Nucleus toplotne pumpe, Novi Sad
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Nucleus, Novi Sad
Nucleus toplotne pumpe, Novi Sad

• Nucleus heat pumps •

Nucleus toplotne pumpe, Novi Sad


Air to water heat pumps use air temperature from the environment as their source of energy which significantly decreases the installation costs. By using the most up-to-date technologies and types of refrigerants (HFO), our air to water pumps reach high coefficient of efficacy even at outdoor temperatures of -35⁰C. Every pump is able to heat, cool and, if constructed that way, it may also heat the warm sanitary water.

Working principle of AIR TO WATER heat pump

Every heat pump consists of 4 parts that represent the basis of the whole working principle and those are: Compressor, Evaporator, Condenser and an Expansion Valve.

  1. The low pressure and low temperature liquid refrigerant exits the expansion valve and takes over the temperature from the environment (heat source – water, air, brine…) via the heat exchanger (evaporator) which causes the evaporation, and the refrigerant converts from liquid to gas. The prerequisite for this process is that environment temperature (heat source) is higher than the temperature of the refrigerant since otherwise the heat takeover would not take place as well as the evaporation.

  2. The compressor sucks in the gas (vapour) phase of the refrigerant from the evaporator and compresses (condenses) the gas to high pressure and high temperature.

  3. The gas under high pressure and temperature transfers its heat energy from the compressor to a colder medium for heat transfer (ex. water, glycol for heating…) via the heat exchanger (condenser) which causes it to condense and return to liquid state.

  4. After the condenser, the refrigerant reaches the expansion valve whose task is to lower the pressure and the temperature of the refrigerant below the temperature of the heat source so that the cycle may be repeated.

Models and Components

NUCLEUS air heat pumps are delivered as functionally ready for operation, and are regularly produced with the power range of 8-22kW in 4 capacities, and if needed and upon the request, they may be produced in bigger power range as well as capacities.

All NUCLEUS air heat pumps consist of the following components:

Controller V520B
Scroll compressor (Danfoss)
Plate exchanger for the condenser (or evaporator in the active cooling regime - Alfa Laval)
Lamella exchanger made of Al/Cu pipes for the evaporator (or for condenser in the active cooling regime)
Radial EC fan with spin regulator
Reservoir and drier filter for the refrigerant (Danfoss)
Melt regulator integrated into the controller
4-way diverter valve (Danfoss)
Electrical expansion valve (Carel)
Display NSD20 (touch sensitive, with option to be installed in room)
Modem for remote control via mobile phone application (option)
Pressure sensors on primary and secondary sides (Carel)
Flow indicator on secondary side
Sight glass for the refrigerant (Danfoss)
Integrated electric heater
Circulating pump system sides (EuP Grundfos EEI = 0.23)
Asymmetric phase relay
Solid metal housing; sound-heat-fire isolated.
2 pipe fittings (3 fittings with DHC model)

Technical Details
Installation and Use Instructions

Nucleus toplotne pumpe, Novi Sad



Wide use, reliable and silent work, simple installation, handling and servicing.



Saves your money. Most efficient and environmentally friendly way of heating and cooling, not only the premises but sanitary water as well.



Environmental awareness, using natural, inexhaustible sources of energy.



Highly efficient heating and cooling regime from -35˚C to + 43˚C.


The Company Nucleus Energy d.o.o. was founded with a goal to contribute to the development and production of heat pumps. More than 30 years of experience in production of heat pumps with the new technologies of the present, will ensure the most efficient way of heating and cooling. Besides the comfort, efficient heating and low exploitation cots, what the heat pump also provides you with is extremely economical cooling during the summer.

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