Operation; Installation - Lowara TKS Series Instructions For Installation And Use Manual

5.

Operation

The converter features a power and control board connected by a cable directly to the terminal
board of the pump's motor. All this is encapsulated between a base and an aluminium casing with
a finned top to ensure heat dissipation. Three warning lights signal the status of the converter:
POWER: Linea ; RUN: Marcia; ALARM: Allarme
A connection via serial interface allows the two variators in the pressure booster unit to converse
with each other and provide for the cyclic starting and stopping of the pumps based on user
demand.
A pressure set point must be established; then, once the unit has been installed, the entire system
will adapt to this value.
The pressure transmitters, located on the delivery side, put out a signal which is proportional to the
system pressure value. The drop in system pressure determined by the users' water consumption
causes a decrease in the value of the signal that, through the variator, starts the first pump,
regulating its speed so as to re-establish the pressure set point (operating pressure).
If the capacity of the pump is lower than the quantity of water drawn, the pressure continues to
drop until the first pump reaches the maximum operating speed and transmits a signal to the
second pump to start.
The first pump continues to run at maximum speed while the second pump modulates its operation
to meet the water demand.
If the pressure increases due to decreased water consumption, the signal from the transmitters
increases causing the pumps to stop (inverted order of the starting sequence)
In order to distribute the working hours and reduce the number of starts per hour of each pump, the
program switches the starting order of the pumps at each start-up.
6.

Installation

The unit must be protected from the weather and especially from freezing temperatures.
The operating conditions described in our catalogue provide for the water to be supplied by a water
storage tank, with the liquid level at the same height as the suction manifold.
Whenever possible, the unit should be installed with a positive suction head, i.e. with the pump
suction port located below the minimum water level.
If the above conditions cannot be ensured the installation is described as suction lift. In this case
the suction flow resistance, suction lift and NPSH of the pumps must be taken into account.
When in doubt, please contact our technical service department.
6
DANGER
RISK OF ELECTRIC
SHOCK
DANGER
RISK OF ELECTRIC
SHOCK
DANGER
DANGER
WARNING
.
WARNING