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4

5

 4.  Press the Increase (+) and Decrease (–) Pressure Control Buttons to select the desired 

pressure from a range pre-set values (between 3 and 120), which will display on the 

backlit LCD screen. Hold the Button to scroll upward or downward more quickly. Once 

the desired pressure has been reached, release the Button and wait two seconds. The 

digital display will flash the new selected pressure, as in the following example:

  This pressure value is now stored in the unit’s memory until it is manually reset.

 5.  Press the Power Button once more to begin inflation. The digital display will only show 

the current pressure of the object (which will light solid) to indicate that the compressor 

is working. Monitor the pressure on the LCD screen.

 6.  When desired pre-set pressure is reached, the compressor will stop automatically. Press 

and hold the Power Button for one second to turn off the unit.

 7.  Unscrew and remove the SureFit® nozzle from the valve stem.

IMPORTANT AUTO MODE OPERATING NOTES: 

• 

To interrupt the inflation process, press the Power Button once. To resume the inflation 

process, press the Power Button again.

• 

To switch to Manual Mode, press the Power Button once to stop the inflation process, 

then press the Compressor Trigger. (The unit cannot switch to the Manual Mode while 

it is inflating.) 

• 

To shut down the unit at any time, press and hold the Power Button for one second.

• 

To select a new pressure value, press the Power Button once, then press the Increase (+) or 

Decrease (–) Pressure Control Buttons and resume the inflation process at step 5.

• 

After pressing the Power Button at any time during operation, the unit will automatically 

shut down after one minute if no further actions are taken.

Inflating Tires or Products with Valve Stems in 

Manual Mode

In the Manual mode, the Compressor Trigger on the front of the unit is used to operate the 

compressor until the desired pressure value is reached.

 1.  Make sure all charging adapters are disconnected.

 2.  Screw the SureFit® nozzle onto the valve stem. Do not overtighten.

 3.  Press the Power Button to turn the unit on. The backlit LCD Screen will display the 

following, indicating the unit is in Standby Mode:

  The digital display will alternately show the flashing pre-set PSI value (that was last set 

by the Pressure Control Buttons) for 2 seconds; then it will flash the current pressure of 

the item being inflated for 5 seconds (which will then light solid).

 

IMPORTANT: 

If no other actions are taken after pressing the Power Button, the unit 

will automatically shut off after one minute of inactivity.

 4.  Press the Compressor Trigger to begin the inflation process. The digital display will 

only show the current pressure of the object (which will light solid, as in the following 

example) to indicate that the compressor is working. Monitor the pressure on the LCD 

screen.

 5.  When the desired pressure is reached, release off the Compressor Trigger and the 

compressor will stop. Press and hold the Power Button for one second to turn off the 

unit.

 6.  Unscrew and remove the SureFit® nozzle from the valve stem.

IMPORTANT MANUAL MODE OPERATING NOTES: 

• 

To interrupt the inflation process, release the Compressor Trigger. To resume the inflation 

process, press the Compressor Trigger again.

• 

To switch to Auto Mode, release the Compressor Trigger, then press the Increase (+) or 

Decrease (–) Pressure Control Buttons 

or

 the Power Button. (The unit cannot switch to the 

Auto Mode while it is inflating.) 

• 

To shut down the unit at any time, press and hold the Power Button for one second.

• 

In this mode, the unit will automatically shut down after one minute of inactivity.

Inflating Other Inflatables Without Valve Stems

Inflation of other items requires use of the nozzle adapter.

 1. Make sure all charging adapters are disconnected. 

 2.  Screw the nozzle adapter into the SureFit® nozzle. Do not overtighten.

 3.  Insert the nozzle adapter into item to be inflated.

 4.  Press the Power Button to turn the unit on. The backlit LCD Screen will display the 

following, indicating the unit is in Standby Mode:

  The digital display will alternately show the flashing pre-set PSI value (that was last set 

by the Pressure Control Buttons) for 2 seconds; then it will flash the current pressure of 

the item being inflated for 5 seconds (which will then light solid).

