Grundfos LS 100-80-241, Service Instructions Manual

Page: 5 / 48

English (GB)
5
3. Servicing the product
3.1 Contaminated pumps
The product will be classified as contaminated if it has been used
for a liquid which is injurious to health or toxic.
If you request Grundfos to service the product, contact Grundfos
with details about the liquid before returning the product for
service. Otherwise, Grundfos can refuse to accept the product for
service.
Any application for service must include details about the liquid.
Clean the product in the best possible way before you return it.
Costs of returning the product are to be paid by the customer.
3.2 Operating checks
1. Check the pump and pipes for leaks.
2. Check and record the pressure gauge readings for future
reference.
3. Check the differential pressure. If the differential pressure is
lower than anticipated, the motor may be overloaded. We
recommend that you install pressure gauges on the pump
inlet and outlet flanges.
4. Measure the motor current consumption and compare the
result with the rated current stated on the motor nameplate. In
case of overload, throttle the outlet isolating valve or throttle
valve until the motor is no longer overloaded.
5. Check the bearings for lubrication and temperature. Normal
temperature is 70 °C (158 °F). The maximum temperature
depends on the type of lubrication. See the lubricating plate
on the pump.
Stop the pump immediately if you notice any defects.
Do not start the pump unless the defects have been remedied.
See section
7. Identification
. Report immediately to the supplier
that you cannot remedy the defects.
3.3 Maintaining the product
3.3.1 General information
Routine maintenance is essential to maintain the pump in a good
condition.
A high degree of cleanliness must be maintained during all
maintenance procedures.
3.3.2 Frequency of inspections
Carry out inspections in accordance with the maintenance table
below.
Depending on operating and environmental conditions together
with a comparison of previous inspections, the frequency of
inspections may be altered to maintain satisfactory operation of
the pump.
Between the regular maintenance inspections, be aware of signs
of motor or pump trouble.
Common symptoms are listed in section
7. Identification
.
Remedy any fault immediately and avoid costly repairs and
shutdowns.
CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the pump thoroughly with water and rinse
the pump parts in water after dismantling.
CAUTION
High sound pressure level
Minor or moderate personal injury
- Use hearing protection.
The operating checks apply both during the startup
procedure and when checking the pump during
normal operation.
DANGER
Electric shock
Death or serious personal injury
- Before starting work on the pump, make sure that
the power supply has been switched off and that it
cannot be accidentally switched on.
WARNING
Hot or cold surface
Death or serious personal injury
- Pay attention to the direction of the vent hole, and
ensure that the escaping water does not cause
injury to persons or damage to the motor or other
components.
- In hot-water installations, pay special attention to
the risk of injury caused by scalding hot water and
hot surfaces.
- In cold-liquid installations, pay special attention to
the risk of injury caused by cold liquids and cold
surfaces.
Every
week • Visually check for leaks.
• Check for vibrations.
• Hand test the bearing housing for any sign of
temperature rise.
• Check correct leaking from the stuffing boxes
(approximately 40-60 drops per minute).
Every
month • Check the pump bearing temperature.
Every 6
months • Check the shaft for scores.
• Check the alignment of the pump and motor.
• Check the fixing bolts and tighten, if necessary.
• Check the coupling for wear.
Every year • Check whether the grease in the pump bearings
has hardened.
• Check the rotating assembly for wear.
• Check the wear ring clearances.
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective gloves to protect yourself against
sharp edges on the impeller and wear rings.