V.Brøndum RONDA NPU 1250 User manual

USER MANUAL
(Original) (Country code EU ; CH ; DK)
RONDANPU 1250
NPU 2500 & NPU 5000
Strong Negative Pressure Units
For Demanding Extraction Tasks
IMPORTANT!
Read this manual before you start using the machine.
V. BRØNDUM A/S A0.80.0201

User Manual
RONDA

NPU 1250/2500/5000 2 V. BRØNDUM A/S

User Manual
RONDA

NPU 1250/2500/5000 3 V. BRØNDUM A/S
Index
GENERAL DESCRIPTION..................................................................................................................................................5
SAFETY INSTRUCTIONS...................................................................................................................................................6
GUIDELINES REGARDING THE DISPOSAL OF THE MACHINE.............................................................................9
TECHNICAL DATA............................................................................................................................................................10
STANDARD ACCESSORIES.............................................................................................................................................11
CONSTRUCTION................................................................................................................................................................12
MODE OF OPERATION ....................................................................................................................................................12
ASSEMBLING......................................................................................................................................................................13
START-UP............................................................................................................................................................................14
HOSE CONNECTION.........................................................................................................................................................16
HANDLING, OPERATION AND STORAGE..................................................................................................................16
CLEANING AND MAINTENANCE..................................................................................................................................16
MAINTAINING THE FAN HOUSING .............................................................................................................................16
REPLACING FILTERS ......................................................................................................................................................17
TROUBLESHOOTING.......................................................................................................................................................20
DECLARATION OF CONFORMITY...............................................................................................................................21
SERVICE AND REPAIR.....................................................................................................................................................22

User Manual
RONDA

NPU 1250/2500/5000 4 V. BRØNDUM A/S

User Manual
RONDA

NPU 1250/2500/5000 5 V. BRØNDUM A/S
RONDANPU 1250 / 2500 / 5000
Strong negative pressure units for demanding extraction tasks
Congratulations on your new RONDANPU negative pressure unit from V. BRØNDUM A/S.
General Description
RONDANPU 1250 / 2500 / 5000 is developed for extracting air at renovation- and demolition tasks, where fine
and health-hazadous dust may occur.
With an air flow capacity of 1250 / 2500 / 5000 m3the RONDANPU ensures a constant exchange of air inside
enclosed and limited areas.
HEPA filter, filter class H14
Pre-filter in G4 filter medium
Light-weight plastic construction
Large swivel wheels for better mobilty
Manometer indicates the filter load
Adjustable air flow
The user manual is meant to ensure that the NPU is operated in a safe manner and that the user is in no way
unsure of the use. The manual must be stored near the NPU.
Does any uncertainty arise as to the use of the NPU, the work should be stopped until all questions have been
clarified.
Images and drawings are for illustrative purpose and will make the understanding of the manual easier. The
images shown may therefore differ from the actual product.
Read this manual carefully, before you operate the negative
pressure unit.
Keep the manual readily accessible to all users.

User Manual
RONDA

NPU 1250/2500/5000 6 V. BRØNDUM A/S
Safety Instructions
This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction
concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
The appliance is NOT approved for flammable, explosive, poisonous or
extremely health hazardous dust, fluids or gasses.
DO NOT USE THE NPU WITHOUT A PROPER GROUND
CONNECTION. This NPU is designed to be used with a grounding
connection (class I apllicance), in an installation with HFI or HPFI. The
user is responsible for ensuring that the wall outlet is grounded. The
ground connection of the plug must NOT be removed.
RONDANPU must be connected to 230 V mains. Make sure that the
voltage and safety fuse of the power supply correspond with the data of
the data plate of the machine and the information given in this user
manual.
When indicated the filters must be cleaned or, if necessary, changed.
The operator must ensure that the appliance is adjusted to the task and
that regulatory requirements are met.
Avoid damaging the supply cord. When replacing the supply cord, only
use an original supply cord (see the spare parts list). V. BRØNDUM A/S,
an authorized V. BRØNDUM A/S dealer or an equally qualified person
must carry out the replacement in order to avoid danger. Regularly
check the mains connection for damage, such as fissures or ageing. If
damage is found, the supply cord must be replaced before further use.

