DGFLOW PRESFLO User Manual

10183307A_rev.02

0 50 100 150 200 l/min

0 5 10 15

m H

2

O

PRESFLO

CODE:
V / Hz:
I max:
P start:

B

50066/115
~230 / 50 - 60
16 A

1.5 Bar

SN 15060002

CODE:
V / Hz:
I max:
P start:

B

50066/115
~230 / 50 - 60
16 A

1.5 Bar

SN 15060002

RUEN FR DEIT ES

ELECTRONIC PUMP CONTROLLER

PRESFLO

®

is a device that
starts and stops the pump to
which it is tted, thus replacing
traditional pressure switch /
surge tank systems.
The pump is started when, as
a tap is turned on, the pressure
within the system drops below
the “start-up pressure” (Pm),
and is stopped when the ow

USER’S MANUAL

rate required is zero or less
than the “shut-off ow rate”
(Qa).
PRESFLO

®

’s electronics protect
the pump against unsuitable
operating conditions such as
dry running or repeated start­ups due to leaks.

Technical specications

Operating conditions

A. Compatible/non compa­tible uids

PRESFLO

®

is suitable for use
with clean water and chemical­ly non-aggressive liquids. If the
uid contains impurities, a lter
should be tted upstream.

B. Environmental conditions

PRESFLO

®

should not be used
where there is the risk of an
explosion. The temperature
of the location should range
between 0°C and 40°C, and
the humidity should not exceed
90%.

C. Power supply

Make sure that the variation

in the power supply is never
more or less than 10 % of the
RATING value.
Higher values may cause

damage to the electronic
components.
PRESFLO

®

can only be used

with single-phase pumps.

Working area

Flow rate

Pressure

Shut-off ow rate

Start-up pressure

2 l/min (0,5 gpm)

Red =

Blue =

Yellow =

Qa

Pm

Safety regulations

Before installing or using
PRESFLO

®

, read this manual
carefully and thoroughly.
The pump should be installed
and serviced by qualied per­sonnel, responsible for making
the hydraulic and electrical
connections in compliance with
the relevant regulations.
DGFLOW

®

shall not be held lia­ble for any damage relating to,
or resulting from, an improper
use of the product, or for any
damage relating to, or resulting
from, servicing or repairs carri­ed out by unqualied personnel
and/or with non-OEM spare
parts.
The warranty, which is valid
for 24 months from the date
of purchase, will no longer be
applicable should the product
suffer damage as a conse­quence of the use of non-OEM
spare parts, tampering or
improper use.
When starting the installation,
check the following:

- the power supply is switched
off.

- the power lines can withstand
the maximum current.

- the cable bushings and circuit
board cover have been properly
assembled and secured ( see
Electrical Connections ).

- Power supply network must
be tted with proper protection
device (fuse or magneto­thermal relay) upstream of
PRESFLO

®

When servicing the product,
check the following:

- the system is not pressurised
(turn a tap on)

- the power supply is switched
off.

Emergency Stop

When in use, the pump can
be stopped in the event of an
emergency:
press STOP/RESTART.

PRESFLO

®

is put STAND-BY.

Never disassemble

water accumulator

Water accumulator

Losses

- Voltage: ~230 Volt / ~115 Volt

- Frequency: 50-60 Hz

- Current: 10A, max 12A for 3 sec.

- Current: 12A, max 16A for 3 sec.

- Protection grade: IP 65

-

Start-up pressure (Pm):

0,8/1,5/2,2 bar

(12/22/32 psi)

- Shut-off ow rate (Qa): 2 litres/min (0,5 gpm)

- Connections: 1” BSP / 1” NPT

- Maximum working pressure: 10 bar (145 psi)

- Bursting pressure: 40 bar (580 psi)

- Weight: 650 g

- Protection against:

- dry running (automatic restart)

- repeated start-ups

- Max room temperature: 40°C

- Max liquid temperature: 55°C

- Type of drive: 1C

- Max manual operations on
push button: 1000

- Max automatic operations
on relay: 100000

- Class 3A PTI

- Pollution degree : 2

- Max rated voltage pulse: 2,5 kV

- 230V 12A for EMC test

- Pressure operating
differential: 10 bar

Before installing,
the product, check that
the RATINGS correspond
with those required.

2,2 bar (32 psi)
1,5 bar (22 psi)
0,8 bar (12 psi)

Preliminary checks

Take the PRESFLO

®

out of
the packaging and check the
following:

- check for damage,

- check the RATINGS corre­spond with those required,

- that the cable bushings and
screws are in place,

- that PRESFLO

®

’s inlets and
outlets are clean and free of
any packaging materials,

- that the check valve moves
smoothly.

