Pentair ONGA MULTI EVO-A User manual

MULTI EVO - A

Thank you and congratulations! You have purchased a product with excellent quality and
service. Secure this service by carrying out the installation works in accordance with the
instructions, so that our product can perform its task to your complete satisfaction. Any
damage caused by inappropriate use invalidates the guarantee.
This manual is an integral part of the product and must be consulted before rst use and
to ensure correct use and maintenance. Please adhere to the instructions in this manual.

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INSTRUCTION MANUAL
SUMMARY
CHAPTER DESCRIPTION PAGE
1 SAFETY INSTRUCTIONS 1
2 APPLICATION 3
3 INSTALLATION 5
4ELECTRICAL CONNECTION 9
5 OPERATION 9
6 MAINTENANCE 12
7QUICK TROUBLESHOOTING GUIDE 13
8 DISASSEMBLY AND DISPOSAL 15
SAFETY INSTRUCTIONS
CHAPTER 1
This instruction manual contains essential information that must be observed during installation, operation and
servicing. It is therefore important that the installer and the responsible technician/operator read this instruction
manual before the equipment is installed and put into operation. The manual must always be available at the
location where the pump or the plant is installed.
Failure to observe the safety instructions can lead to the loss of all warranty.
In this instruction manual, safety information is distinctly labelled with particular symbols. Disregarding this
information can be dangerous.
1.1 QUALIFICATION AND TRAINING OF PERSONNEL
All personnel involved with the operation, servicing, inspection and installation of the equipment must be suitably
qualied for this work and must have studied the instruction manual in depth to ensure that they are suciently
conversant with its contents. The supervision, competence and areas of responsibility of the personnel must be
precisely regulated by the operator. If the personnel do not have the necessary skills, they must be instructed and
trained accordingly.
1.2 SAFETY-CONSCIOUS WORKING
The safety instructions in this instruction manual, the existing national regulations regarding accident prevention,
and any internal working, operating and safety regulations must be adhered to.
General danger to people
DANGER
Warning of electrical voltage
DANGER - ELECTRIC SHOCK RISK
Danger to equipment and operation
ATTENTION

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The pump must only be connected to sockets that have been installed properly in accordance with the
regulations and are protected with a FI-safety switch (RCD,30mA)
Only qualied electricians may carry out electrical works to the pump or the controls.
Always pull out the mains plug before carrying out any work on the pump
Check the rubber hose for mechanical or chemical damage. A damaged or kinked hose must be replaced.
DANGER - ELECTRIC SHOCK RISK
DANGER - ELECTRIC SHOCK RISK
DANGER - ELECTRIC SHOCK RISK
DANGER - ELECTRIC SHOCK RISK
1.3 SAFETY INSTRUCTIONS FOR THE OPERATOR/USER
All legal regulations, local directives and safety regulations must be adhered to.
The possibility of danger due to electrical energy must be prevented.
Legal regulations must be observed.
1.4 SAFETY INSTRUCTIONS FOR INSTALLATION, INSPECTION AND MAINTENANCE WORKS
As a basic principle, works may only be carried out to the equipment when it is shut down. Pumps or plant that
convey harmful substances must be decontaminated.
All safety and protection components must be re-tted and/or made operational immediately after the works have
been completed. Their effectiveness must be checked before restarting, taking into account the current regulations
and stipulations.
1.5 UNAUTHORISED MODIFICATIONS, MANUFACTURE OF SPARE PARTS
The equipment may only be modied or altered in agreement with the manufacturer. The use of original spare parts
and accessories approved by the manufacturer is important for safety reasons. The use of other parts can result
in liability for consequential damage being rescinded. All materials in contact with water have been tested and
approved, therefore only original replacement parts should be used.
1.6 UNAUTHORISED OPERATING METHODS
The operational safety of the supplied equipment is only guaranteed if the equipment is used for its intended
purpose. The limiting values given in the “Technical Data” section may not be exceeded under any circumstances.
1.7 INSTRUCTIONS REGARDING ACCIDENT PREVENTION
Never work alone. Always wear a hard hat, safety glasses and safety shoes and, if necessary, a suitable safety belt.
Before carrying out welding works or using electrical devices, check to ensure there is no danger of explosion.
For the sake of your health, be sure to pay meticulous attention to cleanliness wherever you are working.
Make sure that there are no toxic gases in the working area.
Observe the relevant occupational health and safety regulations and keep rst aid materials available.
In some cases, the pump and the pumping medium may be hot and could cause burns.
For installations in areas subject to explosion hazards, special regulations apply!
This appliance can be used by children aged 8 years or over and by persons with limited physical, sensory or
intellectual capabilities, or with limited experience and knowledge, provided that they are supervised or have been
instructed in the safe use of the appliance and are aware of the dangers involved. Children must not be allowed
to play with the appliance. Cleaning and user maintenance must not be carried out by children unless they are
supervised.

