DeVillbiss L10120H2-2, MGP-SL10120H-2A User Manual
OWNERS MANUAL FOR
TWO-STAGE
AIR COMPRESSOR
Model No.
L10120H2-2
Specification Chart
Model No.
Horsepower
Voltage/Hertz/Phase
Minimum Branch Circuit Requirement
*Fuse Type
Air Tank Capacity
Approximate Cut-in Pressure
Approximate Cut-out Pressure
SCFM @ 175 PSIG
Magnetic Starter
*A circuit breaker is preferred. Use only a fuse or circuit breaker that is the same rating as
the branch circuit the air compressor is operated on. If the air compressor is connected to
a circuit protected by fuses, use only time delay fuses. Time delay fuses should be
marked "D" in Canada and "T" in the US.
In the unlikely event you should have a problem with this product or if you are missing any parts, it is not necessary
to return it to the store where you purchased it. Simply call our toll free number and talk with our Service
Representative.
240/480V/60 HZ/3 PHASE
Required (Included on Compressor)
L10120H2-2
10
30 Amp
Time Delay
120 Gal. ASME
140 PSIG
175 PSIG
34.2
MGP-SL10120H-2A Rev. 2 1/24/03
OUR OFFICE HOURS ARE FROM
8:00 a.m. to 6:00 p.m. (CST)
MONDAY THROUGH FRIDAY
CALL TOLL FREE 1-800-888-2468
DeVilbiss Air Power Company • 213 Industrial Dr. • Jackson, TN 38301-9615
TABLE OF CONTENTS
Page
SAFETY GUIDELINES ................................... 2
WARNING CHART ......................................... 3-5
SPECIFICATIONS .......................................... 6
GLOSSARY .................................................... 6
DUTY CYCLE ................................................ 6
GENERAL INFORMATION ............................ 7
ON-RECEIPT INSPECTION ........................... 7
DESCRIPTION OF OPERATION ................... 8
INSTALLATION AND
BREAK-IN PROCEDURES ............................. 9-12
Location of Air Compressor .......................... 9
Air Compressor Anchoring Methods ............. 9
Wiring Instructions and Diagram ................... 10
Voltage and Circuit Protection ...................... 10
Air Filter Installation ...................................... 11
Break-in Procedures ..................................... 11
Additional Regulators and Controls .............. 11
Lubrication and Oil ....................................... 11
Piping and Diagram ...................................... 12
Page
MAINTENANCE ............................................. 14
SERVICE INSTRUCTIONS ............................. 15-16
Air Filter-Inspection and Replacement .......... 15
Oil-Checking and Changing .......................... 15
Recommended Oils ..................................... 15
Check Valve-Inspection and Replacement ..15-16
Safety Valve-Inspection and Replacement ... 16
Adjusting Belt Tension .................................. 16
Motor Pulley and Flywheel Alignment ........... 17
Additional Service ........................................ 17
STORAGE....................................................... 17
TROUBLESHOOTING GUIDE ...................... 18-21
COMPRESSOR DIAGRAM ............................ 22
COMPRESSOR PARTS LIST ......................... 23
COMPRESSOR PUMP DIAGRAM ................ 24
PUMP PARTS LIST ....................................... 25
SERVICE NOTES ............................................ 26
WARRANTY STATEMENT ............................. 27
OPERATING PROCEDURES ......................... 13
HOW TO ORDER REPAIR PARTS ....... Back Cover
SAFETY GUIDELINES - DEFINITIONS
This manual contains information that is important for you to know and understand. This information relates to protecting YOUR
SAFETY and PREVENTING EQUIPMENT PROBLEMS. To help you recognize this information, we use the symbols to the right.
Please read the manual and pay attention to these sections.
DANGER indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in death of serious injury.
Retain Original Sales Receipt as Proof of Purchase for Warranty Repair Work.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, may result
in property damage.
MGP-SL10120H-2A
2—ENG
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
IMPROPER OPERATION OR MAINTENANCE OF THIS PRODUCT COULD RESULT IN SERIOUS INJURY AND PROPERTY
DAMAGE. READ AND UNDERSTAND ALL WARNINGS AND OPERATING INSTRUCTIONS BEFORE USING THIS EQUIPMENT.
HAZARD
RISK OF EXPLOSION OR FIRE
WHAT CAN HAPPEN
IT IS NORMAL FOR ELECTRICAL CONTACTS WITHIN THE
MOTOR AND PRESSURE SWITCH TO SPARK.
IF ELECTRICAL SPARKS FROM COMPRESSOR COME INTO
CONTACT WITH FLAMMABLE VAPORS, THEY MAY IGNITE,
CAUSING FIRE OR EXPLOSION.
RESTRICTING ANY OF THE COMPRESSOR VENTILATION
OPENINGS WILL CAUSE SERIOUS OVERHEATING AND
COULD CAUSE FIRE.
UNATTENDED OPERATION OF THIS PRODUCT COULD
RESULT IN PERSONAL INJURY OR PROPERTY DAMAGE.
RISK OF BURSTING
HOW TO PREVENT IT
ALWAYS OPERATE THE COMPRESSOR IN A WELL VENTILATED AREA FREE OF COMBUSTIBLE MATERIALS,
GASOLINE OR SOLVENT VAPORS.
IF SPRAYING FLAMMABLE MATERIALS, LOCATE COMPRESSOR AT LEAST 20 FEET AWAY FROM SPRAY AREA. AN
ADDITIONAL LENGTH OF HOSE MAY BE REQUIRED.
STORE FLAMMABLE MATERIALS IN A SECURE LOCATION
AWAY FROM COMPRESSOR.