 

IMPORTANT: 

If no other actions are taken after pressing the Power Button, the unit 

will automatically shut off after one minute of inactivity.

 5.  Follow either steps 4 through 6 in the “Inflating Tires or Products With Valve Stems at 

Auto Mode” section or steps 4 through 5 in the “Inflating Tires or Products With Valve 

Stems at Manual Mode” section.

  IMPORTANT NOTE: 

Small items such as volleyballs, footballs, etc. inflate very rapidly. Do 

not over-inflate.

 6.  Disconnect the nozzle adapter from the inflated item.

 7.  Unscrew and remove the nozzle adapter from the SureFit® nozzle.

CAUTION – TO REDUCE THE RISK PROPERTY DAMAGE:

• 

Always allow the unit to cool before storing it.

• 

To prevent hose damage, secure the compressor hose and SureFit® nozzle using the 

Storage Clips after each use.

• 

Recharge the unit fully after each use.

USING THE 2-LED AREA LIGHT

The Area Light is controlled by the Compressor. When the Compressor is turned on, the Area 

Light is activated. When the Compressor is tuned off, the Area Light turns off. Press the 

Power Button (refer to the “Features” section to locate) to turn the Compressor and Area 

Light on. Press the Power Button and hold for one second to turn the unit off. Make sure 

the Power Button is turned off when the unit is being recharged or stored.

CARE AND MAINTENANCE

All batteries lose energy from self-discharge over time and more rapidly at higher 

temperatures. When the unit is not in use, we recommend that the battery is charged at 

least every 30 days.
Never submerge the unit in water. If the unit gets dirty, gently clean the outer surfaces of 

the unit with a soft cloth moistened with a mild solution of water and detergent.
There are no user-replaceable parts. Periodically inspect the condition of adapters, 

connectors and wires. Contact manufacturer to replace any components that have become 

worn or broken. 

Battery replacement/disposal

BATTERY REPLACEMENT

The battery should last the service life of the unit. Service life is dependent on a number 

of factors including but not limited to the number of recharge cycles, and proper care and 

maintenance of the battery by the end user. Contact manufacturer for any information 

you may need.

SAFE BATTERY DISPOSAL

Contains a maintenance-free, sealed, non-spillable, lead acid battery,  

which must be disposed of properly. Recycling is required. Failure  

to comply with local, state and federal regulations can result in  

fines, or imprisonment.
Please recycle. 

WARNINGS:

• 

 Do not dispose of the battery in fire as this may result in an explosion.

• 

  Before disposing of the battery, protect exposed terminals with heavy-duty electrical tape 

to prevent shorting (shorting can result in injury or fire).

• 

 Do not expose battery to fire or intense heat as it may explode.

12V DC Charging Adapter Fuse Replacement

The fuse in the plug end of the 12V DC Charging Adapter protects the adapter’s charging 

circuit. If the 120V AC Charging Adapter operates, but the 12V DC Charging Adapter does 

not, then this fuse may be opened (blown).

TO REPLACE THE FUSE:

 1. Unscrew the end cap of the DC plug (counterclockwise).

 2. Remove spring center contact and fuse.

 3. Check fuse with a continuity checker.

 4. If blown, locate a replacement 12 amp fuse.

 5. Replace the fuse, spring, contact and end cap.

 6. Screw end cap clockwise until it is finger tight – DO NOT OVER-TIGHTEN.

 7. Test for proper operation of the 12V DC Charging Adapter.

CAUTION – TO REDUCE THE RISK OF PROPERTY DAMAGE: 

Pull by connector rather 

than cord when disconnecting the 120V AC Charging Adapter from an AC outlet.

WARNING: The 12V DC Charging Adapter is intended for charging the unit 

battery only; attempting to use the 12V DC Charging Adapter as power source for 

the unit may cause it to overheat, causing property damage and injury to persons.

WARNING: Never attempt to use the AC and DC charging methods at the same 

time.

SPECIFIC SAFETY INSTRUCTIONS FOR COMPRESSORS

WARNING – BURST HAZARD:

• 

Carefully follow instructions on articles to be inflated.

