fluid-o-tech DGD PRO Series User manual

www.fluidotech.com
INSTRUCTION
MANUAL
GEAR PUMPS IN PEEK, DGD PRO SERIES
Please read the following instructions carefully before
conducting a new installation. DGD PRO series pumps
are direct drive. They must only be handled by specialised
personnel who have the basic technical knowledge related
to electromechanical and hydraulic installations.
WARNINGS
DGD PRO series gear pumps are normally assembled with
non-protected motors in the case of “locked rotor”. This is
why we recommend inserting a fuse and adequately sized
components in a power supply circuit to withstand this
condition.
Inadequate circuits and/or components may overheat, causing
damage and/or a fire. Before connecting the motor it is
necessary to check the polarity is correct. During installation
be careful not to inverse the polarity, in which case the pump
would rotate in the opposite direction and for some motors this
could cause permanent damage to the unit itself.
The unit cannot operate continuously but only in ON/OFF
cycles. It must be installed in a ventilated space in order to
dissipate the heat produced by the motor. In order to avoid
noise and vibrations on mechanical parts, we recommend
installing the unit with rubber anti-vibration mounts. Take
special care when connecting the pump to the fittings in order
to prevent potential leaks. We recommend removing the plastic
plugs located on the pump’s intake and delivery ducts only just
before mounting the fittings and pipes to prevent solid foreign
objects from entering inside, as they could damage the internal
components of the pump. Do not use liquid sealant as drops
could fall in the ducts and cause the pump to block. For use in
the food industry, the pumps (even if NSF-certified) must first
be sterilised by circulating water inside them at a temperature
of 80°C. The water used for this operation must not be reused
during the sterilisation or thereafter, but must be flushed
away. If the unit is replaced, it is necessary to ensure that the
model matches the one being replaced. The circuit must be
thoroughly cleaned and rinsed before starting up the unit.
INSTALLATION
GENERAL SAFETY ADVICE
1The DGD PRO pumps are often driven with DC motors with
brushes, a known source of ignition. Do not use these motors
in potentially explosive atmospheres.
2After prolonged use or applications with hot fluids, the surfaces
of the pump and motor could be hot and potentially cause
injury to skin or burns. After disconnecting the power supply,
wait for the pump to cool down before touching it.
3Do not place the pump near materials with low auto-ignition
temperature/flammable materials. The outer surfaces of the
unit can reach high temperatures. Install the pump in a dry area
protected from dust, splashes and condensation.
4Often motors are cooled by natural convection. We recommend
installing the unit in areas where maximum and adequate
ventilation is ensured. As an indication, the minimum distance
from the walls around the unit should be at least 50 mm. Do
not wrap the unit with insulation material and do not install it
near hot surfaces. Do not use the pump in environments or
with fluids at temperatures higher than those reported in the
catalogue.
5Check the compatibility with the fluid used beforehand. Do not
use or allow the pump to come in contact with chemicals that
could damage the unit.
6An inadequate circuit could cause excessive pressure or
overheating. Make sure the unit is used in accordance with
to the curves in the catalogue. Install the hydraulic circuit
with adequate safety margins, both in terms of pressure and
temperature. We recommend a minimum safety factor of
1.5. Protect the DGD PRO units from frost. Freezing could
permanently damage the pump and pipes.
7The DGD PRO units are low voltage devices, though it is still
necessary to comply with the relevant safety standards. The
installer is responsible for making sure current regulations,
closely associated with the final application, are complied with.
8Insert a filter of a suitable size upstream of the pump to prevent
solid particles with a diameter greater than 10μm from entering
inside. The surface of the filter must be sized in relation to the
flow rate and type of circuit in order to prevent excessive drops in
pressure. This filter must be cleaned periodically. If the filter is not
kept clean, the pump may operate in cavitation and break quickly

9If the units are connected in circuits fitted with solenoid valves,
make sure these always act with a certain delay after the motor
shuts down. Solenoid valves with early or simultaneous closure
can cause excessive pressure or cavitation and damage the
unit and/or the hydraulic circuit.
10 We recommend inserting a fuse of a suitable size in the unit’s
power supply circuit to avoid damage to the unit and/or
electrical circuit.
