CRAFTSMAN 921.166420 Air Compressor Direct Drive Owner’s Manual

CRAFTSMAN 921.166420 Air Compressor Direct Drive

CAUTION:
Before using this product, read this manual and follow all its Safety Rules and Operating Instructions.

WARRANTY

ONE YEAR FULL WARRANTY ON CRAFTSMAN AIR COMPRESSOR

If this Craftsman Air Compressor fails due to manufacturer’s defects in material or workmanship within one year of the date of purchase, RETURN IT TO THE NEAREST SEARS STORE OR SERVICE CENTER IN THE UNITED STATES and it will be replaced or repaired (at our option), free of charge.
If this Air Compressor is used for commercial or rental purposes, this warranty applies for only 90 days from the date of purchase. This warranty gives you specific legal rights and you may also have other rights which vary from state to state.

Sears, Roebuck and Co., Hoffman Estates, IL 60179

Safety Symbols

The information listed below should be read and understood by the operator. This information is given to protect the user while operating and storing the air compressor. We utilize the symbols below to allow the reader to recognize important information about their safety.

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

When used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

Important Safety Instructions and Guidelines

Save all instructions

Improper operation or maintenance of this product could result in serious injury and/or property damage. Read and understand all of the warnings and safety instructions provided before using this equipment.

| The air compressor should be operated on a dedicated 15 amp circuit. If the circuit does not have 15 free amps available, a larger circuit must be used. Always use more air hose before utilizing extension cords. All extension cords used must be 12 gauge with a maximum length of 25 ft. The circuit fuse type must be a time delay. Low voltage could cause damage to the motor.
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Risk of Moving Parts

| If the air compressor is in operation, all guards and covers should be attached or installed correctly. If any guard or cover has been damaged, do not operate the equipment until the proper personnel has correctly repaired the equipment. The power cord should be free of any moving parts, twisting and/or crimping while in use and while in storage.

Risk of Burns

| There are surfaces on your air compressor that while in operation and thereafter can cause serious burns if touched. The equipment should be allowed time to cool before any maintenance is attempted. Items such as the compressor pump and the outlet tube are normally hot during and after operation.

Risk of Falling

| Operation of the air compressor should always be in a position that is stable. Never use the air compressor on a rooftop or elevated position that could allow the unit to fall or be tipped over. Use additional air hose for elevated jobs.

Risk from Flying Objects

| Always wear ANSI Z87.1 approved safety glasses with side shields when the air compressor is in use. Turn off the air compressor and drain the air tank before performing any type of maintenance or disassembly of the hoses or fittings. Never point any nozzle or sprayer toward any part of the body or at other people or animals.

Risk of Breathing

| Avoid using the air compressor in  confined  areas.  Always  have  adequate space (12 inches) on all sides of the air compressor. Also keep children, pets, and others out of the area of operation. This air compressor does not provide breathable air for anyone or any auxiliary breathing device. Spraying material will always need to be in another area away from the air compressor to not allow intake air to damage the air compressor filter.

Risk of Electrical Shock

| Never utilize the air compressor in the rain or wet conditions. Any electrical issues or repairs should be performed by authorized personnel such as an electrician and should comply with all national and local electrical codes. The air compressor should also have the proper three prong grounding plug, correct voltage, and adequate fuse protection.

Risk of Explosion or Fire

| Never operate the compressor near combustible materials, gasoline or solvent vapors. If spraying flammable materials, locate the air compressor at least 20 feet away from the spray area. Never operate the air compressor indoors or in a confined area.

Risk of Bursting

| Always drain the air compressor tank daily or after each use. If the tank develops a leak, then replace the air compressor. Never use the air compressor after a leak has been found or try to make any modifications to the tank. Never modify the air compressor’s factory settings which control the tank pressure or any other function.

