DeVilbiss MG7-OFTWIN Configuration guide

DeVilbiss Air Power Company • 213 Industrial Drive • Jackson, TN 38301-9615
MG7-OFTWIN REV. 11/5/98
SAFETY GUIDELINES ....................................................... 1
WARRANTY STATEMENT ................................................. 2
WARNING CHART ......................................................... 3-4
GLOSSARY ........................................................................ 5
DUTY CYCLE ..................................................................... 5
GENERAL INFORMATION ................................................ 5
ON-RECEIPT INSPECTION .............................................. 5
DESCRIPTION OF OPERATION ....................................... 6
ASSEMBLY (PORTABLE UNITS) ...................................... 6
Tools Needed for Assembly ......................................... 6
Installing Wheels, Handles
Rubber Foot Strip......................................................... 6
INSTALLATION AND BREAK-IN
PROCEDURES .............................................................. 7-9
Location of Air Compressor ........................................ 7
Removal of Shipping Boards and
Installation for Stationary Unit .................................... 7
Lubrication and Oil ..................................................... 7
Extension Cords ......................................................... 7
Voltage and Current Protection .................................. 8
Piping ......................................................................... 8
Grounding Instructions – (Portable) ........................... 8
Additional Regulators & Controls ............................... 8
Break-in Procedures ................................................... 8
Wiring Instructions-(Stationary) ................................. 9
Grounding Instructions (Stationary) ........................... 9
OPERATING PROCEDURES ........................................... 9
Daily Start-up Checklist .............................................. 9
MAINTENANCE ................................................................ 10
Air Filter - Inspection and Replacement ...................... 10
Safety Valve - Inspection ............................................ 10
Motor .......................................................................... 10
CheckValve Replacement ........................................... 10
STORAGE .......................................................................... 11
TROUBLESHOOTING GUIDE .................................... 12-13
TABLE OF CONTENTS
SAFETY GUIDELINES - DEFINITIONS
Information for preventing damage to
equipment.
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 informa-
tion, we use the symbols to the
right. Please read the manual and
pay attention to these sections.
URGENT SAFETY INFORMATION - A HAZARD
THAT WILL CAUSE SERIOUS INJURY OR LOSS
OF LIFE.
Information that you should pay spe-
cial attention to.
IMPORTANT SAFETY INFORMATION - A
HAZARD THAT MIGHT CAUSE SERIOUS
INJURY OR LOSS OF LIFE.
Callour Toll FreeNumber 1-800-888-2468, Ext2, then1, toobtainthe locationof thenearestAuthorized Service
Center for ordering repair parts and for warranty repairs.
When ordering repair parts from your local Authorized Service Center, always give the following information:
• Model number of your compressor
• Part number and description of the item you wish to purchase
Retain Original Sales Receipt as Proof of Purchase for Warranty Repair Work.
GENERAL MANUAL FOR
PERMANENTLY LUBRICATED
TWIN CYLINDER AIR COMPRESSORS

2 — ENG
❏Retain original cash register sales receipt as proof of purchase for warranty work.
❏Use reasonable care in the operation and maintenance of the product as described in the Owners Manual(s).
❏Deliver or ship the product to the nearest DeVilbiss Air Power Authorized Warranty Service Center.
Freight costs, if any, must be paid by the purchaser.
❏Air compressors with 60 and 80 gallon tanks only will be inspected at the site of installation. Contact the nearest
Authorized Warranty Service Center, that provides on-site service calls, for service call arrangement.
❏If the purchaser does not receive satisfactory results from the Authorized Warranty Service Center, the purchaser
should contact DeVilbiss Air Power Company.
❏Merchandise sold as reconditioned, floor models and/or display models. Any damaged or incomplete equipment
sold "as is".
❏Merchandise used as "rental" equipment.
❏Merchandise that has become inoperative because of ordinary wear, misuse, freeze damage, use of improper
chemicals, negligence, accident, improper and/or unauthorized repair or alterations including failure to operate
the product in accordance with the instructions provided in the Owners Manual (s) supplied with the product.
*Air Tools: O-Rings and driver blades are considered ordinary wear parts, therefore, they are warranted for a
period of 45 days from the date of purchase.
❏An air compressor that pumps air more than 50% during a one hour period is considered misuse because
the air compressor is undersized for the required air demand. Maximum compressor pumping time per hour is
30 minutes.
❏Merchandise sold by DeVilbiss Air Power which has been manufactured by and identified as the product of
another company. The product manufacturer's warranty will apply.
❏Repair and transportation costs of merchandise determined not to be defective.
❏Cost associated with assembly, required oil, adjustments or other installation and start-up cost.
❏ANY INCIDENTAL, INDIRECT OR CONSEQUENTIAL LOSS, DAMAGE, OR EXPENSE THAT MAY RESULT
FROM ANY DEFECT, FAILURE OR MALFUNCTION OF THE PRODUCT. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
❏IMPLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, ARE LIMITED TO ONE YEAR FROM THE DATE OF ORIGINAL PURCHASE. Some states do not allow
limitations on how long an implied warranty lasts, so the above limitations may not apply to you.
LIMITED WARRANTY
ONE YEAR FROM DATE OF PURCHASE
All merchandise manufactured by DeVilbiss Air Power Company is warranted to be free of defects in workmanship
andmaterial which occurduring the firstyearfrom thedateof purchase bythe original purchaser(initial user). Products
covered under this warranty include: air compressors, *air tools, accessories, service parts, pressure washers, and
generators used in consumer applications (i.e., personal residential household usage only).
Air compressors, *air tools, accessories, service parts, pressure washers, and generators used in commercial
applications (income producing) are covered by a 90 day warranty.
DeVilbissAirPowerwillrepairorreplace, at DeVilbiss's option, products or components which have failed within the
warranty period. Repair or replacement, and service calls on 60 and 80 gallon air compressors, will be handled by
Authorized Warranty Service Centers and will be scheduled and serviced according to the normal work flow and
business hours at the service center location, and depending on the availability of replacement parts.
All decisions of DeVilbiss Air Power Company with regard to this policy shall be final.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
RESPONSIBILITY OF ORIGINAL PURCHASER (Initial User):
THIS WARRANTY DOES NOT COVER:
DeVilbiss Air Power Company
213 Industrial Drive • Jackson, TN 38301-9615 • Telephone: [phone] , Ext. 2 • FAX: [phone]
Form: SP-100-E - 4/25/96

