DAB 1 NKV EN Instructions Pour L'installation Et La Maintenance page 29

5.2. CHECKING OPERATION OF THE COMPENSATING ELECTROPUMP (PILOT PUMP)
The compensating pump (or pilot pump) is an auxiliary pump which intervenes to draw small amounts of water.
It starts at a pressure higher than the starting pressure of the main pumps and stops when the pressure in the system is
restored.
It is not obligatory, but it is recommended in order to avoid needless starts of the main pumps in the case of leaks in the
system.
a) Turn the main switch on the electropump panel to 1 (ON).
To check the direction of rotation of the compensating electropump (or pilot pump), turn its selector to MAN for
a few moments and check that, when viewed from the fan side, the motor is turning in a clockwise direction.
If not, exchange on the terminal board any two leads of the power supply of the panel for the compensating
electropump (or pilot pump).
b) Turn the selector on the electropump panel to AUT position.
c) Turn on a hydrant in the system.
d) Check that the compensating electropump (or pilot pump) starts.
e) Turn off the hydrant.
f) Check that the electropump stops AUTOMATICALLY.
5.3. SETS WITH SEVERAL PUMPS
Standard EN 12845 – UNI 10779 contemplates various solutions with one or more pumps having similar characteristics:
 if TWO pumps are installed, each pump supplies the total flow rate of the system (100%),
 if THREE pumps are installed, each pump supplies 50% of the total flow rate.
Also, in sets where more than one pump is installed with superior or duplicate water supply, only one pump will be
electric (10.2). From this it may be deduced that, in the case of a superior or duplicated supply, the sets will be
composed of:
a)
1 electropump (100%),
b)
1 Diesel motor pump (100%),
c)
1 electropump + 1 Diesel motor pump (each supplies 100%),
d)
1 electropump + 2 Diesel motor pumps (each supplies 50%),
e)
3 Diesel motor pumps (each supplies 50%),
In the case of a single supply, there are no limits to the number of electropumps.
DAB supplies the sets in a "modular" version, in separate units, so as to be able to make up all the versions mentioned above.
By means of the JOINING MANIFOLD (see drawing on page 32) it is possible to join the manifolds so as to obtain a single
delivery manifold.
The intakes, the electric panels, etc. remain separate as contemplated by standard EN 12845 – UNI 10779.
6. PERIODIC MAINTENANCE
The whole fire-fighting system to standard EN 12845 – UNI 10779, including the set of fire-fighting pumps, must always be kept in
perfect working order. For this reason, regular maintenance is of particular importance.
According to standard EN 12845 point 20.1.1 – UNI 10779, the user must:
- carry out a programme of inspections and checks;
- arrange a testing, assistance and maintenance programme,
- document and record the activities, filing the documents in a special register kept in the building.
The user must ensure that the testing, assistance and maintenance programme is carried out under contract by the installer of the
system or by a company with the same qualifications.
6.1. WEEKLY CHECK (to be carried out at intervals of no more than 7 days)
The weekly check of the fire-fighting set to standard EN 12845 – UNI 10779 contemplates checking and noting down the
following values:
 pressure of pressure gauges,
 water level in the tanks – water reserves,
 correct position of the interception valves.
To test the automatic starting of the pumps, proceed as described below:
 Check the levels of the fuel and lubricating oil in the Diesel motors.
 Open the pump manual start valve (ref. 5).
 Check that the pump starts and make a note of the starting pressure.
 Close the manual start valve.
6.2. MONTHLY CHECK
Check the level and density of the acid in all the cells or the starting batteries with a densimeter.
If the acid density is low, check the battery charger and, if necessary, change the batteries.
6.3. QUARTERLY CHECK (at intervals of no more than 13 weeks – see EN 12845 point 20.3.2 – UNI 10779)
ENGLISH
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