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The Multi Evo-A pump is a multi-stage horizontal manual or self priming pump for pumping clean liquids with no
solid suspended particles, bres or abrasive materials which could chemically or mechanically attack the pump, nor
for liquids not compatible with the pump's construction material. The Multi Evo-A pump must not be used for acids
or corrosive substances
The pump can be used to pump water in:
NOTE
The pump is suitable for use with drinking water for human consumption (with AS/NZS 4020 conformance). If the
pump has been assigned to uses other than water for human consumption, it may no longer subsequently be used
for that purpose.
The data plate lists the specications:
2.1 APPLICATION LIMITS
• water distribution systems
• Temperature of pumped
liquid: from +5°C to +50°C in
compatibility with the pump
materials.
• irrigation systems
• Maximum ambient temperature:
+40°C;
• rain water collection systems
• Max. operating pressure: 8bar
(0.8MPa)
Never use the pump for ammable and/or explosive liquids.
Improper use of the pump can lead to physical injury and/or material damage. Improper use of the product
will render the warranty null and void.
DANGER
DANGER
POS. DESCRIPTION
1Type of pump
2 Flow rate range
3 Head range
4 Minimum head
5 Number of phases
6Voltage
7 Frequency
8 Motor rpm
9 Insulation class
10 Absorbed power of electric pump
11 Rated current
12 Condenser capacity
13 Protection rating
14 Maximum liquid temperature
15 Maximum ambient temperature
16 Maximum operating pressure
17 Weight
18 Serial number
19- Date of manufacture
APPLICATION
CHAPTER 2

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2.2 SOUND PRESSURE LEVEL
The sound pressure level is below 70dB (LpA) on the following models: all models
2.3 MAXIMUM HEAD
See appendix
2.4 TRANSPORT AND STORAGE
On delivery, check that the electric pump has not been subject to damage during transport; in this case
notify the retailer immediately.
Check procedure phases:
Use the original packaging to return the product to the retailer in the event of defects; otherwise dispose of all
packaging materials according to current local standards.
During storage, protect the product from humidity, dust, heat sources, mechanical damage and external
contaminants in order to conserve the quality of the water subsequently placed in contact with the pump.
• check the exterior of the
packaging;
• remove all product packaging
material;
• inspect the product for possible
damaged parts;
• contact the retailer if any defects
are found.
Handle the product in observance of current accident prevention standards.
DANGER

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Install the pump on a at surface and secure to prevent movement during start-up and operation, ensuring that
there are no obstructions to the regular ow of cooling air delivered by the motor fan. If installed for use with
drinking water, clean the pump prior to installation - also clean if left unused for prolonged periods of time.
The pump must be installed in a well-ventilated area, and relative humidity in the environment must not exceed 50%
at 40°C (condensate free).
Ensure that the installation site is suciently sized to enable assembly of the pump on the system and future
maintenance operations.
Ensure that the pump installation room or site is not subject to the risk of ooding by the leakage of liquids or other
events that may cause submersion of the pump itself.
Ensure that the ambient temperature does not exceed the values specied on the data plate.
To avoid the need to drain the system in the event of pump maintenance, the installation of a shutoff valve is
recommended, on the suction and delivery pipelines.
The pump should be installed in such a way to avoid the risk of air pockets in the body or pipelines, in particular on
the suction side of the pump.
To avoid breakdown of the system with the risk of physical injury, use pipelines, connectors and accessories
suited to the maximum operating pressure values.
All pipeline connections must be made by qualied personnel in conformity with current local standards.
If the pump remains in operation with the delivery valve closed for more than a few seconds, the liquid will
overheat. Never use the pump with the shutoff valve closed on the delivery side.
DANGER
DANGER
DANGER
INSTALLATION
CHAPTER 3
Pipelines and valves must be correctly sized according to the installation.
Pipelines must not cause excessive mechanical stress on pump suction or delivery with excessive loads and torque
values. For drinking water, all materials used upstream and downstream of the pump must also be suitable for
contact with drinking water for human consumption
If exible hoses are used, t a semi-rigid pipe on suction to avoid the risk of shrinkage due to negative pressure on
suction.
It is recommended to t a lter on the inlet of the suction pipeline where the pump is used for pumping water from a
well or tank used for the recovery of rain water.
The pump is installed with positive suction head when it is located below the liquid in suction. Figure 1
Periodically check the condition of the lter and regularly clean or replace this element.
DANGER
• Shutoff valve • Check valve • Filler cap

