
ACM-500sv Oil-Free Air Compressor
User Manual
[Revision 2.0 December 2023]
READ THIS MANUAL CAREFULLY BEFORE USE – FAILURE TO DO SO MAY RESULT IN INJURY, PROPERTY DAMAGE AND
MAY VOID WARRANTY. • KEEP THIS MANUAL FOR FUTURE REFERENCE. • Products covered by this manual may vary in
appearance, assembly, inclusions, specifications, description, and packaging.

ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 2
Safety
Safety messages are designed to alert you to possible dangers or hazards that could cause death, injury or
equipment or property damage if not understood or followed. Safety messages have the following symbols:
You WILL be KILLED or
SERIOUSLY INJURED if you do
not follow instructions.
You CAN be KILLED or
SERIOUSLY INJURED if you do
not follow instructions.
You CAN be INJURED if you do
not follow instructions or equipment
damage may occur.
It is vital that you read and understand this
user manual before using the product,
including safety warnings, and any assembly
and operating instructions. Keep the manual
for future reference.
Safety precautions and recommendations
detailed here must be fully understood and
followed to reduce the risk of injury, fire,
explosion, electrical hazard, and/or property
damage.
Safety information presented here is generic
in nature – some advice may not be
applicable to every product. The term
"equipment" refers to the product, be it
electrical mains powered, battery powered or
combustion engine powered.
• Before Use - If you are not familiar with the
safe operation/handling of the equipment or
are in any way unsure of any aspect of
suitability or correct use for your
application, you should complete training
conducted by a person or organization
qualified in safe use and operation of this
equipment, including fuel/electrical handling
and safety.
• Do NOT operate the equipment in
flammable or explosive environments, such
as in the presence of flammable liquids,
gases, or dust. The equipment may create
sparks or heat that may ignite flammable
substances.
• Keep clear of moving parts.
• Equipment may be a potential source of
electric shock or injury if misused.
• Do NOT operate the equipment if it is
damaged, malfunctioning or is in an
excessively worn state.
• Do NOT allow others to use the equipment
unless they have read this manual and are
adequately trained.
• Keep packaging away from children - risk
of suffocation! Operators must use the
equipment correctly. When using the
equipment, consider conditions and pay
due care to persons and property.
General Work Area Safety
• Work areas should be clean and well it.
• Do not operate the equipment if
bystanders, animals etc are within
operating range of the equipment or the
general work area.
• If devices are provided for connecting dust
extraction / collection facilities, ensure
these are connected and used properly.
Dust collection can reduce dust-related
hazards.
General Personal Safety
• Wear appropriate protective equipment
when operating, servicing, or when in the
operating area of the equipment to help
protect from eye and ear injury, poisoning,
burns, cutting and crush injuries. Protective
equipment such as safety goggles,
respirators, non-slip safety footwear, hard
hat, hearing protection etc should be used
for appropriate equipment / conditions.
Other people nearby should also wear
appropriate personal protective equipment.
Do not wear loose clothing or jewellery,
which can be caught in moving parts. Keep
hair and clothing away from the equipment.
• Stay alert and use common sense when
operating the equipment. Do not over-
reach. Always maintain secure footing and
balance.
• Do not use the equipment if tired or under
the influence of drugs, alcohol, or
medication.
• This equipment is not intended for use by
persons with reduced physical, sensory, or
mental capabilities.
General Fuel Safety
• Petrol/fuel/gasoline is extremely flammable
– keep clear of naked flames or other
ignition sources.
• Do not spill fuel. If you spill fuel, wipe it off
the equipment immediately – if fuel gets on
your clothing, change clothing.
• Do NOT smoke near fuel or when
refuelling.
• Always shut off the engine before
refuelling.
• Do NOT refuel a hot engine.
• Open the fuel cap carefully to allow any
pressure build-up in the tank to release
slowly.
• Always refuel in well ventilated areas.
• Always check for fuel leakage. If fuel
leakage is found, do not start, or run the
engine until all leaks are fixed.
