Electrical Connection; General; Hydraulic Connection; Protection Of The System - Wilo SiFire Easy Série Notice De Montage Et De Mise En Service

CAUTION! Risk of contamination and damage to
health!
For units with a diesel pump, waterproof the
floor of the system room to avoid contamination
of the subsoil because of possible diesel or
engine oil losses.
NOTE:
It is recommended to equip the pump's switch-
gear with an alarm system for pump failure, under
voltage condition, etc.

7.4 Electrical connection

7.4.1 General

DANGER! Risk of fatal injury!
Electrical connections must be carried out by
authorised and skilled personnel in accordance
with standards and laws in force. Power supply
must be available at any times (EN 12845
10.8.1.1).
• Check the type of power supply and the avail-
able voltage and compare them with data of
pumps, motors, switchgear and other devices.
Before performing an intervention, control the
earth connection.
• For connection to power supply networks, use
one-piece cables, without joints, exclusively
dedicated to the pump unit for the fire depart-
ment, connected in front of the main power
supply switch of buildings.
• Use cables with a suitable diameter whose char-
acteristics and dimensions are in compliance
with IEC standards in force and with specifica-
tions required by the EN 12845 standard.
• To protect the cables from direct exposure in
case of fire, they must pass through pipes buried
outside the building or through parts of the
building where the fire hazard is negligible. If it
is not possible, they must also have an additional
direct protection with a 180 minutes fire resist-
ance.
• Make connections are done according to the
wiring diagrams supplied with the switchgears.
• The main electrical box must be located in com-
partment protected against fire and exclusively
used for power supply.
• Electrical connections in the main box must be
made to ensure continuous power supply to the
pump's switchgear even if power is cut to other
utilities.
• The fire extinguishing pump supply lines, classi-
fied as safety service supply lines CEI 64.8 – 56,
must ONLY be protected against short-circuits
and direct contacts.
THEY MUST NOT BE PROTECTED AGAINST
OVERLOADS.
• For protection, see the requirements of the
electricity project (earth connection, equipo-
tential bonding)
• Connect batteries for diesel pumps
• Check the tightening of all electrical connec-
tions
Installation and operating instructions Wilo-SiFire Easy

7.4.2 Hydraulic connection

Connect the following circuits to pumping tank or
to priming tanks, by respecting the requirements
imposed by standard:
• Flow rate metering circuit for the pump test. If the
return to the tank is not possible, plan draining
towards the mains drainage (See Fig. 5)
• Recirculation pipes. The recirculation circuit is
used to prevent overheating and damage to
pumps that remain in operation when the level of
pressure in the system is reached and before they
are turned off manually by authorised personnel.
• Sprinkler supply circuit of the fire extinguishing
system room;
• Connect main pumps and jockey pump to the fire
extinguishing system in accordance with the
EN 12845 standard and the installation diagram;
• Connect the jockey pump directly to the water
tank by using a suction pipe which is adequately
proportioned to avoid priming pump trouble;
• Check the tank of the jockey pump pre-inflation
and adjust it according to the pressure value which
has to be maintained in the system according to
the instructions written on the tank or in its
instruction manual;

7.4.3 Protection of the system

• The specific standard for fire extinguishing sys-
tems foresees protections against short-circuits
with the use of high breaking capacity fuses,
which allow the passage of initial current for the
start of the electric motor for a period longer than
20 seconds. These fuses are held inside the elec-
tric pump's switchgear. No thermal protections for
the main fire extinguishing pumps are provided.
• Thermal protection against the overload of the
jockey pump is installed inside its switchgear. It
must be calibrated at a value slightly higher than
the absorbed or nominal current (in) for the motor.
• The standard does not stipulate the protection
against lack of water of the pumps. In case of
emergency, the pumps must use any available
water of the tanks for extinguishing fire.
• In the case of a diesel engine, the switchgear of
the diesel engine manages engine operating
parameters and possible alarms. For more infor-
mation concerning diesel engine boxes, see the
special instruction manual of the switchgear.
INSTALLATION ADVICE
• According to the type of installation planned for
the project, the pressure boosting system can
operate correctly if the following aspects are con-
sidered:
• pipes are positioned in such a way that air accu-
mulation avoided;
• suction pipes between the intake point and the
pumping has to be as short as possible. Its diam-
eter must be suitable and equal or exceed the
minimum required to maintain the maximum
speed as indicated in the EN 12845 standard
• pipes do not have leakages or air infiltration
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