English (GB)
11
7. Adjustment
The JP Booster PT comes with the following factory
settings in bar:
7.1 Calculating the cut-in and cut-out
pressures
The cut-in pressure is the sum of these variables:
•
required minimum pressure at the highest
tapping point
•
head
from the pump to the highest tapping point
•
pressure loss in pipes.
Recommended cut-out pressure:
cut-in pr 1.0 - 1.5 bar.
7.2 Adjusting the precharge pressure
When the pump cut-in pressure has been
determined, the required precharge pressure of the
diaphragm tank can be calculated. The precharge
pressure must be adjusted to 90 % of the cut-in
pressure.
See the installation and operating instructions for the
diaphragm tank.
7.3 Setting the pressure switch
The cut-out pressure must be lower than the
maximum operating pressure of the pump and tank.
Remove the cover from the pressure switch to
access the adjusting screws. See fig. 4.
Fig. 4
Pressure switch
Setting the cut-out pressure
1. Turn screw (pos. A) clockwise to increase the
cut-out pressure.
Turn it counter-clockwise to reduce the cut-out
pressure.
The differential pressure range remains
unchanged.
2. Start the pump and check by reading the
pressure gauge whether the desired cut-out and
cut-in pressures have been obtained.
Setting the cut-in pressure
1. Turn screw (pos. B) clockwise to reduce the
cut-in pressure.
Turn it counter-clockwise to increase the cut-in
pressure.
The differential pressure range is widened and
narrowed respectively.
2. Start the pump and check by reading the
pressure gauge whether the desired cut-out and
cut-in pressures have been obtained.
Repeat the procedure until the right cut-in and
cut-out pressures have been obtained.
Pump
Tank
precharge
pressure
Cut-in
pressure
Cut-out
pressure
JP 5 & 6
1.9
2.2
3.3
Note
The cut-out pressure must not exceed
the maximum discharge pressure of the
pump.
Caution
When adjusting/reading the precharge
pressure, make that there is no water
pressure on the diaphragm tank from
the pipework.
Note
If the pressure switch setting is
changed, the precharge pressure must
be adjusted too.
Warning
Switch off the power supply before
adjusting the pressure switch.
Fit the cover on the pressure switch
before you switch on the power supply
to check the cut-in and cut-out
pressure.
TM
01
69
14
37
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