General Carbon-Monoxide Safety
• Using a combustion engine indoors CAN
KILL IN MINUTES. Engine exhaust
contains carbon-monoxide – a poison you
cannot smell or see.
• Use combustion engines OUTSIDE only,
and far away from windows, doors, and
vents.
General Equipment Use and Care
• The equipment is designed for domestic
use only.
• Handle the equipment safely and carefully.
• Before use, inspect the equipment for
misalignment or binding of moving parts,
loose components, damage, or any other
condition that may affect its operation. If
damaged, have the equipment repaired by
an authorised service centre or technician
before use.
• Prevent unintentional starting of the
equipment - ensure equipment and power
switches are in the OFF position before
connecting or moving equipment. Do not
carry equipment with hands or fingers
touching any controls. Remove any tools or
other items that are not a part of the
equipment from it before starting or
switching on.
• Do not force the equipment. Use the
correct equipment for your application.
Equipment will perform better and be safer
when used within its design and usage
parameters.
• Use the equipment and accessories etc. in
accordance with these instructions,
considering working conditions and the
work to be performed. Using the equipment
for operations different from those intended
could result in hazardous situations.
• Always keep equipment components
(engines, hoses, handles, controls, frames,
housings, guards etc) and accessories
(cutting tools, nozzles, bits etc) properly
maintained. Keep the equipment clean and,
where applicable, properly lubricated.
• Store the equipment out of reach of
children or untrained persons. To avoid
burns or fire hazards, let the equipment
cool completely before transporting or
storing. Never place or store the equipment
near flammable materials, combustible
gases, or liquids etc.
• The equipment is not weather-proof, and
should not be stored in direct sunlight, at
high ambient temperatures or locations that
are damp or humid.
• Do not clean equipment with solvents,
flammable liquids, or harsh abrasives.
• For specific equipment safety use and care,
see Equipment Safety.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 3
General Electrical Safety
• Inspect electrical equipment, extension
cords, power bars, and electrical fittings for
damage or wear before each use. Repair or
replace damaged equipment immediately.
• Ensure all power sources conform to
equipment voltage requirements and are
disconnected before connecting or
disconnecting equipment.
• When wiring electrically powered
equipment, follow all electrical and safety
codes.
• Always use a Residual Current Device
(RCD) (GFCI) / Earth Leakage Circuit
Breaker / Safety Switch when operating this
item (electrical items only).
• High voltage / high current power lines may
be present. Use extreme caution to avoid
contact or interference with power lines.
Electrical shock can be fatal.
General Electrical Safety
• Electrically grounded equipment must have
an approved cord and plug and be
connected to a grounded electrical outlet.
• Do NOT bypass the ON/OFF switch and
operate equipment by connecting and
disconnecting the electrical cord.
• Do NOT use equipment that has exposed
wiring, damaged switches, covers or
guards.
• Do NOT use electrical equipment in wet
conditions or in damp locations.
• Do NOT use electrical cords to lift, move or
carry equipment.
• Do NOT coil or knot electrical cords, and
ensure electrical cords are not trip hazards.
General Service Information
• The equipment must be serviced or
repaired at authorised service centres by
qualified personnel only.
• Replacement parts must be original
equipment manufacturer (OEM) to ensure
equipment safety is maintained.
• Do NOT attempt any maintenance or repair
work not described in this manual.
• After use, the equipment and components
may still be hot – allow the equipment to
cool and disconnect spark plugs and/or
electrical power sources and/or batteries
from it before adjusting, changing
accessories, or performing repair or
maintenance.
• Do NOT adjust while the equipment is
running.
• Perform service-related activities in suitable
conditions, such as a workshop.
• Replace worn, damaged or missing
warning/safety labels immediately.
Child Choking Hazard!
• WARNING: CHOKING HAZARD - CHILDREN UNDER 8 YRS. CAN CHOKE OR SUFFOCATE ON SMALL PARTS. ADULT
SUPERVISION REQUIRED.
• Carefully inspect anything a baby or child could gain access to, including this product & packaging.
