Installation And Handling - Lorentz PS2-150 Manuel D'installation Et De Fonctionnement

8.5.3 Installation and Handling

CAUTION – The pump unit may be
installed at either a maximum of
3 m / 9'10" below (gravity feed) or above
(suction mode) the water level.
The suction lift may be significantly reduced by flow resist-
ance in the suction line (if the pipes are very long and/or
insufficiently dimensioned). The suction/inlet pipe should be
as short as possible.
NOTE – Inlet and outlet of PS surface
pumps for pools are metric sized. The
pumps are supplied with adaptors which
are compatible with local market
requirements.
When ordering pumps for US/imperial (inch) markets adap-
tors are provided to connect standard NPS (inch) pipes.
When ordering pumps for metric markets adaptors are pro-
vided to allow connection of the next sized up metric pipe.
The table below shows the outer pipeline dimensions for the
pump inlet and outlet pipe using the supplied adaptors.
Table 8: Nominal pipe size (NPS) and outer dimension (OD)
Model US/imperial
Adaptor provided to
CS-17-1 connect 2.375'' for
pipe with NPS 2''
Adaptor provided
CS-37-1 to connect 3.5" for
pipe with NPS 3"
The nominal pipe size (NPS) and the outer dimensions (OD)
values are not equal between 1/8 to 12" sizes. For example,
the OD of an NPS 2" pipe is actually 2.375". Please pay
attention to the actual dimensions of the pool pipework.
Before joining the pipework to the connecting pieces of the
housing, the adhesive surfaces must be cleaned completely.
Pay attention to the gluing and safety instructions of the
adhesive manufacturer.
Pipe system – We advise that pipe expansion joints are
used on both sides near to the pump to reduce noise and
vibration. It is recommended that you install a gate valve
in the suction and discharge pipeline close to the pump
to avoid draining of the pipe while cleaning (e.g. filters),
repairing, servicing or replacing the pump system.
Check valve – If the pump is installed above water level a
check valve at the bottom of the inlet pipe is needed in or-
Metric
der to ensure that the pump and its suction pipeline remain
completely water filled during the time the pump is OFF. In
order to minimize pressure losses, the check valve should
50 mm native con-
be sized correctly. Always install a check valve which is one
nection and adaptor
inch (1") larger than the suction pipe in order to avoid too
for 63 mm
much suction pressure drop. For example, with a 3" suction
63 mm native con-
pipe a 4" check valve should be installed.
nection and adaptor
for 90 mm
Strainer – Never operate the pump without having the
strainer basket in the pump housing. A full or dirty strainer
will impair the flow rate and the filtration. The strainer bas-
ket must be regularly emptied and cleaned. Pay attention to
chapter "12.2 Cleaning the strainer".
Pump Installation
CAUTION – Inlet and outlet pipes must be
mounted to the pump housing in a way
that is free of tension.
CAUTION – Make sure that the suction
pipe is sealed with no leaks, otherwise the
pump will not prime or will prime
insufficiently.
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