Hydraulic Connection; General - Viessmann Vitodens 300-W Technical Manual

Design information
Contact your local authority responsible for waste water manage-
ment in good time prior to installation, to find out about local regula-
tions.
Condensate from gas combustion equipment up to 200 kW
combustion output
Up to a rated heating output of 200 kW, the condensate from a gas
condensing boiler can generally be introduced into the public sew-
age system without prior neutralisation.
Domestic drainage systems must be made from materials that are
resistant to acidic condensate.
According to the Code of Practice DWA-A 251, these materials
include:
■ Clay pipes
■ Hard PVC pipes
■ PVC pipes
■ PE HD pipes
■ PP pipes
■ ABS/ASA pipes
■ Stainless steel pipes
■ Borosilicate pipes
Neutralising system
B
6
A Condensate drain
B Neutralising system
C Ventilation via the roof

6.6 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 capturing of the room-influencing factors, we
recommend using the Vitodens with constant temperature control
unit in conjunction with the Vitotrol 100 for apartments with less than
2
80 m living space or for low energy houses with a low heat demand.
VIESMANN
86
(cont.)
C
A
The Vitodens can (if required) be supplied with a separate neutralis-
ing system (accessories). 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.
Neutralising system
310 DN 40
Condensate lifting system (accessories)
A
A Condensate inlet
B Condensate lifting system
C Condensate drain
To reduce burner cycling in low energy houses with a correspond-
ingly low heat demand, we recommend the use of a low loss header
or a heat generator with a small partial load such as the
Vitodens 300-W with 1.9 to 19 kW.
The heat generator must be correctly sized and selected.
Chemical anti-corrosion agents
In correctly installed and operated sealed unvented heating systems
corrosion is generally avoided.
Never use chemical anti-corrosion additives.
C
B
VITODENS