Preliminary Checks; First Start-Up - DG FLOW Preset Manual De Instrucciones

Installation

Preliminary checks

Take the PRESET out of the
packaging and check the
following:
- check for damage,
- check the RATINGS corre-
spond with those required,
- that the cable bushings and
screws are in place,
- that PRESET's inlets and
outlets are clean and free of
any packaging materials,
- that the check valve moves
smoothly.
Hydraulic connections
Orientation
PRESET can be installed at any
angle depending on the flow
direction, as indicated in the
diagrams.
Positioning.
PRESET can be fitted directly
onto the pump outlet in any po-
sition of the delivery line. Never
install taps between the pump
and PRESET. Do not install a
non-return valve between PRE-
SET and the taps, meanwhile
it is possible, although not ne-
cessary, to install a non-return
valve on the suction piping of
the pump.
NOTE 1 - DRY RUNNING = there is no flow and the pressure is
lower than that of the pump start-up pressure (Pm).
It occurs when there is no water. PRESET controls the flow according
to the pressure and must be set with an operating delay that allows
the pump to prime. After the programmed interval, the pump is
stopped and a fault is signalled. The operating delay is set with the
TD parameter. The TP parameter defines the interval between the
attempts to return to normal operation. If PRESET reads pressure
and/or flow rate, it returns to normal operation, otherwise it stops the
pump again until the next attempt. An attempt to return to normal
operation can always also be made manually.
NOTE 2 - FREQUENT START-UP = the repeated stopping and star-
ting of the pump at intervals of less than 2 minutes from each other.
This occurs when the flow rate is less than 1- 2 litres/min.
This may cause damage to the pump. In the event of leak or
extended use at low flow rates (less than 1 - 2 litres/min), the pump
may be started/stopped as often as once every few seconds, putting
the pump at risk of damage. In this case, after about 30 minutes,
PRESET stops the pump for the following 30 minutes (in order to let
Electrical connections
The electrical connections
should be made as indicated
in the diagram which can also
be found on the inside of the
circuit cover.
Attention
The cable bushings and circuit
board cover must be properly as-
sembled and secured in order to
guarantee IP 65 grade protection
of the electrical components.
Attention
The pressure applied by
the water column above
PRESET must not exceed that
of the pump start-up pressure (
Pm ). If, for example, PRESET is
installed at a height 20 metres
below that of the highest tap in
the system, the pressure de-
tected by PRESET will be appro-
ximately 2 bar. A model with Pm
= 2.5 bar should, therefore, be
installed in order to guarantee
that the pump is started when a
tap is turned on.
Attention
The maximum pressure
produced by the pump
must be at least 1 bar higher
than the stop pressure (Pa). If
the pressure produced by the
pump is too low, PRESET will
stop the pump and indicate a
'dry running' error message.
Motor
Line
Nut
Seal
Cable bushing
it cool down) and indicates an ERROR message. If the time interval
between the starts-stops is more than 10 seconds (and therefore
poses less of a risk to the pump), PRESET will allow the pump to be
used for more than 30 minutes. Once that enough time has passed
to allow the pump to cool down it is restarted AUTOMATICALLY. The
pump may be restarted MANUALLY any time.
NOTE 3 - OVERCURRENT = electric absorption of the pump (in
Ampere) exceeding the max. allowed (I max).
By means of the configuration, it is possible to set the max. current
allowed (I max).
During the start-up phase of the pump PRESET allows for a few
seconds the current to exceed the Imax value. If the absorptions
remain above the set Imax value, PRESET stops the pump to avoid
damaging the motor and signals an anomaly. PRESET will not auto-
matically restart the pump. The pump may be MANUALLY restarted
at any moment. Should the problem persist an anomaly will again be
signalled. The manual restart can be repeated several times since
PRESET does not limit the number of attempts.

First start-up

Priming the pump
For instructions on how to
prime (fill) the pump, see the
pump manual.
Attention
PRESET is fitted with a check
valve: do not use the PRESET's
outlet to fill the pump for
priming.
Switching on the pump.
The LCD displays the MODEL,
then the red (Power) LED lights
up and the system pressure is
displayed. If this is lower than
the RP, the pump starts-up (the
green Status LED lights up).
POWER
P 3_2
STATUS
POWER
dray
STATUS
If within 15 seconds from the
start-up of PRESET the correct
priming is not detected, the
pump is stopped due to a dry
running anomaly.
Attention
When the pump is
started for the first
time, it may have to be run for
longer in order to complete the
priming procedure.
Press the
START/STOP
button to restart
the pump and complete
the priming procedure.