BN BNR7231A User manual
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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User Manual
Drywall Sander
Model: BNR7231A
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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1. PRODUCT DESCRIPTION
e machine is designed for grinding drywalls, ceilings and walls of the inner
and outer surfaces, clearing the oor residues, paint coatings, adhesive and
loose plaster etc.
is machine is not suitable for processing objects containing asbestos.
You must abide by certain safety precautions when using the equipment. In
order to ill prevent injuries and damages from occurring, you must always
read through this operating manual carefully.
is manual must be kept in a safe place so that the information that it contains
is always available. is operating manual must accompany the equipment if it is
transferred to somebody else.
We do not accept any liability for accidents or damage arising from ignoring this
manual and the safety instructions.
2. SPECIFICATIONS
Model No. R7231A
Power 600W
Speed 0-1000 /min
Grinding pad diameter 215mm
Sandpaper diameter 225mm
Tube diameter 32mm
Short-length (Without additional tube) 1.23/1.65m
Long Length (With additional tube) 2.20m
Short-weight 4.5 kg
Long Weight 5.0 kg
Protection class Double Insulated / II
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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3. SAFETY INSTRUCTIONS
e following pictograms appear throughout these operating instructions:
Indicates danger of injury, risk to life and possible damage to the appliance
if these instructions are not followed.
Indicates the presence of electric shocks.
Read through these operating instructions ca refully before using the appliance.
Become familiar with the functions and method of operation. To ensure proper
operation, always maintain the appliance according to the instructions. e op-
erating instructions and associated documents should always be kept close to the
appliance.
When using power tools, you must observe the following basic safety precautions
in order to ensure protection from electric shocks, injury and re. Read and follow
all the instructions before using this power tool. Look aer the notes on safety.
Always check if your mains voltage corresponds with the value on the type
plate.
e machine has been double-insulated in accordance with EN60745:
therefore, an earth wire is not necessary.
USE CORRECT SUPPLY VOLTAGE: e power supply voltage must match the
information quoted on the tools identication plate.
USE PROPER EXTENSION CORD: Only use an approved extension cable that is
suitable fqr the machine’s power. e cord must have a diameter of at least 1.5mm2.
When the extension cable is on a reel , unroll the cable in its entirety.
SWITCH OFF THE MACHINE IMMEDIATELY IN CASE OF:
1. Malfunction in the mains plug , power cable or damaging of cable.
2. Broken switch.
3. Smoke or stench of scorched insulation.
4. GENERAL SAFETY RULES
WARNING! Read all safety warnings and all instructions. Failure to follow
the warnings and instructions may result in electric shock, re and/or
serious injury.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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Save all warnings and instructions for future reference. e term “power tool” in
the warnings refers to your mains-operated (corded) power tool or battery-operat-
ed (cordless) power tool.
1) Work area safety
a) Keep work area clean and well lit. Cluttered or dark areas invite accidents.
b) Do not operate power tools in explosive atmospheres, such as in the presence
of ammable liquids, gases or dust. Power tools create sparks which may ignite the
dust or fumes.
c) Keep children and bystanders away while operating a power tool. Distractions
can cause you to lose control.
2) Electrical safety
a) Power tool plugs must match the outlet. Never modify the plug in any way. Do
not use any adapter plugs with earthed (grounded) power tools. Unmodied plugs
and matching outlets will reduce risk of electric shock.
b) Avoid body contact with earthed or grounded surfaces, such as pipes, radiators,
ranges and refrigerators. ere is an increased risk of electric shock if your body is
earthed or grounded.
c) Do not expose power tools to rain or wet conditions. Water entering a power
tool will increase the risk of electric shock.
d) Do not abuse the cord. Never use the cord for carrying, pulling or unplugging
the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Dam-
aged or entangled cords increase the risk of electric shock.
e) When operating a power tool outdoors, use an extension cord suitable for out-
door use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
f) If operating a power tool in a damp location is unavoidable, use a residual
current device (RCD) protected supply. Use of an RCD reduces the risk of electric
shock.
3) Personal safety
a) Stay alert, watch what you are doing and use common sense when operating a
power tool. Do not use a power tool while you are tired or under the inuence of
drugs, alcohol or medication. A moment of inattention while operating power tools
may result in serious personal injury.
b) Use personal protective equipment. Always wear eye protection. Protective
equipment such as dust mask, non-skid safety shoes, hard hat, or hearing protec-
tion used for appropriate conditions will reduce personal injuries.
c) Prevent unintentional starting. Ensure the switch is in the o-position before
connecting to power source and/or battery pack, picking up or carrying the tool.
Carrying power tools with your nger on the switch or energizing power tools that
have the switch on invites accidents.
d) Remove any adjusting key or wrench before turning the power tool on. A
wrench or a key le attached to a rotating part of the power tool may result in
personal injury.
e) Do not overreach. Keep proper footing and balance at all times. is enables
better control of the power tool in unexpected situations.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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f) Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing
and gloves away from moving parts. Loose clothes, jewellery or long hair can be
caught in moving parts.
g) If devices are provided for the connection of dust extraction and collection
facilities, ensure these are connected and properly used. Use of dust collection can
reduce dust-related hazards.
