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4. START-UP
4.5. Regulation of pressure switches
c) Set one of the pump selector switches to the -MAN- position, run one of the pumps until the pressure at
which you want all pumps to stop is reached (usually 0.5 bar above the set pressure), close the delivery valve
and return the selector switch to the -0- position.
d) On each of the pressure switches, slowly turn the screw "P" in the corresponding direction to lower the
stop pressure until you hear a slight metallic "click" produced by the opening of the contacts. At this point
the automatic stop pressure of the pumps has been set.
e) Opening the delivery valve, lower the pressure until the desired start pressure of the first pump is
reached, then close the valve again. It is recommended that this pressure be 1.0 to 1.5 bar below the
automatic stop pressure..
f) At pressure switch P1 (applies to GPM and GPT* on-off boosters) slowly turn the differential pressure nut in the
corresponding direction to reduce the pressure difference between start and stop until a slight metallic "click" is
heard again. The automatic start pressure of the first pump is now set.
g) By opening the delivery valve again, lower the pressure until the desired start pressure of the next
pump is reached, close the valve and readjust the pressure switch as described in the previous point. It is
recommended that this pressure be 0.5 bar below the starting pressure of the previous pump. Repeat this
step as many times as there are auxiliary pumps, so that the starting pressures are staggered.
H (m)
Pp1
Pp2
Pa1
Pa2
1 pump
2 pump
0
To check the correct operation of the equipment, set the pump selector switches one by one to the "automatic"
(AUT) position. Slightly open the valve of the distribution network to check the automatic start and stop
pressures of each pump. When this test is completed, close the valve and set all the selector switches on the
pumps to the "0" position.
This method can subsequently be adjusted to the particular conditions of each installation by slightly changing
the start and stop pressures of each pressure switch.
*See FIGURE 6 in Annex.
**See FIGURE 4 in Annex.
Pp3
Pd
Pa3
3 pummp
Pa1 = Pump start pressure nº1
Pp1 = Pump stop pressure nº1P
d1
d2
a2 = Pump start pressure nº2
Pp2 = Pump stop pressure nº2
P
G
Pa3 = Pump start pressure nº3
Pp3 = Pump stop pressure nº3
d1=d2=Difference between pressure switches (0.5 Bar p.e)
ΔPd = Difference between pressure switches (1.5 Bar p.e)
ΔPG = Total difference of the set
-EN/14-
EN
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