3 — ENG
RISK OF BURSTING
RISK OF
EXPLOSION OR FIRE
RISK OF
ELECTRICAL SHOCK
AIR TANK
THE FOLLOWING CONDITIONS COULD LEAD
TO A WEAKENING OF THE TANK, AND RESULT IN
A VIOLENT TANK EXPLOSION:
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
PRESSURE SWITCH, SAFETY VALVE, OR
ANY OTHER COMPONENTS WHICH
CONTROL TANK PRESSURE.
ATTACHMENTS & ACCESSORIES
EXCEEDING THE PRESSURE RATING OF AIR
TOOLS, SPRAY GUNS, AIR OPERATED ACCES-
SORIES, TIRES AND OTHER INFLATABLES CAN
CAUSE THEM TO EXPLODE OR FLY APART, AND
COULD RESULT IN SERIOUS INJURY.
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 SERI-
OUS OVERHEATING AND COULD CAUSE FIRE.
YOUR AIR COMPRESSOR IS POWERED BY
ELECTRICITY. LIKE ANY OTHER ELECTRICALLY
POWERED DEVICE, IF IT IS NOT USED
PROPERLY IT MAY CAUSE ELECTRIC SHOCK.
DRAIN TANK DAILY OR AFTER EACH USE. IF
TANK DEVELOPS A LEAK, REPLACE IT
IMMEDIATELY WITH A NEW TANK OR NEW
COMPRESSOR OUTFIT.
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 SUBSTITU-
TIONS TO ALTER THE FACTORY SET
OPERATING PRESSURES.
FOLLOW THE EQUIPMENT MANUFACTURERS
RECOMMENDATION AND NEVER
EXCEED THE MAXIMUM ALLOWABLE PRES-
SURE RATING OF ATTACHMENTS. NEVER
USE COMPRESSOR TO INFLATE SMALL
LOW-PRESSURE OBJECTS SUCH AS
CHILDREN’S TOYS, FOOTBALLS,
BASKETBALLS. ETC.
ALWAYS OPERATE THE COMPRESSOR IN A
WELL VENTILATED AREA FREE OF COMBUS-
TIBLE MATERIALS, GASOLINE OR SOLVENT
VAPORS.
IF SPRAYING FLAMMABLE MATERIALS, LO-
CATE 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 COM-
PRESSOR.
NEVER PLACE OBJECTS AGAINST OR ON
TOP OF COMPRESSOR. OPERATE COM-
PRESSOR IN AN OPEN AREA AT LEAST 12
INCHES AWAY FROM ANY WALL OR
OBSTRUCTION THAT WOULD RESTRICT THE
FLOW OF FRESH AIR TO THE VENTILATION
OPENINGS.
NEVER OPERATE THE COMPRESSOR OUT-
DOORS WHEN IT IS RAINING OR IN WET
CONDITIONS.
NEVER OPERATE COMPRESSOR WITH
COVER COMPONENTS REMOVED OR DAM-
AGED.
HAZARD WHAT CAN HAPPEN HOW TO PREVENT IT
• SAVE THESE INSTRUCTIONS •
IMPORTANT SAFETY INSTRUCTIONS
IMPROPER OPERATION OR MAINTENANCE OF THIS PRODUCT COULD RESULT IN SERIOUS IN-
JURY AND PROPERTY DAMAGE. READ AND UNDERSTAND ALL WARNINGS AND OPERATING IN-
STRUCTIONS BEFORE USING THIS EQUIPMENT.
CONTINUE NEXT PAGE *

