Neutralising system
C
B
A
A
Condensate drain
B
Neutralising system
C
Ventilation via the roof
The Vitodens can (if required) be supplied with a separate neutralis-
ing system (accessories, see page 69). Any condensate is piped to
and processed in the neutralising system.
The condensate drain pipe to the sewer connection must be accessi-
ble for inspection. Install it with a fall and a stench trap on the sewer
side, and provide a suitable facility for extracting samples.
Install a condensate lifting pump if the Vitodens has been installed
below the waste water anti-flooding level.
Condensate lifting pumps are available as accessories.
Since the consumption of neutralising granulate depends on the
operating mode of the system, carry out regular checks during the
first year of operation to determine the required top-up volume. One
fill can last longer than one year.
Condensate removal pump (accessories)
C
A
B
A
Condensate inlet
B
Condensate removal pump
C
Condensate drain
8.5 Hydraulic connection
General
System design
Viessmann condensing boilers can generally be installed in any fully
pumped hot water heating system (sealed unvented system).
The circulation pump is an integral part of the appliance.
Minimum system pressure 1.0 bar (0.1 MPa).
The boiler water temperature is limited to 82 °C.
To minimise distribution losses, we recommend sizing the heat distri-
bution system to a max. flow temperature of 70 °C.
Due to the immediate capture of the room influence factors, we rec-
ommend using the Vitodens in conjunction with the Vitotrol 200-E for
apartments with less than 80 m
2
living space or for low energy
houses with a low heat demand.
The heat generator must be correctly sized and selected.
Chemical anti-corrosion agents
According to VDI guideline 2035, the design of heating systems
must ensure they are sealed against corrosion. Additives in the heat-
ing water (additives, chemicals) as corrosion protection measures
are normally not necessary.
Exception: In systems without system separation, for example, addi-
tives can be considered.
Heating circuits
For heating systems with plastic pipes, we recommend the use of
impermeable pipes to prevent the diffusion of oxygen through the
pipe walls.
Provide system separation in heating systems with plastic pipes that
are permeable to oxygen (DIN 4726). A separate heat exchanger for
this purpose is available.
Install a dirt separator in underfloor heating systems. See
Viessmann Vitoset pricelist.
Underfloor heating systems and heating circuits with very large
water content (>15 l/kW) should be connected to the condensing
boiler via a 3-way mixer. See technical guide "Control of underfloor
heating systems" or the relevant sample applications.
Install a temperature limiter in the flow of the underfloor heating cir-
cuit to restrict the maximum temperature. Observe the requirements
of DIN 18560-2 [or local regulations].
Plastic pipework for radiators
We also recommend the use of a temperature limiter to restrict the
maximum temperature for plastic pipework in heating circuits with
radiators.
Attic heating centre
The installation of a low water indicator, compulsory according to the
DVGW [Germany], is not required when installing boilers in an attic
heating centre.
The boilers are protected against water shortage in accordance with
EN 12828.
Safety valve
A safety valve in accordance with TRD 721 is integrated in the
Vitodens (opening pressure 3 bar (0.3 MPa)).
Design information
(cont.)
134
VIESMANN
VITODENS
8
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