Xylem LOWARA ESH S Serie Manual De Instalación, Funcionamiento Y Mantenimiento página 27

(earth) leakage.
7.8 The pump runs but delivers too
little or no liquid
Cause
There is air inside the
pump or the piping.
The pump is not
correctly primed.
The throttling on the
delivery side is too
extensive.
The rotation direction of
the impeller is wrong.
7.9 The electric pump stops, and
then rotates in the wrong
direction
Cause
There is a leakage in
one or both of the
following components:

The suction
pipe

The foot
valve or the
check valve
7.10 The pump starts up too
frequently
Cause
There is a leakage in
one or both of the
following components:

The suction
pipe

The foot
valve or the
check valve
There is a ruptured
membrane or no air
precharge in the
pressure tank.
7.11 The pump vibrates and
generates too much noise
the electrical system
components.
Remedy

Bleed the air
Stop the pump and
repeat the prime
procedure.
If the problem continues:

Check the
suction pipe
for perfect
tightness.

Replace any
valves that
are leaking.
Open the valve.
Change the position of
two of the phases on the
terminal board of the
motor or in the electric
control panel.
Remedy
Repair or replace the
faulty component.
Remedy
Repair or replace the
faulty component.
See the relevant
instructions in the
pressure tank manual.
Cause
Pump cavitation
There are foreign
objects inside the
pump.
Contact Xylem or the Authorised Distributor with
regard to any situation not covered here.
en - Original instructions
Remedy
Reduce the required
flow rate by partially
closing the on-off valve
downstream from the
pump. If the problem
persists check the
operating conditions of
the pump (for example
height difference, flow
resistance, liquid
temperature).
Contact Xylem or the
Authorised Distributor.
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