Regulating The Set; Calibration Of The Pressure Switches; Maintenance; Troubleshooting - DAB JET Série Mode D'emploi

6.3
6.4

7. REGULATING THE SET

7.1 CALIBRATION OF THE PRESSURE SWITCHES (only for sets with one or three pumps)
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 expansions vessels.
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 27.
In sets with 3 pumps, it is advisable to set pressure switch No.1 with starting and stopping pressures higher than pressure
switch No.2, and pressure switch No.2 with starting and stopping pressures higher than pressure switch No.3.
Sets with two pumps work by means of a pressure transmitter connected to the E-BOX panel.
To calibrate the pump starting and stopping pressures, see the enclosed instructions booklet for the E-BOX electric panel.

8. MAINTENANCE

8.1 All our sets are subjected to strict testing of both the electrical and the hydraulic part.
It is unusual for malfunctions to occur, unless due to external or completely accidental causes.
8.2

Troubleshooting

Below is a table with some suggestions on regulating the set in the event of irregularities in operation.
When the set remains inactive for long periods at a temperature below 0°C, it must be drained completely. (fig.8)
Each year, with the system empty, check the preloading of the expansion vessels, 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.
ENGLISH
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