User Manual
RONDA

NPU 1250/2500/5000 7 V. BRØNDUM A/S
The plug must be removed from the power supply before repair,
maintenance, and cleaning operations of the machine.
Before use, operators should be provided with information, instruction
and training for the use of the appliance and the substances for which it
is to be used, including the safe method of disposal of blocked or
damaged filters.
For user servicing, the appliance must be dismantled, cleaned and
serviced, as far as is reasonably practicable, without causing risk to the
maintenance staff and others. Suitable precautions include
decontamination before dismantling, provision for local filtered exhaust
ventilation where the appliance is dismantled, cleaning of the
maintenance area and suitable personal protection.
The outside of the machine should be decontaminated by vacuum
cleaning methods and wiped clean or treated with sealant before being
taken out of a hazardous area. All the appliance parts shall be regarded
as contaminated when removed from the hazardous area and
appropriate action taken to prevent dust dispersal.
When carrying out service or repair operations, all contaminated items,
which cannot be satisfactorily cleaned, are to be disposed of. Such items
shall be disposed of in impervious bags in accordance with any current
regulation of the disposal of such waste.
When changing the pre-filter or HEPA filter, dispersal of health-
hazardous dust may occur. Therefore, appropriate precautions must be
taken to avoid spreading, and suitable personal protection must be
employed.
Do not cover the NPU while operating.

User Manual
RONDA

NPU 1250/2500/5000 8 V. BRØNDUM A/S
General Safety Instructions
1. Keep the working area clean. Slippery and greasy surfaces increase the risk of accidents.
2. Be aware of the surroundings. Do not expose the NPU to rain. Do not use the NPU in moist or wet
surroundings. Do not use the NPU near flammable gasses or liquids.
3. Keep children and unauthorized persons away from the workplace. Do not let unauthorized persons
touch the NPU or the supply cord. All unauthorized persons should be kept at a distance.
4. Put the NPU away, or make it ready for transport after use. Keep the NPU in a dry place and inaccessible
to children.
5. Do not use force. Do not use force when operating the NPU. Do not pull the hose or the electrical cord.
6. Choose the correct tool/accessories for the task. Do not use badly proportioned or light tools for heavy
tasks. Do not use tools for anything they are not intended for.
7. Choose suitable working clothes.
8. Personal protective equipment. Wear eye and/or ear protection, if necessary. Wear respirator in dusty
environments.
9. Protect the electrical cord. Never carry or pull the NPU by the electrical cord. Do not remove the plug from
the socket by pulling the electrical cord. Keep the electrical cord away from heating sources, oil and sharp
edges. If the electrical cord is damaged, it should be replaced.
10. Choose a safe working position so that there will be no risk of falling over the hose and cord.
11. Keep the machine and equipment in good repair. Keep the NPU clean and dry and follow the instructions
of the chapter about maintenance in the user manual.
12. Cut off the electricity supply when the NPU is not in use. Remove the plug from the socket before
maintenance, repair and when the NPU is not in use.
When using electrical equipment the necessary safety precautions
must be taken in order to avoid the risk of fire, electrical shock and
damage to persons. The below safety instructions are to be read
and followed when the NPU is being used.

