Lowara e-HM series, Installation, Operation And Maintenance Manual, Page: 30 / 44

6 Maintenance
6.1 Precautions
Make sure to read and understand the safety instructions before starting work.
WARNING:
Maintenance must be done by a technician possessing the technical-professional
requirements outlined in the current regulations.
WARNING:
Always wear personal protective equipment.
WARNING:
Always use suitable working tools.
WARNING:
In the case of liquids that are excessively hot or cold, pay attention to the risk of injury.
DANGER: Electrical hazard
Before starting work, check that the unit is unplugged and that the pump unit, the control
panel and the auxiliary control circuit cannot restart, even unintentionally.
DANGER: Electrical hazard
If the unit is connected to the frequency converter, disconnect the mains power supply
and wait at least 10 minutes for the residual current to dissipate.
6.2 Maintenance every 4000 hours of operation or every year
When the first of the two limits is reached:
1. Measure the pressure at zero flow rate and compare it with the pressure measured
during initial start-up; if the pressure has decreased by more than 15%, check the
condition of impeller, pump body and wear rings.
2. Check the unit for unwanted noise and vibrations.
3. Check that there is no liquid leaking from the unit or pipes.
4. Check that all the screws and bolts of the unit and pipes are properly fastened.
5. Check that the insulation resistance of the motor is greater than 500 MΩ, applying a
test voltage of 500 Vdc for 1 minute.
6. Check the terminal board of the motor for any signs of overheating and arc flashes.
7. Check the condition of the motor's cooling fan and clean it.
6 Maintenance
28 e-HM Series Installation, Operation and Maintenance Manual