Record S20 SU is an underfloor linear sliding operator, R61 SU serves curved sliding entrances, and C127X is an in-ground swing operator. Concealing the drive below the floor does not make these systems interchangeable or remove every upper guide. Review leaf movement, support and guidance, floor construction and maintenance access together before selecting the proposed configuration.
Identify movement before the operator location
“Underfloor” identifies a drive location rather than a complete door type. A linear sliding entrance needs a parking region, a curved sliding entrance follows its curved layout, and a swing door moves around an axis. Their effects on the surrounding building space differ even when the operator is concealed.
The reviewed Australian Record pages identify S20 SU as an underfloor sliding operator and R61 SU as an underfloor curved sliding operator. Record documents C127X separately as a swing operator. These identities help locate the right documents; they do not establish a particular leaf weight, clear opening, controls version or configuration available for a project in China.
| Documented name | Movement | Information to establish first |
|---|---|---|
| S20 SU | Underfloor linear sliding | Leaf arrangement, passage, parking, support and guides |
| R61 SU | Underfloor curved sliding | Curved layout, measurement reference, parked positions and passage |
| C127X | In-ground swing | Axis, swept area, connections and floor-box position |
The historical STA16 should not be silently renamed S16 either; see legacy-model identification. This article does not rank S20 SU above S16 by traffic or capacity on the basis of its name.
Concealed drive does not mean absent guidance
“No conventional overhead operator pelmet” is different from “no upper guide.” Drive location, vertical support and control of horizontal movement are separate questions. An architectural image may communicate the desired appearance without showing the components needed to achieve it.
Page 11 of the official Record Curved Range leaflet describes a CURVED Special underfloor configuration in which the floor drive module carries the door weight and an upper guide bears horizontal wind-load forces. This is a documented example showing why concealed drive cannot be treated as proof that every upper component disappears.
That example is not a guide dimension or structural design for every R61 installation. Request the sections and connections applicable to the actual proposed system, identifying support, guidance, fixings and building interfaces. Where the visual requirement is a completely clear head, resolve that requirement against the proposed construction before ordering equipment.
A slim guide being unobtrusive from a viewing position does not establish that it is absent. Do not remove a guide or connection on site to match a visual interpretation of a rendering.
A radius needs a defined reference
A single radius value may still leave a curved layout ambiguous. Does it refer to the glass face, profile, track centreline or another reference? Is the entrance curved inward or outward? Where do the leaves park, and what passage remains in the open position?
Record building boundaries, curve reference and centre, endpoints, fixed and moving parts, finished surfaces and open/closed positions on the same layout. Distinguish radius, diameter, chordwise width and clear passage. A distance measured along an arc is not automatically the usable entrance width. The applicable drawings must resolve exact dimensions and combinations.
For a hypothetical document comparison, two sketches may show the same radius but refer respectively to an outer glass face and a track centreline. They may not describe the same installation position. Align the references before comparing arrangements and prices. This is an information-review example, not a customer project or a setting-out procedure.
The R61 SU listing identifies a product category; it does not approve an arbitrary architectural curve. Do not assemble a new R61 specification using values from standard, special and differently driven CURVED arrangements.
Coordinate the floor interfaces before construction
The proposed equipment cannot by itself establish what the building permits. Bring the door-system requirements, existing structure and underground services, finished floor, waterproofing and service access into the same interface record, with responsibility for each confirmation.
| Interface | Evidence to request | Statement that does not replace it |
|---|---|---|
| Drive and connections | Complete model, configuration, box and applicable installation drawings | “Any underfloor drive fits a similar recess” |
| Structure and services | Existing structure, utilities, heating and relevant site boundaries | A surface photograph proves cutting is acceptable |
| Finish and access cover | Finished datum, opening area, removal path and reinstatement | Lifting one stone will resolve every repair |
| Waterproofing and drainage | Building construction, equipment requirements and responsibilities | An equipment IP rating approves the entire floor detail |
| Power and functions | Applicable wiring, supply, control and protective-function documents | Another model's wiring diagram or a conduit count is sufficient |
| Handover | Installed configuration, checks, outstanding items and responsible replies | A moving leaf completes every review item |
This page does not prescribe a universal recess depth, level tolerance, drainage slope, outlet or cable position. Those details require the applicable installation documents and project construction arrangements. For an existing finished floor, also identify the impact of work on structure, waterproofing, services and ongoing access, rather than assuming it is included in “standard installation.”
