Vitodens 200-W connection on the DHW side with separate DHW cylinder and Vitodens 222-W with integral loading cylinder
Example:
DHW cylinder below the boiler (120 or 150 l) with safety assembly to
DIN 1988
C
H
B
F
G
KE F
D
F E L
M
F N D
E
P
O
A
Sicherheitsgruppe nach DIN 1988
A
DHW
B
Safety valve
Included in the standard delivery of the pre-plumbing jig for
Vitodens 222-W
C
Visible discharge pipe outlet point
D
Cold water
E
Drain outlet
F
Shut-off valve
G
Flow regulating valve (installation recommended)
H
Pressure gauge connector
K
Non-return valve
L
Drinking water filter
M
Pressure reducer to DIN 1988-2, Dec. 1988 version
N
Non-return valve/pipe separator
O
Standard delivery of the safety assembly available as an acces-
sory (for separate DHW cylinders only)
P
Diaphragm expansion vessel, suitable for potable water
Safety valve
The safety valve
must
be installed.
We recommend you install the safety valve higher than the top edge
of the cylinder. This protects the valve against contamination, scaling
and high temperatures. It also means that the DHW cylinder does
not need to be drained when working on the safety valve.
Drinking water filter
Install a drinking water filter in accordance with DIN 1988-200.
DHW circulation
Only in conjunction with the Vitodens 200-W. Cannot be used with
the Vitodens 222-W because of the integral loading cylinder.
DHW circulation pipes increase DHW convenience and reduce water
consumption. These benefits result from the immediate availability of
DHW at the tap/draw-off point.
However, poor thermal insulation of the DHW circulation pipe can
lead to substantial heat losses.
From a
pipe length
of
7 m
upwards, we recommend the installation
of a DHW circulation pipe with appropriate thermal insulation in
accordance with the Energy Saving Ordinance. The Energy Saving
Ordinance specifies that the DHW circulation pipe should include a
circulation pump, check valve and time switch for stopping DHW cir-
culation during the night.
Power supply for DHW circulation pump
DHW circulation pumps equipped with their own internal control unit
must be connected via a separate power supply. Connecting the
power supply via the heat generator control unit or its accessories is
not
permissible.
Using a non-return valve
If using a DHW cylinder adjacent to the boiler, we recommend instal-
ling a non-return valve in the heating water connection line to pre-
vent the DHW cylinder cooling due to any recirculation that may
occur.
Design information
(cont.)
VITODENS
VIESMANN
129
5853906
8
Summary of Contents for Vitodens 200-W B2HE
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