Wilo COE-2 MHIL Série Notice De Montage Et De Mise En Service page 27

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Faults
1 or 2 pumps are not starting
Installation and operating instructions Wilo-COE-2 MHIL
Causes
Air intake during suction
Foot valve suction strainer in
the reservoir is permeable or
obstructed
Significant friction losses on the
suction side
Municipal water supply pressure
too low or 0
Negative suction head over
reservoir too great
Suction pipework obstructed
or valve on suction manifold
closed
The pumps are turning in the
wrong direction (three-phase)
Remedies
Check the impermeability of all connections in the
suction pipework.
Check that the suction strainer for the reservoir is
properly submerged in water.
Check the impermeability of the valve and replace
it if necessary.
Calculate the friction losses and make sure that
they are compatible with the NPSH for the pumps.
If the issue persists, it is important to use a reservoir.
Ensure that the minimum level of the reservoir
is compatible with the NPSH for the pumps.
Check that the valve is open and clean pipework
if necessary.
Cross-wire 2 power supply wires on the motor
terminals.
English
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