Instructions For Running The Set; Regulating The Set; Calibration Of The Pressure Switches - DAB 2 JET SET Instruction For Installation And Maintenance

CHECKING CALIBRATION OF PUMP CONTROL PRESSURE SWITCHES (only for sets with one pump*)
Partly open the supply on delivery and wait for the pressure switch to start the pump. Check the pressure gauge to ensure
that the starting pressure is as requested.
CHECKING PRESSURE CALIBRATION FOR SETS WITH TWO PUMPS
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.
To change from 0 to AUT, press the buttons P1 and P2.
(*) When turned on only partly the pressure in the system will decrease slowly and gradually, allowing a more
precise reading of the pressure gauge at the time of closing the pressure switch.
(**) If the operating electropump puts the system back under pressure too quickly, partly turn off the interception
valve on the delivery of the pump. In this way the pressure will increase slowly and gradually, allowing a more
precise reading of the pressure gauge at the time of opening the pressure switch.
6.

INSTRUCTIONS FOR RUNNING THE SET

Each pump in the set should not be started more than 20 times in one hour to avoid subjecting the motor to
6.1.
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. 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.
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.
ENGLISH
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