NEVER PLACE OBJECTS AGAINST OR ON TOP OF COMPRESSOR. OPERATE COMPRESSOR IN AN OPEN AREA AT
LEAST 12 INCHES AWAY FROM ANY WALL OR OBSTRUC-
TION THAT WOULD RESTRICT THE FLOW OF FRESH AIR TO
THE VENTILATION OPENINGS.
OPERATE COMPRESSOR IN A CLEAN, DRY, WELL VENTILATED
AREA. DO NOT OPERATE UNIT INDOORS OR IN ANY CON-
FINED AREA.
ALWAYS REMAIN IN ATTENDANCE WITH THE PRODUCT
WHEN IT IS OPERATING.
AIR TANK: THE FOLLOWING CONDITIONS COULD LEAD TO A WEAKENING OF THE TANK, AND RESULT IN A
VIOLENT TANK EXPLOSION AND COULD CAUSE PROPERTY DAMAGE OR SERIOUS INJURY.
WHAT CAN HAPPEN
1. FAILURE TO PROPERLY DRAIN CONDENSED WATER
FROM THE TANK, CAUSING RUST AND THINNING OF THE
STEEL TANK.
2. MODIFICATIONS OR ATTEMPTED REPAIRS TO THE TANK.
3. UNAUTHORIZED MODIFICATIONS TO THE UNLOADER
VALVE, SAFETY VALVE, OR ANY OTHER COMPONENTS
WHICH CONTROL TANK PRESSURE.
4. EXCESSIVE VIBRATION CAN WEAKEN THE AIR TANK
AND CAUSE RUPTURE OR EXPLOSION.
DRAIN TANK DAILY OR AFTER EACH USE. IF TANK DEVEL-
OPS A LEAK, REPLACE IT IMMEDIATELY WITH A NEW TANK OR
REPLACE THE ENTIRE COMPESSOR.
NEVER DRILL INTO, WELD, OR MAKE ANY MODIFICATIONS
TO THE TANK OR ITS ATTACHMENTS.
THE TANK IS DESIGNED TO WITHSTAND SPECIFIC OPERATING
PRESSURES. NEVER MAKE ADJUSTMENTS OR PARTS
SUBSTITUTIONS TO ALTER THE FACTORY SET OPERATING
PRESSURES.
HOW TO PREVENT IT
ATTACHMENTS & ACCESSORIES:
EXCEEDING THE PRESSURE RATING OF AIR TOOLS, SPRAY
GUNS, AIR OPERATED ACCESSORIES, TIRES AND OTHER
INFLATABLES CAN CAUSE THEM TO EXPLODE OR FLY
APART, AND COULD RESULT IN SERIOUS INJURY.
FOR ESSENTIAL CONTROL OF AIR PRESSURE, YOU MUST
INSTALL A PRESSURE REGULATOR AND PRESSURE GAUGE
TO THE AIR OUTLET OF YOUR COMPRESSOR. FOLLOW THE
EQUIPMENT MANUFACTURERS RECOMMENDATION AND
NEVER EXCEED THE MAXIMUM ALLOWABLE PRESSURE
RATING OF ATTACHMENTS. NEVER USE COMPRESSOR TO
INFLATE SMALL LOW-PRESSURE OBJECTS SUCH AS
CHILDREN’S TOYS, FOOTBALLS, BASKETBALLS. ETC.
3—ENG
MGP-SL10120H-2A
HAZARD
RISK FROM FLYING OBJECTS
WHAT CAN HAPPEN
THE COMPRESSED AIR STREAM CAN CAUSE SOFT TISSUE
DAMAGE TO EXPOSED SKIN AND CAN PROPEL DIRT, CHIPS,
LOOSE PARTICLES AND SMALL OBJECTS AT HIGH SPEED,
RESULTING IN PROPERTY DAMAGE OR PERSONAL INJURY.
RISK TO BREATHING
WHAT CAN HAPPEN
THE COMPRESSED AIR FROM YOUR COMPRESSOR IS NOT
SAFE FOR BREATHING! THE AIR STREAM MAY CONTAIN
CARBON MONOXIDE, TOXIC VAPORS OR SOLID PARTICLES
FROM THE TANK.
HOW TO PREVENT IT
ALWAYS WEAR ANSI Z87.1 APPROVED SAFETY GLASSES
WITH SIDE SHIELDS WHEN USING THE COMPRESSOR.
NEVER POINT ANY NOZZLE OR SPRAYER TOWARD ANY
PART OF THE BODY OR AT OTHER PEOPLE OR ANIMALS.
ALWAYS TURN THE COMPRESSOR OFF AND BLEED PRESSURE FROM THE AIR HOSE AND TANK BEFORE ATTEMPTING
MAINTENANCE, ATTACHING TOOLS OR ACCESSORIES.
HOW TO PREVENT IT
ALWAYS OPERATE AIR COMPRESSOR OUTSIDE IN A CLEAN,
WELL VENTILATED AREA. AVOID ENCLOSED AREAS SUCH AS
GARAGES, BASEMENTS, STORAGE SHEDS, WHICH LACK A
STEADY EXCHANGE OF AIR. KEEP CHILDREN, PETS AND
OTHERS AWAY FROM AREA OF OPERATION.
NEVER INHALE AIR FROM THE COMPRESSOR EITHER
DIRECTLY OR FROM A BREATHING DEVICE CONNECTED TO
THE COMPRESSOR.
SPRAYED MATERIALS SUCH AS PAINT, PAINT SOLVENTS,
PAINT REMOVER, INSECTICIDES, WEED KILLERS, CONTAIN
HARMFUL VAPORS AND POISONS.
RISK OF ELECTRICAL SHOCK
WHAT CAN HAPPEN
YOUR AIR COMPRESSOR IS POWERED BY ELECTRICITY.
