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7.7
Protective devices
8
Commissioning /
decommissioning
8.1
Safety
8.2
Filling and bleeding
Installation and operating instructions Wilo-CronoNorm-NL, NLG
• Unused cable feedthroughs should be sealed with the sealing plates
provided, and screwed tight.
NOTE:
The direction of rotation of the motor must be checked in the course
of commissioning.
WARNING! Danger of burns!
The spiral housing and the pressure cover assume the temperature
of the fluid during operation.
• Depending on the application, insulate the spiral housing if neces-
sary.
• Provide corresponding contact protection. The local regulations
must be complied with.
• Observe the terminal box!
CAUTION! Risk of damage to property!
The pressure cover and the bearing bracket must not be insulated.
WARNING! Danger of bodily injury!
Injuries can occur due to missing protective equipment.
• The unit casings of moving parts (such as of the coupling) may not
be removed during machine operation.
• Always wear protective clothing, protective gloves and protective
goggles when working.
• The safety devices on the pump and motor must not be removed or
disabled. They must be checked by an appropriately authorized
technician for proper function before commissioning.
CAUTION! Risk of damage to property!
Due to improper operation, there is a danger of damaging the
pump.
• The pump must not be operated outside of the specified operating
range. Operating outside of the duty point can impair the pump
efficiency or damage the pump. Operating with the valve closed for
more than 5 minutes is not recommended. We generally advise
against hot fluids.
• Make sure that the NPSH-A value is always higher than the
NPSH-R value.
CAUTION! Risk of damage to property!
When using the pump in air-conditioning or cooling applications,
condensate can form, which could damage the motor.
• To avoid motor damage, the condensate drainage holes in the motor
housing must be opened regularly and the condensate drained.
NOTE:
Pumps of the NL series do not have a bleed valve. The suction line and
pump are bled via a suitable bleeding device on the pressure side of
the pump.
WARNING! Risk of injury and damage to property!
Danger due to extremely hot or extremely cold pressurised fluid!
Depending on the temperature of the fluid and the system pres-
sure, when the venting screw is opened completely, extremely hot
or extremely cold fluid in liquid or vapour form may escape or shoot
out at high pressure.
• Make sure the venting screw is in a suitable position.
• Always exercise caution when opening the venting screw.
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