1. Introduction
Thank you for choosing the ProtoArc EC100 Ergonomic Office Chair and Standing Desk set. This manual provides essential information for the proper assembly, operation, maintenance, and troubleshooting of your new office furniture. Designed for optimal comfort and productivity, this set combines an S-shaped dual-back ergonomic mesh office chair with an adjustable standing desk.
Please read this manual thoroughly before assembly and use to ensure safe and efficient operation. Keep this manual for future reference.
Important Safety Information
- Do not exceed the maximum weight recommendation of 280 pounds (127 kg) for the chair and desk.
- Ensure all components are properly assembled and tightened before use to maintain stability.
- Use the product only for its intended purpose: office and working environments.
- Keep children and pets away from the desk during height adjustments.
- Avoid placing liquids directly on the desk surface, especially near electrical components.
- Regularly inspect all parts for wear and tear. Replace damaged components immediately.

Figure 1.1: The ProtoArc EC100 Ergonomic Office Chair and Standing Desk Set. This image displays the complete product, featuring the ergonomic office chair with a mesh back and seat, alongside the adjustable standing desk with a black tabletop and sturdy legs.
2. Product Components
The ProtoArc EC100 set includes the following main components. Please verify that all parts are present and undamaged before beginning assembly. A detailed parts list with diagrams is typically included in the product packaging.
- EC100 S-shaped dual-back ergonomic mesh office chair
- Adjustable standing desk (55x24 inches tabletop)
- Assembly hardware (screws, bolts, tools)
- Power adapter and control panel for the standing desk
3. Assembly Instructions
Assembly of the ProtoArc EC100 Ergonomic Office Chair and Standing Desk requires two people for optimal safety and ease. Please refer to the detailed step-by-step instructions and diagrams provided in the separate assembly guide included in your product packaging. The following provides a general overview.
3.1. Ergonomic Chair Assembly
- Unpack Components: Carefully remove all chair components from the packaging and lay them out on a clean, soft surface to prevent scratches.
- Attach Casters to Base: Insert the casters into the holes on the chair base until they click into place.
- Insert Gas Lift: Place the gas lift cylinder into the center hole of the chair base.
- Assemble Seat and Backrest: Attach the seat cushion to the mechanism, then connect the backrest to the seat assembly using the provided screws.
- Attach Armrests: Secure the 2D armrests to the seat assembly.
- Install Headrest: Attach the rotating headrest to the top of the backrest.
- Connect to Base: Carefully place the assembled seat and backrest onto the gas lift cylinder.
- Final Check: Ensure all screws are tightened and the chair is stable before use.

Figure 3.1: Dimensions and user suitability guide for the ProtoArc EC100 Ergonomic Chair. This image illustrates the chair's measurements and provides a chart recommending ideal weight and height ranges for users.

Figure 3.2: Detailed view of the ProtoArc EC100 chair's cushion construction. This image highlights the layers of the cushion, including breathable air mesh fabric, high-resilience foam, 20 independent springs, and a 9-layer curved wood board for support.
3.2. Standing Desk Assembly
- Unpack Components: Remove all desk components from the packaging and inspect for any damage.
- Assemble Desk Legs: Attach the lifting columns to the foot supports.
- Attach Crossbar: Connect the crossbar between the two lifting columns.
- Mount Tabletop: Carefully place the tabletop onto the assembled frame and secure it with the provided screws.
- Install Control Panel: Mount the control panel to the underside of the desk, usually on the front edge.
- Connect Power: Plug in the power adapter to the desk's control box and then to a power outlet.
- Cable Management: Use the included cable ties or clips to organize power cords and other cables.
- Final Check: Ensure all connections are secure and the desk operates smoothly through its height range.

Figure 3.3: Overall dimensions of the ProtoArc Standing Desk. This image provides detailed measurements of the desk's length, width, height range, and the dimensions of an optional monitor stand.
4. Operating Instructions
4.1. Ergonomic Chair Adjustments
The EC100 chair offers multiple adjustment features to customize your seating experience:
- Seat Height Adjustment: Locate the lever on the right side beneath the seat. Pull the lever up to raise the seat; release to lock. To lower, sit on the chair and pull the lever up.
- Tilt Mechanism: The chair features a two-mode locking tilt mechanism. Use the lever on the left side to unlock the tilt for rocking or lock it at your desired angle (90° for working, 130° for relaxing).
- Tilt Tension: Rotate the round knob under the seat (usually at the front) to adjust the tension of the tilt mechanism. Turn clockwise to increase tension, counter-clockwise to decrease.
- 2D Armrests: The armrests can be adjusted in two dimensions:
- Height Adjustment: Press the button on the side of the armrest and move it up or down. Release the button to lock.
- Rotation: The armrest pads can typically be rotated inwards or outwards to support various postures.
- Rotating Headrest: The headrest can be adjusted for height and angle. Gently push or pull to adjust its position to support your neck and head.
- Adaptive Lumbar Support: The S-shaped dual-back design provides adaptive lumbar support that conforms to your spine. No manual adjustment is typically needed for this feature.

