Campbell Hausfeld HU3501, IN630800AV User Manual

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See Warranty on page 8 for important information about commercial use of this product.

Operating Instructions




Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described. Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or property damage! Retain instructions for future reference.

Oilless Compressors


Portable oilless air compressors are for home and workshop use. Cleaning or replacement of the inlet filter on all models and draining moisture from the air receivers are required maintenance.

Safety Guidelines

This manual contains information that is very important to know and understand. This information is provided for SAFETY and to PREVENT EQUIPMENT PROBLEMS. To help recognize this information, observe the following symbols.

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 or serious injury.

caution indicates a potentially hazardous situation which, if not avoided, MAY result in minor or moderate injury.

Notice indicates important

information, that if not followed, may cause damage to equipment.


When unpacking unit, inspect carefully for any damage that may have occurred during transit. Make sure any loose fittings, bolts, etc., are tightened before putting unit into service. In case of questions, damaged or missing parts, please call 1-800-543-6400 for customer assistance. Have the serial number, model number, and parts list (with missing parts circled) before calling.

Do not return

STOP! the product to the retailer!

Record the Model No., Serial No. and date of purchase located on the base below the pump in the space below.

Model No.


Serial No.


Date of purchase _________________

Retain these numbers for future reference.

General Safety


This product or

its power cord may contain chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.

You can create

dust when you cut, sand, drill or grind materials such

as wood, paint, metal, concrete, cement, or other

masonry. This dust often contains chemicals known to cause cancer, birth defects, or other reproductive harm. Wear protective gear.

Breathable Air Warning

This compressor/pump is not equipped and should not be used “as is” to supply breathing quality air. For any application of air for human consumption, the air compressor/pump will need to be fitted with suitable in-line safety and alarm equipment. This additional equipment is necessary to properly filter

and purify the air to meet minimal specifications for Grade D breathing as described in Compressed Gas Association Commodity Specification G 7.1

- 1966, OSHA 29 CFR 1910. 134, and/or Canadian Standards Associations (CSA).

DISCLAIMER OF WARRANTIES In the event the compressor is

used for the purpose of breathing air application and proper in-line safety and alarm equipment is not simultaneously used, existing warranties shall be voided, and Campbell Hausfeld disclaims any liability whatsoever for any loss, personal injury or damage.


Air compressors are utilized in a variety of air system applications. Because air compressors and other components (material pump, spray gun, filters, lubrications, hoses, etc.) used make up a high pressure pumping system, the following safety precautions should be observed at all times. Only persons well acquainted with these rules of safe operation should be allowed to use the air compressor.

All electrical work should be done by a

qualified (licensed or certified) electrician. On a properly wired circuit, the black wires supply a voltage potential even when the unit is off.

REMINDER: Keep your dated proof of purchase for warranty purposes! Attach it to this manual or file it for safekeeping.

© 2009 Campbell Hausfeld/Scott Fetzer

For parts, product & service information

IN630800AV 5/09


Portable Air Compressors

General Safety (Cont.)

1.Read instruction manuals for each component carefully, before attempting to assemble, disassemble or operate your particular system.

2.Wear safety glasses and use hearing protection

when operating the pump or unit.

3.Do not stand on or use the pump or unit as a handhold.

4.Do not exceed pressure rating of any component in system.

5.Protect material lines and air lines from damage or puncture. Keep hose and power cable away from sharp objects, chemical spills, oil, solvents, and wet floors.

6.Never point a spray gun at oneself or any other person. Accidental discharge may result in serious injury.

7.Check hoses for weak or worn condition, before each use, making certain all connections are secure; do not use if deficiency is found. Notify an authorized service facility for examination or repair.

Do not run unattended. Leaving

compressor in ON position may allow it to turn on inadvertently. To prevent this and possible damage from power surge, turn to OFF position after each use.

8.Release all pressures within system slowly; dust and debris may be harmful.


fingers away from a running

compressor; fast moving and hot parts will cause injury and/or burns.

Disconnect power and depressurize

system before servicing air compressor!

9.Follow all local electrical and safety codes, as well as the National Electrical Code (NEC) and the Occupational Safety and Health Act (OSHA).

10.Wiring and fuses should follow electrical codes, current capacity, and be properly grounded.

11.Electric motors must be securely and adequately grounded. See grounding instructions and extension cord information, in this manual.

12.Always disconnect power source before working on or near a motor, or its connected load. If power disconnect point is out-of-sight, lock it in the open position and tag to prevent unexpected application of power.

13.Guard all moving parts; keep visitors away. Never allow children in work area.

14.Use only a properly grounded outlet that will accept a three pronged plug, and wear shoes to prevent shock hazards.


careful when touching exterior of operating motor; it may be hot enough to cause injury.