Specifications

Pump ……………………. Oil-Free Direct Drive
Motor ……………………………… 1.5 HP
Bore ……………………………….. 2.28″
Stroke ………………………………. 0.87″
Voltage Single Phase …………………. 120 VAC
Minimum Circuit Requirement ………….. 15.0 Amps
Air Tank Capacity …………………… 20 Gallons
Cut-in Pressure ……………………… 120 PSI
Cut-out Pressure …………………….. 150 PSI
SCFM @ 90 PSI …………………………. 3.8
SCFM @ 40 PSI …………………………. 5.1

Glossary

CFM: Cubic feet per minute.
SCFM: Standard cubic feet per minute; a unit of measure for air delivery.
PSIG: Pounds per square inch gauge; a unit of measure for pressure.
ASME: American Society of Mechanical Engineers.
California Code: Unit may comply with California Code 462 (I) (2)/(M) (2).
Cut-In Pressure: The air compressor will automatically start to refill the tank when the pressure drops below the prescribed minimum.
Cut-Out Pressure: The point at which the motor stops when the tank has reached maximum air pressure.
Code Certification: Products that bear one or more of the following marks: UL, ULc, ETL, CSA, have been evaluated by OSHA-certified independent safety laboratories and meet the applicable Underwriters Laboratories Standards for Safety.

Duty Cycle

This is a 50% duty cycle air compressor. Do not run the air compressor more than 30 minutes of one hour. Doing so could damage the air compressor.

Parts & Features

See figures below for reference

Installation & Assembly

The air compressor should be turned off, unplugged from the power source, the air bled from the tank and the unit allowed time to cool before any maintenance is performed. Personal injuries could occur from moving parts, electrical sources, compressed air or hot surfaces. The quick connect assembly must be attached before use. Failure to assemble correctly could result in leaks and possible injury. If unsure of assembly instructions or you experience difficulty in the assembly please call your local service department for further information.

Getting Started – Location of the Air Compressor
The air compressor should always be located in a clean, dry and well ventilated environment. The unit should have at minimum, 12 inches of space on each side. The air filter intake should be free of any debris or obstructions. Check the air filter on a daily basis to make sure it is clean and in working order.

Risk Of Fire Or Explosion
This product incorporates snap action switch contacts and a universal electric motor which tend to produce arcs and sparking and therefore should not be exposed to flammable liquids or vapors. This product is not intended for installation or use in a commercial garage or shop environment.

Grounding Instructions
This product should 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. (See the figure below.) The plug must be plugged into an outlet that is properly installed and grounded in accordance with all local codes and ordinances. Check with a qualified electrician or service personnel if these instructions are not completely understood or if in doubt as to whether the tool is properly grounded.

Improper installation of the grounding plug will result in a risk of electric shock. If repair or replacement of the cord or plug is necessary, 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. Check with a qualified electrician or serviceman if the grounding instructions are not completely understood, or if in doubt as to whether the product is properly grounded. Do not modify the plug provided. If it will not fit the outlet, have the proper outlet installed by a qualified electrician.

This product is for use on a circuit having a nominal rating of 120 volts and is factory-equipped with a specific electric cord and plug to permit connection to a proper electric circuit. Make sure the product is connected to an outlet having the same configuration as the plug. An adapter should not be used with this product. If the product must be reconnected for use on a different type of electric circuit, qualified service personnel should make the reconnection.

Extension Cords
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 product. Make sure your extension cord is in good condition. When using an extension cord, be sure to use one heavy enough to carry the current your product will draw. Cords must not exceed 25 feet and No. 12 AWG size must be used. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating.

Break In Procedures
No break in procedure is required by the user.
This product is factory tested to ensure proper operation and performance.

Operating Procedures

Daily Start-Up Procedures

1. Set the Auto-On/Off switch to the Off position.
2. Inspect the air compressor, air hose, and any accessories/tools being used for damage or obstruction. If any of these mentioned items are in need of repair/ replacement, contact your local authorized dealer before use.
3. Close the drain valve.
4. Connect the air hose to the quick connect socket on the regulator assembly by inserting the quick connect plug on the air hose into the quick connect socket. The quick connect socket collar will snap forward and lock the plug into place providing an air tight seal between the socket and plug. To release the air hose push the collar back on the quick connect socket.
5. Plug the power cord into the proper receptacle.
6. Turn the Auto-On/Off switch to the On-Auto position and the compressor will start and build air pressure in the tank to cut-out pressure and then shut off automatically.
7. Adjust the regulator to a PSi setting that is needed for your application and be sure it is within the safety standards required to perform the task. If using a pneumatic tool, the manufacturer should have recommendations in the manual for that particular tool on operating PSi settings.
8. The air compressor is now ready for use. The following inflation and cleaning accessories packaged with this unit should only be operated at maximum pressure of 90 PSI: Blow gun, adapter and inflation needle.
   

