Sound Insulation; Appendix; General Information On Low Pressure Hot Water Boilers With Safety Temperatures Of Up To 110 °C - Viessmann VITOFLEX 300-UF Technical Manual

Design information
Observe the following when connecting the flue pipe:
A
ED
C
A Flue gas fan
B Recommended installed location in an optional draught stabil-
iser (chimney draught limiter)
C Recirculation
D Lambda probe with transducer
E Flue gas temperature sensor

9.15 Sound insulation

The fans, circulation pumps and other units used in heating systems
generate noise.
Noise is transferred from the installation room via the floor, ceiling
and walls to neighbouring rooms and via the flue system as well as
the ventilation air and extract air apertures to other rooms and to the
outside.
There it may be considered a nuisance. To avoid this happening,
additional protective measures may be required which should be
considered at the design stage.
Subsequent measures to reduce noise development frequently
require extensive effort and expenditure.
Airborne noise attenuation
To assess the noise emissions to the surrounding area, it is therefore
advisable to consider the sound power level measured at the flue
system terminal. It should be considered at the engineering stage
whether a flue gas silencer will be necessary. It is important to
ensure there will be sufficient space for the flue gas silencer behind
the boiler. In accordance with EN 13384, the pressure drop of the
flue gas silencer on the flue gas side will be required for calculating
the flue system.

Appendix

10.1 General information on low pressure hot water boilers with safety temperatures of
up to 110 °C
The pressure vessel (hot water boiler) is built in accordance with
TRD 702 and must be equipped in line with this directive. Observe
the operating conditions in this directive. Depending on type, the
boiler meets the following standards regarding the stated rated heat-
ing output and technical requirements:
VITOFLEX 300-UF
(cont.)
B
Note
The flue gas design (dimensions) is matched to the relevant project
at the factory.
■ Install the flue pipe with a rise to the chimney (45° if possible).
■ Never push the flue pipe too far into the chimney.
■ Ensure the entire flue gas path (including cleaning aperture) is
gas-tight.
■ Do not brick the flue pipe into the chimney; connect it with a flexi-
ble flue pipe inlet instead. Provide a cleaning aperture.
■ Use wall liners to adapt to flue systems from other manufacturers.
■ Provide the flue pipe with thermal insulation of at least 30 mm
thickness.
Structure-borne noise attenuation
Anti-vibration supports for the heat generator are an economical and
effective measure. We therefore offer anti-vibration supports for this
purpose. When sizing such supports, take the entire operating
weight of the boiler system into consideration and, when using linear
anti-vibration brackets, the condition of the supporting surface. Effec-
tive structure-borne noise attenuation is particularly important when
installing boilers in attics. Compensators may be used to physically
separate the combustion equipment from the building. These should
be installed as near as possible to the boiler in the flow, return and
safety line. Also insulate any braces or brackets, if installed, against
sound/vibration transmission to the building. Detailed information for
reducing noise emissions from combustion equipment in heating
systems can be found in Information Sheet No. 10 of the BDH (Fed-
eration of German Heating Industry).
■ DIN 4702 or EN 303
■ EN 297
■ EN 483
■ EN 677
See details on the type plate and in the enclosed documentation.
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Viesmann
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