NaviPad touchscreen

HTML5-based intuitive UI on a flat colour touchscreen, connected via 3 m flat cable. Mounts on the unit or on the wall — easy to detach for handheld use during commissioning. Real-time operating data, settable per project, custom labels for unit/alarms/components.

Modbus RTU + RS-485

Standard on every unit. Serial bus integration with BMS systems via Modbus protocol — typical for office, school and retail fit-outs where ventilation needs to coordinate with heating, lighting, and access control.

BACnet/IP + TCP/IP

BACnet over IP standard — the protocol most commercial BMS systems prefer. Plus direct TCP/IP web server access for browser-based monitoring without additional software. Multi-device monitoring across a local network of Topvex AHUs from one dashboard.

CAV / VAV airflow control

Constant Air Volume standard — fans hold a fixed airflow regardless of filter condition. Variable Air Volume optional — constant duct pressure control, useful where downstream zone dampers vary the building's actual demand (multi-room offices, schools with varied occupancy patterns).

Free cooling + cool recovery

Built-in energy-saving features: when outdoor air is cooler than indoor on a summer evening, free cooling pulls outdoor air directly through. Cool recovery uses the rotor in reverse — recovering coolness from extract on hot days when outdoor air is warmer than the conditioned space.

Pressure-based filter monitoring

Filter status detected by pressure transmitters with airflow-adjusted setpoint — not a simple time-based timer. Means the controller flags filter change exactly when needed, not on an arbitrary schedule. Useful for variable-occupancy buildings where filter loading rate varies.

Sensor inputs (CO₂ / humidity / temp)

Multiple analog and digital inputs for external sensors. CO₂-driven control standard for occupancy zones; humidity for changing-rooms or kitchens; temperature for night setback, free cooling activation, and frost protection on hot water coil systems.

External electrical cabinet

Topvex FR has a separate electrical cabinet with all cable connections collected at one place — facilitates commissioning and service without opening the AHU itself. RJ-45 quick connector for the NaviPad and external HMI.

FR40-R configuration

3,150 m³/h supply + extract @ 115 Pa. R-hand variant. Single-phase 230V, 16A, 2.75 kW. F7 supply + M5 extract. 77.5% heat recovery (EN 308). 357 kg. C5 corrosion class. Article 473643. £15,600 ex VAT equipment package.

Adjust airflow up — FR60+

For larger commercial scopes (4,500 m³/h+) — large offices, supermarkets, light industrial halls, large fitness centres, school halls. Topvex FR60 and above. Three-phase 400V required. POA — sized to project brief, lead times 6–8 weeks.

Adjust airflow down — FR03 to FR11

For smaller commercial scopes — small offices, single classrooms, retail, daycare rooms, small fitness studios. Legacy compact sizes FR03 (240–800 m³/h) through FR11 (1,500–4,800 m³/h). Quote on request.

L or R hand variant

R (Right) on this configuration — refers to which side the supply air emerges from when viewed from the access side. L variant available for opposite-hand layouts. Selected from building services drawings; affects duct connection geometry, not performance.

Heater options

No integrated reheater on the FR40-R base configuration. Optional add-ons: EL (electric reheater), HWL (Hot Water Low power coil), HWH (Hot Water High power coil) — for buildings with heat pump or boiler hot water available. Or add downstream coil from a separate supply.

CAV or VAV airflow control

CAV (Constant Air Volume) cascaded extract control on this FR40-R configuration. VAV (Variable Air Volume with constant duct pressure) optional — better for buildings with zone dampers and varied occupancy patterns. Selected at order, not field-changeable.

Cooling coil add-on

Downstream water (CWK / PGK series) or DX (DXRE series) cooling coils available for active summer cooling. Fed from chilled water (heat pump) or refrigerant. Specified at design stage based on building's cooling strategy.

Acoustic silencers

Required for occupied office, school, retail, healthcare and fitness scopes per BB93 / BS 8233 acoustic standards. Silencers fitted on supply and extract sides reduce duct-borne noise to occupied-space targets. Specified per project — not included in base equipment.

2-year manufacturer warranty

Systemair provides a 2-year manufacturer warranty on the unit as standard. Built to Eurovent certification, EN 1886 casing performance, and full ErP compliance. Mature platform — Topvex FR has been Systemair's flat compact AHU range for over a decade.

Pressure-based filter monitoring

F7 + M5 filters changed when pressure transmitters indicate (not on a fixed timer). Typically every 6–12 months depending on outdoor air quality and occupancy density. Filter sets sized to unit; replacement filter pricing scales with unit size — quote on request.

Removable dual rotors

Both heat exchangers lift out from the front for cleaning every 3 years (or sooner if airflow performance drops). Wash in hot soapy water (no ammonia detergents). Rotor weight: FR03 31 kg, FR06 43 kg, FR08 55 kg, FR11 ~75 kg — two-person lift on the larger sizes.

Drive belt — replaceable

A rubber drive belt rotates each heat exchanger via the rotor motor. The controller flags an alarm if the belt slips or breaks. Replacement straightforward — Systemair supplies belts as service spares. Plan for one belt change per rotor in a 10-year service life.

Two large inspection doors

Full service access from the front — main components (rotors, fans, filters, heater) all reachable without dismantling adjacent ductwork. Doors open with a 16 mm key (supplied with unit). Sliding door kit available as accessory for false-ceiling installs.

CleverBloom commercial service plan

For office, school, retail, and HMO clients, CleverBloom offers scheduled service contracts: filter changes, rotor inspection, flow rate verification with calibrated anemometer, sensor recalibration, and BMS handshake testing. Quoted per project based on building size and access.