User Manual
RONDA

NPU 1250/2500/5000 9 V. BRØNDUM A/S
13. If extension cords are used, the following guidelines must be observed
14. Exercise attention and be rested. The NPU must not be used, if the user is tired, sleepy or sick or under
the influence of alcohol or drugs / medicine.
15. Check for damage. Check the NPU for damage. Check that the shields etc. have been properly fastened.
Check the electrical switches, and have an authorized service mechanic replace them, if they are
damaged. Do not use the NPU, if it cannot be started and/or stopped at the switch.
RONDANPU complies with the Machinery Directive (2006/42 / EC).
Guidelines Regarding the Disposal of the Machine
Does the safe use or maintenance of the appliance raise any questions; do not hesitate to contact either your
dealer or V. BRØNDUM A/S.
Length of cord in
metres
Cross section
<16A
<25A
Up to 20 m
Ø1,5mm²
Ø2,5mm²
20-50 m
Ø2,5mm²
Ø4,0mm²
The product you have purchased is subject to Directive 2002/96/EC of the European
Parliament and the Council of the European Union on waste electrical and electronic
equipment (WEEE) and should not be disposed of as unsorted municipal waste. Please
utilize your local WEEE collection facilities in the disposition of this product and otherwise
observe all applicable national requirements.

User Manual
RONDA

NPU 1250/2500/5000 10 V. BRØNDUM A/S
Make sure that the voltage and fuse of the power
supply correspond with the information of the
data plate of the machine and the information of
this manual.
Technical Data
RONDANPU is connected to 230 V power
supply.
The tables below show the technical data of:
RONDANPU
RONDANPU 1250
Voltage
230
V AC
Weight
28
kg
Max. effect
320
W
L
875
mm
W
485
mm
H
570
mm
Max. air flow
1250
m3/h
Nom. air flow
700
m3/h
Airflow at alarm (@480pa)
539
m3/h
HEPA
H14
Pre-filter
G4
Noise level
88
dB(A)
Exhaust coupling (hose)
300 (315)
mm
Cord length
8
m
RONDANPU 2500
Voltage
230
V AC
Weight
55
kg
Max. effect
700
W
L
1320
mm
W
590
mm
H
695
mm
Max. air flow
2500
m3/h
Nom. air flow
2200
m3/h
Airflow at alarm (@350pa/380pa/650pa)*
535 / 1045 / 1438
m3/h
HEPA filter
H14 - 21,6
m2
Pre-filter
G4
m2
Noise level
85
dB(A)
Exhaust coupling (hose)
300 (315)
mm
Cord length
8
m
* Measured according to DGUV309-012 –(6 meter hose 90°∟@3m)

User Manual
RONDA

NPU 1250/2500/5000 11 V. BRØNDUM A/S
RONDANPU 5000
Voltage
230
V AC
Weight
87
kg
Max. effect
1300
W
Length
1425
mm
Width
740
mm
Height
850
mm
Max. air flow
5000
m3/h
Nom. air flow
3450
m3/h
Airflow alarm (@250pa/350pa/620pa)**
1170 / 1625 / 2243
m3/h
HEPA filter
H14 - 32,6
m2
Pre-filter G4
G4
m2
Noise level
84
dB(A)
Inlet/outlet coupling (hose)
400 (415)
mm
Cord length
8
m
** Calculated –(6 meter hose 90°∟@3m)
Standard Accessories
RONDANPU is delivered with a complete filter system containing HEPA filter and pre-filter:
(Pictures may vary from the actual product)
1
2

User Manual
RONDA

NPU 1250/2500/5000 12 V. BRØNDUM A/S
Filters can be re-ordered with following item-numbers:
NPU 1250 NPU 2500 NPU 5000
1. HEPA filter, filter class H14…………….. 84.67.7090………… 84.67.7091……….84.67.7092
2. Pre-filter, filter class G4…………………. 84.67.7050………… 84.67.7051……….84.67.7052
Construction
RONDANPU is designed as a mobile and robust negative pressure unit for filtering of fine and health-hazardous
dust.
The machine is equipped with wheels which enhance the mobility, and with handles that facilitate lifting of the
unit. The housing contains the fan and the built-in filters, protecting the filters of the NPU during transport and
operation.
The fan housing is equipped with a powerful fan, start/stop button, indicator manometer, and 3 steps for the fan
rotation / suction (only NPU2500 & NPU5000 models).
Filter System
The filter system consists of a HEPA filter in filter class H14,
and a pre-filter in G4 filter medium.
The placing of the pre-filter makes it easy to replace and clean
it. The pre-filter (G4) extracts the coarse particles from the air
and thereby serves as a protection for the HEPA filter.
The HEPA filter withholds the fine and smallest dust particles
that are not held back by the pre-filter. The HEPA filter is class
H14 and filters 99,995 %. The surface of the filter is protected
by metal grating on the inside and outside.
The HEPA filter will be destroyed or its life span reduced if it is exposed to water or moisture.
The HEPA filter cannot be cleaned and must therefore be changed when it is blocked.

