15
MDR/EN (0909) 1.0
4.3 Start up
•
Prime pump
When operating with lift, prime and work out all air.
Note!
Pump must not be run without liquid – not even for a short time. When
pumping liquids that are easily flammable, no air is allowed in the system. This
is absolutely necessary in order to avoid that static electricity is generated in
the pump which may cause sevre personal and material damage.
•
Check rotation
Open the suction valve and close discharge valve.
Check the rotation of the pump by turning the pump on briefly
once. Make sure that
the motor rotates in the correct direction (see rotation arrow on the pump body).
•
Starting
When the pump has been started, open the discharge valve slowly and check the
pressure, temperature and flow. Make sure that the piping is properly sealed and that
the pump functions satisfactorily. If not, follow the trouble shooting chart (see section
6.0) or contact yourlocal distributor.
Do not run against closed valve for more than 3 minutes.
When returning a pump for repair, investigation or other reason, it must be cleaned and
wrapped up in a proper way. Documentation stating pumped liquid, operating conditions,
your own opinion of fault/failure reason and your contact person must be included in the
pump package. Also contact the consignee before returning the pump.
4.4 Routine control
• To avoid problems, regularly check pump noise, vibration, capacity, pressure gauge,
motor amperage draw, etc.
• Check impeller bearings for wear after 1 to 2 months of operation.
• Decide the control intervals according to wear and bearing diameter.
Diameter of impeller bearing
Replace the impeller at the following inner diameters:
MDR45
7.25 mm
MDR75
10.35 mm
MDR85
10.35 mm
MDR105
15.50 mm
MDR116
15.50 mm
• If the impeller bearings only are replaced, they have to be reamed jointly to the
following diameters after assembly:
MDR45
7.10 ± 0.05 mm
MDR75/85
10.16 ± 0.04 mm
MDR105/116 15.21 ± 0.04 mm
• Check wear on the ceramic shaft and the ceramic wear plates.
Replace when necessary.
• If the pump will be stopped for a long time, drain and clean the interior of the pump.
