Special Requirements Of Din14462; Shut-Off Devices; Minimum Extraction Amount; Fla Switchgear - Wilo FLA-Serie Einbau- Und Betriebsanleitung

6.4 Special requirements of DIN14462

6.4.1 Shut-off devices

All shut-off devices are secured in the factory
against unauthorised closing or activation. After
commissioning, check that these security devices
still function properly.

6.4.2 Minimum extraction amount

The pumps are protected against overheating and
resultant dry running in the event of reduced vol-
ume load by means of a minimum volume dis-
charge via a bypass circuit. This circuit works
without auxiliary energy. The throttle valve is pre-
set in the factory and secured against unauthor-
ised activation. The volume flow shall be
discharged (e.g. back to the break tank). To do
this, the pre-installed bypass line shall be
expanded on site and connected above the water
trap. The minimum nominal diameter and factory-
configured minimum quantity are shown in the
table in section 8.2.3:

6.4.3 FLA switchgear

See the enclosed installation and operating
instructions for the control device.

6.5 Noise

Depending on the power requirements, the sys-
tem is supplied with a wide variety of pumps
which may vary considerably in terms of their
noise and vibration characteristics. You will find
the relevant data in the installation and operating
instructions for the pump or in the catalogue
specifications for the pump.

7 Setup/installation

7.1 Installation site

The installation is installed in the technical control
room or in a separate, dry, well ventilated, frost-
proof and overflow-proof room that can be locked
(other requirements of the applicable standards to
be observed).
• Adequately dimensioned drainage (drain connec-
tion or similar) must be provided in the installation
room.
• No harmful gases may enter the room or be pres-
ent there.
• Adequate space must be provided for mainte-
nance work. The main dimensions are given on the
attached installation plan. The system should be
freely accessible from at least two sides.
• The installation surface must be horizontal and
flat. The bearing surface must have adequate
load-bearing capacity.
• The system is designed for a maximum ambient
temperature of +0°C to 40°C at relative humidity
of 50 %.
• Installation and operation in the vicinity of living
rooms and bedrooms is not recommended.
Installation and operating instructions Wilo-FLA
• To avoid the transmission of structure-borne
noise and to ensure a stress-free connection to
upstream and downstream pipes, expansion joints
with extension limiters or flexible connection lines
should be used.
NOTE!
In the case of indirect connections, a feed-in
source for the fire brigade should be provided to
ensure additional fire extinguishing options.
WILO recommends providing a hydraulic connec-
tion for this type of feed-in source in each system.
The current DIN 14462 standard shall be
observed.

7.2 Installation

7.2.1 Foundation/bearing surface

The system is constructed for installation on flat
concrete floors. The base frame is mounted on
height-adjustable vibration absorbers as means of
insulation against structure-borne noise.
NOTE!
For transport reasons, the vibration absorbers may
not be installed upon delivery. Before installing
the pressure boosting system, check that all the
vibration absorbers are fitted and locked by
threaded nuts. (see also Fig. 8a/b)
If the customer also wants to secure the installa-
tion to the floor, suitable measures must be taken
to avoid structure-borne noise.

7.2.2 Hydraulic connection and pipes

• Connect the FLA indirectly.
• First perform all the welding and soldering work
and the necessary flushing of the pipework and
the supplied system before connecting the sys-
tem.
• The customer's pipes must be installed without
tension. Expansion joints with extension limiters
or flexible connection lines are recommended for
this purpose in order to avoid stress at the pipe
connections and minimise the transmission of
system vibrations to the building installation. In
order to prevent transmission of structure-borne
noise to the building, do not secure the piping to
the system pipework (see Fig. 8a and 8b for exam-
ple).
• The flow resistance of the suction line must be
kept as low as possible (i.e. short pipe, few elbows
and check valves of sufficient size).
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