Install guide · Frameless wall cabinet
A handle-less, electric push-to-open lift door — built around your exact front, your real parts order, and a door mounted flush with the wall.
Step 0
This is a lift system, not a pull-out — get these right and the rest is straightforward.
Two separate limits, both exceeded by your build:
Blum is explicit: “exceeding the maximum door height of 600 mm will cause the variable stops and soft-closing to malfunction.” That's the stay-open and the soft-close — the two behaviours you bought this for. Three paths:
Power factor = cabinet height (in) × door weight (lb). Handle-less, so no handle weight. Your ≈ 12.9 lb front at ~24″ gives PF ≈ 310 — inside the 22K2900 range, just near its floor, so run the tension near minimum.
Before anything else
Walk the actual cabinet with a tape measure. Every number here is from Blum's published spec — primarily the "AVENTOS HK top – standard applications" PDF (MD-039/2 · 05.23), the 2019 technical manual, and the HK top FAQ.
Before the install
Cabinet at 782 × 628 mm · full overlay door with 2 mm reveal showing cabinet edge on L/R/T · flush bottom · 1 mm edgebanding all four edges · grain vertical.
1 · Inputs
2 · Substrate cut
Cabinet, minus reveals, minus 1 mm of banding per banded edge:
This is the rectangle to rip + crosscut. Cut it first.
3 · Finished door
Substrate plus 1 mm of banding on every edge:
This is the visible door, banded and ready to hang.
628 mm cabinet − 2 mm top reveal − 0 mm bottom = a 626 mm door — 26 mm over Blum's 600 mm max door height. The "Before you build" gate above covers your three paths; if you're proceeding, install Step 5's "bias tension a touch under balanced" recipe applies.
Blum's overlay = how much the door covers the cabinet panel. For your build: 19 mm panel − 2 mm reveal = 17 mm, both on the side (SFA) and at the top (FAo). The standard-applications sheet locates the plate holes at SFA + 12.5 = 29.5 mm from the side and 62 + FAo = 79 mm from the top (first hole), then 32 mm spacing. Your standard 20S4200 plate is right — the 20S4F01 "with bracket" plate is for 5-piece doors with an inset panel close to the screw, not your slab.
Read it directly: Blum AVENTOS HK top – standard applications PDF (MD-039/2 · 05.23, the canonical doc for this build) · 2019 technical manual, page 9 for the US-version diagram.
Mounting
The client wants the door face flush with the wall. You verified on a unit already installed in their kitchen that the swing clears flush-mounted — here's why, and what to hold to.
From your order
Every item below was on your purchase order, so the colour tells you its job, and the pill on each card tells you its purchase status. The only thing missing is the 606N/606P door-plate screws (Blum lists them separate from the 20S4200 set).
Electric opening
Push the front, it opens electrically; press a switch, it closes with soft-close BLUMOTION. One drive unit, two switches, a set of push-to-open distance bumpers, and one power supply.
The build
Walnut steps are the mechanical lift; teal steps are the SERVO-DRIVE electrics.
Tip: hover any tinted term or rounded part-number chip for a quick definition. (Tooltips need the live HTML page — they won't show in the printed PDF; use the Glossary and Hardware Reference sections there.)
For your build: cabinet 782 × 628 mm (19 mm side panels), door 778 × 626 mm finished (full overlay, 2 mm reveal on L/R/T, flush bottom), overlay = 17 mm (Blum's definition: side-panel coverage), Z ≈ 185 mm, interior depth ≥ 187 mm.
HK top mounts to the cabinet sides — no top panel needed. Clear and vacuum the carcass; sight the side panels for square. Standard 20S4200 plate is correct at 17 mm overlay.
The mechanisms self-position with the integrated locating template — it indexes off the top-front corner of the cabinet side, so position is automatic. Drive 4 × #7 × 35 mm POZI wood screws per mechanism (8 total). Remove the setback template after fastening. Sight across both — level and parallel, or the door racks.
Safety: the lever arms are spring-loaded with a built-in lock — keep them secured until the door is on.
Two 20S4200 plates, 4 × 606N or 606P screws each (8 total). For a slab front on a frameless cabinet, with your 17 mm overlays (19 mm panel − 2 mm reveal, same on side and top):
Reference: Blum AVENTOS HK top – standard applications PDF (MD-039/2 · 05.23) · 2019 technical manual, page 9 for the US-version diagram.
Push the setback (positioning) template down to remove anything residual; slowly raise each arm to upright. One hand under the arm — it's spring-loaded. Then CLIP the door's plates onto the arm assemblies. You'll hear the click on each side.
With the T20 / #2 × 2 TORX bit in a screw gun, dial the spring until the door is weight-balanced — it stays where you let go. At PF ~310 on the 22K2900 you'll land near minimum tension.
If proceeding with the 626 mm door: set tension slightly under balanced — bias the door to drift closed rather than fly open from the partly-open position.