LIKE ANY OTHER ELECTRICALLY POWERED DEVICE, IF IT IS
NOT USED PROPERLY IT MAY CAUSE ELECTRIC SHOCK.
REPAIRS ATTEMPTED BY UNQUALIFIED PERSONNEL CAN
RESULT IN SERIOUS INJURY OR DEATH BY ELECTROCUTION.
ELECTRICAL GROUNDING: FAILURE TO PROVIDE ADEQUATE
GROUNDING TO THIS PRODUCT COULD RESULT IN SERIOUS
INJURY OR DEATH FROM ELECTROCUTION. SEE GROUND-
ING INSTRUCTIONS.
WORK IN AN AREA WITH GOOD CROSS-VENTILATION. READ
AND FOLLOW THE SAFETY INSTRUCTIONS PROVIDED ON
THE LABEL OR SAFETY DATA SHEETS FOR THE MATERIAL
YOU ARE SPRAYING. USE A NIOSH/MSHA APPROVED
RESPIRATOR DESIGNED FOR USE WITH YOUR SPECIFIC
APPLICATION.
HOW TO PREVENT IT
NEVER OPERATE THE COMPRESSOR OUTDOORS WHEN IT IS
RAINING OR IN WET CONDITIONS.
NEVER OPERATE COMPRESSOR WITH COVER COMPONENTS
REMOVED OR DAMAGED.
ANY ELECTRICAL WIRING OR REPAIRS REQUIRED ON THIS
PRODUCT SHOULD BE PERFORMED BY AUTHORIZED
SERVICE CENTER PERSONNEL IN ACCORDANCE WITH
NATIONAL AND LOCAL ELECTRICAL CODES.
MAKE CERTAIN THAT THE ELECTRICAL CIRCUIT TO WHICH
THE COMPRESSOR IS CONNECTED PROVIDES PROPER
ELECTRICAL GROUNDING, CORRECT VOLTAGE AND
ADEQUATE FUSE PROTECTION.
MGP-SL10120H-2A
4—ENG
HAZARD
RISK FROM MOVING PARTS
WHAT CAN HAPPEN
MOVING PARTS SUCH AS THE PULLEY, FLYWHEEL AND BELT
CAN CAUSE SERIOUS INJURY IF THEY COME INTO CONTACT
WITH YOU OR YOUR CLOTHING.
ATTEMPTING TO OPERATE COMPRESSOR WITH DAMAGED
OR MISSING PARTS OR ATTEMPTING TO REPAIR COMPRESSOR WITH PROTECTIVE SHROUDS REMOVED CAN
EXPOSE YOU TO MOVING PARTS AND CAN RESULT IN
SERIOUS INJURY.
RISK OF BURNS
WHAT CAN HAPPEN
TOUCHING EXPOSED METAL SUCH AS THE COMPRESSOR
HEAD OR OUTLET TUBES, CAN RESULT IN SERIOUS BURNS.
HOW TO PREVENT IT
NEVER OPERATE THE COMPRESSOR WITH GUARDS OR
COVERS WHICH ARE DAMAGED OR REMOVED.
ANY REPAIRS REQUIRED ON THIS PRODUCT SHOULD BE
PERFORMED BY AUTHORIZED SERVICE CENTER PERSONNEL.
HOW TO PREVENT IT
NEVER TOUCH ANY EXPOSED METAL PARTS ON COMPRESSOR DURING OR IMMEDIATELY AFTER OPERATION. COMPRESSOR WILL REMAIN HOT FOR SEVERAL MINUTES AFTER
OPERATION.
DO NOT REACH AROUND PROTECTIVE SHROUDS OR ATTEMPT
MAINTENANCE UNTIL UNIT HAS BEEN ALLOWED TO COOL.
RISK OF FALLING
WHAT CAN HAPPEN
A PORTABLE COMPRESSOR CAN FALL FROM A TABLE,
WORKBENCH OR ROOF CAUSING DAMAGE TO THE COM-
PRESSOR AND COULD RESULT IN SERIOUS INJURY OR
DEATH TO THE OPERATOR.
RISK OF PROPERTY DAMAGE WHEN TRANSPORTING
COMPRESSOR
(Fire, Inhalation, Damage to Vehicle Surfaces)
WHAT CAN HAPPEN
OIL CAN LEAK OR SPILL AND COULD RESULT IN FIRE OR
BREATHING HAZARD, SERIOUS INJURY OR DEATH CAN RESULT.
OIL LEAKS WILL DAMAGE CARPET, PAINT OR OTHER SURFACES
IN VEHICLES OR TRAILERS.
HOW TO PREVENT IT
ALWAYS OPERATE COMPRESSOR IN A STABLE SECURE
POSITION TO PREVENT ACCIDENTAL MOVEMENT OF THE
UNIT. NEVER OPERATE COMPRESSOR ON A ROOF OR
OTHER ELEVATED POSITION. USE ADDITIONAL AIR HOSE
TO REACH HIGH LOCATIONS.
HOW TO PREVENT IT
ALWAYS PLACE COMPRESSOR ON A PROTECTIVE MAT WHEN
TRANSPORTING TO PROTECT AGAINST DAMAGE TO VEHICLE
FROM LEAKS. REMOVE COMPRESSOR FROM VEHICLE IMMEDIATELY UPON ARRIVAL AT YOUR DESTINATION.
ESW-99 — 9/26/99ESW-99 — 9/26/99
ESW-99 — 9/26/99
ESW-99 — 9/26/99ESW-99 — 9/26/99
5—ENG
MGP-SL10120H-2A
SPECIFICATIONS
Refer to cover page for the specifications of your compressor. Use only a fuse or circuit breaker that is the same rating
as the branch circuit the air compressor is operated on. If the compressor is connected to a circuit protected by fuses,
use dual element time delay fuses, as noted in specification chart.
