Furniture / Chairs & Seating
Assembly and User Guide for Wayfair FYC 239-Ergo-4 Ergonomic Office Chair
Complete assembly and adjustment guide for the Wayfair FYC 239-Ergo-4 ergonomic office chair. This manual covers step-by-step assembly of the base, seat, and armrests, as well as instructions for using the 4D armrests, seat height, and...
Quick answers from the manual
Quick answer
- This manual provides assembly instructions and adjustment guides for the Wayfair FYC 239-Ergo-4 ergonomic office chair, including seat height, backrest tension, and 4D armrest settings. p. 2, 3, 4, 5
Key actions
- Assemble backrest to mechanism p. 2
- Assemble armrests and mechanism to seat p. 3
- Insert castors and gas lift p. 3
First start
- Assemble the chair components using the provided bolts (J) and wrench (I), then insert the gas lift and castors into the base. p. 2, 3
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Where to find it in the PDF
- Parts List p. 2
- Assembly Instructions p. 2, 3
- Adjustments p. 4, 5
Table of contents
Manual images
Click an image to enlargeQuick Guide
This guide provides instructions for assembling and adjusting the Wayfair FYC 239-Ergo-4 ergonomic office chair. Ensure you have all parts (A-J) before beginning assembly. The chair features multiple adjustment points, including seat height, backrest tension, backrest angle, and 4D armrests.
Parts List
- A: Backrest
- B: Seat
- C: Mechanism
- D: Armrest set
- E: Gas lift
- F: Base
- G: Castors (5 pcs)
- H: Bolts 8mm*19mm (3 pcs)
- I: Wrench
- J: Bolts 8mm*32mm (10 pcs)
Assembly Instructions
- Backrest Assembly: Attach the backrest (A) to the mechanism (C). Use the slide level (1) on the mechanism to move the top part and expose the fixing holes.
- Armrest Assembly: Assemble the armrests (D) to the seat (B) using 6 bolts (J) and the wrench (I).
- Mechanism Assembly: Fix the mechanism (C) to the seat (B) using 4 bolts (J) and the wrench (I).
- Base Assembly: Insert the castors (G) into the base (F) (some force may be required). Insert the gas lift (E) into the base (F).
- Final Assembly: Place the assembled seat/mechanism/backrest unit onto the gas lift (E).
Chair Adjustments
The chair includes several adjustment handles and knobs:
- Seat Height (2): Use handle (2) to adjust the seat height.
- Backrest Tension (4): Turn the big knob (4) to adjust the tension of the backrest when it is not locked in a fixed position.
- Backrest Angle (5): Press level (5) forward to lock the backrest angle, or backward to unlock and adjust.
- Seat Slide (1): Press level (1) upwards and pull the seat to slide it forward or backward.
- Backrest Height: Move the backrest up or down to adjust the height.
- 4D Armrests: The armrests are adjustable in height, width, depth (forward/backward), and pivot angle.
Manufacturer information
Wayfair LLC
Practical help
Before use
- Ensure all bolts (J) are tightened securely using the provided wrench (I).
- Verify that all 5 castors (G) are fully inserted into the base (F).
- Check that the gas lift (E) is properly seated in the base.
- Test all adjustment handles (1, 2, 5) to ensure they move freely.
Specs in practice
- Backrest Tension (4)
- Adjusts the resistance of the backrest when reclining.
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Images and diagrams
- The manual uses a letter-coded parts list (A-J) and numbered adjustment handles (1-7) to guide assembly and operation.
Manual page author
David Miller
Documentation analyst