Problems, Causes And Remedies - Wilo Smart 25/4 Instrucciones De Instalación Y Funcionamiento

– Carefully push the pump shaft
back several times using a scr-
ewdriver.
– Protect all
against the water released from
the unit.
– Switch pump back on.
ATTENTION!
Depending on the
intensity of the ope-
rating pressure, the
pump is liable to
block
screw plug is open.
– After 15 to 30 s tighten the vent
plug.
– Re-open the shut-off valve.
Switching the control range (diffe-
rential pressure range) (fig. 7)
If the rooms are not being suffi-
ciently heated, the pump control
channel may be too low. In this
case you will need to switch to a
higher control channel.
If, on the other hand, the pump is
set at too high a differential pres-
sure range, flow noise may occur
in the lines and in particular at
throttled thermostatic valves. This
can be remedied by switching to a
lower control channel.
This is done using the selector
switch on the terminal box.
After switching to a different con-
trol range, it will take some time
before the heating installation con-
trol becomes stable.
electrical parts
when the
7 Maintenance
Prior maintenance or repair
work switch off the pump
and secure against unaut-
horized switching.
8 Problems, Causes
and Remedies
Motor is switched on but fails to
run:
– Check electrical fuses.
– Check voltage at pump (observe
rating plate data).
– Motor is blocked, e.g. by depo-
sits from the heating water.
At high water temperatures
and system pressure close
the isolating valves in front
of and behind the pump.
Allow pump to cool down
first.
If the blockage has still not cleared
up after the automatic unblocking
procedure, fully remove the vent
plug then check and if necessary
rectify the free running of the pump
rotor by turning the slotted end of
the shaft with a screwdriver (fig. 6).
Noisy pump operation
– In the event of cavitation as a
result of insufficient admission
pressure, increase the system
admission pressure within the
permitted range.
ENGLISH
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