Compressor parts may be hot even if the unit is stopped.

15.Protect power cable from coming in contact with sharp objects.

16.Clean electrical or electronic equipment with an approved cleaning agent, such as dry, nonflammable cleaning solvent.


electrical equipment and controls can cause electrical arcs that

will ignite a flammable gas

or vapor. Never operate or repair the unit near a flammable gas or vapor. Never store flammable liquids or gases in the vicinity of the compressor.

17. To reduce fire hazard, keep engine/motor exterior free of oil, solvent, or grease.

18.To avoid spontaneous combustion, discard waste rags into approved metal waste cans.

19.NEVER reset safety valve or pressure switch. Keep safety valve free from paint and other accumulations. This provides safety against over pressure.

Never remove or attempt to adjust

safety valve. Keep safety valve free from paint and other accumulations.

20.Do regular maintenance; keep all nuts, bolts, and screws tight, to be sure equipment is in safe working condition .

21.Keep cleaning rags and other flammable waste materials in a tightly closed metal container and dispose of later in the proper fashion.

22.Drain tanks of moisture after each day’s use. If unit will not be used for a while, it is best to leave drain cock

open until such time as it is to be used. This will allow moisture to completely drain out and help prevent corrosion of inside of tank.

23.Inspect tank yearly for rust, pin holes or any other imperfections that could cause it to become unsafe. NEVER weld or drill holes in air tank.

Never attempt

to repair or modify a tank! Welding, drilling or any other modification will weaken the tank resulting in damage from rupture or explosion. Always replace worn or damaged tanks.

Drain liquid from tank daily.

Spraying Precautions

Do not spray flammable materials

in vicinity of open flame or near ignition sources including the compressor unit.

24.Spray in a well ventilated area, to keep fumes from collecting and causing health and fire hazards.

25.Do not spray in vicinity of open flames or other places where a spark can cause ignition. Do not smoke when spraying paint, insecticides, or other flammable substances.

26.Use a respirator when spraying.

27.Do not direct paint or other sprayed material at the compressor. Locate compressor as far away from

the spraying area as possible to minimize overspray accumulation on the compressor.

28.When spraying or cleaning with solvents or toxic chemicals, follow the instructions provided by the chemical manufacturer.

29.Do not smoke when spraying paint, insecticides, or other flammable substances.

30.Use a face mask/ respirator when

spraying and spray in a well ventilated area to

prevent health and fire hazards.

31.Household use only.

32.To reduce the risk of electrical shock, do not expose to rain. Store indoors.




Assembly Tools Required

Tools (not provided) for assembly:

-2 14mm wrench or socket wrench

-2 17mm wrench or socket wrench

Foot Assembly (Figure 1)

Foot assembly kit includes:

-1 rubber foot

-1 bolt

-2 washers

-1 nut



Rubber Foot





Figure 1 - Rubber foot installation

Wheel Assembly (Figure 2)

Wheel assembly kit includes:

-2 wheels*

-2 axle bolts*

-2 lock washers*

-2 nuts*

The items marked with an asterisk (*) were shipped loose with the unit.





Axle Bolt

Figure 2 - Wheel assembly

1.Wheel has an offset hub. With offset hub facing axle iron, assemble axle bolt through holes in wheel and axle iron.

2.Place lock washer on axle bolt. Then tighten nut securely to threaded part of axle bolt.

3.Repeat procedure with other side.

Handle Assembly (Figure 3)


Wire and Terminal Guide






Power cord




Motor cord




Power cord




Motor cord




( ) When the unit is not in operation




Figure 3 - Handle Assembly

Handle assembly kit includes:

-1 handle

-2 bolts

1.Insert ends of handle into tube shaped brackets on tank.

2.Align screw holes.

3.Thread screw into hole until tight.



It is extremely important to install the compressor in a clean, well ventilated area where the surrounding air temperature will not be more than 100°F.

A minimum clearance of 18 inches between the compressor and a wall is required because objects could obstruct air flow.

Do not locate the

compressor air inlet near steam, paint spray, sandblast areas or any other source of contamination. This debris will damage the motor

Household use only. Store indoors.

Electrical installation

1.Check and tighten all bolts, fittings, etc., before operating compressor.

2.Operate compressor in a ventilated area so that compressor may be properly cooled.

3.Compressor should be located where it can be directly plugged into an outlet, but if this is not possible, an extension cord may be used. It should be selected using the extension cord chart on page 3 as a guide.

4.To avoid loss of power and overheating, it is better to use additional air hose instead of extension cords to reach work area.


