Instructions For Running The Set; Regulating The Set; Calibration Of The Pressure Switches - DAB PUMPS 1-2-3 K 55/200 T Manual Del Usuario

6.

INSTRUCTIONS FOR RUNNING THE SET

6.1. Each pump in the set should not be started more than 20 times in one hour to avoid subjecting the motor
to excessive thermal stress.
6.2. If the set should remain inactive for long periods, periodically perform manual starting of the set to check
its state of efficiency.
6.3. When the set remains inactive for long periods at a temperature below 0°C, it must be drained
completely. (fig.8)
6.4. At least every 4-6 months, with the system empty, check the preloading of the aquaboxes, ensuring that
it remains 0.2-0.3 bar below the lowest of the starting pressures of the electropumps. The frequency of
this check must be increased, the greater the frequency of starting and the maximum working pressure of
the set.
7.

REGULATING THE SET

7.1.

CALIBRATION OF THE PRESSURE SWITCHES

If you wish to obtain a calibration of the pressure switches different that from that performed in the factory, during
testing of the booster set, follow the instructions below, considering:
- the type of pressure switch installed in the booster set;
- the pressure limits indicated n the data plates of each pump;
- the preloading of the aquaboxes.
Telemecanique pressure switch type XMP (fig.9)
Slacken the black screw and remove the cover.
When the metal screw "A" in the centre of the pressure switch is turned clockwise, the pump starting and stopping
pressures are increased at the same time.
When it is turned counter-clockwise they are decreased.
When the black screw "B" at the end of the pressure switch is turned clockwise, the differential between the starting and
the stopping pressure of the pump is increased (the starting pressure decreases while the stopping pressure remains
fixed).
When it is turned counter-clockwise, the differential is decreased.
Replace the cover and tighten the black screw.
Klockner Moeller pressure switch type MCS (fig.10)
Slacken the 4 screws and remove the transparent cover.
Slacken and remove the locking screw "B" positioned in one of the 12 holes in the regulating knob "A". (fig. 10/I)
When the regulating knob "A" is turned clockwise, the pump starting and stopping pressures are increased at the same
time.
When it is turned counter-clockwise they are decreased.
When the regulating knob "A" is pressed to the bottom and turned counter-clockwise, checking that the screw "C" does
not turn, the differential between the starting and the stopping pressure of the pump is increased (the starting pressure
decreases while the stopping pressure remains fixed). (fig. 10/II)
When the regulating knob "A" is pressed and turned clockwise, the differential is decreased.
Replace and tighten the locking screw "B" in the hole in the regulating knob "A" that is most aligned with one of the
two threads under the knob.
Replace the transparent cover and tighten the 4 screws.
Once the pressure switches have been recalibrated, to check the new starting and stopping pressures of the pumps in the
booster set, perform the procedure " Checking calibration of the pressure switches" described on page 24.
In sets with 2 or 3 pumps, it is advisable to keep the control pressure switch of pump No. 1 set with starting and
stopping pressures greater than those of pump No. 2; and, in sets with 3 pumps, also the control pressure switch
of pump No. 2 set with starting and stopping pressures greater than those of pump No. 3.
ENGLISH
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