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DANGER
The pump is not intended for use by young children or inrm persons without supervision. Young children
should be supervised to ensure that they do not play with the pump.
The pump should be protected from the weather, oods, chemicals, dust, vermin, insects etc. It is highly
recommended that the pump be housed in a weather proof, well vented enclosure. If the pump is not
adequately housed the warranty may be deemed void.
The pump is installed with negative suction head when it is located above the liquid to be received. Figure 2
Correct pump installation is essential to ensure priming.
• Shutoff valve
• Optional check valve or control
device with internal check valve
on delivery line
• Position the pump in the vicinity
of the well or tank to ensure that
the suction pipe is as short as
possible. In this way, the priming
time is reduced, above all in
the case of large differences in
height between the liquid and
suction point.
• Filler cap
• Foot valve
• Use a pipeline that is at least
the same diameter as that of
the pump suction port. If the
difference between the liquid
and suction point is more than
4 meters, use a pipeline with a
larger section;
• To avoid the formation of air
vortexes, immerse the suction
pipe by at least 0.5m in the liquid
to be pumped (Figure 2);
• Check valve on suction pipeline
for self-priming pumps.
• Install a foot valve with lter at
the end of the suction pipe
( Figure 2) or check valve on the
suction port in the case of self-
priming pumps.
• Ensure complete sealing of the
suction pipe;
• Use wide bends on the suction
section;
The electrical installation shall be in accordance with the national wiring rules (AS/NZS 3000) for class 1,
IP44 rated products.
Freezing conditions will damag e the unit, because when water freezes it expands. Ensure that the pump
is located so that it is not prone to freezing, or ensure that the product is disconnected and dried of water
during cold conditions.
Multi EVO-A pumps are electrically connected. Ensure that they are switched off and unplugged from
socket outlet during installation and any subsequent service work.
The pump is designed to be used with clean water in a residential application. Do not use it with
alternative uids, abrasive, corrosive or explosive uids. Do not install or operate your pump in an
explosive environment or near combustible matter.
Fire and burn hazard. Modern motors run at high temperatures. To reduce risk of re, do not allow leaves,
debris, or foreign matter to collect around the pump motor. To avoid burns when handling the motor, let it
cool for at least 20 minutes before trying to work on it. Automatic thermal overload cut-out protects the
motor for heat damage during operation and it will restart without notice when the motor cools down.

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6. Suction
This is the most important part of the installation as errors will cause signifi cant
problems for the system in performance and longevity.
IMPORTANT: A gate valve must be installed at the tank outlets.
Installations where the tank base is below the pump
Installations where the tank base is level with the pump
8
Min 100mm
100mm
In Line Filter
500 Micron
House Wall
Recommended Length 150mm
Barrel Union
Solid Base
Non-Return
Valve
Gate
Valve
Min 100mm
100mm
In Line Filter
500 Micron
House Wall
Recommended Length 150mm
Barrel Union
Solid Base
Gate
Valve
SUCTION
• This is the most important part of the installation as errors will cause
signicant problems for the system in performance and longevity.
6. Suction
This is the most important part of the installation as errors will cause signifi cant
problems for the system in performance and longevity.
IMPORTANT: A gate valve must be installed at the tank outlets.
Installations where the tank base is below the pump
Installations where the tank base is level with the pump
8
Min 100mm
100mm
In Line Filter
500 Micron
House Wall
Recommended Length 150mm
Barrel Union
Solid Base
Non-Return
Valve
Gate
Valve
Min 100mm
100mm
In Line Filter
500 Micron
House Wall
Recommended Length 150mm
Barrel Union
Solid Base
Gate
Valve
• Installations where the tank base is below
the pump
• Installations where the tank base is level with
the pump
Figure 1
Figure 2
IMPORTANT: A GATE VALVE MUST BE INSTALLED AT THE TANK OUTLETS.