1.Local electrical wiring codes differ from area to area. Source wiring, plug and protector must be rated for at least the amperage and voltage indicated on motor nameplate, and meet all electrical codes for this minimum .

2.Use a slow blow fuse type T or a circuit breaker.

Overheating, short circuiting and fire

damage will result from inadequate wiring, etc.

All wiring and electrical

connections should be performed by a qualified electrician. Installation must be in accordance with local codes and national electrical codes.

NOTE: 120 volt, compressor can be operated on a 120 volt, 15 amp circuit under the following conditions:

a.No other electrical appliances or lights are connected to the same branch circuit.

b.Voltage supply is normal.

c.Extension cords are of the minimum gauge specified in this instruction manual.

d.Circuit is equipped with a 15 amp circuit breaker or a 15 amp slow blow fuse type T.

3.If above conditions cannot be met or if nuisance tripping of current protection device occurs, it may be necessary to operate compressor from a 120 volt, 20 amp circuit.



Never use the








Extension cords for 120V/10 Amp Unit





handle to lift the





Length of Cord (ft)





unit completely off the ground. Only


use the handle to lift one end so the

Gauge of Cord





wheels may be used to move the unit.




Portable Air Compressors

Installation (Cont.)

Grounding instructions

This product must be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current. This product is equipped with a cord having a grounding wire with an appropriate grounding plug. The plug must be

plugged into an outlet that is properly installed and grounded in accordance with all local codes and ordinances.










Figure 4 - Grounding Method

improper installation of the grounding

plug is able to result in a risk of electric shock. When repair or replacement of the cord or plug is required, do not connect the grounding wire to either flat blade terminal. The wire with insulation having an outer surface that is green with or without yellow stripes is the grounding wire.

Do not use adapter with this product!

Never connect

green (or green and yellow) wire to a live terminal.

Check with a qualified electrician or serviceman when the grounding instructions are not completely understood, or when in doubt as to whether the product is properly grounded. Do not modify the plug

provided; if it does not fit the outlet, have the proper outlet installed by a qualified technician.

This product is for use on a nominal 120V circuit and has a grounding plug similar to the plug illustrated in Figure 4. Only connect the product to an outlet having the same configuration as the plug. Do not use an adapter with this product.

Extension cords

To avoid loss of power and

overheating, it is better to use additional air hose instead of extension cords to reach work area.

Moisture in compressed air

Moisture in compressed air will form into droplets as it comes from an air compressor pump. When humidity is high or when a compressor is in continuous use for an extended period of time, this moisture will collect in the tank. When using a paint spray or sandblast gun, this water will be carried from the tank through the hose, and out of the gun as droplets mixed with the spray material.

Important: This condensation will cause water spots in a paint job, especially when spraying other than water based paints. If sandblasting, it will cause the sand to cake and clog the gun, rendering it ineffective. A filter in the air line, located as near to the gun as possible, will help eliminate this moisture.

Use only a 3-wire extension cord that has a 3-blade grounding plug, and

a 3-slot receptacle that accepts the plug on the product. Make sure your extension cord is not damaged. When using an extension cord, be sure to use one heavy enough to carry the current your product draws. An undersized cord results in a drop in line voltage and loss of power and overheating. [The table on page 3 shows the correct size to use depending on cord length and nameplate ampere rating. When in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.]


Pressure Switch - ON/Off Switch (Figure 5) - In the ON position, the compressor shuts off automatically when tank pressure reaches the maximum preset pressure. In the Off position, the compressor will not operate. This switch should be in the Off position when connecting or disconnecting the power cord from the electrical outlet or when changing air tools.



Regulator Knob


Figure 5 - ON/OFF Switch

Regulator - The regulator controls the amount of air pressure released at the hose outlet.

ASME Safety Valve - This valve automatically releases air if the tank pressure exceeds the preset maximum.

Exhaust Tube - This tube carries compressed air from the pump to the check valve. This tube becomes very hot during use. To avoid the risk of severe burns, never touch the exhaust tube.

Check Valve - A one-way valve that allows air to enter the tank, but prevents air in the tank from flowing back into the compressor pump.

Handle - Designed to move the compressor.

Drain Valve - This valve is located on the side of the tank. Use this valve to drain moisture from the tank daily to reduce the risk of corrosion.

Drain liquid from tank daily.

Reduce tank pressure below 10 psi, then drain moisture from tank daily to avoid tank corrosion. Drain moisture from tank by opening the drain valve located underneath or on the side of the tank.

Before first start-up Break-in procedure

(Complete this procedure before using compressor for the first time. Once completed, it is not necessary to repeat.)

1.Turn regulator knob fully clockwise (to the right) to open air flow and open drain valve.

2.Turn On/Off switch to OFF position.

