Qvantum RSe


Liquid/Water 27–96 kW

  • High efficiency
  • Refrigerant R-513A
  • Compact design
  • Flexible installation

For more info – contact sales on phone: +46 10 332 00 54 or mail: sales@qvantum.com

Qvantum RSe
Qvantum – All in One


Top range COP and high capacity throughout the envelope

Qvantum QCloud


Flexible installation of outdoor unit in noise sensitive areas

Qvantum QCloud


We offer quality support throughout the product life cycle

Qvantum RSe

Qvantum RSe
Heat pumps with refrigerant R-513A

Qvantum RSe is intended for use in systems where the brine consists of a mixture of water and antifreeze (e.g. surface soil heating systems, geothermal heating systems, sea water systems, exhaust air system).


Qvantum RSe is equipped with the Qvantum QLC control system as standard. QLC stands for Qvantum Logic Controller. The unit is controlled and operated via the principal of liquid condensation or solid/half solid condensation. All control parameters such as outdoor temperature compensated set-point curve for supply, hot water temperature, auxiliary heat, are set via the self- instructing control system. Required protection and safety functions are available in QLC control systems.

The system is managed via a 5,7″ panel mounted in the heat pump. All parameters can be set via the panel. The panel displays a dynamic flow diagram with all temperatures and operating modes measured and controlled. The QLC system also logs temperatures and events, facilitating set- up and analysis. The system communicates via Modbus. Modbus TCP is standard. The system also has a web server which allows the QLC system to communicate with a web browser on a PC or smartphone (app may be needed).

Qvantum LB4 heat pumps are equipped with both vapor injection and liquid injection where it mainly operates with V.I.P. which means that the generated heat output capacity increases at the same time as the coefficient of performance, COP, also increases. The gas temperature is lowered during the compression process, which means that a higher supply temperature can be achieved.

As an option, the unit can be equipped with an extended display that allows for dynamic flow images and extended network functionality.




The temperature to the heating system is controlled according to the selected outdoor temperature compensated curve. Hot water preparation, if such a function is required, takes place via a switching valve that momentarily raises the temperature in the water heater to the set point as a priority.

In bivalent systems, the control system switches on additional heat when needed and after a time delay. The auxiliary heat can be chosen to “take over” the hot water preparation as a first step and thus release power from the heat pump to the heating system.

The Qvantum control system can control up to 8 heat pumps in sequence with automatic operating time equalization between the different heat pumps. The control system is configured at commissioning depending on the selected system solution and the type and number of heat pumps.

The heat pump/control system can be configured for control via an overlaying external control system if required. Set points can be changed via Modbus so that the controller’s regulators are set by the master controller. It is also possible to configure the system so that the heat pump is fully controlled by the master system. In this case, the heat pump control system is used only for alarm and protection functions.

E.g., Temperatures readable via Modbus *)
1: Heat pump heat carrier – in
2: Heat pump heat carrier – out
3: Heat pump hot gas temperature
4: Heat pump brine – in
5: Heat pump brine – out
6: Radiator circuit supply
7: Outdoor temperature
*) Modbus description for complete information

All relay outputs are also readable. It is thus possible to transmit the operating status of compressors, pumps, fans, etc. controlled by the heat pump.

Set points for hot water temperature and control curve for radiator circuit can be read and adjusted. From the expansion valve control unit, the current evaporating temperature, pressure,
overheating, the degree of opening of the expansion valve can be monitored via Modbus.

Qvantum RSe heat pumps are equipped with electronic expansion valve. The expansion valve have its own electronic control unit with display that shows, evaporation pressure, temperature, overheating, etc. for the circuit. Via Modbus, these variables can be transferred to an overlaying control system.

QVANTUM RSe: Principal layout showing the refrigerant circuit.

Principal layout showing the refrigerant circuit.

Electronic Expansion Valve

Qvantum RSe heat pumps are equipped with electronic expansion valve. The expansion valve have its own electronic control unit with display that shows, evaporation pressure, temperature, overheating, etc. for the circuit. Via Modbus, these variables can be transferred to an overlaying control system.
Fig 2. Principal layout showing the refrigerant circuit.


All Qvantum RSe heat pumps have R-513A refrigerant (GWP=573, AR5).

Brine Circuit

Qvantum RSe heat pumps are configured for brine with antifreeze, e.g. bioethanol.

Pipe connections

Q32-41RSe has top connections. See drawing Q-RSe- 32-41-001.
Q48-81RSe has back connections. See drawings Q- RSe-48-001 and Q-RSe-65-81-001.


The unit is built on a robust stand of galvanized square tubes and covered with an effective sound- absorbing casing, consisting of powder-coated plates with sound-absorbing material on the inside. The top plate is made of patterned aluminum. The top and bottom are also covered with sound-absorbing material. The stand rests on adjustable rubber feet.


The unit is constructed so that all components inside the heat pump are easily available by removing the cover plates, both for maintenance and replacement.


The following options are available:

  • Connecting QLC to network.
  • Electrical cabinet mounted on the left side of the unit, seen from the front (applies to Q65-81RSe)
  • – Hot gas heat exchanger
  • Reversible function.


All units are equipped with fully hermetic scroll compressors, 3-phase 400V.

Q32RSe till Q48RSe are equipped with 2 compressors.

Q65RSe till Q81RSe are equipped with 3 compressors.

Cooling circuit
All units are equipped with 1 cooling circuit.

Heat exchanger

  • The evaporator is a stainless steel, brazed plate heat exchanger, insulated with Armaflex insulation.
  • The condenser is a stainless steel, brazed plate heat exchanger.
  • The hot gas heat exchanger (option) is a stainless steel, brazed plate heat exchanger.

Refrigerant circuit

  • Drying filter
  • Sight glass with moisture indicator
  • Electronic expansion valve, pressure transmitter,
    control equipment with display (Modbus) for the
    main circuit
  • High- and low-pressure switch, manual reset
  • Service valves for pressure measurement
  • Rotalock valves
  • Pressure protection equipment, high and low pressure


The units are test run and calibrated under design conditions using ClimaCheck.