4 — ENG
HAZARD
RISK OF
ELECTRICAL SHOCK
(cont’d)
RISK FROM
FLYING OBJECTS
RISK TO BREATHING
RISK OF FALLING
RISK FROM
MOVING PARTS
RISK OF BURNS
WHAT CAN HAPPEN
REPAIRS ATTEMPTED BY UNQUALIFIED PER-
SONNEL 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 GROUNDING INSTRUCTIONS.
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 PER-
SONAL INJURY.
THE COMPRESSED AIR FROM YOUR COM-
PRESSOR IS NOT SAFE FOR BREATHING! THE
AIR STREAM MAY CONTAIN CARBON MONOX-
IDE, TOXIC VAPORS OR SOLID PARTICLES.
SPRAYED MATERIALS SUCH AS PAINT, PAINT
SOLVENTS, PAINT REMOVER, INSECTICIDES,
WEED KILLERS, ETC.. CONTAIN HARMFUL
VAPORS AND POISONS.
A PORTABLE COMPRESSOR CAN FALL FROM
A TABLE, WORKBENCH OR ROOF CAUSING
DAMAGE TO THE COMPRESSOR WHICH
COULD RESULT IN SERIOUS INJURY.
THE COMPRESSOR CYCLES AUTOMATICALLY
WHEN THE PRESSURE SWITCH IS IN THE ON/
AUTO POSITION.
MOVING PARTS CAN CAUSE SERIOUS INJURY
OR DAMAGE IF THEY COME INTO CONTACT
WITH YOU OR YOUR CLOTHING.
ATTEMPTING TO OPERATE OR REPAIR
COMPRESSOR WITH PROTECTIVE SHROUDS
REMOVED CAN EXPOSE YOU TO MOVING
PARTS AND ELECTRICAL SHOCK.
TOUCHING EXPOSED METAL SUCH AS THE
COMPRESSOR HEAD OR OUTLET TUBE CAN
RESULT IN SERIOUS BURNS.
HOW TO PREVENT IT
ANY ELECTRICAL WIRING OR REPAIRS RE-
QUIRED ON THIS PRODUCT SHOULD BE
PERFORMED BY AUTHORIZED SERVICE CEN-
TER 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 AD-
EQUATE FUSE PROTECTION.
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.
NEVER INHALE AIR FROM THE COMPRESSOR
EITHER DIRECTLY OR FROM A BREATHING
DEVICE CONNECTED TO THE COMPRESSOR.
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.
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.
ALWAYS TURN OFF THE COMPRESSOR, BLEED
PRESSURE FROM THE AIR HOSE AND TANK,
AND UNPLUG FROM ELECTRICAL OUTLET
BEFORE PERFORMING MAINTENANCE OR
ATTACHING TOOLS AND ACCESSORIES.
DO NOT REMOVE THE PROTECTIVE COVERS
FROM THIS PRODUCT. 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.
NEVER TOUCH ANY EXPOSED METAL PARTS
ON COMPRESSOR DURING OR IMMEDIATELY
AFTER OPERATION. COMPRESSOR WILL
REMAIN HOT FOR SEVERAL MINUTES AFTER
OPERATION.
TMPCPOL — 5/1/97

5 — ENG
DAMAGE:Each aircompressor outfit is carefully tested and
checkedbefore shipment. Withimproper handling, damagemay
result in transit and cause problems in compressor operation.
Immediately upon arrival, check equipment for both concealed
andvisible damages toavoid expensesbeing incurred tocorrect
such problems. This should be done regardless of any visible
signs of damage to the shipping container. If this product was
shipped directly to you, report any damages to carrier and
arrange for inspection of goods immediately.
Whenthe tankpressure dropsto a certain low level the motorwill
restart automatically. The low pressure at which the motor
automatically restarts is called “cut-in pressure.”
Cut-Out Pressure: When you turn on your air compressor 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. Thehigh pressure at which themotor shutsoff is called
“cut-out pressure.”
U.L.Listed:Products with the U.L. mark are listed by Underwrit-
ers Laboratories, Inc. (U.L.). Samples of these products have
been evaluated by U.L. and meet the applicable U.L. standards
for safety.
CFM: Cubic feet per minute.
SCFM: Standard cubic feet per minute; a unit of measure of air
delivery.
PSIG: Pounds per square inch gauge; a unit of measure of
pressure.
ASME: American Society of Mechanical Engineers; made,
tested,inspectedand registered tomeet the standardsofASME.
California Code: Unit may comply with California Code 462 (L)
(2)/(M) (2). Specification/model label is on the side of the tank on
units that comply with California Code.
Cut-InPressure: While the motor is off, air tank pressure drops
as you continue to use your accessory or air tool.
AllDeVilbiss Air Powermanufactured air compressorsshould be
operated on not more than a 50% duty cycle. This means an air
compressor that pumps air more than 50% of one hour
isconsidered misuse,because the air compressor is undersized
for the required air demand. Maximum compressor pumping
time per hour is 30 minutes.
You have purchased an air compressor unit consisting of a 2
cylinder, single-stage air compressor pump, an air tank, and
associated controls and instruments.
This air compressor requires no oil. Now you can enjoy all the
benefits of having an air compressor without ever having to
purchase, add or change oil.
Your air compressor can be used for operating paint spray
guns, air tools, caulking guns, grease guns, air brushes,
sandblaster, or inflating tires and plastic toys, spraying weed
killers, insecticides, etc. An air pressure regulator is necessary
for most of these applications.
Separate air transformers which combine the functions of air
regulation and/or moisture and dirt removal should be used
whereapplicable..
Separate air transformers which combine the functions of air
regulation and/or moisture and dirt removal should be used
whereapplicable.
GLOSSARY
DUTY CYCLE
GENERAL INFORMATION
ON-RECEIPT INSPECTION