4) Power tool use and care
a) Do not force the power tool. Use the correct power tool for your application.
e correct power tool will do the job better and safer at the rate for which it was
designed.
b) Do not use the power tool if the switch does not turn it on and o. Any power
tool that cannot be controlled with the switch is dangerous and must be repaired.
c) Disconnect the plug from the power source and/or the battery pack from the
power tool before making any adjustments, changing accessories, or storing power
tools. Such preventive safety measures reduce the risk of starting the power tool
accidentally.
d) Store idle power tools out of the reach of children and do not allow persons un-
familiar with the power tool or these instructions to operate the power tool. Power
tools are dangerous in the hands of untrained users.
e) Maintain power tools. Check for misalignment or binding of moving parts,
breakage of parts and any other condition that may aect the power tool’s oper-
ation. If damaged, have the power tool repaired before use. Many accidents are
caused by poorly maintained power tools.
f) Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp
cutting edges are less likely to bind and are easier to control.
g) Use the power tool, accessories and tool bits etc. in accordance with these in-
structions, taking into account the working conditions and the work to be per-
formed. Use of the power tool for operations dierent from those intended could
result in a hazardous situation.
5) Service
Have your power tool serviced by a qualied repair person using only identical
replacement parts. is will ensure that the safety of the power tool is maintained.
5. PRECAUTIONS ON USING DRYWALL SANDER
Attention!•You must abide by the following basic safety measures against
electrical shocks, injuries and the danger of re when using electric tools.
Read and abide by these instructions before you start to use any tools.
ese instructions must be kept in a safe place.
• e equipment must never be used in surroundings where an explosive atmo-
sphere exists.
• Do not let the cable touch any parts of your body.
• Only use the extension cable approved for use in the working area.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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• Do not force the machine for unsuitable work, for example, rough grinding,
brushing, etc. Otherwise, dangers and harms will be caused.
• Only use identical replacement parts when servicing. Otherwise, risk-free
operation can’t be guaranteed.
• e accessories’ allowed speed must be at least the same as the maximum
speed of the machine. Or else, they may be reak or crack when their running
speed is goes over the machine’s allowed speed.
• Do not use damaged accessories. Before use, always check whether the
accessories are nicked or cracked.For example, to grinding pad, please check
the support plate is not cracked. Ensure everybody to be out of the machine’s
rotation area and run the machine at max. speed for one minute, which can
fully test the accessories.
• Do not put down the machine when it isn’t stopped completely. Otherwise, you
will loss control to the machine.
• Cleaning the exhaust port on your machine in regular.
• When working, control the machine rmly with both hands to ensure safe
operation.
• When sanding, do not use too big sandpaper. When choosing grinding disc,
please observe the manufacturer’s specications. e sand paper beyond the
grinding block leads to risk of cutting and injury and cause stuck as well.
• e machine can be connect to one extension tubes at most.
• We recommend that you always wear industrial safety gloves and safety gog-
gles when working with the drywall sander.
• Wearing close-tting clothes is mandatory.
• Always allow for reaction to the machine’s torque
• Wear protection mask P2 to protect you from hazardous dusts and choose
suitable vacuum cleaner.
6. HOW TO USE DRYWALL SANDER
Before setting up, repair or maintenance of the appliance you must always
tum o the operating switch and pull out the mains plug!
Before Initial Operation
• Check if the rated frequency of the mains supply corresponds to the details of
the type place.
• Before using the tool, read the instruction book carefully.
6.1 Installation
Unfold the machine and fasten the handle.(See Fig.1-1,Fig1-2 and Fig1-3). Strip the
machine by the opposite actions.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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Fig .1-1 Fig1-2 Fig.1-3
Fit the screw to the groove; Lock on by fastening block; Finish installation;
Strip the machine by the opposite actions.
NOTE: If nd the fastening block too tight or to loose to lock the handle, please
adjust the tting screw to be looser or tighter by hand!
-stick the sanding paper to the pad (Fig.2)
Fig2
Ensure the holes on the sanding paper to t the holes on the pad accuracy.
-Medium length installation
Loose the screw nut (Fig. 3-1) by anti-clockwise turning and extend the length.
Fig.3-1
en fasten the screw nut by clockwise turning (Fig.3-2).
Fig.3-2
Go back to the non-extended status by opposite actions.
e longest length installation
Insert the additional handle to the end of the machine.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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And then turn the screw nut on the end of the machine for tightening.
Fig.4
Additional Handle
6.2. Electronic Control
is machine has the characteristics as below,
Fig5
On/O Switch
•On/O Switch with so start
Ensure machine starts smoothly without wobbling.
•Adjustable Speed
Adjust the speed from 0-1000rpm by turning the speed wheel (Fig.5) In this way,
user can choose dierent
speed for dierent sanding surface.
