Gas Connection - Viessmann VITODENS 111-W Technical Manual

Design information
70
Vitodens 111-W
A Reference point Vitodens top edge
B Area for power cables
Recommended leads/cables
2
NYM 3 G 1.5 mm
– Power cables (incl. for accessories)
Interlock switch
Install an interlock for open flue operation if an extractor (e.g. cooker
hood) is fitted in the room providing the combustion air supply.
Power supply for accessories
The power supply for accessories can be provided directly at the
6
control unit.
This connection is switched by the system ON/OFF switch.
If the total system current exceeds 6 A, connect one or more exten-
sions directly to the mains supply via an ON/OFF switch.
Where the boiler is installed in a wet area, the power supply connec-
tion of accessories must not be made at the control unit.

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 into the gas line.
VIESMANN
40
(cont.)
265
2-core min. 0.75 mm
– Outside temperature sensor
– Vitotrol 100, type UTDB
2
4-core 1.5 mm
or
3-core 1.5 mm
wire
– Vitotrol 100, type UTDB-RF
– Vitotrol 100, type UTA
Additional requirements when installing 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.
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. For
this, internal H1 extension is required.
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.
The gas shut-off valves supplied with the Vitodens are equipped with
integral thermally activated safety shut-off valves.
Gas connection line
The following table is designed to assist in the approximate sizing of
the on-site gas supply line.
2
2 without green/yellow
VITODENS