5.3.1 Maintenance of black water draining system

Component Maintenance Notes and precautions
Black water tank Rinse the tank
(at least once a month)		 Fill the tank with clean water and empty it two or three times. It is advisable to periodically pour a sterilizing product into the toilet drain in order to prevent the formation of bacteria and associated unpleasant odours.
CAUTION

Should deodorants or disinfectants be used, avoid abrasive substances or acids, because they could damage tubes and seals.

CAUTION

In case of need, break or pollution of the tanks, they can be replaced. Contact the RIVA After Sales & Service Department.

MAINTENANCE

At least once a week check the correct operation of the:

  • Toilet;
  • Waste water pump.

At least once every 3 months check the condition of the pipes and fittings.
At least once every 6 months treat with special protective products:

  • The toilet solenoid valves;
  • The waste water pump.

Thoroughly clean the waste water tank when necessary and at least once a year.
Pump Replacement of impeller and
mechanical seal		 This is a complex operation and should only be undertaken by skilled personnel.
CAUTION

The electric motor may be hot during operation. Pay attention. The electric pump must only be repaired by competent or qualified personnel, using manufacturer’s spares; if this procedure is not followed, the manufacturer is relieved of any responsibility and warranty is void and null.
Operation check and cleaning (at least every month) Electric pumps usually do not need ordinary maintenance, as long as some precautions are taken, which extend their lives (address to the pumps’ Manufacturer).
DANGER

Before each intervention make sure that voltage is disconnected and that there is no possibility of accidental connection.

  • If there is a risk of freezing, it is necessary to empty the pump casing from the liquid and to fill it, before restarting the pump.
  • Make sure that the pump never runs dry.
  • The DC motor brushes must be periodically checked for consumption and spring pressure.
  • If the pump does not work for a long time, it is better to empty the pump casing and clean it.
  • If a filter and a foot valve are installed, check periodically for their efficiency and cleaning.
  • Check that the impeller is jammed, this could cause heavy damages to the electric motor; if this happens, descale the impeller and pump body.
  • At least once a month, have the operation of the grey/black water pumps checked, having their tanks filled with clean water until the pump activates and having the correct overboard draining checked.
Solenoid valve for WC drain Filter Just before each solenoid valve there is an extractable filter, which retains impurities and must be cleaned at least once a month.