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8.5
Leak check
Installation and operating instructions Wilo-CronoNorm-NL, NLG
WARNING! Danger of bodily injury!
Danger due to high system pressure.
• Do not connect pressure gauges to a pressurised pump.
• The power and status of the installed centrifugal pumps must be
constantly monitored. Pressure gauges are to be installed on the
suction side and on the pressure side.
NOTE:
It is recommended to install a flow meter, since otherwise the pump
delivery rate cannot be exactly determined.
CAUTION! Risk of damage to property!
Danger of overloading the motor.
• To start up the pump, use the soft start, star-delta switching or
speed control.
• Switch on the pump.
• After reaching the speed, slowly open the check valve in the pressure
pipe and regulate the pump to the duty point.
• While the pump is starting, bleed completely via the venting screw.
CAUTION! Risk of damage to property!
Risk of damaging the pump.
• If abnormal noises, vibrations, temperatures or leaks occur during
starting, the pump must be switched off immediately and the cause
remedied.
Mechanical seal:
The mechanical seal is maintenance-free and usually has no visible
leakage losses.
Stuffing box packing:
WARNING! Danger of bodily injury!
Work on the stuffing box packing is done while the pump is run-
ning, and must be done with extreme caution.
The stuffing box packing drips slightly during operation. The leakage
rate should be between 10 and 20 cm
the stuffing box gland is only slightly tightened.
• After an operating time of 5 minutes, reduce excessively high leakage
by evenly tightening the nuts by approx.
• After another 5 minutes, check the leakage rate. Repeat this process
until the recommended leakage rate is set.
• If the leakage rate is too low, increase it by loosening the nuts.
• Watch the leakage during the first couple operating hours at the max-
imum fluid temperature. At the least amount of delivery pressure,
there must be sufficient leakage.
English
3
/min. Before commissioning,
1
/
turn.
6
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