DAB 1 NKV EN Instrucciones Para La Instalación Y El Mantenimiento página 30

 Check for any changes in the system, changed class of risk, etc.
 Check sprinklers, pipes, pipe supports (see EN 12845 point 20.3.3.2 – UNI 10779).
 Start the pumps and check the pressure and the flow rate.
 Check the operation of any generators – generating sets.
 Check the correct position of the interception valves.
 Check the correct operation of the secondary electric power supply coming from Diesel generators.
6.4. HALF-YEARLY CHECK (at intervals of no more than 6 months – see EN 12845 point 20.3.3 – UNI 10779)
 Check the dry alarm valves (in the system).
 Check the operation of the alarms in the control room and/or at the Fire Station.
6.5. YEARLY CHECK (at intervals of no more than 12 months – see EN 12845 point 20.3.4 – UNI 10779)
 Check the pressure and the flow rate of the pumps against the values given on the technical data plate.
 Check the alarm for failed starting of the Diesel motor pump according to EN 12845 point 10.9.7.2 – UNI 10779.
(make the six attempts to start alternately on the two batteries).
After the six attempts, check that the following are activated on the electric panel:
- the failed start warning light,
- the failed start alarm contact.
Straight after testing, restart the motor immediately with the manual test button "OPERATE MANUAL START".
 Check the operation of the float valves and the filters in the tanks.
6.6. THREE-YEARLY CHECK
 Check for corrosion outside and INSIDE the tanks, repairing the protection if necessary.
Check the interception and check valves, replace them if necessary.

6.7. TEN-YEARLY CHECK
After no more than 10 years, clean all the tanks and check the internal structure.
7. REGULATING THE SET
7.1. CALIBRATION OF THE PRESSURE SWITCHES
Standard EN 12845 – UNI 10779 contemplates two pressure switches for each pump, each pressure switch with
normally closed contacts connected in series.
Opening any one of the two pressure switches causes the pump to start.
For pressure switch settings different from those carried out in the factory, proceed in accordance with the following
instructions during handover testing of the pumping set:
 the type of pressure switch installed in the pump set,
 the pressure limits indicated on the data plates of each pump,
 the limit indicated by standard EN 12845 – UNI 10779 according to which the two pressure switches must be
calibrated in such a way as to start the pump at a value pump pressure with delivery closed x 0.8.
 In the case of sets with two pumps, the second pump will be started at a value pump pressure with delivery
closed x 0.6.
Danfoss pressure switch type KP
Slacken the 2 screws and remove the cover.
Unscrew the locking screw above the regulating screws.
Set the upper pressure limit on the START-STOP regulating
scale (marked RANGE), turning the cross-headed screw.
Then set the lower pressure limit using the differential scale
(marked DIFF), turning the hexagonal head screw.
Re-tighten the locking screw.
Replace the cover and tighten the 2 screws.
ENGLISH
Start/Stop
(RANGE)
26
Differential
(DIFF)