K4100714000001-00 / 05.2017
6
The dimensions of the pipe conducting the
cold water to the drinking water heater can
be determined on the basis of the hot water
demand,
as
described
above.
The
connection selected for the basic module of
the safety group has to be DN 20, DN 25 or
DN 32, according to the selected pipe
dimensions. The safety group in size DN 20
can, therefore, be used for pipe dimensions
from DN 20 to DN 32 ((cold) drinking water
piping).
2.2
Pressure drop
The flow rate achievable with the KEMPER
safety group ((kvs value) of 4.52 m³/h)
with a 100 MPa pressure drop is higher
than the flow rate of 3.99 m³/h required for
safety groups in standard DIN EN 1488.
In practice, this means that the safety
group constitutes a resistance of 100 MPa
at a volumetric flow rate of 4.5 m³/h. This
drop in pressure has to be taken into
consideration when calculating the piping
network. The flow rate can be exceeded at
any time, with the pressure drop of 100
MPa then also being exceeded, which may
lead to the generation of noise and should
therefore be avoided.
Installation
The KEMPER Module S safety group is
installed together with the KEMPER basic
module and the fittings in the piping
conducting the cold water to the drinking
water heater (heed direction of flow!). The
piping must be thoroughly flushed through
before installation. If the KEMPER basic
module is installed beforehand (e.g. in the
carcassing phase), an unhindered flow of
water can be ensured by fitting the
optionally
available
flow
cap.
The
universally rotatable KEMPER basic module
enables the safety group to be installed
horizontally or vertically in the cold water
piping.
Always connect the safety group
to the basic module with the
vertical main axis (diaphram-type
safety valve, top)!
DIN 1988 recommends installing
the safety group above the
highest possible water level of the
drinking water heater, thereby
making it possible to avoid the drainage of
hot water when maintenance work is carried
out.
DIN 1988-2 stipulates that there must be no
shutoff units, restrictions and screening
devices situated between the safety valve
and the drinking water heater!
A
flow-through-type,
DVGW-certified
expansion vessel conforming to DIN 4708
Part 5 can be installed between the
KEMPER safety group and the drinking
water heater to accommodate the volume
of expansion water, thus ensuring that
drinking water hygiene is maintained in and
around the expansion vessel.
