en
Maintenance
28
WILO SE 2020-12
Pump with diesel motor
Before carrying out the test, make sure that the return circuit in the tank is closed and
that the pressure in the main circuit is sufficient to prevent accidental starting of the
pump.
Start the system using one pressure switch at a time in order to check the correct oper-
ation of both pressure switches. See Fig. 10: Close valve 2 and open valve 1 to carry out
the test. Close valve 1 and open valve 2 to end the test and restore the pressure in the
circuit. Then follow the instructions on the pump’s switchgear to check the correct
functioning of the automatic mode.
CAUTION
Material damage due to overheating!
To avoid overheating that could damage the main pumps, always check that the wa-
ter flow through the recirculation circuit meets the requirements of the pump data
sheet. In case of problems with the recirculation circuit, or if the minimum level used
to check the starting and operation of the pumps is not guaranteed, open other cir-
cuits (e.g. flow meter, leak test valve of the shut-off valve, drain valve, etc.).
Automatic start test with float switch (diesel pump)
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Empty the priming tank (or simulate the effect) to start the electric pump via the
float switch signal.
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Then follow the instructions on the pump’s switchgear to check the correct opera-
tion of the pump.
CAUTION
Incorrect pressure level can result in a fault!
If the system pressure does not return to the starting level of the main pump pres-
sure switches, please refer to the chapter on the switchgear for the manual start of
the pump.
8
Maintenance
See Annex A for maintenance.
The fire-fighting system is a safety equipment that protects objects and people, there-
fore any modifications and repairs that affect its efficiency must be carried out in such a
way as to minimise the state of "out of order".
Isolate the pumps one at a time by means of the selection switches on the switchgear
and the appropriate shut-off valves.
DANGER
Risk of fatal injury due to electrical current!
Do not remove the protection of live parts. Prevent any possibility of operating the
elements insulating the system or the subassemblies on which maintenance is to be
carried out.
DANGER
Risk of fatal injury due to electrical current!
When working with one of the switchgear doors open, the input terminals of the
power supply line and those for remote alarm transmission may still be live, even
after opening the main switch-disconnector.