• 

Never exceed recommended pressures. Bursting articles can cause serious injury.

• 

Always monitor the pressure on the LCD screen.

CAUTION – TO REDUCE THE RISK OF INJURY OR PROPERTY DAMAGE: 

• 

Never leave the compressor unattended while in use.

• 

Do not operate the compressor at pressures greater than 120 PSI; and do not operate the 

compressor continuously at 120 PSI for longer than approximately 3 minutes. Follow the 

instructions in the “Using the Portable Compressor” section.

SAVE THESE INSTRUCTIONS

INTRODUCTION

Congratulations on purchasing your new 

Stanley

®

 AirPro 120

®

 Cordless Rechargable 

Digital Air Compressor with Digital Gauge

. Read this Instruction Manual and follow the 

instructions carefully before using this unit. 

CHARGING/RECHARGING

Lead-acid batteries require routine maintenance to ensure a full charge and long battery 

life. All batteries lose energy from self-discharge over time and more rapidly at higher 

temperatures. Therefore, batteries need periodic charging to replace energy lost through 

self-discharge. When the unit is not in frequent use, manufacturer recommends the battery 

be recharged at least every 30 days.
Before each use, check the unit’s battery status on the LCD Screen:

• 

Four solid bars on the battery icon indicate a full battery. The unit is ready to use.

• 

Only one or two solid bars on the battery icon indicates that the unit’s battery charge 

level is low. In this case, the battery SHOULD be recharged before use or the built-in low-

voltage protection may activate (the empty battery icon will flash for a short period before 

automatic shut-down). If the unit shuts down, it MUST be recharged immediately.

• 

An empty battery icon indicates the battery MUST be recharged immediately.

Notes: 

This unit is delivered in a partially charged state – you must fully charge it upon purchase and 

before using it for the first time. Initial AC charge should be for 10 hours or until the battery 

icon shows 4 solid bars.

 

Recharging the battery after each use will prolong battery life; frequent heavy discharges 

between recharges and/or overcharging will reduce battery life. The battery must be 

recharged using the 120V AC Charging Adapter.

 

Make sure all other unit functions are turned off during recharging, as this can slow the 

recharging process.

 

The time required to fully recharge the built-in battery depends on the charge status after 

use. Approximate recharging time is 10 hours.

CAUTION: RISK OF PROPERTY DAMAGE:

• 

Failure to keep the battery charged will cause permanent damage and may result in poor 

performance.

• 

Overcharging will reduce battery life. Do not overcharge:

 – Never charge for longer than 10 hours using the 120V AC Charging Adapter.

 – Never charge for longer than 5 hours using the 12V DC Charging Adapter.

Charging the Unit Using the 120V AC Charging 

Adapter (recommended)

IMPORTANT: 

The unit cannot be operated while charging using the AC Charging Adapter.

 1.  Make sure the 12V DC Charging Adapter is disconnected. 

 2.  Insert the barrel connector of the 120V AC Charging Adapter into the 120V AC 

Charging Port on the back of the unit. Plug the 120V AC Charging Adapter into a 

(powered) standard North American 120 volt 60Hz outlet. When the unit is properly 

connected to an AC power source, the LCD Screen will display the following:

  The bars on the Battery Icon represent the charge level of the unit’s internal battery. 

The bars on the Battery Icon will change from empty to solid (from bottom to top) 

repeatedly to indicate that the unit is charging. The backlight will turn on for 10 

seconds (only).

 3.  Charge for approximately 10 hours or until the battery icon shows 4 solid bars. Do not 

overcharge.

 4.  Disconnect the AC Charging Adapter from the unit and the 120V AC power source 

when not in use.

Charging the Unit Using the 12V DC Charging 

Adapter

 1. Make sure the 120V AC Charging Adapter is disconnected. 

 2. Insert the double barrel tip of the 12V DC Charging Adapter into the 12V DC Charging 

Port on the back of the unit.