• Dangers include anything of a size that could become stuck or lodged in a baby or child's airway.
• Dangers include things like raw, hard fruit and vegetable pieces, large pieces of meat, bones or sausage skins, popcorn, nuts,
hard lollies and corn chips, small magnets and batteries, coins, beads, marbles and small uninflated balloons, broken toys and smaller toys,
buttons, keys and coins. But there are also many more.
• Pay particular attention to accessories, nuts, bolts, screws, washers, caps, covers, loose parts, parts that could be removed or break off, pieces
of packaging, staples, tape etc.
• In the case of any doubt, secure the item of concern in an appropriate manner, or completely remove the possibility of access by a baby or child.
General Safety Warnings
• WARNING! READ AND UNDERSTAND ALL INSTRUCTIONS. FAILURE TO FOLLOW ALL INSTRUCTIONS LISTED BELOW, MAY RESULT
IN ELECTRIC SHOCK, FIRE AND/OR SERIOUS PERSONAL INJURY.
• Read all instructions. Know your power tool. Read the operator’s manual carefully. Learn the applications and limitations as well as the specific
potential hazards related to this tool.
Work Area Safety
• Keep work area clean. Cluttered areas and benches invite accidents. Do not leave tools or pieces of wood on the tool while it is in operation.
• Do not use in dangerous environments. Do not use power tools in damp or wet locations or expose to rain. Keep the work area well lit.
• Keep children and visitors away. All visitors should wear safety glasses and be kept a safe distance from work area. Do not let visitors contact
tool or extension cord while operating.
• Never use in an explosive atmosphere. Normal sparking of the motor could ignite fumes.
Electrical Safety
• Guard against electrical shock by preventing body contact with grounded surfaces, e.g., pipes, radiators, ranges, refrigerator enclosures.
• Do not abuse cord. Never carry tool by the cord or yank it to disconnect from receptacle. Keep cord from heat, oil, and sharp edges.
• Should any electrical component of the tool fail to perform properly, shut off the power switch, remove the plug from the power source and
replace before resuming operation.
• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
Personal Safety
• Stay alert and exercise control. Watch what you are doing and use common sense. Do not operate tool when you are tired. Do not rush.
• Dress properly. Do not wear loose clothing, neckties, or jewellery that can get caught and draw you into moving parts. Rubber gloves and non-
skid footwear are recommended when working outdoors. Also wear protective hair covering to contain long hair.
• Always wear safety glasses with side shields. Everyday eyeglasses have only impact resistant lenses; they are not safety glasses.
• Protect your lungs. Wear a face or dust mask if the operation is dusty.
• Protect your hearing. Wear hearing protection during extended periods of operation.
• Do not overreach. Always keep proper footing and balance.
• Remove adjusting keys and wrenches. Form habit of checking to see that keys and adjusting wrenches are removed from tool before turning it
on.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 4
Air Compressor Use and Care
• Do not exceed the pressure rating of any component in the system.
• Protect material lines and air lines from damage or puncture. Keep hose and power cord away from sharp objects, chemical spills, oil, solvents,
and wet floors.
• Check hoses for weak or worn condition before each use, making certain all connections are secure. Do not use if defect is found. Purchase a
new hose or notify an authorized service centre for examination or repair.
• Release all pressures within the system slowly. Dust and debris may be harmful.
• Store idle air compressors out of the reach of children and other untrained persons. Air compressors are dangerous in the hands of untrained
users.
• Maintain air compressors with care. Follow maintenance instructions. Properly maintained products are easier to control.
• Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the product’s operation. If
damaged, have the air compressor serviced before using. Many accidents are caused by poorly maintained products.
• Keep the exterior of the air compressor dry, clean, and free from oil and grease. Always use a clean cloth when cleaning. Never use brake fluids,
gasoline, petroleum-based products, or any strong solvents to clean the unit. Following this rule will reduce the risk of deterioration of the
enclosure plastic.