6 — ENG
DESCRIPTION OF OPERATION
It may be necessary to brace or support
one end of the outfit when attaching the
wheels and the rubber foot strip because
theaircompressorwillhaveatendencyto
tip.
TOOLS NEEDED FOR ASSEMBLY
• a 3/8" open end wrench or socket to tighten handle screws• a 9/16" socket or open end wrench for attaching the
wheels or removing shipping boards
THE WHEELS AND HANDLE DO NOT PRO-
VIDEADEQUATECLEARANCE, STABILITY OR
SUPPORT FOR PULLING THE UNIT UP AND
DOWN STAIRS OR STEPS. THE UNIT
MUST BE LIFTED, OR PUSHED UP A RAMP.
Installing Wheels, Handles, Rubber Foot
Strip
1. Attach the handle to the compressor saddle by inserting
the handle inside the compressor saddle and lining up the
two bolt holes on each side. Install the four screws, two on
each side. Tighten securely.
2. Install one shoulder bolt and one nut for each wheel using
upper bolt hole for 30 and 33 gallon units. Tighten
securely. The outfit will sit level if the wheels are properly
installed.
3. Clean and dry air tank leg opposite wheels. Remove the
protective paper strip from the adhesive backed rubber
foot strip. Attach the rubber foot strip to the bottom of leg.
Press firmly into place.
ASSEMBLY FOR (PORTABLE) COMPRESSORS
the motor is running, or continuous leaking after unit reaches
cut-out pressure.
PressureSwitch: Thepressure switchautomatically startsthe
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 “cut-out” pressure.
Safety Valve: If the pressure switch does not shut off the air
compressor at its cut-out pressure setting, the safety valve will
protectagainst highpressure by“popping out”at its factory set
pressure (slightly higher than the pressure switch cut-out
setting).
Outlet Pressure Gauge: The outlet pressure gauge indicates
theair pressure available at theoutlet side of the regulator. This
pressure is controlled by the regulator and is always less or
equal to the tank pressure.
TankPressure Gauge: Thetank pressure gauge indicates the
reserve air pressure in the tank.
Regulator: The air pressure coming from the air tank is con-
trolled by the regulator knob. Turn the knob clockwise to
increasepressure andcounterclockwise to decreasepressure.
Toavoid minorreadjustment aftermaking achange inpressure
setting, always approach the desired pressure from a lower
pressure. When reducing from a higher to a lower setting, first
reduce to some pressure less than that desired, then bring up
to the desired pressure. Depending on the air requirements of
eachparticular accessory, theoutlet regulated airpressure may
have to be adjusted while you are operating the accessory.
Cooling System: This compressor contains an advanced
design cooling system. At the heart of this cooling system is an
engineered fan. It is perfectly normal for this fan to blow air
through the vent holes in large amounts. You know that the
cooling system is working when air is being expelled.
Globe Valve: Turn the knob counter-clockwise to open the
valve and clockwise to close.
DrainValve: Thedrain valve islocated atthe base ofthe air tank
and is used to drain condensation at the end of each use.
MotorThermalOverload Protector: Theelectric motor hasan
automaticthermal overload protector.If the motoroverheats for
any reason, the thermal overload protector will shut off the
motor. The motor must be allowed to cool before restarting.
ON/AUTO - OFF Switch: Turn this switch ON to provide
automatic power to the pressure switch and OFF to remove
power at the end of each use.
Air Intake Filter: This filter is designed to clean air coming into
the pump. This filter must always be clean and ventilation
openings free from obstructions. See "Maintenance".
AirCompressor Pump: To compress air, the piston movesup
and down in the cylinder. On the downstroke, air is drawn in
throughthe air intake valves. Theexhaust valveremains closed.
On the upstroke of the piston, air is compressed. The intake
valves close and compressed air is forced out through the
exhaustvalve, into the outlet tube,through thecheck valve and
into the air tank. Working air is not available until the compres-
sor has raised the air tank pressure above that required at the
air outlet.
CheckValve: When theair compressoris operating,the check
valve is “open”, allowing compressed air to enter the air tank.
Whenthe air compressorreaches“cut-out” pressure,thecheck
valve “closes”, allowing air pressure to remain inside the air
tank.
Pressure Release Valve: The pressure release valve located
on the side of the pressure switch, is designed to automatically
release compressed air from the compressor head and the
outlettube when theair 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 this valvefor a few seconds. No air
should be heard leaking when

