Wilo NL-HE Series, Инструкция по установке и эксплуатации

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Maintenance/repair en
Installation and operating instructions Wilo NL-HE 31
9.1 Personnel qualifications
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Electrical work: A qualified electrician must carry out the electrical work.
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Maintenance tasks: The technician must be familiar with the use of operating fluids and
their disposal. In addition, the technician must have basic knowledge of mechanical en-
gineering.
9.2 Operation monitoring
CAUTION
Risk of property damage!
Improper operation can damage the pump or motor. Operating with the shut-off device
closed for more than 5 minutes is not recommended and generally dangerous in the case
of hot fluids.
• Never allow the pump to run without fluid.
• Do not operate the pump with the shut-off device in the suction line closed.
• Do not operate the pump for a longer period of time with the shut-off device in the
pressure pipe closed. This can cause the fluid to overheat.
The pump must run quietly and vibration-free at all times.
The rolling bearings must run quietly and vibration-free at all times.
Increased current consumption with unchanged operating conditions is a sign of bearing
damage. The bearing temperature may be up to 50°C above the ambient temperature, but
never rise above 80°C.
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Check the static gaskets and the shaft seal regularly for leakages.
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For pumps with mechanical seals, there is little to no visible leakage during operation. If a
gasket is leaking significantly, this is a sign that the gasket surfaces are worn. The gasket
must be replaced. The service life of a mechanical seal greatly depends on the operating
conditions (temperature, pressure, fluid properties).
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Wilo recommends checking the flexible coupling elements regularly and replacing them
at the first sign of wear.
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Wilo recommends briefly putting the standby pumps into operation at least once a week
to ensure they are always ready for operation.
9.3 Maintenance tasks
The bearing bracket of the pump is equipped with rolling bearings that have lifetime lubric-
ation.
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The rolling bearings of the motors are to be maintained according to the installation and
operating instructions of the motor manufacturer.
9.4 Draining and cleaning
WARNING
Risk of injury and damage to property!
• Dispose of the pump contents and rinsing fluid by taking the legal regulations into
account.
• Always wear protective clothing, protective gloves and protective goggles when
working.