Three-Yearly Check; Ten-Yearly Check Ten-Yearly Check; Regulating The Set; 12.1. Calibration Of The Pressure Switches - DAB 1 KVT Instructions Pour L'installation Et La Maintenance

11.6.

THREE-YEARLY CHECK


Check for corrosion outside and INSIDE the tanks, repairing the protection if necessary.

Check the interception and check valves, replace them if necessary.
11.7.

TEN-YEARLY CHECK TEN-YEARLY CHECK

After no more than 10 years, clean all the tanks and check the internal structure.
12.

REGULATING THE SET

12.1. CALIBRATION OF THE PRESSURE SWITCHES

Standard EN 12845 – UNI 10779 contemplates two pressure switches for each pump, each pressure switch with
normally closed contacts connected in series.
Opening any one of the two pressure switches causes the pump to start.
For pressure switch settings different from those made in the factory, proceed in accordance with the following
instructions during handover testing of the pumping set:

the type of pressure switch installed in the pump set,

the pressure limits indicated on the data plates of each pump,

the limit indicated by standard EN 12845 – UNI 10779 according to which the two pressure switches must be
calibrated in such a way as to start the pump at a value pump pressure with delivery closed x 0.8.

In the case of sets with two pumps, the second pump will be started at a value pump pressure with delivery
closed x 0.6.
Danfoss pressure switch type KP
Slacken the 2 screws and remove the cover.
Unscrew the locking screw above the regulating screws.
Set the upper pressure limit on the START-STOP regulating
scale (marked RANGE), turning the cross-headed screw.
Then set the lower pressure limit using the differential scale
(marked DIFF), turning the hexagonal head screw.
Re-tighten the locking screw.
Replace the cover and tighten the 2 screws.
Klockner Moeller pressure switch type MCS
Undo the 4 screws and remove the cover.
Slacken and remove the locking screw "B" positioned in one
of the 12 holes in the regulating knob "A". (figure 1)
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. (figure
2)
When the regulating knob "A" is pressed and turned counter-
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 the regulating knob "A" is pressed and turned
clockwise, the differential is decreased. (figure 3)
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. (figure 4)
Replace the cover and tighten the 4 screws.
13. CALIBRATION OF THE PRESSURE SWITCHES
13.1. The pump sets can be supplied with the compensation pilot pump accessory, to be connected to the delivery manifold.
Instead the suction, as in any pump of a set according to standards EN 12845 – UNI 10779, is kept independent.
13.2. Keep the pressure switch that controls the compensating pump always calibrated with starting and
stopping pressures higher than the others. This is indispensable in order to allow this pump to perform its
task of compensating small falls in pressure in the system before starting the main electropumps and
motor pump.
ENGLISH
Start/Stop
(RANGE)
57
Differential
(DIFF)