Hydraulic Connections - Espa CKE Serie Manual De Instrucciones

inside the collector. In CPE sets, the transducer
receives the pressure signal from the attached
pressure tank. See figure 2.
Anti-vibration materials should be inserted between
the equipment and the bedplate.
Flexible tubes should be installed at the outlet of the
suction manifold, if installed, and the discharge
manifold to prevent the transmission of noise and
vibrations along the distribution network.
For better sectorisation, we recommend installing
cut-off valves in front of the suction manifold and
behind the discharge manifold. See figure 3.
A standard installation will include the following
components (Fig. 1):
1. Impulsion manifold.
2. Suction manifold.
diameter must be equal or bigger than that of the
discharge manifold. Install flow valves between
the collector and the pumps to facilitate
disassembly.
3. Anti-vibration. Anchor the set to a solid
foundation (for example a concrete baseplate)
using anti-vibration elements suited to the
equipment's weight.
4. Rubber expansion
transmission of noise and vibrations to the
installation, it is advised to install elastic
expansion joints on the set's discharge and
suction manifolds
5. Expansion vessel. Its function is to compensate
for small water losses in the installation,
preventing the pump from continually starting and
stopping. The load pressure must be 0.5 bar less
than the consigned pressure.
6.
Pressure transducer.

3.2.2. Hydraulic connections

Suction:
The diameter of the suction pipe must be equal to or
greater than that of the set's delivery manifold.
Where possible, the pressure equipment should be
installed fully loaded.
If this is not possible and the set is installed with
negative suction, the horizontal section of the suction
pipe must have a minimum positive gradient of 2%
to avoid the formation of air pockets, and we
recommend as few load losses as possible along
this section.
The pump's NPSHr must be taken into account to
avoid cavitation.
If suctioning from the tank, you must install a foot
valve at least 30 cm below the dynamic water level
to prevent the formation of eddies and the air intake
that can occur as a consequence.
For negative suction installations, the pipes must be
fully primed.
The suction manifold's
joints To prevent the
Discharge:
Make sure the diameter of the discharge pipe is
equal to or larger than that of the set's discharge
manifold.
Neither the suction pipes nor the discharge pipes
should be resting on the pumps. See figure 4.
When a greater diameter is used in the piping these
shall be structured with the related eccentric cones
for suction and concentric cones for discharge.
The position of the flanges must be totally parallel to
effect of minimizing the efforts in the necks of the
collectors of the group
3.3. Electrical power connection
The electrical connections must be made by
authorised personnel, in accordance with local
installation regulations.
DANGER: Before doing any electrical work,
disconnect the mains power supply.
This manual's electrical diagram and the panel
labels, contain the required information for proper
connection set-up.
DANGER. Electrocution risk:
Connection and grounding are mandatory.
Perform all
accordance
(Electrical Installations for Buildings) or the
regulations in force in the destination
country and the local regulations.
The equipments' power supply line must be
properly protected. This protection is aimed
at preventing personal injury in the event of
electric leakage. It is advisable to use an
exclusive power supply line.
The electrical installation will be based on a multiple
system separator with 3mm distance between
contacts.
System protection will be based on a differential
circuit breaker switch (IΔn = 30 mA).
- For devices with single-phase power:
Use RDC "Class A", inmuned at high frequencies
or preferably RCD "Class F"
- For devices with three-phase power:
RCD "Class B"
11
electrical connections
with Standard IEC-60364
EN
in