KONE Machine Room-Less Elevator: A Quality Inspector's Installation Checklist

When You Need This KONE Machine Room-Less Elevator Checklist

This checklist is for project managers, general contractors, and building owners who are planning a KONE machine room-less elevator installation. I use it when I review the building-side work before the equipment arrives. It's not a replacement for the supplier's layout drawings or a local code review. It's a second pair of eyes.

When I first started inspecting machine room-less elevators, I assumed 'machine room-less' meant fewer things to check. It doesn't. The motor and controller move into the hoistway or a locked cabinet, but the building still has to provide shaft clearances, pit access, electrical service, and maintenance space. The review points change, not the responsibility.

Step 1: Verify the Shaft Data Before You Trust the Drawing

The most expensive problem I've seen is a shaft dimension that is 30 mm or 150 mm off the architectural drawing. It always shows up after the guide rails have been delivered. Before you order, measure the actual hoistway, not just the dimensions on the plan. In a Q1 2024 quality audit, we rejected a delivery because the shaft was 50 mm narrower at the fifth floor than at the first. The KONE layout still worked, but only because we caught it during the survey and changed the rail bracket spacing.

Check these numbers on site:

• Actual hoistway width and depth at every landing, not just the ground floor.
• Wall plumbness and final surface conditions.
• Pit depth, pit access, and the required ladder or steps.
• Headroom above the top landing.

This is the step people want to skip because it's slow. It's also the step that saves you from a change order later.

Step 2: Check the Hoistway Clearances and Travel Path

Machine room-less elevators use a compact machine above or beside the car, so the overhead dimensions matter. If the overhead is short, you might need a different machine configuration or a relocated hoistway. The manufacturer's layout will specify minimum clearances. These aren't suggestions; they're tied to ASME A17.1 and the local code having jurisdiction in your area.

One thing I've stopped doing is assuming the shaft is empty. It's surprising how often ductwork, fire sprinkler pipes, or a valve stem from a sprinkler system pokes into the hoistway. If it's in the way, it has to move before the rail installation starts.

Step 3: Inspect the Overhead, Pit, and Landing Conditions

The pit is where I find the most heartbreaking mistakes. A concrete floor gets cast one week early, and suddenly the pit is 75 mm too shallow for the buffer stroke. The elevator cannot be released until that's fixed. This is not a field adjustment.

At the top of the shaft, look for the working space required for the machine and the car-top inspection station. On a machine room-less elevator, the maintenance technician needs enough space to reach the machine without crawling into a 400 mm gap. If the layout drawing shows a 600 mm clearance, the contractor should not build the wall at 580 mm.

Also check the landing doors for the smoke and fire rating required by the building code. If you're replacing glass in an elevator lobby door, this is not the same as ordering a standard window pane. The glass has to meet the same fire-resistance and impact requirement as the door assembly.

Step 4: Confirm the Controller Location and Access

The controller for a KONE machine room-less elevator is usually in the hoistway or in a locked cabinet near the top landing. It still needs clear working space, lighting, and a reliable power supply. I've seen a controller mounted in a space where the panel door couldn't open all the way. Technically, the door was accessible. In practice, no one could work on it.

Confirm the electrical characteristics early: voltage, phase, frequency, and available fault current. Voltage drops under load cause more controller faults than most people expect.

Step 5: Choose the Door Opening and Cab Finish Package

Door opening width is both a functional and a code issue. If the building needs to move hospital beds or large equipment through the elevator, a 900 mm door won't work no matter how good the elevator system is. Review the door size, the hall fixture placement, and the door operator side before the hoistway walls are framed.

For cab finishes, stick to the manufacturer's options or get written approval for compatible materials. A building owner once asked me where to buy Benjamin Moore paint for touch-up work on an elevator cab. The honest answer: you don't. An elevator cab finish has to match the supplied finish and the fire/smoke classification, not a retail paint fan deck. Use the paint code from KONE's finish schedule instead.

Step 6: Set the Guide Rail and Machine Beam Schedule Before Pouring Anything

This is the step that sounds like it belongs to the elevator contractor only, but the building schedule is involved. Guide rail brackets and the machine beam need to be anchored to the structure. If you wait until after the shaft walls are finished, you'll be chipping concrete or adding steel just to support the brackets.

A contractor once told me the rail brackets didn't need to be set until the shaft was finished. That's backwards. For a KONE machine room-less elevator, the rail bracket spacing and machine beam position are part of the structural coordination. Confirm the concrete embed type, the bracket spacing, and the tolerance before the formwork is closed.

Step 7: Coordinate the Acceptance Test with the Local Inspector

Don't assume the local inspector will accept the same documentation you used on the last project. Some jurisdictions want a copy of the ASME A17.1 conformance letter; others want the full test log from the installer. Check before the elevator is delivered. Don't hold me to every local variation, but ASME A17.1 is the baseline that most U.S. jurisdictions I've worked with reference. If your project is outside North America, verify the EN 81-20 requirements and any national deviations before you order the hoistway doors.

In my experience, the best-run projects have the inspector on site during the load test and safety-device verification, not just at the end. That gives the technician time to fix a minor adjustment without turning the final inspection into a punch-list item.

Common Mistakes That Still Show Up

The most frustrating part of this work is that the same issues recur despite clear instructions. Here are the ones I still see on new projects:

• Treating the shaft drawing as final when the actual dimensions have drifted by 20 mm or more.
• Letting other trades store materials in the hoistway during installation. A scaffold board or a pipe wrench can wreck a car top or a door operator.
• Skipping the electrical survey and finding out about voltage drop only during the first load test.
• Using retail paint or touch-up materials that don't meet the elevator's finish requirements.
• Assuming that a machine room-less elevator doesn't need maintenance access. It does. The machine is just in a different place.

To be fair, the machine room-less format saves a floor of rentable space and gives architects more planning freedom. That doesn't mean the building side can be treated as an afterthought. Verify the shaft, respect the clearances, and bring the inspector in early. That's the whole checklist.