Service
• When servicing use only identical replacement parts. Use of any other parts may create a hazard or cause product damage. Save these
instructions. Refer to them frequently and use them to instruct other users. If you loan someone this tool, loan them these instructions also.
Air Compressor Safety Warnings
• Know your air compressor. Read operator’s manual carefully. Learn its applications and limitations, as well as the specific potential hazards
related to this product. Following this rule will reduce the risk of electric shock, fire, or serious injury.
• Drain tank of moisture after each day’s use. If unit will not be used for a while, it is best to leave drain valve open until such time as it is to be
used. This will allow moisture to completely drain out and help prevent corrosion on the inside of tank.
• Risk of fire or explosion. Do not spray flammable liquid in a confined area. Spray area must be well ventilated. Do not smoke while spraying or
spray where spark or flame is present. Keep compressors as far from the spraying area as possible, at least 10 m (33 feet) from the spraying
area and all explosive vapours.
• Risk of bursting. Do not adjust regulator to result in output pressure greater than marked maximum pressure of attachment. Do not use at
pressure greater than 115 psi.
• If connected to a circuit protected by fuses, use time delay fuses with this product.
• To reduce the risk of electric shock, do not expose to rain. Store indoors.
• Inspect tank yearly for rust, pin holes, or other imperfections that could cause it to become unsafe.
• Never weld or drill holes in the air tank.
• Make sure the hose is free of obstructions or snags. Entangled or snarled hoses can cause loss of balance or footing and may become damaged.
• Use the air compressor only for its intended use. Do not alter or modify the unit from the original design or function.
• Always be aware that misuse and improper handling of this product can cause injury to yourself and others.
• Never leave a tool unattended with the air hose attached.
• Never point any air tool toward yourself or others.
• Do not operate this air compressor if it does not contain a legible warning label.
• Do not continue to use a tool or hose that leaks air or does not function properly.
• Always disconnect the air supply and power supply before adjusting, servicing a product, or when a product is not in use.
• Do not attempt to pull or carry the air compressor by the hose.
• Your tool may require more air consumption than this air compressor can provide.
• Always follow all safety rules recommended by the manufacturer of your air tool, in addition to all safety rules for the air compressor. Following
this rule will reduce the risk of serious personal injury.
• Never direct a jet of compressed air toward people or animals. Take care not to blow dust and dirt towards yourself or others. Following this rule
will reduce the risk of serious injury.
• Do not use this air compressor to spray chemicals. Your lungs can be damaged by inhaling toxic fumes. A respirator may be necessary in dusty
environments or when spraying paint. Do not carry while painting.
• Inspect product cords and hoses periodically and, if damaged, have them repaired at your nearest authorised service centre. Constantly stay
aware of cord location. Following this rule will reduce the risk of electric shock or fire.
• Never use an electrical adaptor with this grounded plug.
• Check for damaged parts. Before further use of the air compressor or air tool, a guard or other part that is damaged should be carefully checked
to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, binding of moving parts,
breakage of parts, mounting, and any other conditions that may affect its operation. A guard or other part that is damaged should be properly
repaired or replaced by an authorized service centre. Following this rule will reduce the risk of serious injury.
• Never store a tool with an air line connected. Storing the tool while connected to an air supply can result in unexpected operation, firing or
movement and possible serious personal injury.
• Protect your lungs. Wear a face or dust mask if the operation is dusty. Following this rule will reduce the risk of serious personal injury.
• If the power supply cord is damaged, it must be replaced only by the manufacturer or by an authorised service centre to avoid risk.
• Save these instructions. Refer to them frequently and use them to instruct others who may use this product. If you loan someone this product,
loan them these instructions also.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 5
• The machine shall be connected to a circuit protection device (fuse or circuit breaker).
• Operate the machine from the front of the control panel.
• When the machine is in operation, many parts of machine may cause a high temperature. Use necessary personal protection equipment such as
gloves to avoid injuries resulting from a high temperature.
• This machine is not intended for use by persons (including children) with reduced physical, sensory, or mental capabilities, or lack of experience
and knowledge. Children should be supervised to ensure that they do not play with the machine.