Blum says the cover cap doesn't have to be on or off for this. Tension can be re-dialled any time without removing it.
With the T20, set the three cam adjustments on each side — height, side, depth — until the reveals are even and the front sits flush with the wall. Set the opening-angle screw on both sides to where you want the door to stop (75°–107°; with ~12" overhead, 100°–107° is the usual landing). Open and close by hand once.
These are the little buttons that make "push to open" work. SERVO-DRIVE needs a ~2 mm trigger path: the closed front rests against the bumpers, and a light push moves it those 2 mm to wake the drive, which then opens the door. Press the Ø5 distance bumpers into the back of the front — 2 for a light door like this, up to 4 — spaced symmetrically (one each side near the bottom-outer corners) so the front closes evenly onto them and the reveal stays consistent.
HK top uses 2 switches per cabinet, one per side (Blum FAQ verbatim: “one on the left side and one on the right side”). Bore a 35 mm hole on each side wall with the BM31.2000 template — two holes total. Press a switch into each (push-fit, no screws). Your cover/switch set's switches cover this — the separate 23P5020 ×2 stay as spares.
Clip the 23KA000 drive unit onto the left lift mechanism — tool-free (Blum FAQ: “the drive unit is always mounted on top of the left AVENTOS mechanism”). Route the 1500 mm cable from the drive unit, over the cabinet top and out the back/side, to the power supply via the connecting node. If you drill a carcass pass-through, Ø8–10 mm and chamfer the edges so the cable doesn't chafe. Use the Z10V1000 connector for extra length, tidy with Z10K0009 clips, fit the end protectors at both ends.
Mount the BZ10NE04UG2 power supply somewhere ventilated and serviceable — typically inside an adjacent cabinet or on a stud above the run, not stuffed against the back of the wall cabinet. Standard 120 V outlet. One supply powers up to 16 drive units.
Keep all SERVO-DRIVE cabling the same generation (Flex) so the connectors mate.
Power on. The drive unit self-commissions, guided by colour-signal LEDs — it learns the door, calibrates collision detection. No synchronisation step here — that's only for wide fronts with two drive units; you have one. Test: light touch opens; switch closes; BLUMOTION soft-closes. The collision safety stops the door if it meets a hand or object. Error signal? The 7805389 test jack helps diagnose.
Fit the SERVO-DRIVE cover caps from the 23K8000.NA-DG set over both mechanisms. The opening-angle screw is still reachable through the cap — Blum: “Adjustments can be made with the cap on.” Done.
Quick reference
Print this and pin it to the wall. If a dimension disagrees with the body of this guide, this table is the source of truth — pulled directly from Blum's "AVENTOS HK top – standard applications" PDF (MD-039/2 · 05.23), the 2019 technical manual, and the HK top FAQ.
Glossary
Blum's diagrams use German-derived shorthand. Throughout this guide these terms have a dotted underline — hover any of them for a one-line definition. Here's the full list.
Hardware reference
A bench reference for every part number used in this build. Hover any part chip in the steps above to preview its label; click to jump here for the full card. If you're going part-by-part down your kit before starting, this is your checklist.
What it is: Two symmetrical AVENTOS HK top lift mechanisms (left + right), eight #7 × 35 mm POZI wood screws, and an integrated positioning template. Power-factor range 270 – 781; opening angle 107° (adjustable down to 75° via the integrated stop).
How to use it: The mechanism's positioning template indexes off the cabinet's top-front corner and locates both screw positions automatically — no measuring. Drive 4 screws per mech (8 total). After fastening, push the setback template down to remove it; the arms then release. Keep the arms locked until the door is on — they're spring-loaded.
Used in Step 2 (mount). Tension is set in Step 5 with the T20, after the door is clipped on.
What it is: Two arm-assembly mounting plates that fix to the back of the door. The plates clip onto the lift mechanism's arms (CLIP system, no screws at the clip joint).
How to use it: Locate each plate's holes at SFA + 12.5 = 29.5 mm from the side of the door (SFA = 17 mm side overlay) and the first hole at 62 + FAo = 79 mm from the top (FAo = 17 mm top overlay), then 32 mm spacing. Fix with 4 × 606N or 606P screws per plate (8 total). Confirm the reference point against the standard-applications sheet's diagram before drilling.
Used in Step 3 (mount plates to door).
What it is: Blum's #7 × ~17 mm POZI wood screw for fixing the 20S4200 plates to a wood / MFC door. 606N is bright (steel); 606P is plated. Blum lists them separately from the 20S4200 set, so verify you have them.
How to use it: 4 screws per plate (8 total for 2 plates). Drive with POZI #2 — don't use Phillips. Pre-bore is optional with 65.1051.02.
Used in Step 3. SOURCE TODAY — not in your order.
What it is: The electric drive motor that opens the door when you push the front. Set includes the drive unit + 1500 mm distribution cable + connecting node + 2 cable end protectors.
