Calibration Of The Safety Or Bypass Valve; Optional Accessories; Weekly Test Control Unit - DAB PUMPS 1-2-3 K 55/200 T Manual Del Usuario

7.2. CALIBRATION OF THE SAFETY OR BYPASS VALVE (fig. 11)
If you wish to obtain a calibration of the safety or bypass valve different that from that performed in the factory, during
testing of the booster set, follow the instructions below, considering:
- The calibration of the control pressure switches of the booster set;
- the pressure limits indicated n the data plates of each pump;
- the maximum calibration pressure stamped on the valve.
Unscrew and remove the cap "A".
Slacken the locking nut "B".
Turn the screw "C" clockwise to increase the valve opening pressure, counter-clockwise to decrease it.
To check the new pressure value, perform the procedure " Checking calibration of the safety or bypass valve" described
on page 25.
Secure the locking nut "B".
Screw the cap "A" back on.
8.

OPTIONAL ACCESSORIES

8.1.

WEEKLY TEST CONTROL UNIT

On request, booster sets which may be subject to long periods of inactivity (for example, fire-fighting sets, etc.) may be
supplied with a "Weekly test control unit", a device which allows the pumps to be started automatically at least once a
week, so that the state of efficiency of the booster set is always under control.
This device is fundamentally composed of:
Weekly clock : used to programme the day and time at which the booster set is to perform the weekly operating test in
automatic mode.
Weekly test timer : used to programme the duration of the test time after the consent received from the clock.
This duration must be such as to allow all the pumps in the set to perform at least one start.
Electrovalve : fitted on the delivery manifold of the booster set; it opens as soon as it receives the consent from the
weekly clock, discharges the system pressure, thus provoking starting of a pump which will then put the system under
pressure again.
Since the electrovalve will continue to discharge throughout the period in which the weekly test timer has been
programmed, in the sets with 2 (or 3) pumps, the electric inverter SE2 ( or SE3 ) will later allow starting of the other
pumps too.
The electrovalve is fitted with an interception valve for maintenance and a filter to be checked
periodically to prevent any impurities in the water from damaging it or to provoke incorrect functioning.
Convey the waste water to a suitable place.
Minimum calibration pressure switch: this pressure switch is installed on the delivery manifold of the set and
calibrated at a minimum system pressure, below which it causes intervention of an acoustic alarm.
Generally this pressure switch is calibrated in the factory with an alarm pressure of about 2 bar .
Acoustic alarm: this is a siren, controlled by the minimum calibration pressure switch, which intervenes when the
minimum system pressure is reached.
It is supplied already connected to the special terminals on the panel, with 0.5 m of cable.
It is recommended to position the acoustic alarm in a suitable place where it can be heard by a responsible person,
changing the cable if necessary.
Emergency button : this is a button located inside a locked red box. In the event of necessity, breaking the glass on the
box with the hammer positioned alongside it and pressing the button, all the pumps in the set are started at the same
time, meanwhile a luminous red signal will light up in the box.
Since the emergency button starts the electropumps bypassing all the auxiliary circuit of the electric panel, remember
that:
a)
Once the pumps have been started in this way, they can be stopped only by turning and pulling up the
button.
ENGLISH
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