7 — ENG
Itmay be necessaryto braceor support oneside of
the outfit when removing the shipping boards be-
cause the air compressor will have a tendency to
tip.
1. Remove all packaging such that only the compressor on
thepallet remains. Remove and discard the (4) screws and
washers that hold the compressor to the pallet.
2. Stationary 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 com-
pressor weight evenly on all four feet. Solid shims may be
used if necessary.
EXCESSIVEVIBRATIONCANWEAKENTHEAIRTANK
AND CAUSE AN EXPLOSION. THE COMPRESSOR
MUST BE PROPERLY MOUNTED AS ILLUSTRATED
BELOW.
Location of the Air Compressor
Locate the air compressor in a clean, dry and well ventilated
area. The air filter must be kept clear of obstructions which
couldreduceair flowtothe air compressor. Theaircompressor
should be located at least 12" away from the wall or other
obstructions that will interfere with the flow of air. The air
compressor head and shroud are designed to allow for proper
cooling. If humidity is high, an air filter can be installed on the
air outlet adapter to remove excessive moisture. Follow the
instructions packaged with the air filter for proper installation.
LubricationandOil
This unit needs no lubrication or oiling.
ExtensionCords
To avoid voltage drop, power loss, and overheating to the
motor, use extra air hose instead of an extension cord. Low
voltage can cause damage to the motor.
If an extension cord must be used:
• do not use with any permanently mounted air compressor.
• use only a 3-wire extension cord that has a 3-blade
grounding plug and a 3-slot receptacle that will accept
the plug on the extension cord.
• make sure the extension cord is in good condition.
• the extension cord should be no longer than 50 feet.
• the minimum wire size is 12 gauge (AWG). (Wire size
increases as gauge number decreases. 10 AWG and
8 AWG may also be used. DO NOT USE 14 AWG or
16 AWG.)
INSTALLATION AND BREAK-IN PROCEDURES
Certainair compressormodelscanbe convertedto
240voltsfrom120voltoperation.Whenconverting
aspecificmodelto 240 volt operation, the attached
three-prong 120 volt plug must be replaced with
thethree-prong 240 voltplug (purchase locally) or
order line cord Part No. K-0084.
Referto Parts List of yourcompressor. Certain air
compressor models can be operated on a 15 amp
circuit if:
1. Voltage supply to circuit is normal.
2. Circuitis not usedtosupply any otherelectri-
cal needs (lights, appliances, etc.).
3. Extension cords comply with specifications
in this manual.
4. Circuit is equipped with a 15 amp circuit
breaker or 15 amp time delay fuse. Use a
Fusetron Type "T" time delay fuse.
Somemodels have adual voltagemotor, 120 and240 volt. They
arewired for 120volt but canbe converted to240volt operation.
Instructions for converting these motors for operation at 240
voltcan be found printed on the labelattached tothe side of the
motor.
If any of the above conditions cannot be met, or if operation of
the compressor repeatedly causes interruption of the power, it
may be necessary to operate it from a 20 amp circuit. It is not
necessary to change the cord set.
Removal of Shipping Boards and Installation for
(Stationary) Units

