
NB
8.6/7.55).
IB
However, the high safety standard derived from the use of an exter-
nal safety solenoid valve has proved to be valuable. We therefore
recommend the continued installation of an external safety solenoid
valve when installing the Vitodens in rooms below ground level. The
internal H1 extension is required for connection.
The gas shut-off valves supplied with the Vitodens are equipped with
integral thermally activated safety shut-off valves.
Gas supply pipe
The following table is designed to assist in the approximate sizing of
the on-site gas supply pipe.
For each 90° bend 1 m is deducted from the max. possible pipe
length.
Checking your calculations against TRGI and TRF [or local regula-
tions] is recommended.
Nominal diameter of the gas supply
pipe
kg/h DN15
Max. possible pipe length in m
13
8
1.31 80
8
6
1.40 62
6
4
1.93 36
4
–
2.38 23
4
–
2.85 23
Rated heating output
kW
11 to 19
26
35
The sizing recommendation for the gas flow switch does not negate
the requirement for sizing the pipework correctly.
DN20 DN25
60 –
40 127
– –
40 127
28 91
– –
28 91
21 68
156 –
21 68
16 53
100 –
21 68
16 53
100 –
Gas flow switch
For natural gas
GS 4
GS 6
GS 10
VIESMANN
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