Figure 4.1: Illustration of the ProtoArc EC100 chair's tilt-adjustable backrest. This image demonstrates the two-mode locking feature, allowing the backrest to be set at 90 degrees for efficient working or 130 degrees for comfortable relaxing.
4.2. Standing Desk Operation
The adjustable standing desk features an electric lifting mechanism and a control panel for easy height adjustments:
- Height Adjustment: Use the Up and Down arrow buttons on the control panel to raise or lower the desk to your desired height.
- Memory Presets: The desk typically includes memory buttons (e.g., 1, 2, 3) to save your preferred sitting and standing heights.
- Adjust the desk to your desired height.
- Press the "M" or "Set" button (if available) followed by the desired memory button (e.g., "1"). The desk will beep or flash to confirm the setting is saved.
- To recall a saved height, simply press the corresponding memory button.
- Anti-Collision Feature: The desk may have an anti-collision system that stops and slightly reverses movement if it encounters an obstruction during adjustment.

Figure 4.2: Visual representation of the ProtoArc Standing Desk's wide height adjustment range. This image shows the desk being used by individuals in both sitting (28.35 inches) and standing (46.46 inches) positions, illustrating its versatility for different user heights and preferences.

Figure 4.3: Benefits of using a flexible dual monitor stand for ergonomic posture. This image illustrates how a monitor stand helps achieve eye-level alignment, prevents head tilting, hunching, and bending, promoting a healthier working posture.
5. Maintenance
Proper maintenance will extend the life and appearance of your ProtoArc EC100 office set.
- Cleaning the Chair:
- For mesh and fabric surfaces, use a soft cloth dampened with mild soap and water. Blot gently; do not rub aggressively.
- For plastic and metal parts, wipe with a damp cloth and dry immediately. Avoid abrasive cleaners.
- Cleaning the Desk:
- Wipe the tabletop and steel frame with a soft, damp cloth. For stubborn marks, use a mild, non-abrasive cleaner.
- Ensure no liquids enter the control panel or motor housing.
- Regular Inspection: Periodically check all screws and bolts on both the chair and desk to ensure they are tight. Re-tighten if necessary.
- Cable Management: Keep all cables neatly organized to prevent tripping hazards and damage.
6. Troubleshooting
If you encounter any issues with your ProtoArc EC100 set, please refer to the following common troubleshooting tips:
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair is wobbly or unstable. | Loose screws or improper assembly. | Check and tighten all assembly screws. Ensure casters are fully inserted. |
| Chair height adjustment not working. | Gas lift issue or lever malfunction. | Ensure the lever is fully engaged. If the issue persists, the gas lift may need replacement. Contact support. |
| Desk does not move up or down. | Power supply issue, loose cable, or motor error. |
|
| Desk movement is uneven or noisy. | Obstruction, uneven load, or motor issue. |
|
For issues not covered here, or if troubleshooting steps do not resolve the problem, please contact ProtoArc customer support.
7. Specifications
Detailed specifications for the ProtoArc EC100 Ergonomic Office Chair and Standing Desk:
| Feature | Detail |
|---|---|
| Brand | ProtoArc |
| Model | EC100 (Chair) / 55x24 inches (Desk) |
| Color | Black (Desk), Black/Grey (Chair) |
| Style | Home Office Desk and Chair Set |
| Base Material | Alloy Steel |
| Top Material Type (Desk) | Alloy Steel |
| Finish Type | Steel |
| Special Feature | Ergonomic design for both chair and desk |
| Recommended Uses | Office, Working |
| Included Components | EC100 S-shaped dual-back ergonomic mesh office chair, adjustable standing desk |
| Required Assembly | Yes |
| Recommended People for Assembly | 2 |
| Maximum Weight Recommendation | 280 Pounds (127 kg) |
| Desk Design | Standing Desk |
| Desk Tabletop Thickness | 0.75 Inches |
| Desk Height Range | 28.35 inches to 46.46 inches |
| Desk Lifting Mechanism | Electric |
| Chair Features | S-shaped dual-back, 360° Even Pressure Technology Spring Cushion, adaptive lumbar support, rotating headrest, 2D armrests, two-mode locking tilt (90°/130°) |
8. Warranty and Support
ProtoArc products are designed for quality and durability. For specific warranty information regarding your EC100 Ergonomic Office Chair and Standing Desk, please refer to the warranty card included in your product packaging or visit the official ProtoArc website.
If you require technical assistance, have questions about assembly, operation, or need to make a warranty claim, please contact ProtoArc customer support directly. You can often find contact information on the brand's official website or through the retailer where you purchased the product.
You can also visit the official ProtoArc store for more information and support: ProtoArc Store on Amazon.





