Diaphragm Pressure Vessel (Accessory); Safety Valve (Accessory); Non-Pressurised Break Tank (Accessory) - Wilo Comfort Co R-Mvi Serie Manual Del Usuario

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draw-off connection. (If break tanks from the Wilo
range are used, a float switch is already installed
(Fig. 11 and 12)).
• Alternative: Install 3 submersible electrodes in the
break tank. Arrange them as follows:
• Position the first electrode as an earth electrode
just above the base of the tank (must always be
submerged).
• For the upper switching level (low water), posi-
tion the second electrode approx. 100 mm
above the draw-off connection.
• For the lower switching level (no longer low
water), position the third electrode at least
150 mm above the lower electrode.
Connect the wiring to the control device accord-
ing to the installation and operating instructions
and circuit diagram of the control device.

7.2.5 Diaphragm pressure vessel (accessory)

For transportation and hygienic reasons, the dia-
phragm pressure vessel (8 litre) – which is part of
the scope of delivery – may be delivered non-
installed as an accessories kit. The diaphragm
pressure vessel must be mounted on the through-
flow fitting before commissioning (see Fig. 2
and 3).
NOTICE
Make sure the throughflow fitting is not twisted.
The fitting is installed correctly when the drain
valve (see also Fig. 3) and the flow direction
arrows printed on it are parallel to the collecting
pipe.
If an additional larger diaphragm pressure vessel
has to be installed, observe the corresponding
installation and operating instructions. A
Nominal diameter
Connection
3
Max. volume flow (m /h)
Table 1

7.2.6 Safety valve (accessory)

A component-tested safety valve needs to be
installed on the discharge side if the sum of the
maximum possible supply pressure and the maxi-
mum delivery pressure of the pressure boosting
system may exceed the permissible operating
pressure of an installed system component. The
safety valve must be designed so that it will drain
off the volume flow occurring in the pressure
boosting system when the positive operating
pressure is 1.1-times the admissible level (design
data is given in the data sheets/pump curves of
the pressure boosting system). The outflowing
water current must be safely drained away. The
corresponding installation and operating instruc-
tions and the relevant provisions must be
observed when installing the safety valve.
16
DN 20 DN 25 DN 32
(Rp ¾") (Rp 1") (Rp 1¼")
2.5 4.2 7.2
throughflow diaphragm pressure vessel according
to DIN 4807 must be installed for drinking water
installations. When installing a diaphragm pres-
sure vessel, also make sure there is enough room
for maintenance or replacement work.
NOTICE
Diaphragm pressure vessels require regular test-
ing according to Directive 97/23/EC (In Germany,
the Operating Safety Ordinance §§ 15(5) and 17,
as well as Annex 5, must also be taken into
account).
Shut-off devices must be provided upstream and
downstream of the vessel for tests, inspection and
maintenance work on the piping.
To prevent system downtimes, connections for a
bypass can be provided upstream and down-
stream of the diaphragm pressure vessel. Such a
bypass (as for example in the diagrams Fig. 6
and 7, Item 33) must be completely removed at
the end of the work to avoid stagnation of the
water. Special maintenance and test instructions
can be taken from the installation and operating
instructions for the diaphragm pressure vessel
concerned.
The system conditions and the system pumping
data must be taken into account when selecting
the size of the diaphragm pressure vessel. When
doing so, ensure there is sufficient flow through
the diaphragm pressure vessel. The maximum
flow rate of the pressure boosting system must
not exceed the maximum permissible flow rate of
the diaphragm pressure vessel connection (see
Table 1 or the specifications on the rating plate,
and the installation and operating instructions for
the vessel).
DN 50 DN 65
Flange Flange
15 27

7.2.7 Non-pressurised break tank (accessory)

To connect the pressure boosting system indi-
rectly to the public drinking water mains, it must
be installed together with a non-pressurised
break tank according to DIN 1988. The same rules
apply to the installation of the break tank as to the
pressure boosting system (see 7.1). The entire
base of the tank must be in contact with a solid
bearing surface.
The maximum volume of the tank concerned must
be considered when designing the bearing capac-
ity of the bearing surface. When installing, make
sure there is sufficient space for inspection work
(at least 600 mm above the tank and 1000 mm on
the connection sides). The tank must not slant
when full, because an uneven load can destroy the
tank.
The non-pressurised (i.e. under atmospheric pres-
sure) closed PE tank which we supply as an acces-
sory must be installed according to the transport
and installation instructions supplied with the
tank.
DN 80 DN 100
Flange Flange
36 56
WILO SE 07/2017