Personal Protective Equipment
• CAUTION! WEAR PROTECTIVE CLOTHING AND SAFETY EQUIPMENT TO PROTECT YOURSELF.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 6
Safety Symbols
The product may have safety warning labels attached to it, explained below. Understand the symbols on your
product and their meanings. If any stickers become unreadable, unattached etc., replace them.
Flammable Material Hazard
Flammable liquids, gases, or
substances etc may present.
Avoid ignition sources and open
flames. Danger of fire.
Read User Manual
Read and fully understand
product safety warnings,
operation, procedures etc before
using the product.
Use Hand Protection
Wear appropriate hand protection
and take due care as the product
or use of the product may present
hand hazards.
Carbon-Monoxide Hazard
Do not use the product in
confined areas or without
adequate ventilation. Carbon-
monoxide poisoning can be fatal.
Electrocution / Electrical Shock
Hazard
High voltage or high current
electricity may be present or
required by the product. Take
due care when handling electrical
products, cables, plugs and
leads. Electrical shock can be
fatal.
Toxic Fumes / Dust Hazard
Using the product or by-products
from use may produce fumes,
smoke or particles that could be
harmful if inhaled. Wear
appropriate breathing protection
and have adequate ventilation.
Explosive Material Hazard
Combustible liquids, gases, or
substances etc may be present.
Avoid ignition sources and open
flames. Danger of explosion.
Cutting / Amputation Hazard
The product may have blades,
edges or mechanical devices that
can cause severe cut injury to
fingers, limbs etc. Take due care
when handling and using the
product.
Crush Hazard
The product may have blades,
edges or mechanical devices that
can cause severe crush injury to
fingers, limbs etc. Take due care
when handling and using the
product.
Single Operator Only
The product must be operated by
a single person only. More than
one person operating the product
may introduce additional hazards.
Use Face Protection
Wear appropriate full-face
protection and take due care as
the product or use of the product
may present face and eye
hazards.
Use Foot Protection
Wear appropriate foot protection
and take due care as the product
or use of the product may present
foot hazards.
Use Eye / Ear / Head Protection
Wear appropriate eye and / or
ear and / or head protection and
take due care as the product or
use of the product may present
eye, hearing, and head hazards.
Running Hazard
Do not run on or near the product
as doing so may present a fall
hazard.
Diving Hazard
Do not dive into the product as
doing so may present a neck /
head injury hazard.
Adult Supervision Required
Always supervise children and
other users of a product to
prevent drowning or injury.
Skin Penetration / Puncture
Hazard
The product may produce
pressure, emit liquids or objects
that can cause severe injury to
fingers, limbs, blood etc. Take
due care when handling and
using the product.
Hot Surface Hazard
Be aware that the product may
produce high temperatures and
hot surfaces that can cause burn
injuries.
Flying Debris Hazard
Be aware that the product or use
of the product may present
hazards produced by flying
debris. Wear appropriate clothing
and protective devices.
Moving Parts Hazard
Be aware that the product
contains or uses mechanical
devices that move or rotate.
Always wait for moving parts to
stop fully before handling the
product, adjusting, maintenance
etc.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 7
Carbon-Monoxide Hazard
Do not use the product in
confined areas or without
adequate ventilation. Carbon-
monoxide poisoning can be fatal.
Pull Hazard
Be aware that the product
contains or uses mechanical
devices that can pull in objects
and can cause severe injury to
fingers, limbs etc. Take due care
when handling and using the
product.
Slope / Fall Injury Hazard
Be aware that using the product
on sloping surfaces or in slippery
conditions may present additional
dangers from falls and contact
with blades, moving parts, hot
surfaces etc.
"Slam Dunk" Warning
Do NOT attempt "slam dunk"
manoeuvres as this may result in
severe injury due to falling,
product breakage or collapse etc.
Electrocution / Electrical Shock
Hazard - Outdoor
High voltage or high current
electricity may be present or
required by the product. Do NOT
use in rain, damp, or wet
conditions. Electrical shock can
be fatal.