8 — ENG
Additional Regulators and Controls
Since the air tank pressure is usually greater than that which is
needed,a separateregulator isusually employedto controlthe
air pressure ahead of any individual air driven device.
Break-inProcedures
Seriousdamagemay result if the followingbreak-
in instructions are not closely followed.
This procedure is required:
1. Before the air compressor is put into service. (Before the
hose is installed.)
2. When the check valve is replaced.
3. When a complete compressor pump is replaced.
a. Set the pressure switch lever to the "OFF" position.
b. Plug the power cord into the correct branch circuit
receptacle.
c. Turn the regulator clockwise opening it fully, to
prevent air pressure build-up in the tank.
d. Move the pressure switch lever to "ON/AUTO". The
compressor will start.
e. Run the compressor for 15 minutes. Make sure the
regulator is open and there is no tank pressure build-
up.
f. After 15 minutes, close the regulator by turning it
counterclockwise. The air receiver will fill to cut-out
pressure and the motor will stop. The compressor is
now ready for use.
IMPROPER GROUNDING CAN RESULT IN ELEC-
TRICALSHOCK.
Do not modify the plug that has been provided. If it does not fit
the available outlet, the correct outlet should be installed by a
qualified electrician.
If repairing or replacing cord or plug, the grounding wire must
be kept separate from the current-carrying wires. Never con-
nect the grounding wire to a flat blade plug terminal. The
grounding wire has insulation with an outer surface that is
green - with or without yellow stripes.
Ifthese groundinginstructions are not completely understood,
orifindoubt as to whetherthecompressorisproperly grounded,
have the installation checked by a qualified electrician.
GROUNDING INSTRUCTION — (Portable Units)
RISK OF ELECTRICAL SHOCK! In the event of a
shortcircuit,groundingreducestheriskofshockby
providing an escape wire for the electric current.
This air compressor must be properly grounded.
Theair compressoris equippedwith acord having a grounding
wire with an appropriate grounding plug. The plug must be
used with an outlet that has been installed and grounded in
accordance with all local codes and ordinances. The outlet
must have the same configuration as the plug. See illustration.
DO NOT USE AN ADAPTER.
Inspect the plug and cord before each use. Do not use if there
are signs of damage.
Voltage and Circuit Protection
Referto the specificationchart forvoltage and circuitprotection
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.
Plastic or PVC pipe is not designed for use with
compressedair. Regardless ofits indicated pres-
sure rating, plastic pipe can burst from air pres-
sure. Use only metal pipe for air distribution lines.
If a pipe line is necessary, use pipe that is the same size as the
air tank outlet. Piping that is too small will restrict the flow of
air. If piping is over 100 feet long, use the next larger size. Bury
underground 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 of leaks.
Itis recommended that a flexiblecoupling beinstalled between
the air discharge valve outlet and main air distribution line to
allow for vibration.
Piping
INSTALLATION AND BREAK-IN PROCEDURES (cont'd)

9 — ENG
INSTALLATION AND BREAK-IN PROCEDURES (cont'd)
RISK OF ELECTRICAL SHOCK. IMPROPER
ELECTRICAL GROUNDING CAN RESULT IN
ELECTRICAL SHOCK. WIRING FOR THIS UNIT
SHOULD BE DONE BY A LICENSED ELECTRI-
CIAN IN ACCORDANCE WITH NATIONAL AND
LOCAL CODES AND ORDINANCES.
This unit was not designed to operate on 208
volts.
Install the compressor as close to the main power supply as
possible. Thispractice willavoid using longlengths ofelectrical
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 in the Parts List Manual
for your compressor.
2. The supply line has the same electrical characteristics
(voltage, cycle, phase) as the motor.
This product should be connected to a grounded, metallic,
permanent wiring system, or an equipment-grounding termi-
nal or lead on the product.
Grounding Instructions - Stationary
(permanently mounted) compressors
Electrical wiring must be located away from hot
surfacessuch asmanifold assembly,compressor
outlet tubes, heads, or cylinders.
Wiring Instructions - Stationary
(PermanentlyMounted)Compressors
If your compressor is not equipped with a plug-in type power
cord, perform electrical wiring according to the following in-
structions:
Wiring must be such that full motor nameplate voltage plus or
minus 10% is available at the motor terminals during starting.
Refertolocal codes forrecommendedwire sizes forcorrect wire
size and maximum wire run; undersize wire causes high amp
draw and overheating to the motor.
OPERATING PROCEDURES
DailyStart-UpChecklist
1. Before attaching air hose or accessories, make sure the
ON/AUTO lever is set to “OFF” and the air regulator or
globe valve is closed.
2. Attach hose and accessories.
TOO MUCH AIR PRESSURE CAUSES A HAZARD-
OUSRISK OF BURSTING. CHECKTHEMANUFAC-
TURER'SMAXIMUM PRESSURE RATINGFOR AIR
TOOLS AND ACCESSORIES. THE REGULATOR
OUTLET PRESSURE MUST NEVER EXCEED THE
MAXIMUMPRESSURERATING.
Compressed air from the outfit may contain
water condensation. Do not spray unfiltered air
at an item that could be damaged. Some air
operated tools or devices may require filtered
air. Read the instructions for the air tool or
device.
3. Check the manufacturer’s maximum pressure rating for
air tools and accessories.The regulator outlet pressure
must never exceed the maximum pressure rating. If your
compressor is not supplied with a regulator with gauge,
install one before using accessories.
4. Turn the ON/AUTO lever to “AUTO” and allow tank
pressure to build. Motor will stop when tank pressure
reaches “cut-out” pressure.
WATER WILL CONDENSE IN THE AIR TANK. IF NOT
DRAINED,WATERWILLCORRODEANDWEAKEN THE
AIR TANK CAUSING A RISK OF AIR TANK RUPTURE.
12. After thewater has beendrained, closethe drain valve. The
air compressor can now be stored.
NOTE
If drain valve is plugged, release all air pressure.
The valve can then be removed, cleaned, then
reinstalled.
5. Open the regulator by turning it clockwise. Adjust the
regulator to the correct pressure setting. Your
compressor is ready for use.
6. Always operate the air compressor in well-ventilated
areas; free of gasoline or other solvent vapors. Do not
operate the compressor near the spray area.
When you are finished:
7. Set the “ON/AUTO” lever to “OFF”.
8. Turn the regulator counterclockwise and set the outlet
pressure to zero.
9. Remove the air tool or accessory.
10. Open the regulator and allow the air to slowly bleed from
the tank. Close the regulator when tank pressure is
approximately 20 psi.
11. Drain water from air tank by opening drain valve on
bottom of tank.

