Checking Operation Of The Automatic Inverter Se2 - Se3; Instructions For Running The Set; Regulating The Set; Calibration Of The Pressure Switches - DAB 2 JET 102 M Installationsanweisung Und Wartung

5.7. CHECKING OPERATION OF THE AUTOMATIC INVERTER SE2 (FOR SETS WITH TWO PUMPS) - SE3 (FOR
SETS WITH THREE PUMPS).
a) Turn the AUT-0-MAN selector of pump No.1 to AUT and the selector of pump No. 2 (and No. 3 for sets with three
pumps) to 0.
b) Partly turn on the flow at delivery and wait for pressure switch No. 1 to give the command to start pump No. 1.
c) Turn off the flow.
d) Turn the AUT-0-MAN selector of pump No.2 to AUT and the selector of pump No. 1 (and No. 3 for sets with three
pumps) to 0.
e) Partly turn on the flow at delivery, checking that, in this second case, at the starting pressure of pump No. 1 the
automatic inverter SE2 (or SE3 for sets with three pumps) starts pump No.2.
f) Turn off the flow.
g) Finally, in sets with three pumps, turn the AUT-0-MAN selector of pump No. 3 to AUT and the selectors of pumps
No. 1 and No. 2 to 0.
h) Partly turn on the flow at delivery, checking that, in this case, at the starting pressure of pump No. 1 the automatic
inverter SE3 starts pump No. 3.
i) Turn off the flow.
Once the above control has been completed:
Reposition all the AUT-0-MAN selectors of the main pumps in position AUT.
To test CASCADE operation of all the pumps, completely turn on the flow so as to bring the pressure down below the
starting pressure of the second pump (for sets with two pumps) or of the third pump (for sets with three pumps). In this
case all the pumps in the set start at intervals of about 0,4 seconds from one another.
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.
ENGLISH
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