Faults, Causes And Remedies - Wilo HiMulti 3 Instrucciones De Instalación Y Funcionamiento

8. Commissioning
8.1 Filling – venting
CAUTION! Risk of damage to the pump.
Never operate the pump dry, even briefly.
The system must be filled before starting the
pump.
Pump in inlet mode (Fig. 3, 9)
• Close the discharge valve (item 3).
• Unscrew the priming plug slightly (item 5).
• Gradually open the suction valve (item 2) and
completely fill the pump.
• Open the discharge valve (item 3).
• Only close the priming plug (pos. 5) manually
until stop when water has flowed out and all air
has escaped.
Pump in suction mode (Fig. 2, 9)
• Make sure that all the accessories connected to
the pump pressure connection are open (taps,
valves, watering hose nozzles).
• Open the discharge valve (item 3).
• Open the suction valve (item 2).
• Unscrew the priming plug (item 5) on the pump
housing.
• Completely fill the pump and the suction pipe,
which must be fitted with a foot valve.
• Screw back in the priming plug manually until
stop (item 5).
• Activate the pump for a few seconds using the
on/off switch. After stopping it again, unscrew
the priming plug and add water to finish com-
pletely filling the pump.
• If the suction head is greater than 6 m, hold the
pressure pipe in a vertical position to a height
of at least 500 mm until the pump is primed, in
order to prevent the water from escaping from
the pump through the pressure pipe.
8.2 Checking the direction of rotation of the motor
The single-phase motors are designed to function
in the correct direction of rotation.
8.3 Starting
CAUTION! The pump must not operate at zero
flow (discharge valve closed) for more than 10
minutes.
WARNING! Risk of burns!
Zero flow operation causes the water tempera-
ture to rise.
To prevent formation of an air pocket, we rec-
ommend ensuring a minimum flow equal to or
greater than about 15% of the rated flow rate of
the pump.
• Open the discharge valve.
• Switch on power to the pump and start it up by
pressing the on/off switch (the indicator light will
switch on).
• In the case of a self-priming pump, if the suction
pipe has not been filled completely, starting may
take a few minutes (keep the discharge valve
Installation and operating instructions - Wilo-HiMulti 3
open).
• If the water does not come out after 3 minutes,
stop the pump and repeat the filling procedure.
• Once the pump has started, close the discharge
valve completely and then reopen it to ensure
that the maximum pump curve is reached; this is
reached with the priming valve closed.
• Check that the current consumed is less than or
equal to that indicated on the motor plate.
9. Maintenance
All maintenance work must be carried out by
authorised and qualified personnel!
WARNING! Risk of electric shock!
Danger from electrical current must be eliminat-
ed.
Before any electrical work, the pump must be
de-energised (switched off) and protected
against unauthorised restarting.
It is recommended to the disconnect the plug
rather than the male electrical connector (IPX4
preservation).
• No special maintenance required during opera-
tion.
• Keep the pump clean.
• If the pump is deactivated for a long period and
there is no risk of freezing, it is best not to drain
the pump.
• To prevent the shaft and the hydraulic compo-
nents from seizing up during periods of freezing
temperatures, drain the pump by removing the
plug (item 6) and the priming plug (item 5).
Screw back in the 2 plugs but do not tighten
them. Fill the pump and the piping before using
again.
NOTE: We recommend rinsing the pump after a
long period of deactivation.

10. Faults, causes and remedies

WARNING! Risk of electric shock!
Before any work on the pump, DE-ENERGISE the
pump by turning off the on/off switch and dis-
connecting the electrical supply to the pump, and
prevent unauthorised restarting. The indicator
light being off does not mean that the pump is
de-energised.
It is recommended to the disconnect the plug
rather than the male electrical connector (IPX4
preservation).
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