SIHOO Doro C300L-A3 Ergonomic Office Chair Installation Guide

Product Overview

The SIHOO Doro C300L-A3 is designed for comfort and ergonomic support. Key features include adjustable backrest, armrests, and height, along with a dynamic lumbar support system.

Model: DORO-C300L-A3

Dimensions: 70*70*107 (128) CM

Website: www.sihoooffice.com

Assembly Introduction

Follow these steps carefully to assemble your chair. Ensure all parts are present before beginning.

1. Attach the five chair leg tubes to the base with ten chair leg screws. Insert the wheels.
2. Place the gaslift and decorative cover into the middle hole of the chair feet.
3. Connect the mechanism to the seat cushion using four M6*14 mechanism screws and small shims. Ensure correct front/rear orientation.
4. Align the cushion, chassis, and footrest assembly with the chassis holes and insert the pneumatic bar.
5. Attach the handrail to the handrail bracket using four M6*30 screws, spring spacers, small shims, and handrail tube spacers.
6. Insert the seat back into the chassis tailpiece of the cushion, chassis, and footrest assembly.
7. Attach the armrests to the back linkage with four M8*78 screws and four big shims. Then, attach the seat back and chassis tail plate with three M8*20 screws and three big shims.
8. Insert the headrest into the back of the chair and attach it with two M6*16 screws. Put on the back trim cover. The chair is now complete.

Safety Instructions:

• One chair supports one person's weight.
• Use on a flat floor.
• Children under 5 should not sit alone on the chair.
• Do not sit on the armrest.
• Do not stand on the chair or use it as a ladder.
• Do not overload the chair.
• Avoid sharp objects and fire.
• Do not insert fingers into the mechanism while seated.

Parts List

General Accessories:

• Wheels: 5 pcs
• Chair leg tubes: 5 pcs
• Base: 1 pc
• Pneumatic bar: 1 pc
• Headrest: 1 pc
• Armrests: 1 pair
• Armrest brackets: 1 pair
• Seat cushion*chassis assembly: 1 pc
• Seat back: 1 pc
• Mechanism: 1 pc

Hardware:

• Big shim: 7+1 pcs
• Chair leg screws (M6*12): 10+1 pcs
• M6 spring spacer: 4+1 pcs
• Armrest screws (M6*30): 4+1 pcs
• Armrest bracket screws (M8*78): 4+1 pcs
• Small shim: 8+1 pcs
• Armrest tube spacers: 2 pcs
• Seat back fixing screws (M8*20): 3+1 pcs
• Headrest screws (M6*16): 2+1 pcs
• Mechanism screws (M6*14): 4+1 pcs
• Hexagonal spanner: 1 pc
• T-wrench: 1 pc
• Seat back trim cover: 1 pc
• Decorative cover: 1 pc
• Gloves: 1 pair

Note: Before installation, please classify screws by length for easier assembly.

Chair Functions

• Backrest Adjustment: The backrest can be adjusted up or down in 4 positions.
• Height Adjustment: Raise the handle to adjust the chair's height.
• Recline Adjustment: Pull out the handle to adjust the recline angle (3 levels available); push in to lock the angle.
• Headrest: Adjustable headrest with lift and swivel function.
• Armrests: Adjustable upwards, with inward/outward rotation of the armrest angle, and forward/backward adjustment.

Maintenance and Cleaning

• Regularly check that all screws and parts are tightened.
• Clean the chair with a soft, damp cloth. Avoid abrasive cleaners.
• Periodically clean wheels of debris like carpet fibers.
• The seat and backrest covers of the A3 series are user-replaceable.

Help Center

About Products:

• Backrest mesh broken: Contact SIHOO for a replacement.
• Chair too short: Adjust to maximum height. If still unsuitable, consider changing the gas lift.
• Damaged or incorrect product: Contact SIHOO immediately with all packaging materials.
• Noises: Ensure all parts are tightly installed. Send a video if the issue persists.
• Armrest shaking: Check screw tightness and armrest pad.
• Backrest shaking: Ensure the backrest is tightly installed; reinstall if necessary.
• Abnormal odor: Air out the chair in a ventilated room for 2-3 days.
• Scratches or cracks: Contact SIHOO for replacement parts if normal use is affected.
• Missing parts: Inform SIHOO with order number and photos of received parts.
• Discomfort: Send a photo or video to help SIHOO diagnose and solve the problem.

About Delivery:

• Delivery Time: Typically 3-8 days within the continental U.S.
• Delayed Delivery: Due to COVID-19, shipping delays may occur. SIHOO will track the shipment.
• Dispatch Issues: Contact SIHOO to confirm address and report to the carrier.
• Shipping Information Not Updated: Delays may occur due to high order volume.

About Orders:

• Order Cancellation: Possible for undelivered or delayed items. Inventory items ship within 24-48 hours. Customized orders cannot be canceled.
• Lost Orders: Contact the responsible logistics center. SIHOO can assist if needed.

Certifications and Standards

• Construction Basis: SIHOO Series adheres to modern seating technology standards.
• Certifications: SGS + TÜV Rheinland LGA certified. Complies with EN 1335-1/-2:2018 (Office Chairs) and EN 16955:2017 (Gas Springs) / EN 12529 (Castors).
• Warranty: 3-year warranty on the chair.
• European Representative: Like Sun GmbH, Planckstr. 59 / 45147 Essen. Contact: +49 1726894470 / Ec-connection@web.de