NANWEI 20V Brushless Cordless Screwdriver & Impact Driver User Manual

Introduction

This manual provides essential information for the safe and effective operation, maintenance, and storage of your NANWEI 20V Brushless Cordless Screwdriver and Impact Driver. Please read and understand all instructions carefully before use to prevent accidents and ensure optimal performance.

Safety Instructions

To prevent accidents such as fire, electric shock, and injury, always observe the following safety precautions. Warnings indicate potential for death or serious injury, while notes indicate potential for injury or physical damage.

General Work Site Safety

• Keep the workshop bright and clean at all times. Cluttered or poorly lit areas can lead to accidents.
• Do not use or charge the tool in areas with flammable liquids, gases, or dust. This poses a risk of explosion or fire.
• Keep children and unauthorized persons away from the work area.

Electrical Safety

• Avoid body contact with grounded objects (e.g., pipes, heating appliances, refrigerators) while using power tools to prevent electric shock.
• Do not use or charge the tool body, charger, or battery in rain, damp, or wet conditions. Water ingress can cause short circuits, ignition, or rupture.
• Use only the dedicated charger and battery provided by NANWEI. Using unauthorized components may cause fire or smoke.

Worker Safety Precautions

• Focus on your work. Do not operate the tool when exhausted or under the influence of alcohol.
• Always use appropriate safety protective equipment, including protective glasses, dust masks, non-slip shoes, helmets, and earplugs as required by the task.
• Wear proper clothing. Avoid baggy clothing, necklaces, or accessories that could get caught in rotating parts. Use rubber gloves and non-slip footwear for outdoor work. Secure long hair with a hat or hair cover.
• Maintain a stable posture and balance at all times.
• Avoid unexpected starts. Keep hands off the switch when handling or carrying the tool or battery.

Tool Usage Precautions

• Do not force the tool. Operate at a speed appropriate for the tool's capacity. Avoid locking the motor, which can cause smoke and ignition.
• Use the correct power tool for the job. Do not use small tools for tasks requiring larger ones.
• Do not use a tool that cannot be started or stopped by the switch. Have it repaired immediately.
• Ensure all adjustment keys and wrenches are removed before turning on the power.
• Inspect for damaged parts before each use. Ensure protective covers and other components are functioning correctly.
• Do not use a charger with a damaged power plug or cord, or if it has been dropped or damaged.
• Keep tool tips sharp and clean for smooth and easy operation.

Battery and Charger Usage Cautions

• Remove the battery only after the machine has completely stopped working.
• Confirm the battery is properly installed before use.
• If abnormal heat generation occurs during charging, immediately unplug the power supply and stop charging.
• Do not charge damaged or broken batteries.
• After charging, turn off the power and remove the battery. Do not leave the battery plugged into the charger for extended periods.
• Do not insert an already charged battery into the charger when the machine is not in use.
• Do not modify, disassemble, throw, nail, or hit the battery. Do not expose batteries to fire or heat.
• Do not charge on flammable surfaces (paper, cloth, carpet, vinyl) or in areas with lacquer, paint, benzene, thinner, gasoline, gas, glue, or excessive dust.
• Do not obstruct charger ventilation or insert metal/flammable materials into openings.
• Keep foreign objects away from the battery charging terminals.
• Do not use the charger for purposes other than charging NANWEI batteries.
• Do not charge, use, or store the battery near fire or in hot places, as this may cause deterioration, smoke, or fire.

Product Overview

Your NANWEI tool is a versatile 20V brushless cordless driver, available in two main models: the NW-S8240 Impact Driver and the NW-S8050 Cordless Driver.

Key Components

Package Contents

The package contents vary depending on the SKU configuration. Typically, it includes:

Setup

Battery Installation and Removal

1. Installation: Insert the battery firmly in the direction of the arrow until it 'clicks' into place. Ensure the connector is fully engaged. A loosely inserted battery may fall out during operation.
2. Removal: Pull the lever in the opposite direction of insertion to release and remove the battery. Do not force it.

Note: Only use batteries specified by NANWEI to avoid ignition or explosion.

Charging the Battery

For optimal performance, fully charge the battery before its first use.

1. Plug the charger's power plug into a power outlet. The charger's blue light will turn on, indicating it's ready for charging.
2. Connect the battery pack to the charger. The light will change from blue to red, indicating charging has begun.
3. Once the battery is fully charged, the blue light will illuminate again. Remove the battery pack from the charger.
4. Unplug the charger from the power outlet.

Note: If charging multiple batteries, allow the charger to cool for 5 minutes between charges to prevent overheating and potential failure. Charge batteries within an ambient temperature range of 10°C to 40°C. If the battery is hot immediately after use, let it cool down before charging.

Operation

Fitting and Removal of Bits/Cutters

Always switch off the tool and remove the battery pack before mounting or dismounting bits or drills to prevent accidental starting and injury.

1. Installation (NW-S8240 Impact Driver): Pull the sleeve upwards, insert the bit firmly and completely. Gently pull the bit to ensure it is securely locked.
2. Removal: Perform the installation steps in reverse order.

Forward/Reverse Switching

The direction of rotation can be changed using the forward/reverse switching lever located near the trigger.

• Push the lever in the direction of the forward arrow for clockwise rotation (right when viewed from the back of the main body).
• Push the lever in the direction of the reverse arrow for counter-clockwise rotation (left when viewed from the back of the main body).
• If the lever is in the middle position, the trigger cannot be pulled, acting as a safety lock.

