Connections On The Water Side; Connections On The Dhw Side - Viessmann Vitodens 300-W Technical Manual

Design information
Rated heating output range [kW]
Vitocell 100-W (type CVUC-A) adjacent to the boiler,
dual mode (for Vitodens 300-W only)
Vitocell 100-B (type CVB) adjacent to the boiler, dual
mode
Vitocell 300-B (type EVBA-A) adjacent to the boiler,
dual mode
Vitocell 340-M (type SVKA) heating water buffer cylin-
der with DHW heating
Vitocell 360-M (type SVSA) heating water buffer cylin-
der with DHW heating

6.4 Connections on the water side

Connections on the DHW side

Vitodens 200-W gas condensing combi boiler
For the DHW connection, connection sets for installation on finished
or unfinished walls are available as accessories. The instantaneous
water heater provides direct DHW heating.
When using galvanised pipes, please note that the instantaneous
water heater is designed as a stainless steel plate heat exchanger
with copper solder joints (observe the flow rule).
In existing installations (modernisation projects), the risk of electro-
lytic corrosion is low, since a protective layer will have formed on the
inside of the pipes.
Cold water installation of Vitodens 200-W gas condensing combi boiler
WW
KW
6
HV GA HR
A Visible drain pipe outlet point
B Safety valve
C Non-return valve
D Drain
E Shut-off valve
F Cold water
GA Gas connection
HR Heating return
HV Heating flow
KW Cold water
WW DHW
A safety valve to DIN 1988 only has to be installed if the mains water
supply pressure exceeds 10 bar (1 MPa), a: 6 bar (0.6 MPa), and
no DHW pressure reducing valve is used (in accordance with
DIN 4753).
VIESMANN
82
(cont.)
Practical cylinder allocation (cylinder capacity in litres)
1.9 to 19.0
300
—
300
705/33
705/33
Safety equipment
4.0 to 26.0
300
500
300
500
705/33
705/33
If DHW is to be drawn simultaneously from several points, we rec-
ommend the installation of a separate DHW cylinder in conjunction
with the gas boiler (see "Decision making aids regarding DHW heat-
ing").
From a water hardness of 20 °dH and higher, we recommend the
use of a water treatment system in the cold water line when heating
DHW.
Install a safety valve if the cold water supply is equipped with a non-
return valve. In addition remove the toggle from the cold water shut-
off valve.
Non-return valves are commonly found in pressure reducers and
combined shut-off and non-return valves.
Shock arrestor
Ø 86
R½"
If the pipework to which the Vitodens is connected includes taps
where water hammers may be created, e.g. pressure washers,
washing machines or dishwashers, install a shock arrestor near the
pressure shock generator (recommendation).
Flexofit S made by Flamco-Flexcon
or
Reflex made by Winkelmann + Pannhoff GmbH (available from your
local dealer).
4.0 to 35.0
300
500
300
500
705/33
705/33
VITODENS