10 — ENG
Air Filter - Inspection and Replacement
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. Beforeyou usethe compressor, check the air filter to
be sure it is clean.
If it is dirty, simply pull it out. You may wash it with a mild
detergent and warm water, or replace it.
SafetyValve - Inspection
IFTHESAFETYVALVEDOESNOTWORKPROP-
ERLY, OVER-PRESSURIZATION MAY OCCUR,
CAUSING AIR TANK RUPTURE OR AN EXPLO-
SION. DAILY 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 THE SAME TYPE
OF VALVE.
Motor
The motor has an automatic reset thermal overload protector.
Ifthe motor overheatsfor any reason,the overloadprotector will
shut off the motor. The motor must be allowed to cool down
before restarting. The compressor will automatically restart
after the motor cools.
If the overload protector shuts the motor off frequently, check
for a possible voltage problem. Low voltage can also be
suspectedwhen:
1. The motor does not get up to full power or speed.
2. Fuses blow out when starting the motor; lights dim and
remain dim when motor is started and/or is running.
SERVICE INSTRUCTIONS
Filter
Hot surfaces. Risk of burn. Compressor heads
areexposed when filtercover isremoved. Allow
compressor to cool prior to servicing. UnitsWithExternalBrassCheckValveReplacement
1. Releaseall air pressurefrom air tankand disconnect power
from outfit.
2. Remove shroud.
3. Loosen the top and bottom nuts and remove the outlet
tube.
4. Remove the pressure release tube and fitting.
5. Unscrew the check valve (turn counterclockwise) using a
socketwrench.
6. Check that the valve disc moves freely inside the check
valveand that thespring holdsthe disc inthe upper, closed
position. The check valve may be cleaned with a strong
solvent.
7. Apply sealant to the check valve threads. Reinstall the
check valve (turn clockwise).
8. Replace the pressure release tube and fitting.
9. Replace the outlet tube and tighten top and bottom nuts.
10. Replace the shroud.
UNIT CYCLES AUTOMATICALLY WHEN POWER IS ON. WHEN DOING MAINTENANCE, YOU MAY BE EXPOSED TO
VOLTAGESOURCES, COMPRESSED AIR OR MOVINGPARTS. PERSONALINJURIESCANOCCUR. BEFOREPERFORM-
INGANYMAINTENANCEORREPAIR, DISCONNECT POWER SOURCE FROMTHECOMPRESSORANDBLEEDOFF ALL
AIRPRESSURE.
Daily:
1. Drain water from the air tank, any moisture separators
or transformers.
2. Check for any unusual noise and/or vibration.
3. Manually check safety valve to make sure of proper opera-
tion.
4. Inspect air filter, replace if necessary.
5. Inspect air lines and fittings for leaks; correct as
necessary.
Each Year of Operation or if a Problem is Suspected:
Check condition of air compressor pump intake and exhaust
valves. Replace if damaged or worn out.
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.
MAINTENANCE
ALL MAINTENANCE AND REPAIR OPERATIONS NOT LISTED MUST BE DONE BY
QUALIFIED SERVICE PERSONNEL.
ROUTINE MAINTENANCE SCHEDULE

11 — ENG
2. Protectthe electricalcord andair hosefrom damage(such
as being stepped on or run over). Wind them loosely
around the compressor handle.
3. Store the air compressor in a clean and dry location.
Before you store the air compressor, make sure you do the
following:
1. Review the “Maintenance” and "Operating Procedures"
sections and perform maintenance as necessary. Be
sure to drain water from the air tank.
STORAGE

