English
24
WILO SE 07/2013
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.
8.5
Leak check
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
3
/min. Before commissioning,
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.
1
/
6
turn.
• 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.