User Manual
RONDA

NPU 1250/2500/5000 13 V. BRØNDUM A/S
Mode of Operation
When the fan of the NPU is running, air is sucked through the filters of the machine caching airbourne dust
particles near the filter system. The large air flow through the NPU creates a flow of air and dust particles directed
towards the filter system. In this way, air that is not directly near the NPU is also purified.
The airbourne dust particles are sucked through the pre-filter, where the majority of the particles are withheld. The
filtered air continues through the HEPA filter which holds back 99,995 % (H14) of particles larger than 0,3 µm
(0,0003 mm).
From the HEPA filter the purified air stream continues through the fan and is directed out of the NPU through the
exhaust hose.
IMPORTANT! As the fan sucks cooling air through the machine all filters MUST be mounted and intact.
IMPORTANT! Do not cover the NPU while operating.
IMPORTANT! Never extract from / near processes that form sparks.
Assembling
1. Check that the packing is intact and has no sign of damage from handling and transport.
Unpack RONDANPU and check that all the parts ordered are there.
2. Connect the inlet/outlet hose using the clamp.
3. Check that the filters of the machine are intact and undamaged (see the section about filter replacement),
remove protective covers, if there are any.
4. Before the plug is connected to the electrical main supply you must make sure that the plug and the cord
are undamaged. If the cord or the plug is damaged, a professional must replace the parts. Only an
original cord may be mounted. Connect the machine to 230 V power supply with a reliable earth
connection.
5. RONDANPU is now ready to start operating. er nu klar til at udføre den ønskede opgave. Start-up is
described in the following section.

User Manual
RONDA

NPU 1250/2500/5000 14 V. BRØNDUM A/S
Start-up
When the NPU has been correctly assembled and connected, it can be switched on and off at the start/stop
switch (1) on the fan housing.
The filter load is indicated by the manometer (2)
Fan adjustment switch (3) (1-2-3 step of operation)
Continuation of grounding (4) in case of using tools that require potential equalization for the NPU.
(Accessible earth connection is to be used for testing according to national regulation of electrical equipment)
Connection of the outlet hose (5)
Connection (6) for the 230V electric cord (included)
1
2
3
4
0
0
4
6
0
0
4
5
0
0
4