Electrocution / Electrical Shock
Hazard - Disconnect
High voltage or high current
electricity may be present or
required by the product. Always
disconnect the product from the
electrical supply before handling
the product, adjusting,
maintenance etc.
Power Line Electrocution
Hazard
High voltage / high current power
lines may be present. Use
extreme caution to avoid contact
or interference with power lines.
Electrical shock can be fatal.
"Kick-Back" Hazard
High level of "kick-back" hazard
that can cause the machine to
suddenly rotate towards operator.
Kick-back injury can be fatal.
Winch Operator Position
Hazard
Do NOT stand between winch
and load. Do NOT use winch to
move people.
Winch Lift Hazard
Do NOT LIFT load vertically. Use
machine to PULL only.
Cable Hazard
Ensure that load bearing cable is
not kinked or knotted.
Winch Cable Hazard
Ensure that there is a minimum
number of cable coils on
winching mechanism.
Winch Hook Hazard
Carry hook to load – do NOT
throw or run.
Flash / Blinding Hazard
Wear appropriate eye protection
for welding. Direct exposure to
weld arcs may cause permanent
eye injury.
Laser Hazard
Laser may be in use – do NOT
look directly at laser or allow
others to.
Choking Hazard
Children under 8 yrs. Can choke
or suffocate on small parts. Adult
supervision required.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 8
Table of Contents
Safety ............................................................................................................................................................. 2
Safety Symbols ........................................................................................................................................................... 6
Parts Identification ....................................................................................................................................... 9
Unpacking and Assembly .......................................................................................................................... 10
Unpacking ................................................................................................................................................................. 10
Assembly .................................................................................................................................................................. 10
Wheel Fitment ........................................................................................................................................................... 10
Rubber Feet Fitment ................................................................................................................................................. 10
Air Filter Fitment ....................................................................................................................................................... 10
Operation ..................................................................................................................................................... 11
Starting And Stopping Your Air Compressor ............................................................................................................ 11
Adjusting Outlet Air Pressure ................................................................................................................................... 11
Safety Valve .............................................................................................................................................................. 12
Drain Tap .................................................................................................................................................................. 12
Using the Air Compressor ........................................................................................................................................ 13
Maintenance ................................................................................................................................................ 14
Troubleshooting ......................................................................................................................................... 15
Specifications ............................................................................................................................................. 15
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 9
Parts Identification
No. Name No. Name
1 Pressure Regulator 6
Air Tank Drain Tap
(not visible on image)
2
Pressure Switch ON / OFF button
(not visible on image)
7
Rubber Stoppers
(not visible on image)
3
Air Filter
8
Motor
4 Air Tank 9
Safety Valve
(not visible on image)
5
Wheel
1
4
8
5
7
6
3
9
2
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 10
Unpacking and Assembly
Unpacking
Carefully unpack your air compressor. This air compressor is bulky and heavy; two (2) person lift required.
Dispose of all packing material in an environmentally responsible manner.
Assembly
Your air compressor requires minor assembly before initial operation. Check that you have all the components
required for assembly and initial use.
Wheel Fitment
1. Insert a bolt through the wheel with the long end of the axle facing the compressor.
2. Push the end of the bolt with the wheel attached through the bracket on the side of the air tank.
3. Tighten the nut
Rubber Feet Fitment
Attaching the rubber feet to the bracket located towards the front on the bottom of the tank.
1. Undo the nut and remove the washers from the rubber feet.
2. With another person lifting the front of the compressor by the handle, push the bolt through the hole in the
bracket underneath the air tank.
3. Attach the washer and tighten the nut. Do not over tighten.
Air Filter Fitment
The air filters must be used. Failure to do so may result
in irreparable damage and will void the warranty.
Carefully screw each air filter into the threaded hole on the
side of the pump head in a clockwise direction. The air filters
only need to be tightened by hand. Do not use tools to
tighten the air filter.
