Dhw Circulation Pipe For Cylinder Banks - Viessmann VITOCELL 100-V Installation Instructions Manual

Connections on the DHW side
Pressure gauge connection
N
Non-return valve
O
Drain outlet
P
Cold water
R
Safety valve
The system must be equipped with a type-tested dia-
phragm safety valve as protection against overpres-
sure.
Permiss. operating pressure: 10 bar (1 MPa).
The connection diameter of the safety valve must be
as follows:
For 160 and 200 l at least R
■
input 75 kW
■ Above 200 to 1000 l at least R
input 150 kW
Above 1000 to 5000 l at least R 1 (DN 25); max. heat
■
input 250 kW
Select a safety valve with a higher rating if the heat
input of the DHW cylinder is greater than the maximum
heat input assigned to the capacity. (See DIN 4753-1,
issue 3/88, section 6.3.1).

DHW circulation pipe for cylinder banks

Note
Always implement the cylinder banks with connected
DHW circulation.
Connect the DHW circulation pipe when linking several
cylinders in conjunction with boilers or district heating
systems without a heating water return temperature
limiting facility and a DHW circulation pipe:
WW
Z
KW
Fig. 17
Spring-loaded check valve
A
KW Cold water
WW DHW
(cont.)
(DN 15); max. heat
½
(DN 20); max. heat
¾
ZP
Drinking water filter
S
Pressure reducer
T
Non-return valve/pipe separator
U
Install the safety valve in the cold water line. Ensure it
cannot be shut off from the DHW cylinder. There must
be no constrictions in the pipework between the safety
valve and the DHW cylinder. Never seal off the safety
valve discharge pipe. Ensure that any expelled water
is safely and visibly drained into a drainage system.
Position a sign close to the safety valve discharge
pipe, or ideally on the safety valve itself, with the fol-
lowing inscription: "For safety reasons, water may be
discharged from the discharge pipe during heating.
Never seal." Install the safety valve above the top edge
of the DHW cylinder.
Z DHW circulation pipe
CP DHW circulation pump
19