Viessmann vitodens Technical Manual page 62

2.5 Connections on the gas and the water side
Cold water installation separate DHW cylinder and loading cylinder for Vitodens 333
Example: Wall mounted DHW cylinder (80 litres) with safety equipment assembly to DIN 1988
2
A
A Hot water
B Safety valve
C Visible blow off pipe outlet
D Cold water
E Drain
The safety valve must be installed.
Recommendation: Install the safety valve higher than the top edge of the DHW cylinder. This protects the valve against
contamination, scaling and high temperatures. In addition, the DHW cylinder does not then need to be drained when working on the
safety valve.
*1
According to DIN 1988 2, a drinking water filter should be installed in systems with metal pipework. DIN 1988 and Viessmann also
recommend the installation of a drinking water filter when using plastic pipes, to prevent contamination entering the DHW system.
62
O
B
F G H
C
Safety assembly to DIN 1988
P
E
F Shut-off valve
G Flow regulating valve
(installation recommended)
H Pressure gauge installation
K Non-return valve
L Drinking water filter
KE F F E L
D
M Pressure reducer
N Non-return valve/pipe separator
O Standard delivery of the safety
*1
P Diaphragm expansion vessel for DHW
M F N D
DIN 1988 2 Issue Dec. 1988
equipment offered as accessory
VITODENS