NOTE: Do not OVER TIGHTEN as this may damage the air filter or cylinder head, which will NOT be
covered under warranty.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 11
Operation
Starting And Stopping Your Air Compressor
NOTE: Always ensure that you plug your air compressor into a
standard 240V 10Amp AC power point. Never use an extension cord as
this can lead to a voltage drop which may cause damage to the
compressor. Use a longer air hose if you need to get closer to your
work area.
Always start and stop the compressor using the ON/OFF button on the
Pressure Switch. Damage caused by not using the ON/OFF switch will
not be covered by warranty.
To turn your air compressor ON:
Lift up the ON / OFF switch on top of the pressure switch.
To turn your air compressor OFF:
Push down the ON / OFF switch on top of the pressure switch.
Adjusting Outlet Air Pressure
To adjust the outlet air pressure, turn the regulator knob and check the
pressure on the smaller outlet pressure gauge.
•
If pressure needs to be lowered, turn the knob anticlockwise.
•
If pressure needs to be increased, turn the knob clockwise.
Note: Different air tools require different operating pressures. Always check with the tool manufacturer if
unsure.
A. Air tank pressure gauge
B. Pressure regulator
C. Outlet air quick connect
ON
OFF
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 12
Safety Valve
Note: When checking the safety valve ALWAYS wear safety glasses. To check the operation of the
safety valve, the air tank will need to be full.
1. Gently pull the ring on the safety valve outwards. This should release air under pressure.
2. Release the ring and this should stop the air out flow immediately.
3. If the safety valve does NOT work in this manner, STOP the air compressor immediately and have it
checked/ serviced by an authorised service centre.
Drain Tap
After use, open the drain tap slowly to release any moisture that has accumulated in the tank. The air tank will
need to be pressurised to help purge the moisture from the system. Leave the drain tap open when the air
compressor is not in use to allow all moisture to drain from the tank.
•
To open the drain tap, rotate the lever down to vertical.
•
To seal the drain tap, rotate the lever up to a horizontal position.
Note: Ensure the drain tap is closed before starting the compressor.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 13
Using the Air Compressor
Before starting, run through this simple list:
1. Air tank drain tap – Close fully.
2. ON/OFF switch – Is the ON/OFF switch in the OFF position (pushed down)?
3. Connect the air hose and air tool to the air compressor. Check the air hose for damage or any holes. Ensure
quick connector is fully inserted by gently tugging on the end of it.
4. Check the power lead for any damage. If damaged, have it replaced by an authorised service centre.
5. Plug the power lead into a standard 240V 10 Amp AC power point and turn ON the power.
6. Turn on the compressor by lifting the ON/OFF switch.
7. Allow the air compressor to fill the air tank. The air compressor will automatically switch OFF once the air
tank reaches approximately 115 psi in pressure.
8. Regulate required outlet pressure to desired pressure. During use, the air compressor will start and stop
which is normal and is controlled by the pressure switch. The pressure switch is set by the manufacturer and
these settings cannot be changed. Once the initial “‘pump up” stage has finished, and the compressor has
stopped you can adjust the outlet air pressure to the tools recommended working pressure.
When you have finished using your air compressor follow these six simple steps:
1. Turn your air compressor OFF by pushing the ON/OFF switch down.
2. Turn the power point OFF and disconnect the power lead.
3. Very slowly open the air tank drain tap.
Note: It is quite normal for moisture (water) to be exhausted during tank venting.
4. Disconnect your air tools and air hose.
Note: Wear eye and ear protection.
5. Clean and store your air hose and air tools. Store in a secure well-ventilated cabinet.
6. Leave the air tank drain tap open. This allows any moisture to drain while the air compressor is stored.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 14
Maintenance
ATTENTION: Surface corrosion will occur on metal surfaces over time and the rate of oxidation
depends on factors such as proximity to the ocean and humidity or condensation of water
vapour on metal surfaces. To mitigate this, WD40 can be used to remove surface corrosion then, when
applied periodically, it will prevent rust from forming.