Hydraulic connections

the joint in two pieces allows
rapid connection to the system.
DO NOT apply sealant inside the
2-piece joint because it already
has an internal o-ring.

Orientation

PRESFLO

®

can be
installed at any angle
depending on the
ow direction, as
indicated in the diagrams.

Position

PRESFLO

®

can either be tted
directly to the pump outlet or
anywhere along the delivery
line. Never install taps between
the pump and PRESFLO

®

. Do
not install a non-return valve
between PRESFLO

®

and the
taps, meanwhile it is possible,
although not necessary, to in­stall a non-return valve on the
suction piping of the pump.

Installation

Red =

Blue =

Yellow =

Attention

The pressure applied
by the water column above
PRESFLO

®

must not exceed
that of the pump start-up
pressure (Pm). If, for example,
PRESFLO

®

is installed at a
height 15 m (50 ft) below that
of the highest tap in the sy­stem, the pressure detected by
PRESFLO

®

will be approxima­tely 1.5 bar (22 psi). A model
with Pm = 2.2 bar (32 psi)
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 (15 psi) higher
than the start-up pressure
(Pm). If the pressure produced
by the pump is too low,
PRESFLO

®

will stop the pump
and indicate a ‘dry running’
error message.

First start-up

Priming the pump

For instructions on how to
prime (ll) the pump, see the
pump manual.

Attention

PRESFLO

®

is tted with a
check valve: do not use the
PRESFLO

®

’s outlet to ll the
pump for priming.

Switching the pump on

The red (Power On) LED lights
up; PRESFLO

®

instantly detects
that there is no pressure within
the system and
starts the pump
(the green
‘Pump On’ LED lights up).
If, within 15 seconds of starting
up, PRESFLO

®

does
not detect the
correct priming of
the pump, it stops the pump
and indicates a ‘dry running’
error message.

Attention

When the pump is star­ted for the rst time, it

may have to be run for
longer in order to complete the
priming procedure.

Press the
STOP/RESTART
button

to restart the
pump and
complete the
priming procedure.

Motor

Line

Nut

Seal

Cable bushing

Attention! The cable
bushings and circuit board
cover must be properly
assembled and secured
in order to guarantee IP
65 grade protection of the
electrical components.

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.

NOTE 1 - DRY RUN PROTECTION = there is no ow and the
pressure is lower than that of the pump start-up pressure (Pm).
It occurs when there is no water. After 15 seconds PRESFLO

®

stops the pump and indicates an ERROR message. PRESFLO

®

AUTOMATICALLY tries to resume NORMAL SERVICE at intervals
of increasing time (1, 15, 30, 60 minutes and successively once
every hour - 24 H for AU/NZ -). If PRESFLO

®

detects any pressure
and/or ow, NORMAL SERVICE is resumed, otherwise, the pump is
stopped again until the next attempt is made. A MANUAL attempt
to resume NORMAL SERVICE can be made at any time.

NOTE 2 - EXCESSIVE STARTS = the repeated stopping and
starting of the pump at intervals of less than 1 minute from each
other. This occurs when the ow rate is less than 2 litres/min. This
may cause damage to the pump. In event of small leaks (dripping),

PRESFLO

®

’s water accumulator guarantees that the pump starts/
stops at time intervals of over 1 minute (less than 60 starts/hour)
and that FREQUENT START-UP errors do not occur. In the event of
a major leak or extended use at excessively low ow rates (less
than 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 40 minutes, PRESFLO

®

stops the pump for
the following 30 minutes (in order to let 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), PRESFLO

®

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.

20 m (65 ft)
12 m (40 ft)
6 m (20 ft)

1

2a

2c

2b

3

4a

4b

Operation

PRESFLO® is switched off.

Press briey or hold down
= nothing happens

Power is restored = PRESFLO

®

resumes NORMAL SERVICE and
starts the pump (if necessary).

No power supply

The system is pressurised.
All taps are turned off. There is
no demand for water.
PRESFLO

®

detects an assembly pressure
higher than that of the start-up pressure
(Pm) and no ow.
Press briey = the pump is
started manually and runs for
a few seconds before stopping
again.
Hold down = lthe pump is put STAND­BY. For instructions on how to reactivate
the pump, see point 3.
A tap is turned on = as soon as the
pressure falls below the start-up pressure
(Pm), the pump is started.

NORMAL SERVICE: the pump is inactive.

The pump has been
stopped manually.
The pump will
remain inactive until a new
command is given.

Press briey

= nothing happens.

Hold down

= the pump resumes NORMAL SERVICE.
See points 2a - 2b.