Access covers are only part of maintainability
Review how a cover opens, how people and tools reach the equipment, how the relevant part can be removed, and how the floor finish and waterproofing can be reinstated. An opening cover answers only one of these questions. Furniture, fixed connections or later finishes may still prevent the required work.
Do not make a blanket promise that a failed underfloor system will never require floor work. The fault, box arrangement, component dimensions and site determine the intervention. Instead, request a defined access route and removable scope at design stage, and retain the relevant drawings at handover.
Use the actual equipment's applicable documents for maintenance intervals, cleaning materials, lubrication points and access permissions. Record symptoms and safely observable information when a fault arises. Do not pour water into a box to test protection or transfer another model's track or pivot lubrication instructions.
Separate equipment and site-work scope in the enquiry
List drive equipment, leaves and profiles, guides and connections, floor construction, waterproofing/drainage, access-cover finishes, electrical interfaces and handover documents separately. If two proposals retain different parts or include different construction and reinstatement, align their scopes before comparing a total labelled “underfloor entrance.”
The original blank underfloor site and interface worksheet records movement, measurement references, below-floor constraints, proposed configuration and unresolved responsibilities. It is not a manufacturer foundation drawing, construction approval or acceptance certificate.
Reviewed sources: Record's Australian S20 SU and R61 SU pages and page 11 of the Record Curved Range leaflet. Review date: 2 November 2026. Regional and configuration limits are retained; a product overview is not a site installation approval. For the separate swing arrangement, see C127X Center and Offset. Other sliding layouts are addressed in telescopic entrance space.
Business contact: 河南联同创智能科技有限公司, Mr Wang, +86 13271597000. Address: No. 11A1-16, South China City, Longhu Town, Xinzheng, Zhengzhou, Henan, China. Original address: 河南省郑州市新郑市龙湖镇华南城11A1-16号. Supply, site-work acceptance, timing and warranty responsibilities require project-specific confirmation. This English reference does not establish overseas installation or service coverage.
Frequently asked questions
Are S20 SU, R61 SU and C127X the same underfloor door?
No. The reviewed official sources identify linear sliding, curved sliding and swing forms respectively. Establish movement and surrounding space before selecting applicable documents; location below the floor does not establish interchangeability.
Does an underfloor sliding operator remove every upper guide?
No such assumption should be made. The official CURVED Special underfloor example retains an upper guide with a stated role. Drive location, weight support and horizontal guidance require the proposed configuration's drawings.
Is one radius value sufficient for an R61 enquiry?
No. State its measurement object, curve reference, direction, open/closed positions, required passage and building boundaries. Identical radius numbers with different references need not describe the same layout.
Can all underfloor operators use one recess depth and level tolerance?
No. This article provides no universal construction values. Use the proposed configuration's foundation and installation drawings alongside structure, services, finishes, waterproofing and responsibility review.
Does an access cover prove that future repairs need no floor work?
No. Review cover opening, access, component-removal paths and reinstatement. The required maintenance work depends on the fault and installed arrangement; define the boundaries in the project records.
What should an underfloor entrance quotation separate?
Equipment, door assembly, guides and connections, construction, waterproofing/drainage, service-access finishes, electrical interfaces and handover responsibilities. Confirm actual price, timing and warranty against the current defined project scope.
Reference only; official product information takes precedence. 内容仅供参考，以官网数据为准