Follow these basic maintenance instructions to ensure long, trouble free operation.
Daily:
•
Drain moisture from air tank.
•
Check for air leaks.
Weekly:
•
Remove air filter element and clean or replace as required.
•
Verify cut out/in pressure for correct operation.
Monthly:
•
Inspect non-return valve (clean or replace as required).
CAUTION: Ensure tank is empty.
•
Manually test the safety valve by pulling the ring.
Quarterly:
•
Tighten cylinder head bolts to correct torque.
•
Clean & check valve assembly, replace gaskets/valves if worn or damaged.
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 15
Troubleshooting
If your compressor does not start:
•
Check that you have plugged the power lead into a standard 240V 10Amp power point and turned the switch
ON.
•
Check that you have pulled the air compressor ON/OFF switch out to the ON position.
•
Is the air tank full of air? Use your air tool and the air compressor should start when the pressure decreases
to 87 psi.
If your compressor does not build up pressure:
•
Check that the air tank drain tap is closed and seals (should be in the horizontal position).
•
Check that there are no leaks in air fittings hoses or air tools.
CAUTION: ALWAYS ENSURE POWER SUPPLY IS SWITCHED OFF AND UNPLUGGED FROM THE WALL
BEFORE SERVICING.
Specifications
Air Displacement 254L/Min (8.9 CFM)
Free air delivery @ 7bar 125L/Min (4.4 CFM)
Receiver capacity 50 L
Working pressure 116PSI (8bar)
Restart pressure 86PSI (6bar)
Starting method Automatic Pressure Control Switch
Motor Power 1.5KW (2.0hp)
Motor Input 230~240V 50Hz
IP Rating IP20
Plug SAA 240V 10A
Power Plug Australian Standard
Pump speed 2850 rpm
Noise Level Lpa=62 dBa
Fill time 0~8bar 145"
Refill time 6~8bar 44"
Duty Cycle 0.75
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ACM-500sv Oil-Free Air Compressor
E&OE © 2023 Unimac 16
Measurement System Metric
Rubber tyres Yes
Oil Free Yes
Note: Minimal Assembly Required
Note: Prior to installing and operating this air compressor, it is the buyer’s responsibility to check and adjust
valves/fittings to prevent air leaks.
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Some experts believe that the incorrect or prolonged use of almost any
product may cause serious injury or death. To help reduce your risk of
serious injury or death, refer to the information below. For more information,
see www.datastreamserver.com/safety
Consult all documentation, packaging,
and product labelling before use. Note
that some products feature
documentation available online. It is
recommended to print and retain the
documentation.
Before each use, check the product for
loose/broken/damaged/missing parts,
wear, or leaks (if applicable). Never use a
product with
loose/broken/damaged/missing parts,
wear, or leaks.
Products must be inspected and serviced
(if applicable) by a qualified technician
every 6 months. This is based on
average residential use by persons of
average size and strength, and on a
property of average metropolitan size.
Use beyond these recommendations may
require more frequent
inspections/servicing.
Ensure that all users of the product have
completed a suitable industry recognised
training course before being allowed
access to the product.
The product has been supplied by a general merchandise
retailer that may not be familiar with your specific
application or description of application. Be sure to attain
third-party approval from a qualified specialist for your
application before use, regardless of any assurances from
the retailer or its representatives.
This product is not intended for use where fail-safe
operation is required. As with any product (for example,
automobile, computer, toaster), there is the possibility of
technical issues that may require the repair or
replacement of parts, or the product itself. If the possibility
of such failure and the associated time it may take to
rectify could in any way inconvenience the user, business,
or employee, or financially affect the user, business, or
employee, then the product is not suitable for your
requirements. This product is not intended for use where
incorrect operation or a failure of any kind, including but
not limited to, a condition requiring product return,
replacement, parts replacement, or service by a
technician may cause financial loss, loss of employee
time or an inconvenience requiring compensation.
If this product has been purchased in error when
considering the information presented here, contact the
retailer directly for details of their returns policy, if
required.
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