The system has just
ceased to require
water. All taps are
closed. The pump is still in operation.
The system is pressurized. PRESFLO

®

detects a system pressure higher than
the start-up
pressure (Pm) and no ow.
Press briey or hold down =
the pump is stopped and put in
STAND-BY
To reset see point 3.
If the absence of ow lasts for a few
seconds the pump is stopped

STAND-BY

NORMAL SERVICE: pump during shutdown

See NOTE 1)
PRESFLO

®

has
detected that the
pump is dry running and has therefore
stopped it TEMPORARILY.
Press briey = the pump is started and
manually and resumes NORMAL SERVICE.
See points 2a - 2b.

Hold down

= the pump is put STAND-BY.
For instructions on how to
reactivate the pump, see point 3.

ERROR: stopped temporarily due to DRY RUNNING

The assembly requires water.
One or more taps are turned on.
PRESFLO

®

detects a ow; the
assembly pressure is normally higher
than the START-UP pressure, but it may
also be lower.
Press briey or hold down
= the pump is stopped and put
STAND-BY.
For instructions on how to reac­tivate the pump, see point 3.
The taps are turned off = Sif there is
no ow for a few seconds, the pump is
stopped.

NORMAL SERVICE: the pump is running

(see NOTE 2)
PRESFLO

®

has
detected that the
pump starting-up too often and has therefore
stopped it TEMPORARILY.
Press briey = the pump
is started and manually and
resumes NORMAL SERVICE.
See points 2a - 2b.

Hold down

= the pump will not restart and goes OUT
OF ORDER. The pump is put STAND-BY. For
instructions on how to reactivate the pump,
see point 3.

ERROR: temporary shut down due to FREQUENT
START UP

= Off = On = Flashing

5

6

3

2

4

1

Made in Italy by

DGFLOW srl Via Emilia, 5
46030 Bigarello (Mantova) Italy
tel. [phone]
fax. [phone]
info@dgow.it - www.dgow.it

CODE:
V / Hz:
I max:
P start:

B

50066/115
~230 / 50 - 60
16 A

1.5 Bar

SN 15060002

Exploded view of spare parts

Attention: when ordering spare

parts, always state the position
n° from the diagram below and
the product code number found
in the pressure-ow regulator
technical data table.
1 - Circuit board cover
2 - Pressure gauge
3 - Circuit board
4 - Cable bushings
5 - Valve unit
6 - two-pieces joint with OR

Article

Version

Size

Disposal

When disposing of any
PRESFLO

®

parts, adhere
to the relevant laws and
regulations in force in
the country in which the
equipment is being used.
Do not dispose of any
polluting parts in
the environment.

Statement of Compliance: we declare, under our own respon­sibility, that the product in question is in compliance with the fol­lowing European Directives and national implementation provisions

2014/35/CE Low Voltage Directive
2011/65/CE (RoHS)
2012/19/CE - 2003/108/CEE (WEEE)
2014/30/CE Electromagnetic Compati­bility Directive (EMC)
EN 60730-2-6
EN 61000 6-3

Bigarello 01.06.16

DGFLOW S.r.l.
President
Stefano Concini

Problems Signals Possible causes Solutions
PRESFLO

®

will not turn on

No power Check the electrical connections

The pump will
not start when
a tap is turned on

PRESFLO

®

model with an inadequate
start-up pressure (Pm) for the chosen
application.

Relocate PRESFLO

®

to another position

Install a model with a higher start-up pressure (Pm)

Faulty electrical connections or
pump out of service

Check the electrical connections and that the pump
is working

PRESFLO

®

“STAND-BY” Reset PRESFLO® (See Operation, point 3).

PRESFLO

®

in temporary shut down
due to “DRY RUNNING” due to lack
of water

Wait for the automatic restart or press START to
restart manually (See Operation, point 4a)

Maximum pump pressure is
insufcient

Replace the pump with one with more suitable
characteristics

Install a model with a lower start-up pressure (Pm)

PRESFLO

®

in temporary shut down
due to “FREQUENT START-UP”

Wait for the automatic restart or press START to
restart manually (See Operation, point 4b). Remove
any cause of leakage from system or install an
expansion tank

The pump
delivers no or low
pressure

Filters or pipes may be partly blocked Check the water pipes

PRESFLO

®

’s valve will not open
completely

Check that the valve is not blocked by any foreign
objects and clean if necessary

The pump stops
and starts
repeatedly

Leaks within the system (less than
the shut-off ow rate Qa)

Check the hydraulic connections and repair any
leaks. If a leak cannot be repaired, install an
expansion tank

The pump will
not stop

The ow rate is higher than the
shut-off ow rate (Qa)

Make sure that all taps are turned off and that
there are no leaks within the system

PRESFLO

®

’s check valve will not
close or is damaged

Check that the valve is not blocked by any foreign
objects and clean if necessary

= Off = On = Flashing