Improper electrical installation of this product
may void its warranty and your fire insurance.
Have circuit wiring performed by qualified personnel such as a licensed electrician who is
familiar with the current national electric code
and any prevailing local electrical codes.
GLOSSARY
CFM:CFM:
CFM: Cubic feet per minute.
CFM:CFM:
SCFM:SCFM:
SCFM: Standard cubic feet per minute; a unit of
SCFM:SCFM:
measure of air delivery.
PSIG: PSIG:
PSIG: Pounds per square inch gauge; a unit of measure
PSIG: PSIG:
of pressure.
ASME:ASME:
ASME: American Society of Mechanical Engineers;
ASME:ASME:
made, tested, inspected and registered to meet the
standards of the ASME.
California CodeCalifornia Code
California Code: Unit may comply with California
California CodeCalifornia Code
Code 462 (l) (2)/(M) (2). Specification/Model Label is on
the side of the tank on units that comply with California
Code.
DUTY CYCLE
Cut-In Pressure:Cut-In Pressure:
Cut-In Pressure: While the motor is off, air tank
Cut-In Pressure:Cut-In Pressure:
pressure drops as you continue to use your accessory.
When the tank pressure drops to a certain low level the
motor will restart automatically. The low pressure at
which the motor automatically re-starts is called “cutin pressure.”
Cut-Out Pressure: Cut-Out Pressure:
Cut-Out Pressure: When you turn on your air com-
Cut-Out Pressure: Cut-Out Pressure:
pressor and it begins to run, air pressure in the air tank
begins to build. It builds to a certain high pressure
before the motor automatically shuts off - protecting
your air tank from pressure higher than its capacity. The
high pressure at which the motor shuts off is called "cutout pressure."
To Lock Out Power:To Lock Out Power:
To Lock Out Power: Place a lock on the line power
To Lock Out Power:To Lock Out Power:
switch so no one else can turn on the power.
All DeVilbiss Air Power manufactured air compressors
should be operated on not more than a 50% duty cycle.
This means an air compressor that pumps more than
50% of one hour, is considered misuse, because the air
MGP-SL10120H-2A
compressor is undersized for the required air demand.
Maximum compressor pumping time per hour is 30
minutes.
6—ENG
GENERAL INFORMATION
You have purchased a complete compressor outfit consisting of an air compressor, air tank, electric motor, and
associated controls and instruments. The outfit you have
selected is a stationary model and contains a two stage
air compressor pump.
Your new compressor outfit can be used for operating
paint sprayers, air tools, grease guns, air brushes, caulking guns, sandblasters, inflating tires, etc.
An air pressure regulator is usually necessary for most
applications. An air line filter is normally required for
removal of moisture and oil vapor in compressed air when
a paint spray gun is used.
An in-line lubricator is often required for air tools to prolong
tool life.
ON-RECEIPT INSPECTION
Separate air transformers which combine the functions of
air regulation and/or moisture and dirt removal should
be used where applicable.
A regularly scheduled program of preventive maintenance will help provide the long life that has been
designed into your compressor outfit. Before operating
or performing any maintenance on your compressor, refer
to this manual. To keep your compressor in good working
order, refer to these publications often and perform
preventive maintenance steps as recommended.
Each air compressor outfit is carefully checked before
shipment. With improper handling, damage may result in
transit and cause problems in compressor operation.
Immediately upon arrival, check equipment for both
concealed and visible damages to avoid expenses being
incurred to correct such problems. This should be done
regardless of any visible signs of damage to the shipping
container. Report any damages to carrier and arrange for
inspection of goods immediately.
For the location or a listing of the nearest DeVilbiss Air
Power Authorized Warranty Service Center, call our toll
free number at 1-800-888-2468.
7—ENG
MGP-SL10120H-2A
DESCRIPTION OF OPERATION
Drain Valve:Drain Valve:
Drain Valve: At the base of the air tank to drain
Drain Valve:Drain Valve:
condensation at the end of each use.
ON/AUTO-OFF Switch:ON/AUTO-OFF Switch:
ON/AUTO-OFF Switch: Turn this switch ON to
ON/AUTO-OFF Switch:ON/AUTO-OFF Switch:
provide automatic power to the pressure switch and OFF
to remove power.
Air Intake Filter:Air Intake Filter:
Air Intake Filter: This filter is designed to clean air
Air Intake Filter:Air Intake Filter:
coming into the pump. This filter must always be clean
and ventilation openings free from obstructions. See
"Maintenance".
Air Compressor Pump:Air Compressor Pump:
Air Compressor Pump: In two stage compressors, air
Air Compressor Pump:Air Compressor Pump:
is first compressed to an intermediate pressure in the
large bore cylinder, and after passing through an intercooler, the air is further compressed to a higher pressure
in the smaller bore cylinder. This process continues until
the air tank pressure reaches the factory set cutoff
pressure. At that point the pressure switch shuts the
electric motor off.
Check Valve:Check Valve:
Check Valve: When the air compressor is operating,
Check Valve:Check Valve:
the check valve is "open", allowing compressed air to
enter the air tank. When the air compressor reaches
"cut-out" pressure, the check valve "closes", allowing
air pressure to remain inside the air tank.
