Wilo FLA Compact-1 Helix V16, Installation And Operating Instructions Manual, Page: 42 / 96

English
28 WILO SE 07/2019
Break tank (28):
Tanks in round (Fig. 10a) and rectangular ver-
sion (Fig. 10b)
• Supply connection with float valve (item 30)
• Draw-off connection (item 36)
• Drain (item 37)
• Float switches (item 29) as protection against low
water levels with connection junction box
(item 42)
• Float switch overflow (item 48) in the collection
housing (item 46) with connection to junction box
(item 42)
• Collection housing (item 46) with overflow con-
nection (item 39)
• Aeration and venting with valve plate (item 40)
• Inspection opening (item 41) with closable cover
(clamp)
• Inner wash plates for slowing down the fluid
• Water level indicator (item 38)
• Bypass connections (item 50)
High-pressure multistage centrifugal pump
(Fig. 1a/1b, item 1):
Different types of non self-priming, vertically
installed high-pressure multistage centrifugal
pumps (Helix V) are installed in the FLA Compact,
depending on the performance parameters
required.
FLA Compact-1 uses 1 pump and FLA Compact-2
uses 2 pumps. The attached installation and oper-
ating instructions provide information on the
pumps.
Control device (Fig. 1a/1b, item 2):
Special switchgear and control devices in different
designs are used to activate and control the
FLA Compact fire-extinguishing systems. For
information on the control device installed in this
FLA Compact, see the relevant attached installa-
tion and operating instructions.
Kit pressure switch/diaphragm expansion tank
Series FLA Compact-1 (Fig. 2a)
• Diaphragm expansion tank (item 8) with valve
that can be shut off (item 14)
• Pressure gauge (item 9)
• Pressure switch (item 12)
• Electrical connection, pressure switch (Fig. 3)
• Drain/ venting (item 13)
• Stop valve with drain (item 14)
Series FLA Compact-2 (Fig. 2b)
• Diaphragm expansion tank (item 8)
• Pressure gauge (item 9)
• Pressure switch 1 to 3 (item 12A, 12B, 12C)
• Electrical connection, pressure switch (Fig. 3)
• Venting (item 13)
• Stop valve with drain (item 14)
6.3 Function of the fire-extinguishing system in
accordance with DIN 14462 (FLA Compact)
The FLA fire-extinguishing systems come as
standard with one (FLA Compact-1) or two
(FLA Compact-2) non self-priming high-pressure
multistage centrifugal pumps. The pump or
pumps are supplied with water via the inlet pipe
from the upstream break tank. The pump or
pumps increase the pressure and pump the water
to the consumer via the pressure pipe. To do this,
they are switched on and off according to the
pressure. The systems are equipped with a pres-
sure control kit for automatic control (FLA Com-
pact-1 Fig. 2a; FLA Compact-2 Fig. 2b).
Mechanical pressure switches (Fig. 3) are used for
pressure monitoring; these switch the pump(s) on
and off according to the pressure.
The mechanical pressure switch is generally used
to monitor the pressure present on the consumer
side of the pump. As water consumption
increases, the pressure in the consumer line drops.
When the minimum start-up pressure set on the
pressure switch is reached, a switching signal is
sent to the control device to switch on the pump.
Conversely, when consumption falls (closing of
taps) the pressure in the system rises. When the
switch-off pressure set on the pressure switch is
reached, a switching signal is sent to the control
device to switch off the pump(s). (For a more pre-
cise description of the control process, see the
installation and operating instructions for the
control device.)
FLA Compact-1 (Fig. 2a):
When the pressure reaches or falls below the min-
imum start-up pressure of the pressure switch
(item 12), the pump switches on without delay.
When the switch-off pressure is reached, the
pump is switched off via a time relay in the
switchgear with an optional delay (follow-up
time; this is described in greater detail in the
installation and operating instructions for the
control device).
FLA Compact-2 (Fig. 2b):
When the set minimum start-up pressure for
pressure switch 1 (item 12A) is reached, pump 1
switches on without delay.
Pump 2 provides redundancy functions and is only
started if pump 1 does not reach the set pressure
(switch-off pressure for pressure switch 3
(item 12C)) within a time window (timer). The
timer starts when the pressure falls below the
start-up pressure for pressure switch 2 (item 12B)
and it stops when the pressure reaches the
switch-off pressure for pressure switch 2. The
delay created by the timer is only available again
once the deactivation point for pressure switch 2
has been exceeded. Otherwise, the second pump
starts as soon as the pressure falls below the
start-up pressure for pressure switch 3. (See the
enclosed installation and operating instructions
for the control device.)