Daily Start-Up Procedures

1. Set the Auto-On/Off switch to the Off position.
2. Unplug the power cord from the receptacle.
3. Set the outlet pressure to zero on the regulator.
4. Remove any air tools or accessories.
5. Open the drain valve allowing air to bleed from the tank. After all of the air has bled from the tank, close the drain valve to prevent debris buildup in the valve.

When draining the tank, always use ear and eye protection. Drain the tank in a suitable location; condensation will be present in most cases of draining.

Water that remains in the tank during storage will corrode and weaken the air tank which could cause the tank to rupture. To avoid serious injury, be sure to drain the tank after each use or daily.

Maintenance

NOTE: Any service procedure not covered in the maintenance schedule should be performed by qualified service personnel.

The air compressor should be turned off, unplugged from the power source, air bled from the tank and allowed time to cool before any maintenance is performed.

Do not attempt to remove or adjust the safety valve.

Check the safety valve by performing these three steps:

1. Plug the compressor in and run until shut-off pressure is reached.
2. Wearing safety glasses, pull out on the safety valve ring to release pressure from the tank.
3. The safety valve should close automatically at approximately at 40-50 PSI. If the safety valve does not allow air to be released when you pull out on the ring, or does not close automatically, it must be replaced.

Maintenance Schedule

Items to Check/Change| Before each use or daily
Check Tank Safety Valve| X
Overall Unit Visual Check| X
Drain Tank| X
Check Power Cord for Damage| X

To ensure efficient operation and longer life of the air compressor unit, a routine maintenance schedule should be followed. The following schedule is geared toward a consumer whose compressor is used in a normal working environment on a daily basis.

This compressor is equipped with an automatic reset thermal overload protector which will shut off motor if it becomes overheated. If the thermal overload protector is actuated, the motor must be allowed to cool down before start-up is possible.

NOTE: The motor will automatically restart without warning if the unit is left plugged in to an outlet with the Auto On/Off switch in the on position.

Storage

For storing the air compressor, be sure to do the following:

1. Turn the unit off and unplug the power cord from the receptacle.
2. Remove all air hoses, accessories, and air tools from the air compressor.
3. Perform the daily maintenance schedule.
4. Open the drain valve to bleed all air from the tank.
5. Close the drain valve.
6. Store the air compressor in a clean and dry location.

Troubleshooting Guide

The air compressor should be turned off and unplugged from the power source before any maintenance is performed as well as the air bled from the tank and the unit allowed time to cool. Personal injuries could occur from moving parts, electrical sources, compressed air, or hot surfaces.

check valve results in a constant air leak at the pressure relief valve when there is pressure in the tank and the compressor is shut off. Drain the tank, then remove and clean or replace the check valve.
Air leaks between head and cylinder.| Be sure of proper torque on head bolts. If leak remains, contact a service technician.
Air leak from safety valve.| Operate the safety valve manually by pulling on the ring. If the valve continues to leak when in the closed position, it should be replaced.
Pressure reading on the regulated pressure gauge drops when an accessory is used.| If there is an excessive amount of pressure drop when the accessory is used, replace the regulator.

Adjust the regulated pressure under flow conditions (while accessory is being used). It is normal for the gauge to show minimal pressure loss during initial use of the tool.

Excessive tank pressure.| Move the Auto-On/Off switch to the Off position. If the unit doesn’t shut off, unplug it from the power source and contact a service technician.
Motor will not start.| Make sure power cord is plugged in and the switch is on. Inspect for the proper size fuse in your circuit box. If the fuse was tripped, reset it and restart the unit. If repeated tripping occurs, replace the check valve or contact a service technician.
Thermal overload protector cuts out repeatedly.|

1. Lack of ventilation, room temperature too high. Move to cooler environment.
2. Excessive air usage, compressor too small for this application. Lower rate of consumption.

Excessive moisture in the discharge air.| Remove the water in the tank by draining after each use. High humidity environments will cause excessive condensation. Utilize water filters on your air line.

Water condensation is not caused by compressor malfunction. Be sure the compressor’s air output is greater than your tool’s air consumption rate.

Air leaks from the tank body or tank welds.| Never drill into, weld or otherwise modify the air tank or it will weaken. The tank can rupture or explode. Compressor cannot be repaired. Discontinue use of the air compressor.

Air Compressor Model 921.166420

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