The HYDRA heat pump units are particularly suitable for applications using radiant panel heating systems or low temperature applications such as suitably dimensioned fan-coil, thermal ventilation and AHUs for delivery temperatures of 50°C. All versions are fitted with noiseless EC axial fans and with Twin Rotary inverter compressors that allow complete power management of each individual component. In fact, the compressor, fan and circulators are continuously regulated by a programmed control unit with an internally developed control logic. It has been designed to be intuitive immediately usable; this allows the unit to be inserted into a large number of system configurations.
The 4-pipe units can control a high and low temperature circuit simultaneously.
The speed of the compressor, fan and circulators is continuously regulated by the control unit.
The DURAN units are characterised by high efficiency and the integrated management of the circulator that allows high temperature water to be produced via a heat exchanger specific for DHW production.
On the system side heat exchanger the unit is able to produce hot or cold water to meet the building's seasonal heating and cooling requirements.
On the heat exchanger for the production of domestic hot water, the unit produces high temperature water to send to an external storage tank, which has been chosen and sized according to the requirements of the system.
The unit operates in a different way according to the season:
The system switches between the various operating modes (within a season) automatically by reading the temperature probes and the programmed set points. Switching times and logics are designed to ensure maximum system efficiency and reliability.
This configuration must be associated with a suitably sized boiler in which to store the high temperature water. The upper part of the boiler must be fitted with a thermowell in which to insert the hot water probe, through which the unit controller monitors whether hot water has to be produced.
There are three summer operating modes:
- Chiller mode
The unit produces only chilled water for the cooling system.
- Chiller mode with the simultaneous production of domestic hot water
The unit produces chilled water for the cooling system and domestic hot water at the same time. Full power is recovered for the production of domestic hot water.
- Heat pump mode for the production of domestic hot water
If there is no cold load, and on request by the hot water probe, the unit heats the water in the water storage tank using the finned pack coil as an evaporator. The use of warm outside air as a heat source guarantees extremely high COP levels.
There are three winter operating modes:
- Heat pump mode for heating
The unit produces hot water at the system side heat exchanger for heating.
- Heat pump mode for domestic hot water
High temperature hot water is produced at the heat exchanger connected to the domestic hot water storage tank.
- Heat pump mode with the simultaneous production of domestic hot water
DHW is produced at the same time as hot water for the heating system by desuperheating the gas R410a while maintaining a high COP.
Automatic Seasonal Adjustment
The system switches automatically between the various operating modes according to a priority logic for the production of domestic hot water and, when there is loading at the same time, recovering condensation energy for the production of hot water. .
Split air-water heat pump: the outdoor unit is equipped with an EC axial fan and BLDC Twin Rotary Inverter compressor, and features a cutting-edge design and high COP.
The heat source is the outside air down to a minimum of - 20°C. Low noise is guaranteed by an intelligent control system that regulates the speed of the compressor and fan according to actual requirements. In addition, the use of anti-vibration mountings for the compressor and multi-layer noise insulation on the casing mean that noise is reduced to a minimum.
The refrigerant gas used is R410a. Cooling circuit with very high efficiency twin rotary inverter compressor. Pressure transducers and safety pressure switch. Stainless steel plate desuperheating exchanger and plate heat exchanger for evaporation / condensation. Copper-aluminium finned pack evaporator with special hydrophilic treated finning.
Dual defrost system by way of hot gas injection and/or reverse cycle.
The source side heat exchangers are made of copper pipes and aluminium fins coated with hydrophilic paint that encourages water run-off. The user side braze-welded stainless steel plate exchanger allows the amount of refrigerant gas to be reduced to the minimum and maximise the efficiency due to the large heat exchange surface.
The brushless EC axial fan has been designed to reduce noise to a minimum and to maximise efficiency. The speed of rotation is continuously regulated by the control unit.
Control and protection
Carel electronic control with integrated inverter driver control combined with the compressor, pump and fan modulation. Climate logic management. Standard ModBUS communication protocol.
The unit is equipped with a series of alarms designed to protect it from faults. These are managed entirely by the control unit that makes them available and accessible. It is also possible to access the controller via the control unit if you need to make any adjustments.
V-Color remote controller (optional)
The control unit consists of Evco hardware and can be combined with a highly intuitive touch-screen controller with which all the operating parameters, set points and usage settings can be controlled. The controller allows direct connection to the heating system with or without a storage tank, or more commonly, by connecting the latter to the heating system at two or four points. The storage tank is charged at a set point for DHW and with a heating or cooling curve for heating / cooling circuit.
All units are fully assembled and wired. They are inspected to high standards, undergo leak and vacuum cycle tests, and are filled with an eco-friendly refrigerant. They undergo a complete functional test before being delivered. All units comply with European Directives and have a CE marking and relative certificate of conformity.
* Energy efficiency class for low temperature (35°C) heating applications under "average" climatic conditions
** Energy efficiency class for medium temperature (55°C) heating applications under "average" climatic conditions