English
Installation and operating instructions Wilo-CronoNorm-NL, NLG
27
WARNING! Risk of injury and damage to property!
• When draining, particularly hot fluids or fluids which are harmful to
health, take measures to protect personnel and the environment,
for example the use of protective clothing, protective gloves and
protective goggles.
• Pumps which pump hazardous fluids must be decontaminated.
9.2
Operation monitoring
CAUTION! Risk of damage to property!
Risk of damaging the pump or the motor due to an unsuitable oper-
ating mode.
• Do not allow the pump to run without fluid.
• Do not operate the pump with the check valve in the suction line
closed.
• Do not operate the pump for a longer period of time with the check
valve in the pressure pipe closed.This can cause the fluid to over-
heat.
The pump must run quietly and vibration-free at all times.
The roller 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.
• Check the static gaskets and the shaft seal regularly for leaks.
• For pumps with mechanical seals, there is little to no visible leakage
during operation.If there is considerable leakage at the gasket, this
means that the gasket surfaces are worn and that the gasket has to
be replaced. The service life of a mechanical seal greatly depends on
the operating conditions (temperature, pressure, fluid properties).
• For pumps with a stuffing box packing, make sure the drip leakage is
sufficient (approx. 20 - 40 drops per minute). The nuts of the stuffing
box gland should only be slightly tightened. If there is excessive stuff-
ing box leakage, further tighten the nuts of the stuffing box gland
slowly and evenly until the leakage is reduced to single drops. Check
the stuffing box for overheating by hand. If the nuts of the stuffing
box gland cannot be further tightened, replace the old packing rings.
• Wilo recommends checking the flexible coupling elements regularly
and replacing them at the first sign of wear.
• 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 work
The bearing bracket of the pump is equipped with roller bearings
which have lifetime lubrication.
• The roller 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!
• Remaining fluid and rinsing fluid is to be collected and disposed of.
• The disposal of the harmful fluids must be done in accordance with
the legal regulations.
• For all work, wear protective clothing, a protective mask, protec-
tive gloves and protective goggles.