Pressure Release Valve:Pressure Release Valve:
Pressure Release Valve: The pressure release valve
Pressure Release Valve:Pressure Release Valve:
located on the side of the pressure switch, is designed
to automatically release compressed air from the compressor head and the outlet tube when the air compressor reaches "cut-out" pressure or is shut off. If the air
is not released, the motor will try to start, but will be
unable to. The pressure release valve allows the motor
to restart freely. When the motor stops running, air will
be heard escaping from the valve for a few seconds. No
air should be heard leaking when the motor is running.
Pressure Switch: Pressure Switch:
Pressure Switch: The pressure switch automatically
Pressure Switch: Pressure Switch:
starts the motor when the air tank pressure drops below
the factory set "cut-in" pressure. It stops the motor
when the air tank pressure reaches the factory set "cutout" pressure.
Shut-off Valve:Shut-off Valve:
Shut-off Valve: Turn the knob counterclockwise to
Shut-off Valve:Shut-off Valve:
open the valve and clockwise to close.
Air Tank Safety Valve:Air Tank Safety Valve:
Air Tank Safety Valve: If the pressure switch does not
Air Tank Safety Valve:Air Tank Safety Valve:
shut off the air compressor at its cut-out pressure
setting, the safety valve will protect against high pressure by "popping off" at its factory set pressure (slightly
higher than the pressure switch cut-out setting).
Aftercooler Safety Valve:Aftercooler Safety Valve:
Aftercooler Safety Valve: On two stage compressor
Aftercooler Safety Valve:Aftercooler Safety Valve:
units, safety valve is provided to prevent over-pressurization of the aftercooler. The valve will protect the
aftercooler by "popping off" at its factory set pressure.
Regulator:Regulator:
Regulator: An air pressure regulator or a separate air
Regulator:Regulator:
transformer which combines the functions of air regulation and/or moisture and dirt removal is recommended
for most applications.
Tank Pressure Gauge:Tank Pressure Gauge:
Tank Pressure Gauge: The tank pressure gauge
Tank Pressure Gauge:Tank Pressure Gauge:
indicates the reserve air pressure in the tank. On outfits
with no pressure regulator, this is also the pressure
available at the air outlet.
MGP-SL10120H-2A
8—ENG
INSTALLATION AND BREAK-IN PROCEDURES
Location of the Air Compressor
THE PUMP ASSEMBLY DOES NOT PROVIDE ADEQUATE STABILITY OR SUPPORT
FOR LIFTING THE UNIT. IF THE OUTFIT
MUST BE MOVED, USE THE TANK FOR
LIFTING.
This compressor should be permanently mounted in
place on a level floor. Operate the air compressor in a
clean, dry and well ventilated area. The air intake filter
must be kept clear of obstructions which could reduce air
delivery of the air compressor. The air compressor
should be located at least 12" away from walls or other
obstructions that could interfere with the flow of air
through the fan bladed flywheel. The air compressor
crankcase and head are designed with fins to provide
proper cooling.
The flywheel side of the outfit should be placed toward
the wall and protected with a totally enclosed belt guard.
In no case should the flywheel be closer than 12 to 18
inches from the wall or other obstruction that will interfere
with the flow of air through the fan bladed flywheel. The
area should allow space on all sides for air circulation
and for ease of normal maintenance. Keep the outfit
away from areas which have dirt, vapor and volatile fumes
in the atmosphere which may clog and gum the intake
filter and valves, causing inefficient operation. Where this
is not practical a remote air intake is recommended.
Air Compressor Anchoring
Methods
VIBRATION CAN WEAKEN THE AIR TANK
AND CAUSE AN EXPLOSION. THE COMPRESSOR MUST BE PROPERLY MOUNTED
AS ILLUSTRATED BELOW.
FLAT WASHER
ISOLATOR
WASHER
(supplied)
Anchoring of Horizontal Unit
LAG SCREW
(NOT SUPPLIED)
TORQUE TO
5 TO 10 FT-LB
Note
Where a remote air intake is used, enlarge the size of the air intake piping by
one pipe size for each 10 feet of length.
If humidity is high, an air filter can be installed to
remove excessive moisture. Closely follow instructions packaged with the filter for proper installation. It
must be installed as close as possible to the accessory.
The air compressor should be as near to air outlets as
possible in order to avoid long pipe lines. Do not place
the air compressor where heat is excessive.
9—ENG
Horizontal Units
Horizontal air compressors must be bolted to the floor.
Bolting holes are provided in the base feet. Mount the
air compressor on a solid, level foundation. Support
compressor weight evenly on all four feet. Solid shims
may be used if necessary.
MGP-SL10120H-2A
INSTALLATION AND BREAK-IN PROCEDURES
Wiring Instructions
If your compressor unit is not equipped with a plug-in type
power cord, perform electrical wiring according to the
following instructions:
IMPROPER ELECTRICAL GROUNDING CAN
RESULT IN A RISK OF ELECTRICAL SHOCK.
WIRING SHOULD BE DONE BY A LICENSED
ELECTRICIAN IN ACCORDANCE WITH NATIONAL AND LOCAL CODES AND ORDINANCES.
Install the compressor outfit as close to the main power
supply as possible. This practice will avoid using long
lengths of electrical wiring for the power supply which can
cause power loss to the motor. When connecting wires
make sure that:
1.The amperage rating of the electrical box is adequate.
Refer to the Specification Chart (cover page) for your
air compressor outfit.
2.The supply line has the same electrical characteristics
(voltage, cycle, and phase) as motor.
Wiring must be such that full motor nameplate voltage
plus or minus 10%, is available at the motor terminals
during starting. Refer to local codes for recommended
wire sizes for correct wire size and maximum wire run;
undersize wire causes high amp draw and overheating to
the motor.
Electrical wiring must be located away
from hot surfaces such as the compressor
head, compressor cylinder, or compressor outlet tube.
