Piping Requirements - Xylem Lowara ESH ATEX Manual De Instalación, Funcionamiento Y Mantenimiento

correspond to the temperature of
the liquid T °C
0.5 Recommended safety margin (m)
Z Maximum height at which the
pump can be installed (m)
(pb*10.2 - Z) must always be a
positive number. For more
information, see Figure 13.
NOTICE:
Do not exceed the pumps suction capacity as
this could cause cavitation and damage the
pump.

4.2.2 Piping requirements

Precautions
WARNING:
 Use pipes suited to the maximum
working pressure of the pump.
Failure to do so can cause the
system to rupture, with the risk of
injury.
 Make sure that all connections are
performed by qualified installation
technicians and in compliance with
the regulations in force.
NOTICE:
Observe all regulations issued by authorities
having jurisdiction and by companies
managing the public water supplies if the
pump is connected to a public water system. If
required, install appropriate backflow-
prevention device on the suction side.
Piping checklist
Check that the following requirements are met:

All piping is independently supported,
piping must not place a burden on the
unit.

Flexible pipes or unions are used, in order
to avoid transmission of pump vibrations
to the pipes and vice versa.

Use wide bends, avoid using elbows
which cause excessive flow resistance.

The suction piping is perfectly sealed and
air- tight.

If the pump is used in an open circuit,
then the diameter of the suction pipe is
suited to the installation conditions. The
suction pipe must not be smaller than the
diameter of the suction port.

If the suction piping must be larger than
the suction side of the pump, then an
eccentric pipe reducer is installed.

If the pump is placed above liquid level, a
foot valve is installed at the end of the
suction piping.

The foot valve is fully immersed into the
liquid so that air cannot enter through the
suction vortex, when the liquid is at the
minimum level and the pump is installed
above the liquid source.

Appropriately sized on-off valves are
installed on the suction piping and on the
delivery piping (downstream to the check
valve) for regulation of the pump capacity,
for pump inspection, and for maintenance.

Appropriately sized on-off valve is
installed on the delivery piping
(downstream to the check valve) for
regulation of the pump capacity, for pump
inspection, and for maintenance.

In order to prevent back flow into the
pump when pump is turned off a check
valve is installed on the delivery piping.
WARNING:
Do not use the on-off valve on the
discharge side in the closed position
in order to throttle the pump for more
than a few seconds. If the pump must
operate with the discharge side
closed for more than a few seconds, a
bypass circuit must be installed to
prevent overheating of the liquid
inside the pump.
For illustrations that show the piping
requirements, see Figure 14 and Figure 15.
4.3 Electrical requirements

The local regulations in force overrule
these specified requirements.
Electrical connection checklist
Check that the following requirements are met:

The electrical leads are protected from
high temperature, vibrations, and
collisions.

The power supply line is provided with:
–
A short-circuit protection device
–
A mains isolator switch with a
contact gap of at least 3 mm.
The electrical control panel checklist
NOTICE:
The control panel must match the ratings of
the electric pump. Improper combinations
could fail to guarantee the protection of the
motor.
Check that the following requirements are met:

The control panel must protect the motor
against overload and short-circuit.

Install the correct overload protection
(thermal relay or motor protector).
Pump Type Protection
– Built-in automatic
Single
phase
standard
electric
pump ≤
– Short circuit
2.2 kW
en - Original instructions
reset thermal-
amperometric
protection (motor
protector)
protection (must
be supplied by the
1
installer)
25