Addresses:
Plewa-Werke GmbH
54662 Speicher/Eifel
Schiedel GmbH & Co.
Hauptverwaltung
Lerchenstraße 9
80995 München
10.8 Sound insulation
The burner/boiler systems, circulation pumps and other drives used in
heating systems generate noise. This noise is transferred from the
installation room via floorboards, ceiling and walls to adjacent rooms
and via the flue system as well as the ventilation air and extract air
apertures into other rooms and into the open,
where it may cause 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.
Attenuating airborne noise
Frequently, modern boilers are equipped with silencer hoods or noise-
attenuated ventilation air inlet housings. Additional silencer hoods may
be used where more stringent anti-noise measures are required.
These measures may be implemented later with minimum effort.
Silencer hoods are offered for various levels of noise attenuation and
are generally designed and built in accordance with specific system
conditions (boiler type, fuel supply, building characteristics).
For larger systems it may be necessary to route the ventilation air
through a sound-insulated channel, in order to avoid excess noise
outside the building.
Flue gas silencers are generally only required where higher noise pro-
tection measures are called for. Whether or not a flue gas silencer is
required can be predicted only with some difficulty, because of the
complexity of the creation and propagation of flame noise, the inter-
action between the burner, boiler and the flue system as well as the
operating mode (flue system operating with positive or negative pres-
sure).
It is advisable, therefore, to assess the noise emission into the neigh-
bourhood in considering the sound power level measured at the flue
system outlet. It should be considered at the planning stage whether
silencers might become necessary later. It is thus important that suf-
ficient space for the flue gas silencer is available 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.
Attenuating structure-borne noise
Anti-vibration supports for the boiler are an economical and effective
measure to reduce vibrations. For this purpose, adjustable anti-vibra-
tion feet for insertion into the boiler base frame and linear anti-vibration
brackets for boilers with higher rated output made from stainless spring
steel are available.
Consider the total operating weight of the boiler system when sizing
such supports. Ensure the support surface is level when using linear
anti-vibration brackets.
Effective anti-vibration measures are 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 pipes. Also insulate any braces or hanging arrange-
ments, if installed, against sound/vibration transmission to the build-
ing.
Detailed information for reducing noise emissions by combustion
equipment in heating systems can be found in the Information Sheet
No. 10 of the BDH (Bundesindustrieverband Deutschland Haus-,
Energie- und Umwelttechnik e.V.).
Noise attenuating accessories
Viessmann offers the following anti-vibration accessories for boilers: ■ Adjustable anti-vibration feet for boilers up to 560 kW
■ Anti-vibration boiler supports for boilers from 300 kW
10.9 Standard values for water quality
The service life of any boiler as well as that of the complete heating
system is influenced by the quality of the water.
In any event, the cost of a water treatment facility is less than the cost
of repairing defects on your heating system.
Maintaining the following requirements is necessary to safeguard your
warranty rights. The manufacturer's warranty excludes damage due to
corrosion and scaling.
The following is a summary of essential water qualities.
A chemical water treatment can be ordered from Viessmann for fill-
ing.
Heating systems with rated operating temperatures up to 100 ºC (VDI 2035)
For heating systems, used water must meet the chemical levels of the
Drinking Water Ordinance [Germany]. If well water or similar is used,
it should be tested for suitability before filling the system.
Design information
(cont.)
44
VIESMANN
OIL/GAS BOILERS
10
5822 426 GB
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