Voltage and Circuit Protection
Refer to The Specification Chart for the voltage and circuit
protection requirements of your compressor. Use only a
fuse or circuit breaker that is the same rating as the branch
circuit the air compressor is operated on. If the compressor
is connected to a circuit protected by fuses, use only dual
element time delay fuses. See Specification Chart.
Wiring of Compressor Units
Typical Wiring of Compressor Units
With more than 80 Gallons Capacity
IF REQUIREDIF REQUIRED
IF REQUIRED
IF REQUIREDIF REQUIRED
Typical schematic subject to all changes as dictated by
local electrical codes and authorities.
NOTE: THESE OUTFITS DO NOT INCLUDE ANY
MGP-SL10120H-2A
WIRING BECAUSE OF VARIOUS
INSTALLATION REQUIREMENTS.
10—ENG
INSTALLATION AND BREAK-IN PROCEDURES
Air Filter Installation
To install air filter:
Insert threaded end of the air filter assembly into elbow
and tighten until snug.
Break-In Procedures
Serious damage may result if the following break-in instructions are not
closely followed.
The Break-In Procedure is required when:
A. New compressor is put into service.
B. Check valve is replaced
C. New pump is installed on tank.
1.Recheck compressor wiring. Make sure wires are
secure at all terminal connections. Free all contacts of
loose wire cuttings, etc.
Do not operate compressor without air
filter assembly installed as this will
cause damage to the compressor.
Additional Regulators and
Controls
Since the air tank pressure is usually greater than that
which is needed, a separate regulator is usually employed
to control the air pressure ahead of any individual air driven
device.
Separate air transformers that combine the functions of air
regulation and moisture and dirt removal should be used
where applicable.
Lubrication and Oil
2.Open the air outlet valve fully to permit air to escape
and prevent air pressure build-up in the tank during the
break-in period.
3.Position the fuse disconnect or circuit breaker to the
ON position and, if equipped, turn the ON/AUTO-OFF
switch on the pressure switch to the ON position.
4. Run the compressor for 30 minutes. Make sure the air
outlet, or globe valve, is open and there is no tank
pressure build-up.
5.Check for excessive vibration and noise. Adjust air
compressor belt guard as necessary to eliminate
chatter. Re-adjust or shim the air compressor feet, if
necessary, for proper level.
6. Close the outlet valve and let air compressor pump up
to "cut-out pressure". Turn the air compressor off and
check oil level. Add oil if necessary. Connect air hose
to air outlet adapter.
7. Check all air line fittings and connections/piping for air
leaks by applying a soap solution. Correct as necessary. Even minor leaks can cause this air compressor
to overwork, resulting in premature breakdown or
inadequate performance.
Multi-viscosity motor oils like 10W30, should
not be used in an air compressor. They
leave carbon deposits on critical components, thus reducing performance and compressor life. Use air compressor oil only.
See Maintenance for oil recommendations.
Compressors are shipped without oil. A
small amount of oil may be present in the
pump upon receipt of the air compressor.
This is due to plant testing and does not
mean that the pump contains oil. Do not
attempt to operate in order to check wiring
or for any reason without first adding oil to
the crankcase. Serious damage to the pump
can result from even very limited use without oil. Fill crankcase with recommended
oil before operating.
Remove the oil fill plug and fill the crankcase with recommended oil. Refer to the Service Instructions in this manual
for the specific oil recommended for use in your compressor unit. Replace the oil fill plug. Always fill to middle of
sight glass.
11—ENG
MGP-SL10120H-2A
INSTALLATION AND BREAK-IN PROCEDURES
Piping
Plastic or PVC pipe is not designed for use
with compressed air. Regardless of its indicated pressure rating, plastic pipe can burst
from air pressure. Use only metal pipe for
air distribution lines.
NoteNote
Note
NoteNote
Where a remote air intake is used, enlarge the size of the air intake piping by
one pipe size for each 10 feet of length.
A typical compressed air distribution system as shown
below should be of sufficient pipe size to keep the
pressure drop between the supply and point of use to a
minimum. All pipes and fittings used must be certified
safe for the pressures involved. Pipe thread sealant must
be used on all threads, and all joints are to be made up
tight, since small leaks in the piping system are the
largest single cause of high operating costs.
All piping should be sloped to an accessible drain point
and all outlets should be taken from the top of the main
distribution air line so that moisture cannot enter the
outlet.
The main distribution air line should not be smaller than
the compressor air discharge valve outlet. A smaller line
will restrict the flow of air. If piping is over 100 feet long,
or if required air flow will exceed 15 SCFM, use 3/4"
piping.
NoteNote
Note
NoteNote
For underground installation, bury air
lines below the frost line and avoid
pockets where condensation can gather
and freeze. Apply pressure before underground lines are covered to make
sure all pipe joints are free from leaks.
It is recommended that a flexible coupling be installed
between the air discharge valve outlet and main air
distribution line to allow for vibration.
To remove dirt, oil and water, install a separator in the
main distribution line. Install separator a minimum of 5 to
6 feet from compressor to allow the air to cool to room
temperature before passing through the separator. Additional separators or filters may be used depending on the
application.
Liquid water occurs naturally in air lines as a result of
compression. Moisture vapor in ambient air is concentrated when pressurized and condenses when cooled in
downstream air piping. Compressed air dryers reduce
the water vapor concentration and prevent liquid water
formation in compressed air lines. Dryers are a necessary companion to filters, aftercoolers, and automatic
drains for improving the productivity of compressed air
systems.
Water and water vapor removal increases the efficiency
of air operated equipment, reduces contamination and
rusting, increases the service life of pneumatic equipment and tools, prevents air line freeze-ups, and reduces
product rejects. The use of dryers and filters are recommended when these moisture related problems are
reported to our factory or distributor service department.