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• Ensure that there is at least 200mm of water in your tank, (i.e. that the tank outlet is covered, and the pump
will not draw any air into the system). Open the gate valve on the tank. Check for any leaks, and repair these if
necessary.
• If no leaks are present, remove the priming plug to open the priming port on the top of the pump case.
• If the tank is above the level of the pump, water will start to run out of this port. Replace the priming plug carefully.
Your pump is now ready to run. (Note: If a check valve is installed in the suction line, water may not ll the pump.
If this occurs, follow the instructions below).
• If the tank water level is below the level of the pump, you will need to ll the pump body and suction line. Remove
the priming plug and ll the pump body and suction line using a funnel.
PUMP PRIMING
• The pump is supplied with a
interconnection appliance coupler and
standard Australian 10 Ampere plug and
cord. Connection to the power supply is
a matter of inserting the plug into the
suitable socket outlet. Before plugging the
power supply cord into the socket outlet,
connect the pump to it using the provided
IEC appliance connectors on the end of
the interconnection cords.
• Ensuring there are no water traces on the
connectors push them rmly into each
other to ensure intended splash (water)
proof protection. This connection shall be
separated again only for service purpose
and only after the power supply is removed
by unplugging the cord from the socket
outlet.
• The socket outlet shall be in a dry and
ood free location; preferably do not use
extension cords for this very reason and
because they can cause voltage drop.
• Supply voltage outside limits specied
in Model Data can cause motor overheat
leading to overload tripping, reduced
component life or seriously damage pump
and voids warranty.
• We recommend, for additional protection,
the pump to be supplied from socket
outlet protected by a residual current
device – RCD (also known as an Earth
Leakage Circuit breaker – ELCB) with a
maximum rated residual current of 30mA.
10
matter of inserting the plug into the suitable socket outlet. Before plugging
the power supply cord into the socket outlet, connect the pump to it using the
provided IEC appliance connectors on the end of the interconnection cords.
Ensuring there are no water traces on the connectors push them fi rmly into
each other to ensure intended splash (water) proof protection. This connection
shall be separated again only for service purpose and only after the power
supply is removed by unplugging the cord from the socket outlet.
The socket outlet shall be in a dry and fl ood free location; preferably do not
use extension cords for this very reason and because they can cause voltage
drop.
Supply voltage outside limits specified in Model
Data can cause motor overheat leading to overload
tripping, reduced component life or seriously
damage pump and voids warranty.
We recommend, for additional protection, the
pump to be supplied from socket outlet protected
by a residual current device – RCD (also known as
an Earth Leakage Circuit breaker – ELCB) with a
maximum rated residual current of 30mA.
WARNING
Hazardous voltage.
Can shock, burn, or
cause death.
DANGER