User Manual
RONDA

NPU 1250/2500/5000 15 V. BRØNDUM A/S
RONDANPU can be connected to an inlet hose. Using an inlet hose will make it easier to catch dust from
specific processes (drilling, sanding, cutting etc.)
If an outlet hose is not connected, the outlet air can
raise dust from the floor resulting in risk of dust
exposure.
Hoses are available in various lengths. We
recommend using inlet/outlet hoses of max. 6 meters.
Extracting form Work Place - Air Exchange –Guage reading
When working with asbestos or PCB an air exchange rate of 8-10 times per hour is required.
The NPU must be positioned so that it provides the greatest possible flow in an enclosure / environmental box.
Eg. opposite airlocks.
OP (over pressure) models can be placed inside the containment. The motor casing is overpressured when in
operation –ensuring “no dust entry”
In the table below, you can read the maximum room size in which the NPU can be used, at a given ceiling height,
if the air exchange rate is to be 8 times per hour (stated at alarm flow-Guage reading):
Ceiling height
RONDANPU
1250
RONDANPU 2500
RONDANPU 5000
STEP
NA
1 / 2 / 3
1 / 2 / 3
2
m
33
m2
33 / 65 / 90
m2
73 / 101 / 140
m2
2,5
m
27
m2
27/ 52 / 72
m2
58/ 81 / 112
m2
3
m
22
m2
22/ 43 / 60
m2
49/ 67 / 93
m2
3,5
m
19
m2
19,25/ 37 / 51
m2
42/ 58 / 80
m2
4
m
16
m2
16,7/ 32 / 45
m2
36/ 50 / 70
m2
4,5
m
14
m2
14,8/ 29 / 40
m2
32,5/ 45 / 62
m2
5
m
12
m2
13,3/ 26 / 36
m2
29,25/ 40 / 56
m2
As the filter system becomes dirty, the air exchange rate will decrease.
Connection for inlet hose

User Manual
RONDA

NPU 1250/2500/5000 16 V. BRØNDUM A/S
IMPORTANT!
The machine must not be connected
to the power supply during cleaning
and service.
Hose Connection
The use of inlet/outlet hoses will reduce the air flow inside the NPU depending on diameter, length and how the
hoses are laid out (bendings and winding).
The air outlet of the machine should always be lead outdoors, if possible.
Handling, operation and storage
Always lift by the handles on both sides of the machine. We recommend at least 2 persons to lift and handle the
NPU.
During operation, use the locks on the wheels to secure the NPU.
Clean the NPU before storing. The NPU should be stored under dry and temperate conditions.
Cleaning and Maintenance
Read the section about safety precautions before
cleaning and maintaining the NPU.
If the machine was used for health-hazadous dust, your
MUST wear personal protection equipment (PPE) at filter
change and handling of the machine.
The easiest way to clean the machine is following:
1. The filter system is cleaned or replaced when neccessary.
2. Vacuum the outside of the machine, using an appropiate nozzle on the vacuum hose.
3. Wipe off the outside of the machine with a dry or damp cloth.
Maintaining the Fan Housing
The fan housing is made of maintenance-free parts and does not need daily maintenance apart from outside
cleaning and control of electric cords and plugs.
The fan housing is easily cleaned using a vacuum cleaner. Do not spray water directly onto the fan housing.
To avoid downtime and to ensure that the NPU is intact and safe to use, we recommend to have an authorized
service technician perform an annual inspection of the electrical parts.
OP models have Over Pressure inside the cabinet –avoiding any dust to enter the inside of the cabinet.

User Manual
RONDA

NPU 1250/2500/5000 17 V. BRØNDUM A/S
Control / Maintenance of the Machine
Description
Before/after use
Interval
Hours
Control of HEPA filter and machine
Before use (check)
Year (inspection)
Electrical test / continuity / impact
6 months*
Cleaning
After use (when needed)
General control of filters and machine
Before use
Control of cords and plugs
Before use
*Depending on regulations (national)
Reordering Filters and Service Parts
NPU 1250
NPU 2500
NPU 5000
HEPA filter
84.67.7090
84.67.7091
84.67.7092
Pre-filter
84.67.7050
84.67.7051
84.67.7052
Replacing Filters
In General
When to replace the filters depends on the user’s assessment and a visual inspection of the coverage.
When replacing the filters, the necessary precautions to protect the environment and the respiratory passages of
the operator must be taken. The nature and scope of these precautions must be based upon the type of dust
being on the surface of the filters. The filters are to be handled in a way not causing any danger, and the safety
equipment must be appropriate for the job.
If the pre-filter was replaced and this didn’t result in an increased air flow and lower pressure indication, the HEPA
filter must also be replaced.
Replacing the Pre-Filter
The pre-filter should be replaced when the
manometer indicator is on RED, or if it has any
visible damages.
The frame /spigot is removed at the clips. Now the
pre-filter can be taken out of the machine –
removing the tape. (Blue arrow)
We recommend pulling out the pre-filter into a
plastic bag, so that release and resuspension of
dust is avoided.