3.Plug in power cord.

4.Turn On/Off switch to ON position and run compressor for 30 minutes.



Operation (Cont.)

5.Turn On/Off switch to OFF position.

6.Unplug power cord.

7.Close drain valve.

The compressor is now ready for use.

Before each start-up operating procedure

1.Turn regulator knob fully counter clockwise (to the left) to close air flow.

2.Connect air hose to outlet of regulator.

3.Turn On/Off Switch to OFF position.

4.Plug in power cord.

5.Turn On/Off Switch to ON position and let compressor run until it reaches automatic shutoff pressure.

6.Attach tire chuck or tool to end of hose.

7.Turn regulator knob clockwise (to the right) to desired pressure of tool being used.

On/Off cycling of compressor

In the ON position, the compressor pumps air into the tank. When a shut-off (preset “cut-out”) pressure is reached, the compressor automatically shuts off.

If the compressor is left in the ON position and air is depleted from the tank by use of a tire chuck, tool, etc., the compressor will restart automatically at its preset “cut-in” pressure. When a tool is being used

continuously, the compressor will cycle on and off automatically.

In the OFF position, the pressure switch cannot function and the compressor will not operate. Make sure switch

is in OFF position when connecting or disconnecting power cord from electrical outlet.

ASME Safety Valve

Do not remove or attempt to adjust

the safety valve!

Check the safety valve by performing the following steps:

1.Plug the compressor in and run until shut off pressure is reached (see Operating Procedure).

2.Wearing safety glasses, pull the ring on the safety valve (see Figure 6) to release pressure from compressor

tank. Use your other hand to deflect fast-moving air from being directed toward your face.

Figure 6

3.The safety valve should automatically close when pressure in the tank has been released. If the safety valve does not allow air to be released when you pull on the ring, or if it does not close automatically, it MUST be replaced.

Safety valve must be replaced if it

cannot be actuated or it leaks air after ring is released.

pressure gaugeS

Gauge attached to regulator indicates air pressure going to hose (and any tool attached to end of hose).

Gauge attached to pressure switch indicates air pressure in tank.


Release all pressure and disconnect

power before making any repair.

1.Check compressor for any visible problems, especially check air filter to be sure it is clean.

2.Pull ring on safety valve and allow it to snap back to normal position (Figure 6).

Safety valve must be replaced if it

cannot be actuated or it leaks air after ring is released.

3.Daily with compressor shut off: Depressurize system prior to draining tank. Drain moisture from tanks by opening drain cocks on the side or underneath end of tank.

NOTE: Drain cup should be emptied regularly.

Figure 7

Do not remove drain plug with tank under pressure.

4.Turn power OFF and clean dust and dirt from motor, tank, air lines and pump cooling fins.

NOTE: The air filter in the filter housing on the side of the head must be checked and cleaned periodically, more often if used under very dusty conditions or when a great deal of fog from spraying is allowed to circulate near unit.

Important: Unit should be located as far from spraying area as hose will allow to prevent over-spray from clogging filter.

Drain Cup valve operation

1.To open, slowly turn drain knob counter-clockwise 2 to 4 turns until water or air begins to escape into the cup.

NOTE: Do not turn or force the knob more than 2 to 4 turns, taking care not to remove the knob.

2.To prevent overflow, monitor the cup at all times when draining.

3.When the cup is partially full or draining is complete (whichever happens first), shut off drain by turning knob clockwise.

4.Empty the cup, disposing of the water properly.

5.If water remains in tank, continue draining until the unit is empty.

Turn counterclockwise to


Turn clockwise to close

Figure 8 - Drain cup valve

Filter removal, inspection and replacement

To change a filter, pull off the filter housing cover. If filter element is dirty, rotate filter cover so the holes line up with clean element material and snap cover onto housing. If filter element has no clean areas, replace element or entire filter.


Portable Air Compressors


This is an oilless type compressor requiring no lubrication.

Thermal overload protector

Turn off the pressure switch or unplug compressor for 20 minutes and allow it to cool. Reset the unit. Switch unit to OFF and turn ON again to resume work.

This compressor is equipped with a

manual reset thermal overload protector which will shut off motor if it becomes overheated.

If thermal overload protector shuts motor off frequently look for the following causes.

1.Low voltage.

2.Wrong gauge wire or length of extension cord.

3.Clogged air filter.

4.Lack of proper ventilation.

The motor must be allowed to cool down before start-up is possible. The motor will automatically restart without warning if left plugged into electrical outlet, if the motor is turned on.


1.When not in use, hose and compressor should be stored in a cool dry place.

2.Tank should be drained of moisture.

3.Hose should be disconnected and hung open ends down to allow any moisture to drain.



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