ENGWE L20 Electric Bike User Manual

1. Important Warning

This manual includes important safety performance information and service information. Please make sure you have read the following warning content before the first time you use our product.

If you borrow your electric bicycle to other people, please let the user read this manual; it could help to decrease the risk of accident.

Please wear a suitable and safe helmet before riding. Please wear clothes with fluorescent and reflective stripes when you ride at night. Do not exceed the speed limit, as it is a main reason for traffic accidents. We should abide by the traffic rules and should not exceed the speed limit.

Do not touch the charging hole on the bike, or use metal to touch it, otherwise, the accident will be caused by the transient short circuit of the current.

Zero starting, braking frequent, driving against the wind, carrying people or anything, and insufficient air pressure on the tires will all use much electric energy and then reduce the endurance mileage. If you want the best endurance mileage, please do the following:

1. Please use assist mode.
2. On the premise of safety, do not brake frequently or use zero starting.
3. Do not overload.
4. Before riding, please check the pressure of the tire and supply enough pressure.

Our E-bike should avoid prolonged exposure to the sun or rain. Avoid storage in places with high temperature or corrosive gas, so as to avoid electroplating parts and paint surface damage by chemical corrosion and electrical parts damage, resulting in operational failure and accidents.

Your current insurance business may not cover the situation you may encounter when riding an electric bike. Please contact your insurance company or insurance broker for relevant consultation.

If you use our e-bike in your country, please refer to the local laws and regulations. For example, in China, riding an electric bicycle requires reaching the age of 16.

Bicycles are vehicles with certain risk factors. Please be sure to abide by the traffic rules. At the same time, when emergency braking, brake the rear wheel first, then brake the front wheel. When cycling speed is too fast, there is a danger of tipping over if you brake the front wheel suddenly. Please ride carefully.

2. Product Components

The electric bike consists of the following components:

• 1. Display
• 2. Handlebar
• 3. Front basket
• 4. Front light
• 5. Fork
• 6. Tire
• 7. Pedal
• 8. Crank set
• 9. Battery
• 10. Chain
• 11. Freewheel
• 12. Motor
• 13. Rear light
• 14. Seatpost
• 15. Saddle

A diagram shows the numbered components of the electric bike.

3. Technical Parameters

4. Product Installation

Tool Checklist

The following tools are included for installation:

• Phillips Screwdriver
• 8-10mm Wrench
• 13-15mm Wrench
• 14-17mm Wrench
• 4mm Hex Key
• 5mm Hex Key
• 6mm Hex Key
• Charger
• Bicycle-Pedals

4.1 Install the Handlebar

1. Remove the handlebars and packing material. Place the center at the riser clamp.
2. Install using a 4mm hex key clockwise. Do not fully tighten the 4 bolts initially. Adjust the handlebar to the proper angle, then tighten the 4 bolts with appropriate force.

4.2 Install the Front Wheel

1. Remove the front wheel and packing material. Install the screw gasket shaft sleeve according to the drawing.
2. Place the front wheel in the front fork card slot and secure it with a 15mm wrench.

4.3 Install the Front Mudguard

1. Connect the lifting lug of the mudguard to the hole of the front fork axle pipe, and then thread in the screw to tighten it using a 5mm hex key.
2. Align the mudguard support with the front fork mudguard take-up hole position, and then thread in the screw for tightening.

4.4 Install the Front Basket

1. Remove the basket and packaging material. Install the screw gasket according to the drawing using a 4mm hex key.
2. Install 4 bolts clockwise using a 4mm hexagon wrench and place the harness in the front shelf hook.

4.5 Install the Headlight

1. Install the headlight screw washer nut according to the drawing.
2. Secure the headlight line as shown in the figure, using a zip tie.

4.6 Install the Pedals

1. Prepare the left and right pedals. The pedal marked "R" is installed on the side of the chainring, and the pedal marked "L" is opposite to the chainring.
2. Tighten the right pedal "R" clockwise and the left pedal "L" counterclockwise using a 15mm wrench.

5. Display Instructions

1. Product Name and Model Name

Intelligent LCD display for e-bike; model: YL81C.

2. Specifications

• 36V/48V power supply
• Rated working current: 15mA
• Maximum working current: 30mA
• Leakage current at power-off: <1uA
• Working current at the supply controller end: 50mA
• Working temperature: -20~60℃
• Storage temperature: -30~70°C

3. Appearance and Dimension

A close-up image of the intelligent LCD display is shown.

4. Function Overview and Functional Area Layout

4.1 Function Overview

Display YL81C provides a variety of functions to meet the riding needs of users, including:

• Battery level indicator
• Assist level adjustment and indication
• Headlight indicator
• Speed indicator (including real-time speed, maximum speed (MAXS), and average speed (AVG))
• Distance indicator (including ODO and trip distance (Trip))
• Error code indicator
• Bluetooth connection indicator (reserved)
• Parameter setting function

4.2 Functional Area Layout

A diagram illustrates the layout of the display, showing indicators for battery level, speed, assist level, trip distance, ODO, Bluetooth, and headlight. It also shows speed units (km/h, MPH) and distance/speed units.

4.3 Button Definitions

There are three buttons on the operating unit of display YL81C: the on/off button, plus button [+], and minus button [-].

5. General Operation

5.1 Power On/Off

By pressing and holding the [power button], the display will start to work, and the working power supply of the controller will be turned on. In the power-on state, by pressing and holding the [power button], your e-bike will be powered off. In the power-off state, the display will no longer use the battery power, and its leakage current will be less than 1uA.

If your e-bike is not used for more than 10 minutes, the display will be automatically powered off.