MGP-SL10120H-2A
12—ENG
OPERATING PROCEDURES
1. Before attaching an air hose or accessory, make sure the
outlet valve is in the closed position. On units equipped
with a pressure switch lever make sure the switch is in the
OFF position.
Compressed air from the outfit may contain
water condensation and oil mist. Do not spray
unfiltered air at an item that could be damaged by moisture or oil mist. Some air operated tools or devices may require filtered air.
Read instructions for air tool or device.
2.Attach regulator, hose and accessory. On models
without an air pressure regulator, one must be installed
before using accessories.
TOO MUCH AIR PRESSURE CAUSES A HAZARDOUS RISK OF BURSTING. CHECK THE
MANUFACTURER'S MAXIMUM PRESSURE
RATING FOR AIR TOOLS AND ACCESSORIES.
THE REGULATOR OUTLET PRESSURE MUST
NEVER EXCEED THE MAXIMUM PRESSURE
RATING.
3. Turn the compressor on and allow tank pressure to build.
On units equipped with a pressure switch lever, place the
switch in the ON-AUTO position. The motor will stop
when tank pressure reaches "cut-out pressure".
When You Are Finished:
6. Turn the compressor unit off.
7. Turn the regulator counterclockwise and set the outlet
pressure to zero.
8. Remove the air tool or accessory.
9. Open the regulator and allow the air to slowly bleed
from the tank. Close the regulator when tank pressure
is approximately 20 psi.
10. Open the drain cock valve underneath the tank and
drain water from air tank. Collect the water in a suitable
containter. Continue operating unit until all moisture is
removed from the air tank.
DRAIN TANK DAILY. WATER WILL CONDENSE
IN THE AIR TANK. IF NOT DRAINED, THE WATER WILL CORRODE AND WEAKEN THE AIR
TANK, CAUSING A RISK OF AIR TANK RUPTURE. THE AIR TANK MUST BE DRAINED PROPERLY.
11. After the water has been drained, close the drain cock.
- if the compressor is under continuous use - drain at
least once each day.
4. Open the outlet valve.
5. If an air pressure regulator is in use, open the regulator by
turning it clockwise. Adjust the regulator to the correct
pressure setting. Your outfit is ready for use.
- if the compressor is only used occasionally - drain
after each use.
Note
If drain cock valve is clogged, release air pressure in air tank. The drain cock valve can then
be removed, cleaned and reinstalled.
13—ENG
MGP-SL10120H-2A
MAINTENANCE
UNIT CYCLES AUTOMATICALLY WHEN POWER IS ON. DURING MAINTENANCE, YOU COULD BE
EXPOSED TO VOLTAGE SOURCES, COMPRESSED AIR OR MOVING PARTS. PERSONAL INJURIES
CAN OCCUR. DISCONNECT POWER SOURCE AND BLEED OFF ALL AIR TANK PRESSURE BEFORE
DOING ANY MAINTENANCE OR REPAIR. NEVER OPERATE THE UNIT WITH THE BELT GUARD
REMOVED.
To ensure efficient operation and longer life of the air compressor outfit, a routine maintenance schedule should be
prepared and followed. The following routine maintenance schedule is geared to an outfit in a normal working environment
operating on a daily basis. If necessary, the schedule should be modified to suit the conditions under which your
compressor is used. The modifications will depend upon the hours of operation and the working environment. Compressor
outfits in an extremely dirty and/or hostile environment will require a greater frequency of all maintenance checks.
A clean air compressor runs cooler and provides longer service. Clean or blow off fins and any other parts of the air
compressor that collect dust or dirt. Do not place rags, containers or other material on or against the ventilation openings
in the belt guard. Adequate ventilation is necessary to maintain proper air compressor operating temperature.
Routine Maintenance Schedule
Every 8 Hours of Operation
1. Check oil level. Add if necessary.
2. Drain water from the air tank, any moisture
separators or transformers.
Overfilling with oil will cause premature
compressor failure. Do not overfill.
3. Check for any unusual noise and/or vibration.
4. Manually check all safety valves to make sure they
are operating properly.
5. Inspect for oil leaks and repair any leaks found.
6. Clean and inspect the air intake filter; replace if
necessary.
Every 40 Hours of Operation
1. Inspect condition of drive belt; replace if
necessary.
First 100 Hours of Operation
1. Drain and refill compressor crankcase with clean
oil. Refer to Service Instructions for recommended
oils.
2. Increase frequency of oil changes if humidity or
operating conditions are extreme.
Every 160 Hours of Operation
1. Check drive belt tension; adjust if necessary. (Refer
to Service Instructions in this manual.)
2. Inspect air lines and fittings for leaks; correct as
necessary.
3. Check the alignment of the motor pulley to the fly
wheel. If necessary, align to within 1/32 inch on
centerline.
Every 300 Hours of Operation
1. Drain and refill compressor crankcase with clean
oil. Refer to Service Instructions for recommended
oils.
2. Increase frequency of oil changes if humidity or
operating conditions are extreme.
Each Year of Operation (2000 Hours or if a
Problem is Suspected)
Check condition of air compressor pump intake and
exhaust valves. Replace if damaged or worn out.
MGP-SL10120H-2A
14—ENG
SERVICE INSTRUCTIONS
Air Filter - Inspection and
Replacement
NOTENOTE
NOTE
NOTENOTE
Keep the air filter clean at all times. Do
not operate the compressor with the air
filter removed.
A dirty air filter will not allow the compressor to operate
at full capacity. Before you use the compressor, check
the air filter to be sure it is clean. If it is dirty, replace it
with a new filter.