User Manual
RONDA

NPU 1250/2500/5000 18 V. BRØNDUM A/S
The pre-filter of a RONDA NPU must be mounted using tape (eg duct tape / gorilla tape etc.) to ensure that the
pre-filter fits tightly along the edges, so that dust cannot get past the pre-filter and into the HEPA-filter, where it
can cause clogging.
Furthermore, by using tape as gasket, a replacement of the gasket at each change of the pre-filter is ensured,
and the gasket is kept visible for easy inspection.
Replacement:
-Cut loose and remove the pre-filter (remember to pull off the filter into a plastic bag to avoid dust
exposure).
-Remove old tape from the NPU and clean the surface using a wet wipe to remove dust.
-Push the new pre-filter to its position.
-Place tape onto the cardboard of the pre-filter and pull it along the housing (one side at a time).
-Make sure to press the tape tightly.
p
-Press and check the tape on all 4 sides, it must close tightly.
-When all 4 sides are done, the cover with the hose coupling can be mounted.

User Manual
RONDA

NPU 1250/2500/5000 19 V. BRØNDUM A/S
Replacing the HEPA Filter
To ensure dust-free replacement of the HEPA filter, following instructions must be followed:
1) Remove the pre-filter as described in the section
”Replacing the Pre-Filter”
2) Then loosen the bolts in the front (12 pcs) (Blue arrow)
3) The front is removed giving access to the HEPA filter.
4) The HEPA filter is pulled out –pull out the filter into
a plastic bag.
5) Check the contact surface for the filter gasket.
6) Insert new filter.
7) Mount the front by means of the bolts (12 pcs)
8) Insert the pre-filter
9) Mount the frame / Spigot door
Always be careful when replacing the HEPA filter as it can easily be damaged or gaskets can be destroyed.
Always check the contact surface of the gasket for any impurities or damages.
When you dispose of the used filters you must make sure that this is done according to the
national regulations.
Asbestos and Health-Hazardous Dust
Always check up on the local/national regulations in the area where the work is performed.
Always examine how the disposal is to be packed/wrapped up. It might be different from place to place.
Usually the following is mentioned:
oClose-fitting packing; drum/vat with cover
oPlastic bag, min. 100 µm.
Always mark the materials and waste according to the national regulations.
If the machine has been used for asbestos, it must be disassembled and cleaned before it is used in a
clean environment.
The machine must be cleaned and packed before transport. Mark the packing according to the national
regulations.
The machine must be transported in a min. 120 μm plastic bag or other tight-fitting packing.
(Always check according to National regulations regarding transportation of polluted material)

User Manual
RONDA

NPU 1250/2500/5000 20 V. BRØNDUM A/S
Troubleshooting
If the machine does not start:
The electrical cord is not connected.
Connect the cord to a 230V power supply.
The electrical cord is defect.
Replace the cord.
If the machine does not extract in a satisfactory way (Manometerindication RED):
The pre-filter might be blocked.
Clean or replace the pre-filter as described in the section ”Replacing the Pre-Filter”.
The HEPA filter might be blocked.
Clean or replace the HEPA filter as described in the section ”Replacing the HEPA Filter”.
Inlet/outlet hose (if such is being used) might be blocked or to long.
Remove the blocking from the hose.
If the machine does not extract in a satisfactory way:
The HEPA filter might be leaky or falsely mounted, so unfilted air can pass through the NPU.
Correct or replace the HEPA filter as described in the section ”Replacing the HEPA Filter”.
The outlet hose might be blocked.
Remove the blocking from the hose and/or straighten out the hose.
The inlet hose (if such is being used) might be blocked.
Remove the blocking from the hose.