5.2 Display Interface

After the display is turned on, the display will show the real-time speed (km/h) and the trip distance (km) by default. By pressing the [power button], the information displayed will be switched between the trip distance (km), ODO (km), maximum speed (km/h), and average speed (km/h).

When the distance reaches 9999.9 km, it will be automatically reset to zero.

5.3 Push Assistance

By pressing and holding the [- button], the electric push assistance mode will be enabled. Your e-bike will run at a constant speed of 6km/h. The display will show level P. By releasing the [- button], your e-bike will immediately stop power output and return to the state before push assistance.

The push assistance function can only be used when you are pushing your e-bike. Please do not use it during riding.

5.4 Headlight On/Off

By pressing and holding the [+] button, the controller will turn on the headlights and the display backlight will turn dark. By pressing and holding the [+] button again, the controller will turn off the headlights and the display backlight will resume its luminance.

5.5 Assist Level Selection

By pressing the [+] and [-] buttons, the e-bike assist level will be switched to change the motor output power. The assist levels available for the display include levels 1-5.

5.6 Battery Level Indicator

The battery level indicator consists of five segments. When the battery is fully charged, the five segments will be all on. In case of low voltage, the outline of the battery indicator will flash, which means the battery has to be charged immediately.

5.7 Error Code Indicator

When a fault occurs in the electronic control system of your e-bike, the display will automatically indicate the error code in the distance area in the format of E0**. Detailed definitions of error codes are shown in Schedule 1.

A diagram shows an example error code "E002" on the display.

When an error code appears on the display interface, please conduct troubleshooting in time. Otherwise, your e-bike will not work normally.

6. General Setting

All parameters can only be set when your e-bike stops. The steps for general setting are as follows:

In the power-on state, when the display shows the speed of 0:

6.1 Trip Distance Reset

Press and hold the [power button] and [- button] at the same time for more than 2 seconds to reset the trip distance.

6.2 Factory Reset

dEF refers to factory reset. dEF-n represents not to restore factory settings, and dEF-y represents to restore factory settings. Press and hold the [power button] and [+] button at the same time for more than 2 seconds to enter the factory reset interface, and press the [+] button to select a parameter.

6.3 Speed Limit Setting

P3 represents the speed limit setting option. The adjustable range is 10~40km/h. Press the [power button] to enter the parameter modification interface. Press the [+] button for parameter selection. Press the [- button] to save the parameter and return to the selection interface of general setting options.

Diagrams show the display indicating P3 with speed and units.

6.4 Metric/Imperial System Setting

P4 refers to the metric/imperial system setting option. 00 represents the metric system, and 01 represents the imperial system. Press the [power button] to enter the parameter modification interface. Press the [+] and [-] buttons for parameter selection. Press the [power button] to save the parameter and return to the selection interface of general setting options.

Diagrams show the display indicating P4 with metric (00) and imperial (01) settings.

Schedule 1 Error Code Definitions

This schedule provides definitions for error codes related to different protocols.

6. Battery

• How far a fully charged battery can go depends on the loading weight, road condition, and battery capacity. However, under the same conditions, average speeds can allow for longer travel range.
• When storing the battery for a longer time (e.g., during winter time), it is important to place the fully charged battery in a dry place.
• Attention: The battery should be recharged once every 2-3 months when it is not used.

WARNING:

• Keep the battery out of reach for children.
• Never try to open the battery.
• Only use the ENGWE supplied battery. Do not use a battery from any other different product models.
• If the battery is damaged because it has been dropped somewhere or involved in a biking accident, there may be a risk of electrolytes leakage. Beware of chemical burns! Immediately stop using the damaged battery.
• Do not touch the battery without a cloth or gloves and make sure no acid touches your eyes.
• Do not store the battery in temperatures above 95°F or below 23°F.

Do not allow the battery to run down completely before charging. Charge the battery before storing the product. If the battery is completely empty, it may cause the battery to no longer charge.

Charge a new battery for at least 4-6 hours before you use it in your product for the first time. Never charge the battery for too long. Overheating or undercharging the battery may shorten battery life and decrease product run time.

IMPORTANT: BATTERY DISPOSAL

• Battery must be recycled or disposed of in an environmentally sound manner.
• Do not dispose of the battery in a fire. The battery may explode or leak.
• Do not dispose of a battery in your regular household trash.

7. Charging

• You can charge the bike directly, or you can remove the battery for charging.
• The RED light indicates it is charging, and the GREEN light indicates the battery is fully charged. (Please unplug from the wall.) Usually, the charging time is 4-6 hours, depending on the remaining battery capacity.

WARNING:

• Charging time over 10 hours is prohibited. Please keep it away from high temperature environments and store it in a cool place.
• Please make sure that the battery charger and charging plug are always kept dry and never get wet.
• The charger should only be cleaned with a dry cloth. Never use a wet cloth, oil, or any other liquid.
• Do not connect positive and negative terminals.
• Stop the charging procedure immediately if you notice anything unusual.
• It is strictly forbidden to cut the battery charging and discharging lines.
• It is strictly forbidden to disassemble the battery box or modify the internal structure and protection board of the lithium battery.
• After using the battery, please charge it within 12 hours.

If the product has problems during the protection period, ENGWE will provide customer service as part of the product quality guarantee.

8. Warranty Policy

Dear customer!

Thank you for purchasing ENGWE series products!

Warranty Service:

Please visit the official website https://engwe-bikes.com/ to view the warranty policy of Engwe.

After purchasing Engwe products, please contact Engwe after-sales service for help when there is a quality issue. This means you can contact the customer service of the seller where you bought your e-bike from.

Please provide your order number, purchase interface, and videos of the issue.