Service; Maintaining The Product; Cleaning; Storing The Product - Grundfos UPM3 Installation And Operating Instructions Manual

9. 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 before beginning
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 genera-
tor and creates hazardous induction voltage at the mo-
tor terminals.
‐
Prevent the fluid from flowing back by closing the shut-
off valves.
WARNING
Electric shock
Death or serious personal injury
‐
In case of an insulation fault, the fault current may be
a pulsating DC. Observe national legislation about re-
quirements for and selection of Residual Current De-
vice (RCD) when installing the pump.
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 disas-
sembly.
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 cas-
ing cool down to ambient temperature.
All service work must be carried out by an instructed serv-
ice technician.
Before dismantling the pump, drain the system, or close
the isolating valves on either side of the pump.

9.1 Maintaining the product

The 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.
CAUTION
Pressurised system
Minor or moderate personal injury
‐
Be aware of splashing hot water.
2. Deblock the pump with a screwdriver.
18

9.2 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.
CAUTION
Pressurised system
Minor or moderate personal injury
‐
Be aware of splashing 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.

10. Storing the product

• Observe the permissible ambient conditions.
• Observe the permissible storage temperature: -40 to +75 °C.
• Protect the storage location from rain, humidity, condensation,
direct sunlight and dust.
• Maximum storage time (without power supply): 2 years from
delivery.
Related information
12.1.1 Ambient and liquid temperature