Oil - Checking and Changing
Overfilling with oil will cause premature
compressor failure. Do not overfill.
1. Check oil level in compressor crankcase before
each use. The oil level should be to the middle of
the oil sight glass.
2. Replace the oil after initial 100 hours of operation
- thereafter, every 300 hours of operation.
3. Remove the oil fill and drain plugs. Collect the oil
in a suitable container.
4. Replace the oil drain plug and refill the crankcase
with recommended oil. Always fill to middle of sight
glass.
Oil Chart
Room or Ambient
Temperature
Cold Climates - 10º F
Moderate Climates 30º to 80º F
Hot Climates - 80º F
A compressor grade non-detergent oil should be used.
Most automotive detergent oils cause excessive carbon
buildup and should not be used. Please note that all units
run at a constant speed (not start and stop) and should
be lubricated by Rarus 847, Shell turbo 100, or Anderol
synthetic compressor oil. Do not use synthetic oil for the
first 300 hours. All units should be broken in on petroleum based oil.
Oil
Weight
20 Wt.
30 Wt.
40 Wt.
Type
Reciprocating
Non-detergent
petroleum based
compressor rated or
better oil
Check Valve - Inspection and
Replacement
Remove and inspect the check valve at least once a
year or more often if the compressor is heavily used.
Moisture and other contaminants in the hot compressed
air will cause an accumulation of a carbon-like residue
on the working parts. If the valve has heavy carbon
build-up, it should be replaced. Use the following procedure to inspect, clean or replace the check valve.
NoteNote
Note
NoteNote
It is important to maintain the proper oil
level. A low oil level reduces proper cylinder wall lubrication and increases ring
wear.
5. Replace the oil fill plug.
6. Start the compressor outfit and run for several
minutes. Shut the compressor down and check the
oil level. If necessary, add more oil.
1. Turn compressor off and disconnect or lock out
power source.
2. Release air pressure from the air tank.
3. Loosen the top and bottom tube nuts and remove the
outlet tube.
4. Loosen pressure release tube nuts, disconnect from
check valve and move tube aside.
5. Unscrew the check valve with a wrench.
15—ENG
MGP-SL10120H-2A
SERVICE INSTRUCTIONS
6. Check that the valve disc moves freely and that the
spring holds the disc in the upper, closed position.
The check valve may be cleaned with a solvent.
7. Apply sealant to the check valve threads. Reinstall
the check valve. Do not overtighten.
8. Replace the outlet tube and tighten top and bottom
nuts. Do not overtighten.
9. Replace the pressure release tube and tighten nuts.
Do not overtighten.
Safety Valve - Inspection and
Replacement
SERIOUS INJURY OR DAMAGE MAY OCCUR
IF PARTS OF THE BODY OR LOOSE ITEMS
GET CAUGHT IN MOVING PARTS. NEVER
OPERATE THE OUTFIT WITH THE BELT
GUARD REMOVED. THE BELT GUARD
SHOULD BE REMOVED ONLY WHEN THE
COMPRESSOR POWER IS DISCONNECTED.
Adjusting Belt Tension
Adjust belt tension as described below.
For compressors with a motor slide mount, adjust belt
tension as follows:
1. Slide motor away from compressor until desired
tension is obtained.
IF THE SAFETY VALVE DOES NOT WORK
PROPERLY, OVER-PRESSURIZATION MAY
OCCUR, CAUSING AIR TANK RUPTURE OR
EXPLOSION. OCCASIONALLY PULL THE
RING ON THE SAFETY VALVE TO MAKE
SURE THAT THE SAFETY VALVE OPERATES FREELY. IF THE VALVE IS STUCK OR
DOES NOT OPERATE SMOOTHLY, IT MUST
BE REPLACED WITH A VALVE HAVING THE
SAME PRESSURE RATING.
The safety valve is set at the factory to a pressure
approximately 15 pounds higher than the rated pressure
of the outfit. If the pressure switch malfunctions and does
not shut off the motor automatically at maximum tank
pressure, the safety valve will protect the air tank against
excessive air pressure by popping off at its preset
pressure.
On two stage compressors, the belt should deflect
1/2" at midway between the pulley and the flywheel.
MGP-SL10120H-2A
2. Tighten two outside cap screws enough to hold the
motor in place for checking pulley and flywheel
alignment.
3. Tighten all four mounting screws to 20-25 ft.-lbs.
16—ENG
SERVICE INSTRUCTIONS
Motor Pulley and Flywheel
Alignment
1. Remove outer beltguard - To remove, loosen and
remove beltguard screws located at top of beltguard.
Insert a flat bladed screwdriver and pry beltguard
apart.
2. Place a straight edge along the outside face of the
compressor flywheel to check alignment of V-belt
grooves. (See figure below for proper alignment.)
3. If the belt grooves aren't aligned, continue with step
4 of this procedure. If the belt grooves are aligned,
continue with step 6 of this procedure.
4. Loosen pulley set screw and adjust pulley until it is in
proper alignment.
5. Tighten pulley set screw to 145-165 in.-lbs.
6. Reinstall belt guard.
Additional Service
Disassembly or service of the air compressor beyond
what is covered in this manual is not recommended.
If additional service is required, contact your nearest
Authorized Warranty Service Center.
STORAGE OF COMPRESSOR OUTFIT
1. Review the Maintenance section on the preceding
pages and perform scheduled maintenance as
necessary. Drain the water from the air tank.
2. Turn compressor off and disconnect or lock out
power source.
3. Remove any air tool or accessory.
4. Protect the electrical cord and/or air hose from
damage (such as being stepped on or run over).
5. Store the compressor in a clean and dry location.
17—ENG
MGP-SL10120H-2A
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