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Rotenso Airmi – Air/Water heat pump

All-season comfort: heating in winter, cooling in summer. Inverter-controlled twin-rotary compressor, two control zones, legionella protection program, and Wi-Fi control.

Consultation & quick quote Technical specifications

Models 4–16 kW
Heating & Cooling
2 zones + heating lines
Legionella disinfection
R32

Why Airmi?

High efficiency due to DC inverter twin-rotary compressor technology.
All-season : active cooling + efficient heating; wide operating range.
Flexible control with heating curves and two control zones .
Hygiene : automatic legionella program for tap water.
Ease of use : wired controller with weekly programs and Wi-Fi control.

Models & capacities

The Airmi line includes models ranging from 4 to 16 kW (single-phase and three-phase, depending on the model). A concise overview is provided below:

Model code (example)	Nominal power	Phase
AIM/W/B/G/40X1	4 kW	1-phase
AIM/W/B/G/60X1	6 kW	1-phase
AIM/W/B/G/80X1	8 kW	1-phase
AIM/W/B/G/100X1	10 kW	1-phase
AIM/W/B/G/120X3	12 kW	3-phase
AIM/W/B/G/140X3	14 kW	3-phase
AIM/W/B/G/160X3	16 kW	3-phase

Exact label values (A7/W35, SCOP, etc.) may vary per submodel; please ask us for advice.

Applications

Houses: terraced house, semi-detached house, detached house, apartment.
Small utility: office, shop, catering.
Replacement of central heating boiler (all-electric) or as a hybrid solution.
Output: underfloor heating, low-temperature radiators, fan coils.

Operation in brief

The outdoor unit extracts heat from the outside air and transfers it to the water circuit via the plate heat exchanger. In cooling mode, the circuit is reversed via the 4-way valve. The inverter regulates the compressor speed based on heat demand and water temperature. Defrost occurs automatically; during the legionella program, the boiler tank is thermally disinfected.

Heating/DHW circuit (simplified)

Compressor → air exchanger (evaporation) → EEV → water exchanger (condensation) → 4-way valve.
Sensors (including T3/T4/T5/TA/TB/TP/TH) control EEV, fan, compressor and defrost.
Start logic with start-up delay and phased speed build-up for stability.

Cooling/defrosting operation

4-way valve reverses the flow direction; air exchanger condenses, water exchanger evaporates.
Defrost: EEV fully open, 4-way valve turned on, fan off; runtime depends on conditions.

Key components

DC inverter compressor (twin-rotary)
Electronic expansion valve (EEV)
4-way valve (heat/cool switching)
Plate heat exchanger (water side) + air heat exchanger
Integrated pump (variable speed)
Expandable with electric element (backup/antifreeze)
Expansion vessel, safety valve, flow switch, pressure/temperature sensors

Regulation & business logic

Standby : pumps can run continuously; crankcase heater active at low outside temperatures.
Startup : 3-min safety delay; fan starts 10 s before compressor and builds up.
Normal operation : speed control based on inlet/outlet water and outside temperature; EEV in 0–480 steps.
Special functions : automatic oil return (at long low speed), automatic defrost.
Antifreeze : electric tracing/boiler heater switches on at low water/outside temperature (standby).

Security (practical)

Low/high pressure monitoring with controlled restart.
Limitation on compressor discharge temperature.
Fan feedback monitoring; error blocking on repetition.
Waterside protection via flow switch and frost logic.
Extended fault codes via controller for quick diagnosis.

Complete fault log available for service; see manual.

Frequently Asked Questions

Can the Airmi also actively cool?

Yes. The 4-way valve switches the system to cooling mode; the controls and safety features remain active.

Do I need a buffer tank?

Depending on zones, valves, and system volume. The recommended system volume is approximately 17 L/kW. We recommend this during the consultation for stability and sound comfort.

Is a legionella program in place?

Yes, periodic thermal disinfection of the boiler tank can be scheduled via the controller.

Is Wi-Fi control possible?

Yes, the wired controller can be paired with Wi-Fi for monitoring and remote control.

Technical specifications (summary)

Range & power

Power: 4 / 6 / 8 / 10 / 12 / 14 / 16 kW
Power supply: 1-phase (4–10 kW), 3-phase (12–16 kW)
Refrigerant: R32

Hydraulic

Built-in variable pump + flow switch
Expansion vessel (5 L) & safety valve (3 bar)
Boiler disinfection (legionella)

Regulation & safety

Compressor start-up delay (~3 min)
EEV 0–480 steps; multi-speed fan
Anti-freeze heater water exchanger at low T°
Low/high pressure and over temperature protection
Sensors include: TH/TP/T3/T4/T5/TA/TB/TW

Complete wiring diagrams, boundaries and fault code tables available on request.

Consultation & Quick quote

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Rotenso Airmi Monobloc Air/Water Heat Pump B/G/W 8/10/12/14/16 kW