How to use it: Clip onto the LEFT lift mechanism — tool-free, just a snap fit (Blum FAQ: “always mounted on top of the left AVENTOS mechanism”). Run the 1500 mm cable to the power supply via the connecting node. Self-commissions on first power-on (LED-guided).
Used in Step 9.
What it is: The cosmetic / interface kit for the SERVO-DRIVE setup. Includes left + right SERVO-DRIVE cover caps, two SERVO-DRIVE close switches, and two Ø5 mm distance bumpers.
How to use it: The 2 switches go in the 35 mm holes (one each side, Step 8). The 2 bumpers join your 993.1220 bumpers for Step 7. The cover caps snap on at the very end (Step 11). Don't snap the caps on until commissioning is done — they cover the drive unit's adjustment access.
What it is: The all-in-one transformer that powers SERVO-DRIVE. Houses + transformer + power cord in one unit, US plug (NEMA). One supply can run up to 16 drive units.
How to use it: Mount somewhere ventilated and serviceable — typically inside an adjacent cabinet or on a stud above the run, not stuffed against the back of the wall cabinet. Plug into a standard 120 V outlet. Wire the drive unit's distribution cable to it via the connecting node.
Used in Step 9.
What it is: Ø5 mm soft press-in buttons that sit between the back of the door and the cabinet face, holding the closed door 2 mm proud of the front edge. That 2 mm is the trigger path SERVO-DRIVE needs to detect a push and open.
How to use it: Press 2 bumpers into the back of the door (light doors like yours don't need more), spaced symmetrically near the bottom-outer corners. Combined with the 2 bumpers from 23K8000, you have plenty.
Used in Step 7.
What it is: A SERVO-DRIVE inline cable connector for joining cabling lengths. Same-generation only (Flex with Flex).
How to use it: Only needed if the drive unit's 1500 mm cable doesn't reach the power supply. Snap into the run between drive and supply.
Optional, Step 9.
What it is: Adhesive / screw-on clips for routing SERVO-DRIVE cabling neatly.
How to use it: Plan the cable route from drive unit → carcass pass-through → power supply before sticking. Space clips so the cable doesn't sag or chafe.
Used in Step 9.
What it is: Additional SERVO-DRIVE close switches (Dark Gray). HK top needs 2 switches per cabinet — one each side — and your 23K8000.NA-DG set already includes 2. These 2 are spares (or for a second cabinet).
How to use it: Hold for stock. Up to 6 switches per drive unit are supported by Blum, so if you ever add activation points, this is your inventory.
Not used in this build.
What it is: Blum's universal pre-boring template for AVENTOS lift-mechanism locating pins (and cabinet profile / BLUMOTION / TIP-ON adapter plate fixing points). Ships with a Ø2.5 stop collar and a Ø5 stop collar plus a calibrated scale.
How to use it on this job (Step 2 — mechanism mount):
Used in Step 2. Optional speed-up tip — the mechanism's own locating template also self-positions without pre-boring.
What it is: The dedicated boring template for the SERVO-DRIVE close switch's 35 mm press-in hole. Ships with the 35 mm Forstner bit and 2 Torx fixing bits. Works on HF / HS / HL / HK top.
How to use it on this job (Step 8 — switch holes):
Used in Step 8. This is the single biggest quality / speed win in the whole job — manual boring of a 35 mm hole is fiddly.
What it is: A small diagnostic jack that connects in line with the SERVO-DRIVE wiring so a technician can probe for fault signals during start-up.
How to use it: Only needed if commissioning throws an error pattern via the LEDs. Connect between the drive unit and its cabling; follow Blum's troubleshooting guide to interpret signals.
Optional, only in Step 10 if there's an issue. Backordered in your order — install can proceed without it.
What it is: The driver/bit used for every HK top adjustment — spring tension, 3-D door cams (height/side/depth), opening-angle stop. Blum lists a long-blade variant (210 mm) and a short stubby (35 mm) for in-place adjustments.
How to use it: A #2 × 2 TORX bit in a screw gun is what the manual calls out specifically for the tension screw — gives controlled adjustment under spring load. Hand-driver works for the 3-D cams and opening angle.
What it is: POZI screws look similar to Phillips but have extra tick marks at 45° between the cross arms. Blum mounting screws (606N/606P, #7 × 35) are POZI — driving them with a Phillips bit cams out and strips the head.
How to use it: Use a POZI #2 bit in your screw gun for every Blum-supplied wood screw. If you only have Phillips, buy a POZI #2 bit before starting.
What it is: POZI-head wood screws supplied with the 22K2900 set. 1-3/8" length, sized for fastening through the lift-mechanism flange into a 19 mm cabinet side panel without exiting.
How to use it: 4 per mechanism (8 total). Drive with POZI #2 to full torque — the mechanism flange has POZI-bottom recesses that need to seat. Don't substitute longer screws on a 19 mm side panel — they'll poke through.
Used in Step 2.
Watch
Reference