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• Ensure that the rated voltage and
frequency correspond to those
of the specications of the mains
power available.
• The electrical connection must
be made according to current
local standards.
• Before any intervention on the
pump, disconnect the electrical
mains. Ensure that the electrical
power supply cannot be restored
inadvertently.
• The electrical cables must be
protected, in particular from
high temperatures, vibrations
and impact, which could cause
mechanical or chemical damage.
• The electrical power line must
be tted with a short circuit
protection device, and a residual
current device RCD with high
sensitivity (30mA), protected by
means of a slow-acting fuse or a
magnetothermic switch.
• The electric power line must
be tted with an external main
switch with a contact opening
gap compliant with current local
standards.
4.1 SINGLE PHASE MOTORS
The single phase motors are protected against temperature and current overload by means of thermal cutout
devices in the winding. The motor protection is reset automatically on elapse of the time required for the electric
motor to cool down. See "quick troubleshooting guide".
4.2 THREE PHASE MOTORS
In the case of three phase motors, the user is responsible for installing protection.
The electrical protection must be suitably sized to ensure protection against overloads and short circuits.
4.3 ELECTRICAL CONNECTION
Electrical connections should be made according to the diagram provided on the inside of the terminal board cover.
ELECTRICAL CONNECTION
CHAPTER 4
OPERATION
CHAPTER 5
5.1 PUMP PRIMING
DANGER
The pump must only be started up after it is lled with liquid.
If the pump has not been used for a prolonged period, the lling operation should be repeated
before starting up.
The pump operator or owner must be provided with this owner’s manual. This must be read
before operation, and followed during operation.
The pump is designed to be used with clean water in a residential application. Do not use it with
alternative uids, specically abrasive, corrosive or explosive uids. Do not install or operate
your pump in an explosive enviroment or near combustible matter.
Fire and burn hazard. Modern motors run at high temperatures. To reduce risk of re, do not
allow leaves, debris, or foreign matter to collect around the pump motor. To avoid burns when
handling the motor, let it cool for at least 20 minutes before trying to work on it. Automatic
thermal overload cut-out protects the motor for heat damage during operation and it will restart
without notice when the motor cools down.

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5.2 PUMP INSTALLATION BELOW THE LIQUID LEVEL (NEGATIVE SUCTION HEAD)
The pump must never be operated with the shutoff valve on the delivery side closed. The discharge valve
must be opened as soon as the pump has been started up, to prevent damage to the latter by an excessive
increase in liquid temperature.
If there is no foot valve or check valve on the suction port, lling must be repeated before each start-up.
DANGER
DANGER
If the pump has diculty in increasing pressure, repeat operations 1 to 8. If, after several attempts, the pump
does not operate correctly, see the fault section "quick troubleshooting guide"
5.3 PUMP START-UP
Use the electric pump according to the performance specications as stated on the data plate. Before using
the pump, read Application chapter for a proper use.
Always avoid operation of the pump with the upline shutoff valve closed (suction side). Dry running of the
pump can lead to overhearing and damage to the pump itself.
DANGER
DANGER
OPERATION (CONTINUED)
CHAPTER 5
Never run the pump with the shutoff valve downline (delivery side) completely closed. In this case, the water
in the system reaches very high temperatures, with the risk of damage to equipment and scalding in the event
of escape of the liquid. In this situation, turn off the pump and leave the system to cool.
DANGER
• Close the shut-off valve on
delivery side
• Open the shut-off valve on
suction side
• The electrical cables must be
protected, in particular from
high temperatures, vibrations
and impact, which could cause
mechanical or chemical damage.
• The electrical power line must
be tted with a short circuit
protection device, and a residual
current device RCD with high
sensitivity (30mA), protected by
means of a slow-acting fuse or a
magneto thermic switch.
• Loosen the ller cap to allow air
to escape, allow complete lling
of the body pump and suction
pipe with the uid, until liquid
ows out.
• The electric power line must
be tted with an external
main switch contact opening
gap compliant with relevant
standards.
• Tighten the ll plug.
• Start the pump and slowly open
the valve on delivery side, to
ensure venting of the residual air
left in the pump body and allow
pressure to build up

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Never use the pump in the event of cavitation, as this can cause damage to the hydraulic components.
Pressure on the downline side of the pump (delivery side) must never exceed the maximum operating pres-
sure PN as indicated on the pump data plate. Pressure downline of the pump is obtained from the sum of
the pressure delivered and the pressure on the suction side (gravity for installations with negative suction
head, aqueducts, or water system where admissible or required).
DANGER
DANGER
• Check that the shutoff valves
downline of the pump (delivery
side) and upline of the pump are
in the open position.
• Start the pump.
• If the pump does not start
up correctly, on reaching the
operating conditions in a short
time, the pump shuts down.
• In this case repeat the “Pump
priming” phase.
Start-up operation
Start the pump and check rotation of the motor. It rotates in a clockwise direction when viewing the fan
through the cowl behind the motor.
D.R.O.P (Dry Running Over-Temperature Protection)
The Onga Multi Evo-A series of pumps are tted with the internationally patented D.R.O.P system which
protects the hydraulic parts from possible damage that can be caused by overheating of the liquid inside
the pump casing.
The overheating can be the result of external causes (outside the pump) or occurs because the pump
stops priming and as water is pumped out the pump runs dry.
Restoring Operation
Set the switch to “O”, unplug unit from power outlet. Remove cause of malfunction.
Wait a few minutes, allowing all the hydraulic parts to cool down.
Set the switch on the “1”, plug the unit into power outlet. The red light goes off and the pump starts
operating. If the red light remains on, turn the switch to “O”, unplug the unit, wait a few minutes and repeat
the start up procedures.
1
2
3
Figure 3

