Special Requirements Of Din 14462; Shut-Off Devices; Minimum Extraction Amount; Switchgear Fla Compact - Wilo FLA Compact Notice De Montage Et De Mise En Service

CAUTION! Safety instructions for guaranteeing
function
The start-up pressure for the second pressure
switch must be larger than the switch-on pres-
sure for the third pressure switch.
When the pressure reaches the switch-off pres-
sure for pressure switch 1, pump 1 is switched off
once the follow-up time has elapsed.
If pump 2 has started, it is switched off once the
pressure reaches the switch-off pressure for pres-
sure switch 2 and once the follow-up time has
elapsed.
The fitted diaphragm expansion tank (Fig. 2a/2b,
item 8) has a buffer effect when the system is
switched on and off and it also allows small
amounts of water to be extracted from the stor-
age volume without switching on the pump. This
reduces the switching frequency. The pressure
gauge enables visual inspection of the current
pressure. During maintenance or repair work, use
the drain valve to relieve the pressure switch. See
point 8.2 for information about setting the pres-
sure switch.
CAUTION! Risk of damage!
To protect the mechanical seal or plain bearing,
do not allow the pumps to run dry. Leakages may
be caused by a pump running dry.
Sound-pressure level max. (*)
Lpa in [dB(A)]
(*) Values for 50 Hz (fixed speed) with tolerance of +3 dB(A)
Lpa = workplace-related emission level in dB(A)
Table 2
The system is designed for the operation of a
pump. If malfunctions causes a second pump to
switch on, then the sound-pressure level will
increase by approx. 3 dB(A).
The sound-pressure level through the replenish-
ment via the float valves can be up to 75 dB(A).

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
present there.
Installation and operating instructions Wilo-FLA Compact
3 4 5.5
63 68 69

6.4 Special requirements of DIN 14462

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 (Fig. 11)
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. This volume flow is
defined by a flow restrictor (item 18) and is dis-
charged to the break tank from the pump via a
shut-off device (item 11), the cover, the bypass
line (item 15) at the connection (item 15b).
CAUTION! Safety instructions for guaranteeing
function
A blocked or non-connected bypass line can
lead to pump failure.

6.4.3 Switchgear FLA Compact

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

6.5 Noise

In the following table 2, pumps of the standard
series with Helix V are taken into account at a
mains frequency of 50 Hz.
Rated power (KW)
7.5 9 11
69 70 71
• 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 baseplate of the break tank must be
supported across its entire surface.
• The break tank must remain accessible for main-
tenance even after installation (at least 600 mm
above the tank, 1000 mm at the operating side).
• 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.
• To avoid the transmission of structure-borne
noise and to ensure a stress-free connection to
upstream and downstream pipes, compensators
with extension limiters or flexible connection
pipes should be used.
English
15 18.5
69 72
29