11 Make sure the electrical connections can ensure the necessary
seal and insulation. Inadequate connections could cause
damage.
12 Choose your DGD PRO unit model in relation to the application
cycle and performance required. Using the units in harsher
conditions than the ones they were designed for could
cause damage. Use the unit only for the time required for the
application.
PLAN THE INSTALLATION
1Make sure the size of the electrical circuit and hydraulic circuit
is suited to the electrical and hydraulic features of the DGD
and DGM PRO units. Provide adequate identification for the
sections of the hydraulic and electric circuit.
2The installation must be conducted in a well ventilated, dry
area protected from splashes, away from heat sources and
flammable fluids. Install the pump in an accessible place to
make subsequent maintenance work easier.
3Make sure the unit is not subjected to vibration induced by the
mechanical or hydraulic connection. If such a condition occurs,
insulate the unit with adequate anti-vibration mounts.
4Provide for the cabling requirements of any additional electronic
boards. If the boards are fitted with heat sinks, install them
adequately to favour dissipation through natural convection.
INSTALLATION
1Secure the unit from a mechanical point of view. We
recommend installing it horizontally (with the motor axis parallel
to the ground) or, in the event of vertical installation, with the
pump facing downwards.
2Remove any IN/OUT protective plugs on the ducts.
3Connect the unit to the hydraulic and electrical circuit. Make
sure it does not cause mechanical stress and pay special
attention to the fluid there may be in the pipes, as this must
not come into contact with electrical parts. In case of negative
suction head, prime the unit by pouring a little water into the
pump, taking care not to wet the electrical parts. The electrical,
hydraulic and mechanical connections must be able to ensure
the necessary seal during operation of the unit.
4Make sure the polarity and voltage in the electric circuit near
the connection to the motor matches the data reported on the
unit’s plate. Identify the positive pole, which should preferably
be protected by a fuse. Please remember that reversing the
polarity may cause permanent damage to the unit. With the
electrical circuit not powered on, connect the motor.
5Make sure the unit is able to prime the fluid. If this does not
happen after 15 seconds, check the efficiency of the intake
circuit’s seal. Make sure there are no leaks in the hydraulic
circuit in both the delivery and in the intake section.
6Check the operation of the valves, which must be fully open
when the unit is installed. Gradually close the delivery valve until
the required performance is achieved. Finally, make sure the
hydraulic performance and absorption values are consistent
with the ones the machine was designed for.
7Once the pump has been primed, check if it is operating
correctly. The parameters to verify this are: the rotation speed
of the motor, the flow rate and pressure in relation to the power
absorbed. Make sure there are no air bubbles in the delivery/
intake duct. Air bubbles could be caused by cavitation or poor
seal of the pipe connected to the intake duct.
CONNECTING THE MOTOR TO THE MAINS
The electrical features of the mains must be compatible with the
electrical data on the motor’s plate, particularly the supply voltage
and frequency. The motor must not be connected to the mains
during installation.
OPERATING CONDITIONS
Make sure the pumped fluid is compatible with the materials of the
pump. Fluid-o-Tech’s gear pumps are designed to work only with
clean fluids and are tested with water at ambient temperature. Any
other fluid and/or operating condition must be verified and approved
by the end customer under the actual conditions of use. Make sure
the maximum temperature of the liquid and the environment are
compatible with the model used.
It is necessary to use – especially on the pump’s intake duct –
pipes with an inner diameter adequately sized in relation to the
pump’s flow rate. This precaution prevents the risk of cavitation
and resulting damage on the pump. The sum of the inlet and outlet
pressure must not exceed the maximum system pressure indicated
in the catalogue. We recommend you adapt the size of the pipe in
relation to the delivery duct for pressure values at least 1.5 times the
maximum pressure of the system.
The pumped fluids must not contain solid suspended particles.
Before mounting the pump, we recommend installing a 10 μm
filter with a surface area large enough in order to prevent excessive
pressure drops in the circuit. Although occasional, particles larger
than 10 μm cause premature wear of internal components. It is
also important to periodically check the state of the cartridge and
the filter. To monitor the filter we recommend installing a pressure-
vacuum gauge after the filter. If the vacuum increases by more than
0.1 bar, the cartridge must be cleaned or replaced. Although DGD
PRO gear pumps are self-priming pumps, they should operate with
a positive suction head.