12 — ENG
PROBLEM CAUSE
Move the pressure switch lever to the “OFF” posi-
tion. If the outfit doesn’t shut off, unplug. If the
electricalcontacts are welded together, replace the
pressure switch.
Contact an authorized service center to check and
replace pressure switch.
Tighten fittings where air can be heard escaping.
Check fittings with soapy water solution. DO NOT
OVER-TIGHTEN.
Adefective check valve results ina constant air leak
atthe pressure release valve when there ispressure
inthe tank andthe compressor isshut off. Drain tank
then remove and clean or replace check valve. DO
NOT OVER-TIGHTEN.
Remove and replace the release valve.
Adefective check valve results ina constant air leak
atthe pressure release valve when there ispressure
inthe tank andthe compressor isshut off. Drain tank
then remove and clean or replace check valve. DO
NOT OVER-TIGHTEN.
Torque head screws to 8 ft. lbs. If this does not stop
leak, replace o-ring.
If there is an excessive amount of pressure drop
when the accessory is used, adjust the regulator
following the instructions on page 6.
NOTE:
Adjust the regulated pressure under flow
conditions (while accessory is being used).
Operate safety valve manually by pulling on ring. If
valve still leaks, it should be replaced.
Remove and clean, or replace.
Decrease amount of air usage.
Check the accessory air requirement. If it is higher
than the SCFM or pressure supplied by your air
compressor, you need a larger compressor.
Clean or replace air intake filter. Do not operate the
air compressor with the filter removed. See page 8.
Check and replace if required.
Remove and clean, or replace.
Tighten fittings. (See Air Leaks Section of Trou-
bleshooting Guide.)
PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR SOURCES. PER-
SONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, DISCONNECT POWER SOURCE FROM THE
COMPRESSOR AND BLEED OFF TANK AIR PRESSURE.
CORRECTION
Pressure switch does not shut off
motor when compressor reaches
“cut-out” pressure.
Pressure switch “cut-out” too high.
Tube fittings are not tight enough.
Defective or dirty check valve.
Defectivepressureswitchreleasevalve.
Defectivecheck valve.
Defective air tank.
Leaking o-ring.
Itis normalfor “some”pressure drop to
occur.
Possible defect in safety valve.
Defectivecheck valve.
Prolonged excessive use of air.
Compressor is not large enough for air
requirement.
Restricted air intake filter.
Hole in hose.
Check valve restricted.
Air leaks.
Excessive tank pressure - safety
valve pops off.
Air leaks at fittings.
Air leaks at or inside check valve.
Air leaks at pressure switch
releasevalve.
Air leaks in air tank or at air tank
welds.
Air leaks between head and valve
plate.
Pressurereadingon theregulated
pressure gauge drops when an
accessory is used.
Air leak from safety valve.
Knocking Noise.
Compressor is not supplying
enough air to operate accesso-
ries.
DO NOT DRILL INTO, WELD OR OTHERWISE
MODIFY AIR TANK OR IT WILL WEAKEN. THE
TANK CAN RUPTURE OR EXPLODE. TANK
MUST BE REPLACED.
TROUBLESHOOTING GUIDE

13 — ENG
PROBLEM CAUSE CORRECTION
Motor overload protection switch has
tripped.
Tankpressureexceedspressureswitch
“cut-in” pressure.
Wrong gauge wire or length of exten-
sion cord.
Check valve stuck open.
Loose electrical connections.
Possible defective motor or capacitor.
Paint spray on internal motor parts.
Fuse blown, circuit breaker tripped.
Pressure release valve on pressure
switch has not unloaded head pres-
sure.
Damagedregulator.
Let motor cool off and overload switch will automati-
cally reset.
Motor will start automatically when tank pressure
drops below “cut-in” pressure of pressure switch.
Check for proper gauge wire and cord length.
Remove and clean, or replace.
Check wiring connection inside pressure switch and
terminal box area.
Contact an Authorized Warranty Service Center for
inspection or replacement, if necessary.
Have checked by an Authorized Warranty Service
Center. Do not operate the compressor in the paint
spray area. See flammable vapor warning.
1. Check fuse box for blown fuse and replace, if
necessary. Reset circuit breaker. Do not use a
fuseor circuitbreaker with higherrating thanthat
specified for your particular branch circuit.
2. Check for proper fuse; only “Fusetron” type T
fusesare acceptable.
3. Check for low voltage conditions and/or proper
extension cord.
4. Disconnect the other electrical appliances from
circuit or operate the compressor on its own
branch circuit.
Bleed the line by pushing the lever on the pressure
switchto the“off” position; if the valve does notopen,
replaceit.
Replaceregulator.
Motor will not run or restart.
Regulator knob has continuous
air leak. Regulator will not shut
off air outlet.

14 — ENG
SERVICE NOTES
NOTAS DE SERVICIO
NOTES SUR LE SERVICE

15 — ENG
SERVICE NOTES
NOTAS DE SERVICIO
NOTES SUR LE SERVICE

DeVilbiss Air Power Company • 213 Industrial Drive • Jackson, TN 38301-9615
GENERAL MANUAL FOR
PERMANENTLY LUBRICATED
TWIN CYLINDER AIR COMPRESSORS
SERVICE NOTES