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• In normal conditions, the electric
pumps do not require any
scheduled maintenance.
• With a view to prevention
of possible faults, it is
recommended to periodically
check the pressure delivered
and current absorption.
A reduction in pressure is
symptomatic of pump wear. An
increase in current absorption
is symptomatic of abnormal
mechanical friction in the pump.
• Special maintenance may be
required to clean the pump and
replace any worn parts.
• If the pump is not used for
prolonged periods (e.g. for
an entire season) it should be
drained completely rinsed with
clean water and stored in a dry
location.
• If the pump is used for
applications with drinking water
for human consumption and it
is not used for a long period,
repeat the procedures listed in
Installation chapter.
Refer to the “safety instructions”.
DANGER
Before any intervention on the pump, disconnect the electrical mains. Ensure that the electrical power
supply cannot be restored inadvertently.
DANGER - ELECTRIC SHOCK RISK
Pump should only be serviced only by qualied personel. For best results, use only genuine service parts.
Be sure to prime pump before starting.
To avoid dangerous or fatal electrical shock, turn OFF power to pump and remove plug from outlet before
attending the pump.
RCD tripping indicates an electrical problem. If RCD trips and will not reset have a qualied electrician
inspect and repair electrical system and/or pump.
If service is required to the power supply cord and/or appliance connectors, they must be replaced with
the specialised cord assemblies by Pentair Water service agent or similarly qualied personnel in order to
avoid a hazard.
Liquid may be HOT, release pressure with care before servicing.
Under normal conditions the Onga Multi Evo-A series of pumps requires only minimal attention.
In order to prevent possible failures, it is advisable to periodically check the pressure supplied and power
absorption.
A decrease in pressure is a symptom of wear.
An increase current absorpion is a sign of abnormal mechanical function in the pump and/or motor.
6.1 SERVICE AND MAINTENANCE
6.2 GENERAL CARE AND MAINTENANCE
MAINTENANCE
CHAPTER 6

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• No power supply turn on the
switch and check that no
electrical connections are loose
or defective.
• Check the mains voltage
• Fuse blown check that the cables
and relative connections are not
defective and replace the fuse if
necessary
• The single phase motor thermal
cutout has tripped this is reset
automatically once the motor
has cooled
• Motor overload cutout has
tripped check that the cables
and relative connections are not
defective, check that the pump
is not blocked mechanically, or
whether the pump winding is
damaged (replace if necessary)
• Electrical power line damaged =
replace
• Pump blocked mechanically =
clean
7.1 THE PUMP DOES NOT WORK
• Excessive current absorption
check the operating condition of
the pump
• If foreign bodies are present,
blocking hydraulics = clean the
hydraulic components
• Phase missing on power supply
(three phase motor) = check the
electrical power supply
• The single phase motor thermal
cutout has tripped = this is reset
automatically once the motor
has cooled; check installation
conditions
• Thermal cutout protection
setting or fuses not suitable =
check protection devices with
respect to rated current of pump
• Power cable damaged = replace
component
• Motor damaged = replace
component
7.2 THE PUMP STOPS AFTER A SHORT INTERVAL OF OPERATION DUE TO A TRIPPED MOTOR PROTECTION DEVICE
Refer to the “safety instructions”.
DANGER
7.4 PUMP PERFORMANCE IS REDUCED
7.5 PUMP PERFORMANCE IS UNSTABLE
• Pipelines obstructed check
pipelines
• Incorrect impeller rotation (three
phase motor) check direction of
rotation
• Pump suction pressure too low or
cavitation check the pump inlet
conditions
• Suction pipe is partially
obstructed with impurities clean
the suction pipe
• Pump is not primed correctly
repeat the "pump priming"
procedure
• Leak from suction pipe repair or
replace suction pipe
• Air in suction pipe bleed the
suction pipe, repeat the "pump
priming" instructions
7.3 THE PUMP STARTS UP BUT DOES NOT DELIVER LIQUID
• Pump is not primed repeat the
"pump priming" procedure
• The pump takes in air check the
liquid level, operation of the foot
valve and the suction pipeline
• The foot valve is blocked in the
closed position replace or clean
the valve
• For self-priming pumps only:
The liquid column above the
check valve on the delivery
pipeline prevents self-priming
of the pump = drain the delivery
pipeline. Check that check valve
does not retain liquid in the
delivery pipeline. Repeat the
start-up procedure.
QUICK TROUBLESHOOTING GUIDE
CHAPTER 7
• For self-priming pumps only: The
differential pressure inside the
pump is too low = gradually close
a valve until delivery pressure
stabilizes and the noise level is
reduced
• For self-priming pumps only:
the internal valve has not closed
gradually close a valve until there
is a visible increase in pressure
or ow. Then open the valve
gradually until the required ow
rate is reached.