Indeed dry running causes premature wear of the internal
components of the pump. If the water supply system operates with
low pressure or no flow rate, it is necessary to install a pressure
switch before the pump to turn off the motor. It is also necessary
also protect the system from accidental excessive pressure
with safety devices such as a bypass valve or a pressure switch
connected to the motor. The solenoid valves must not be installed
in the circuit but, if necessary, must only be installed on the delivery
section of the pump.
We strongly recommend against installing the solenoid valves
before the pump. To avoid pressure peaks it is necessary to close
the solenoid valve only after the pump has stopped, then wait a
few seconds after the motor has been turned off to allow it stop
completely. The size of the inner diameter of the solenoid valve’s
duct must be adequate to the pump’s flow rate.
STANDARD MAINTENANCE
DGD Pro series pumps do not require any maintenance.
Replacement of parts must however be carried out by Fluid-o-Tech
personnel or by an official Fluid-o-Tech repair centre.
We recommend cleaning the circuit and filters periodically to prevent
cavitation and wear of the internal components of the pump.

WARRANTY TERMS AND CONDITIONS
Every pump comes with a 12-month warranty valid from the date
of manufacture indicated on the label or 1000 hours of operation
at a maximum pressure of 8 bar and at a maximum speed of 2800
rpm with pure water, whose suspensions are of a maximum Ø of
10μm. Plus a period of 3 months to cover transport and storage.
This period shall not exceed 15 months from the date of the original
invoice under any circumstances.
Fluid-o-Tech can only for held liable for the repair or replacement of
defective parts returned at the customer’s expense, provided that
our analysis reveals that the part or parts in question were defective
at the time of sale. The warranty is voided if:
• The mounting/use instructions have been disregarded.
• The pump was removed by a technician not authorised by
Fluid-o-Tech and/or repaired with non-original parts.
• The pump operated with no water or under cavitation conditions.
• Solid foreign particles are found in the pump.
• Clear signs of excessive pressure are detected.
• The pump has been used for an application it was not intended
for, where the operating conditions and/or the pumped liquid are
incompatible with the pump itself and therefore such application
had not been approved by Fluid-o-Tech.
• The warranty does not cover the normal wear of the pump.
The repair or replacement of faulty parts during the warranty period
will not extend the original period of the warranty.
The Purchaser/User is responsible for the disposal or recycling of
the product at end of its use or lifetime. For more information on
proper disposal method, please contact Fluid-o-Tech Customer
Care.
CERTIFICATIONS
DGD PRO series pumps are NSF certified for use with food-grade
fluids. The CE label can be applied only on motor-pump units. The
label cannot be applied on the pump alone in accordance with EC
standard 1935:2004.
In this case the group meets the requirements of the following
directives: 89/366/EEC concerning Electromagnetic Compatibility
- EMC, 73/23/EEC concerning electrical equipment for use in
potentially explosive atmospheres - DTB and 94/9/EC on Equipment
and Safety devices intended for use in potentially explosive
atmospheres - ATEX. Fluid-o-Tech is able to provide a declaration
of conformity to certify compliance with the above mentioned
Directives.

MANUAL - DGP en - Ed. 11/2020
Fluid-o-Tech reserves the right to modify the characteristics shown at any time and without notice.
Fluid-o-Tech Int’l Inc.
161 Atwater St.,
Plantsville CT (USA) 06479
Tel. [phone]
Fax [phone]
[email protected]
Fluid-o-Tech Asia (Shanghai) Co., Ltd.
2/F, Factory building 6 (1), No. 258, Zhijiang Road,
Fengxian District, Shanghai City, Z.P.: 201499 China
Tel. [phone]
Fax [phone]
[email protected]
Fluid-o-Tech srl
Via Leonardo da Vinci, 40
20094 Corsico, Milano, Italy
Tel. [phone]
Fax [phone]
[email protected]
Fluid-o-Tech Int’l Inc. Japan
2nd Floor, 4-3-8, Espoir Todoroki,
Todoroki, Setagaya, Tokyo 158-0082
Tel. +81 (0) (3) 6432 1812
Fax +81 (0) (3) 6432 1813
[email protected]