Lowara GS Serie Instructions Pour L'installation Et L'emploi page 17

Adjustment of the differential pressure determines the start pressure P.
1 Ps stop pressure
2 Ps-P differential pressure
Electronic Control Card Adjustments
If you need to modify the settings, selector switches (one for each pump) are also found on the card:
these are used to override the electronic control in order to control the pumps directly (position M), or to
disconnect them (position 0).
Tank Precharge
To ensure its proper operation, the membrane tank must be precharged to the minimum activation pres-
sure value of 0.9. The precharge operation must be performed with the tank empty.
6. Start-up
To start the set, proceed as follows:
a) Connect the water supply
b) Connect the power supply
c) Check the tank precharge value
d) Close the pump delivery valves
e) Prime the set ( see pump instructions manual) and suction manifold
f) Make sure all the settings are correct
g) Check the current value set on the switch on the electric panel against the motor rated current
h) Operate the switch on the panel to supply power and select manual mode operation
i) Start the first pump
j) For Three-phase versions, check the rotation direction: if incorrect, swap two power supply phases.
k) Slowly open the pump delivery valve and bleed the air.
l) Repeat the above operations for the other pumps.
m) Select automatic mode operation
How to Modify the Settings
After the set has been started, proceed as follows to modify the settings within the maximum pressure li-
mits of the pumps and/or system:
Version with pressure switch (with two pumps):
a) Determine the P1s deactivation and P1 activation pressure values (P1= P1s- 1 bar)
b) Determine the P2s deactivation and P2 activation pressure values ( P2= P1-0.5 bar)
c) Determine the tank precharge pressure =0.9 x P2
d) Open the delivery and suction valves between the pumps and the manifolds and tanks.
e) Stop the pumps, open the valves on the delivery side and allow the delivery pressure to drop to zero
f) Adjust the tank precharge pressure
g) Close the delivery valves and start the pumps in automatic mode until, having reached the deactiva-
tion value, they stop.
h) Set the P1s and P2s deactivation pressures to the desired values.
i) Set the P1 and P2 activation pressures to the desired values
j) Open the delivery valves in automatic mode to check the values
k) Repeat the above operations until you obtain the desired value.
Version with sensor:
Set the new values on the electronic control board (consult the relative manual).
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