Service - Grundfos Medium UPM Series Data Booklet

10

10. Service

DANGER
Electric shock
▲ Death or serious personal injury
► Before starting any work at the pump, switch
off the power supply. Make sure that the
power supply cannot be switched on
accidentally.
► Be aware that capacitors will be live up to 30
seconds after the power supply has been
switched off.
DANGER
Electric shock
▲ Death or serious personal injury
► Before dismantling the complete pump set,
switch off the power supply at least 5 minutes
prior to commencing work and ensure that it
cannot be switched on again unintentionally.
DANGER
Electric shock
▲ Death or serious personal injury
► When running in reverse, the pump acts as a
generator and creates hazardous induction
voltage at the motor terminals.
► Prevent the fluid from flowing back by closing
the shut-off valves.
WARNING
Strong magnetic field in the rotor area
▲ Danger of death for persons with pacemaker.
► Keep a safety distance of at least 0.3 m
during disassembly.
WARNING
Toxic material
▲ Death or serious personal injury
► Decontaminate pumps which handle fluids
posing a health hazard.
CAUTION
Hot surface
▲ Minor or moderate personal injury
► Before starting to work on the pump, let the
pump casing cool down to ambient
temperature.
All service work must be carried out by
an instructed service technician.
Before dismantling the pump, drain the
system, or close the isolating valves on
either side of the pump.
32
Maintenance
Medium UPM pumps are maintenance-free. However,
it might be necessary to deblock or to open the pump,
for example if it is blocked by impurities.
Deblocking is possible by opening the deblocking
screw at the front.
1. Unscrew the deblocking screw at the front of the
pump head.
– Be aware of splashing hot water.
2. Deblock the pump with a screwdriver.
Cleaning
If the impeller or pump housing has to be cleaned from
impurities, proceed as follows:
1. Drain the system or close the isolating valves.
– Be aware of hot water.
2. Remove the screws that hold the pump head.
3. Check impeller and pump housing and remove the
impurities.
4. Place the pump head in the desired position, fit the
screws and tighten the screws securely.
Medium UPM