•Constant Speed Control
Keep the machine running at the same speed as selected no matter loading to the
machine changes or not.
6.3 Replace Grinding Pad
Fig 6
• Insert the hex wrench (size 5) into the hexagonal screw bolt on the grinding block
(Fig.6)
• Hold the grinding pad rmly, and then turn the wrench to dismount the pad.
• Installation of new grinding pad by tightening the bolt (Fig.6).
Attention: Only install the specied grinding pad on the machine.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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In order to ensure optimal performance, machine should be run at slightly
lower speed for several minutes to make the grinding pad t the sealing surface
perfectly. During this process, the white foam particles will come out from the
grinding head. However, this won’t damage the machine.
6.4 Two Options For Extracting Dust
ere are internal extraction [7 -1] and ex1ernal ex1raction [7 -2] for dust par-
ticles. e 8-hole internal extraction system collects ne dust particles, enabling
to adhere to wall and ceiling, obtaining perfect eect of extracting dust.
Fig 7
6.5 Grinding Adjacent Edges
Detachable brush segment can reach up to the adjacent edge with ease.
Fig 8
6.6 Connect to Vacuum Cleaner
Inhalation of dust is hazardous to health! When carrying out the work which
can produce dust, please always
wear a dust mask.
• Loose the fastening nut.
•Connect the hose to the exit of the handle(Fig.9)
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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Fig 9
• e other end of the hose is connected to the vacuum cleaner;
7. Operate the Machine
• Do not control the machine’s head.
• Hold the machine with both hands.
• Before operating the machine, make sure every fastening handle is closed.
• Connect the machine to the main power supply.
• Before switching on the machine, keep the sanding head slightly away from the
work surface.
• Start the machine for necessary sanding work. Operate the machine with short
length in narrow and awkward area. Run the machine with medium length for
higher walls.Use the machine with longest length for ceilings.
• Do not over-press machine so that to avoid overloading! Press with proper
pressure for better grinding eects. Good grinding eects and quality are
mainly decided by choosing the right abrasive material.
• Once nishing the sanding task, switch o the machine.
8. CARE AND MAINTENANCE
Remove the plug from the socket before carrying out any adjustment,
servicing or mamtenance.
Your power tool requires no additional lubrication or maintenance. Always store
your power tool in a dry place. If the supply cord is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualied persons in order to avoid a
hazard. If a fault can not be rectied, return the mixer to an authorized dealer for
repair.
Cleaning
• Keep the safety devices, ventilation slots and Motor housing as free of dirt and
dust as possible. Clean theunit by rubbing it with a clean cloth or blow it clean
using low-pressure compressed air.
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• We recommend that you always clean the unit immediately aer using it.
• Clean the unit regularly by rubbing it with a damp cloth and a little so soap.
Do not use cleaners or solvents; these will attack the plastic parts in the unit.
You must also ensure that water cannot get into the inside of the
• unit.
Carbon brushes
• If excessive sparking occurs you must have the carbon brushes checked
by a qualied electrician.
• Attention! Only a qualied electrician is allowed to change the brushes.
9. CORRECTIVE ACTION IN CASE OF FAILURE
(1) e operating switch is switched on, but the motor is not working.
-- Wires in the mains plug or in the socket are loose.
Have socket and plug checked or repaired.
--e switch is faulty.
Have the switch replaced.
(2) e operating switch is switched on, but unusual noises can be heard, the
motor is not working or only very slowly.
-- Switch contact has failed.
Have the switch replaced.
-- Component jammed.
Have the electric tool checked or repaired.
--Too much thrust, as a result the motor is dragging.
Use less thrust during the task.
(3) Motor gets hot.
-- Foreign substances have got inside the motor.
Have the foreign substances removed.
--Lack of or contaminated lubrication grease.
Have lubricating grease applied or replaced.
-- Pressure too high
Use less thrust during the task
(4) Frequent or strong sparks on the commutator.
--Short circuit on the armature.
Have the armature replaced.
-- Carbon brushes worn out or jammed
Have the carbon brushes checked.
-- Rough running of the commutator.
Have the surface of the commutator cleaned or ground.
USER MANUAL ~ DRYWALL SANDER MODEL No. BNR7231A
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For your own safety, never remove parts or accessories of the electric tool during
operation. In case of fault or damage have the electric tool repaired only by a
specialist workshop or by the manufacturer.
10. IMPORTANT NOTES
For your personal safety, READ and UNDERSTAND before using.
Save these instruction for future reference
Always Wear Ear Protection With is Tool
Always Wear Eye Protection With is Tool
Always Wear a breathing Mask With is Tool
11 . ENVIRONMENTAL PROTECTION
Do not dispose of in general household waste. Instead dispose of in an
environmental way, contact your local recycling centre or council
and advice. Please take the care of the environment.
BN Products-USA, LLC.
3450 Sabin Brown Road
Wickenburg, AZ 85390
(800) 992-3833
(928) 684-2813
mail@bnproducts.com
www.bnproducts.com
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