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7.7 PUMP DOES NOT OPERATE AND MOTOR DOES NOT RUN
7.10 NOTICEABLE REDUCED PERFORMANCE
• No Electricity
• Not Plugged in correctly
• Circuit breaker activated
• Suction head is too high.
• Foot valve/strainer only partially
submerged
• Pump shaft seal is worn or
damaged
• Pump is partially blocked with
debris
• Pressure switch setting are
incorrectly set or faulty.
• Reduce the suction head
• Lengthen suction pipe
• Replace defective parts
• Remove debris and ush pump with clean water
Check and adjust pressure switch and/or replace faulty
parts
• Verify presence of electricity
• Ensure pump is connected
properly
• Reset circuit breaker
7.9 PUMP OPERATES BUT DELIVERS NO WATER
• Pump is not lled with water.
• Suction head is too high.
• Foot valve/strainer is not
submerged enough.
• Suction pipe is taking in air
• Suction pipe/strainer or non-
return valves are clogged with
debris
• Pump is clogged with debris.
• Fill the pump with water (see installation section - Priming
Pump )
• Reduce the suction head
• Make the suction pipe longer (max 8 metres)
• Check the suction pipe and joints for air leaks.
• Clean the suction pipe/strainer or non-return valve
• Clean the pump of debris
7.8 THE PUMP HUMS AND THE THERMAL RELAYS CUT IN AND OUT
• Pump is clogged by debris.
• Capacitor is defective
• Clean suction pipe and foot valve/ strainer. Clean the
pump by ushing with water. Remove the priming and
drain plugs. If the pump cannot start after several
ushings, it must be dismantled and cleaned.
• Replace capacitor.
Should problems persist, contact your nearest Onga Service Agent.
7.6 THE PUMP ROTATES IN THE OPPOSITE DIRECTION WHEN SHUT DOWN
• Foot valve or check valve
defective or blocked in the open
position = remove and clean or
replace the valves
• Leak from suction pipe = remove
and repair suction pipe

15
EN
INSTRUCTION MANUAL
Before any intervention on the pump, disconnect the electrical mains. Ensure that the electrical power
supply cannot be restored inadvertently.
• Disconnect the pump electrically
from the system according to
safety standards
• Loosen the ller cap to reduce
the pressure of the liquid
remaining between the two
valves
• Open the tap nearest to the
pump to decrease the system's
pressure
• Remove the drain cap from the
pump body to completely empty
the pump
• Before disassembly, close the
shutoff valves on the delivery
side, and if present also close the
shutoff valve on the suction side.
DANGER - ELECTRIC SHOCK RISK
Note the position of the ller hole, which is also used as a bleed point. Ensure that the liquid on outlet cannot
cause damage or physical injury.
DANGER
This product or any part of the latter must be disposed of in accordance with local standards using the public
or private waste collection authorities as required.
DISASSEMBLY AND DISPOSAL
CHAPTER 8

16
NOTES

17
NOTES

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