 3. Insert the grooved tip of the 12V DC Charging Adapter into the vehicle’s 12V DC 

accessory outlet or other functioning 12V DC power source. When the unit is properly 

connected to an DC power source, the LCD Screen will display the following:

  The bars on the Battery Icon represent the charge level of the unit’s internal battery. 

The bars on the Battery Icon will change from empty to solid (from bottom to top) 

repeatedly to indicate that the unit is charging. The backlight will turn on for 10 

seconds (only).

Notes: 

When using a vehicle’s 12V DC accessory outlet as a power source, be aware that some 

vehicles require the ignition be turned on to power the accessory outlet.

 

The bars on the Battery Icon will continue changing from empty to solid (bottom to top) 

repeatedly, but will not show 4 solid bars when using the 12 volt DC charging method. 

Manufacturer suggests that you only use the 12 Volt DC Charging Adapter if the unit needs 

to be charged immediately and no 120 volt power source is available.

 4.  Charge for 5 hours. Do not overcharge.

 5.  Disconnect the DC Charging Adapter from the unit and the 12V DC power source when 

not in use.

CAUTION – TO REDUCE THE RISK OF DAMAGE TO THE UNIT: 

Do not charge for 

longer than 5 hours maximum using this method.

USING THE PORTABLE COMPRESSOR

This 12 Volt DC Air Compressor is the ultimate compressor for all vehicle tires, trailer tires 

and recreational inflatables. The compressor hose with tire fitting is stored on the storage 

clips at the side of unit. A Nozzle Adapter is supplied and is stored in the Nozzle Adapter 

Storage Compartment. Refer to the “Features” section to locate all components.
The 12V DC Air Compressor can be used in either Auto Mode or Manual Mode, as detailed 

in the following sections.

IMPORTANT:

 When the compressor is operated either in the Manual Mode or at a 

low PSI in the Auto Mode, the unit may start in low and gradually rev up. When the 

compressor is operated at higher PSIs in Auto Mode, the unit may operate normally for 

several minutes, then rev down for a few minutes before returning to normal operation. 

This feature protects the unit from overheating during normal use. In any event, do not 

operate the compressor continuously for extended periods of time (approximately 10 

minutes, depending on ambient temperatures), as it may overheat. This could damage the 

compressor. If the compressor must be operated for longer periods: every 10 minutes press 

and hold the Power Button for one second to turn the compressor off, then restart after a 

cooling down period of approximately 30 minutes.

Note: 

The 2-LED Area Light will remain lit as long as the unit is turned on.

WARNING – TO REDUCE THE RISK OF INJURY OR PROPERTY DAMAGE:

• 

Follow all safety instructions found in the “Specific Safety Instructions For Compressors” 

section of this instruction manual.

• 

The Air Compressor is capable of inflating to 120 pounds per square inch (PSI) pressure. To 

avoid over-inflation, carefully follow instructions on articles to be inflated. Never exceed 

recommended pressures. Bursting articles can cause serious injury.

Inflating Tires or Products with Valve Stems in Auto 

Mode

In the Auto Mode, the desired pressure value can be preset and stored in the unit’s memory 

and the compressor will automatically stop once this preset pressure is reached. The Power 

Button turns the unit on and off. The Increase Pressure Control Button (+) and Decrease 

Pressure Control Button (–) are used to select a pressure value for when the compressor is 

used in Auto Mode. All three buttons are located on the control panel on the back of the 

unit (refer to the “Features” section to locate).

 1.  Make sure all charging adapters are disconnected.

 2.  Screw the SureFit® nozzle onto the valve stem. Do not overtighten.

 3.  Press the Power Button to turn the unit on. The backlit LCD Screen will display the 

following, indicating the unit is in Standby Mode:

  The digital display will alternately show the flashing pre-set PSI value (that was last set 

by the Pressure Control Buttons) for 2 seconds; then it will flash the current pressure of 

the item being inflated for 5 seconds (which will then light solid).

 

IMPORTANT: 

If no other actions are taken after pressing the Power Button, the unit 

will automatically shut off after one minute of inactivity.

HRC120DSCA_ManualENFR_082817.indd   4-5

8/28/2017   10:54:51 AM

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