Note: Always operate the forward/reverse switching lever when the motor has completely stopped rotating. Set the lever to the center position for storage, transportation, or when changing bits.

Speed and Torque Settings

NW-S8240 Cordless Impact Driver (240NM)

This model features four speed/torque modes, allowing you to adjust the impact force and tightening power according to the task.

• Mode 1 (1200 RPM / 60 N.m): For delicate tasks where excessive tightening could damage the workpiece or screw (e.g., small screws, soft materials).
• Mode 2 (1900 RPM / 120 N.m): Suitable for general tightening and finishing work (e.g., stone board, finishing materials).
• Mode 3 (2500 RPM / 180 N.m): For tasks requiring more power and speed.
• Mode 4 (3200 RPM / 240 N.m): Maximum power and speed for demanding applications like long screws or bolts.

NW-S8050 Cordless Driver (50NM)

This model offers 20+1 torque settings and two speed ranges.

• Torque Settings (20+1): Adjust the clutch handle to select the desired torque. Start with lower settings for small screws or soft materials and increase as needed to prevent damage.
• Speed Settings: Low Speed (500 RPM) and High Speed (1600 RPM) for various applications.

Drilling in Metal

When drilling into metal, first mark the desired hole location with a center punch. For improved bit sharpness and durability, use commercially available cutting oil (e.g., cutting oil, gear oil, sewing machine oil).

Note: Applying excessive force will not increase drilling speed and can damage the drill and tool, shortening its lifespan. If the drill gets stuck, switch to reverse mode and firmly grip the tool body to remove it. Do not drill into materials that may contain hidden objects like nails.

Tightening and Loosening Screws

Use the appropriate driver bit for the screw head. Using incorrect bit sizes can damage the screw head. Adjust the torque setting (NW-S8050) or speed mode (NW-S8240) according to the screw size and material. For large diameter screws or hard materials, pre-drilling a pilot hole is recommended.

Reverse Rotation Auto-Stop Function (NW-S8240)

In reverse mode, the speed is fixed. Pressing the gearshift button toggles the automatic stop function. When indicator No. 3 is lit, auto-stop is on; when unlit, it's off. When enabled, the rotation automatically stops before the bolt or nut fully detaches, preventing loss of fasteners.

Ring-Shaped Shadowless Lighting

Both models feature a ring-shaped LED light around the chuck to illuminate the work area, ensuring no shadows and improved visibility.

Application Modes (NW-S8240)

The NW-S8240 is designed to handle various scenarios with specific modes:

• Wood Mode: Optimized for driving screws into wood.
• Thin Iron Mode: Suitable for working with thin metal sheets.
• Thick Iron Mode: Provides increased power for thicker metal applications.
• Full Speed Mode: Delivers maximum speed for rapid fastening.

Maintenance & Storage

Maintenance

Always turn off the tool and remove the battery before any inspection or maintenance.

• Clean the tool with a dry cloth or a cloth dampened with soapy water.
• Keep the air inlet clean and free from obstructions.

Note: Do not wash the tool with water, as this can cause internal damage. Avoid using gasoline, benzene, thinner, or alcohol, which can cause discoloration, deformation, or cracking.

Battery Longevity

• Charge the battery when you notice a decrease in tool power.
• Do not overcharge a fully charged battery.
• If storing for a long period, charge and discharge the battery every two months, then store it fully charged. Remove the battery from the tool or charger during storage.

Storage

• Store the tool and batteries in a dry place with low humidity. Avoid wet locations like eaves.
• Do not store in areas with sudden temperature changes, direct sunlight, or temperatures above 45°C or below -20°C.
• Keep out of reach of children.
• Avoid storing near volatile substances that could ignite or explode.
• To prevent short circuits, keep batteries away from metal objects.

Specifications

NW-S8240 20V Brushless Cordless Impact Driver

NW-S8050 20V Brushless Cordless Driver

Note: Specifications are subject to change without notice for product improvement. The battery is not fully charged at the time of shipment; please fully charge it before first use.

Troubleshooting

• Tool not operating or abnormal sound: If the machine is in poor condition or makes abnormal sounds during use, immediately turn off the switch and stop using it. Contact your dealer for inspection and repair.
• Reduced drilling speed or tool damage: Avoid applying excessive force when drilling. This does not increase speed and can damage the drill bit and the tool, shortening its service life.
• Battery not charging: Ensure the charger is plugged in correctly and the battery is properly seated. Check for abnormal heat generation. Use only dedicated NANWEI chargers and batteries.
• Screw head or material damage: Ensure you are using the correct bit size and appropriate torque/speed settings for the screw and material. For soft materials or small screws, use lower torque settings.

User Tips

• For Metal Drilling: Always use a center punch to mark your drilling spot. Applying cutting oil (e.g., gear oil, sewing machine oil) can significantly improve bit sharpness and extend the life of your iron extrusion bits.
• Preventing Screw Damage: When working with small diameter screws or soft materials, carefully adjust the torque. Starting with a lower torque setting and gradually increasing it can help prevent stripping screw heads or damaging the workpiece.
• Battery Care: To maximize battery life, avoid fully discharging it frequently. Charge it when power starts to diminish, and store it fully charged if not in use for extended periods.

Warranty & Support

Your NANWEI tool comes with a 1-Year Zero-Hassle Warranty, ensuring peace of mind regarding product quality and performance.

For any repairs, technical assistance, or warranty claims, please contact the dealer from whom you purchased the product. They will provide guidance and support.

A detailed user manual in PDF format is also available for download: User Manual (PDF)