Reversible Air-to-Water Heat Pumps/Chillers
ESTIA
Nominal heating capacity : 8-14 kW
Nominal cooling capacity : 3-16 kW
New, reversible air-to-water split system heat pumps with built-in inverter technology shall
be designed for residential and light commercial applications. System shall offer excellent
energy efficiency values, exceptionally quiet operation and meet the most stringent
operating temperature demands.
The units shall integrate the latest technological innovations like ozone-friendly refrigerant
R410A, DC inverter twin-rotary compressors, low-noise fan and microprocessor control and
they shall have exceptional energy efficiency values in order to be qualified for local tax
reductions and incentive plans in all EU countries.
The air-to-water heat pump shall use air as natural heat-source of the environment, to
produce heating and domestic hot water but also cooling with extremely low cost and using
renewable energy of ambient air.
The air-to-water heat pump shall be designed as a split system and shall consist of an
outdoor unit (condensing unit) and a Hydro-Unit inside. At the Hydro-Unit all applications
which are supported through the system shall be connected i.e. warm water tanks,
radiators, floor heating, etc.
The heat pump split system shall be specifically designed for ease-of installation and service
and with highest product quality and reliability.
Heat pumps shall be flexible to combine operation with already existing, conventional
heating systems (oil, gas, pellets etc.), as well as provide a convenient cooling during
summertime by the installation of “fan coils”.
The outdoor unit
-Advanced technology DC inverter twin-rotary compressor which shall provide maximum
energy-efficiency with high capacity available at peak conditions and optimised efficiency at
low and mid compressor speeds. The heat pump DC inverter system shall use Intelligent
Power Drive Unit (IPDU) hybrid inverter technology, combining two electronic management
logics: Pulse Amplitude Modulation (PAM) and Pulse Width Modulation (PWM) for
optimised compressor operation in all conditions, minimised temperature fluctuations, and
providing perfect individual comfort control with significantly reduced energy consumption:
- PAM: pulse amplitude modulation of the direct current shall control the compressor at
maximum load conditions (start-up and peak load), increasing the voltage at fixed frequency.
The compressor shall work at high speed to rapidly achieve the desired temperature.
- PWM: pulse width modulation of the direct current shall control the compressor at partial
load conditions, adjusting the frequency at fixed voltage. The compressor speed shall be
fine-tuned and the system shall provide high-level comfort (no temperature fluctuations) at
exceptionally efficient working conditions.
-Compressor frequency shall be increased continuously up to the maximum level. This shall
ensure that there are no current draw peaks in the start-up phase and safe connection to a
single phase power supply even in large-capacity systems. Inverter ramp-up speed shall
make soft starts unnecessary and ensure immediate maximum power.
-The two rotary compression cylinders, shall offset from each other by 180°, and the DC
brushless motor with the shaft in perfect balance shall ensure reduced vibration and noise,
even at very low operating speeds. This shall obtain an extremely wide range between
minimum and maximum capacity with continuous operation, guaranteeing that the system
shall be always optimised and shall provide maximum comfort at exceptionally high
efficiency levels.
-Twin-rotary cylinders, low vibrations and low load to the shaft shall ensure highest
compressor reliability and a long trouble-free operating life. All DC brushless twin-rotary
compressors shall be equipped with crankcase heaters as standard.
-A double compressor shield for acoustic insulation further shall reduce noise levels.
-Night mode operation at reduced compressor speed, shall result in low-noise operation and
a significant reduction in energy consumption.
-Easy-to-set and economical silent mode, shall reduce the compressor speed. The outdoor
unit shall be equipped with twin rotary compressor to provide silent operation. Two rotating
disks inside the compression chamber shall pump the refrigerant, vibration free and reliable.
Unit shall be supported by speed controlled DC-fan motors with large surface propellers
providing silent air-flow. Additionally start & stop times for a night-mode shall be set. The
-An intelligent control system shall be responsible for high efficiency ratios, thus for savings
on energy consumption. At full-load mode heat pumps shall reach an efficiency ratio of up to
4.66 (COP) and at part-load conditions even higher.
- The pulse modulation valve shall be a bi-flow electronic expansion device which optimizes
the refrigerant amount in the circuit and the superheat, preventing refrigerant migration
back into the compressor. This device shall further enhance high system performance and
reliability.
- The air management system shall consist of the propeller fan, orifice and air discharge grille
in order to guarantee minimized noise levels.
-Due to extensive piping options, the compact outdoor unit can be placed anywhere outside
the house or on a balcony. The installation shall be arranged flexible, as the refrigeration
pipes between the outdoor unit and the Hydro-Unit shall be up to 30 m in length.
-The temperature range during heating mode shall be between -20°C and +25°C, during
cooling mode between +10°C and +43°C and for the hot water generation between -20°C
and +43°C.
2-zone temperature control
Two zone temperature control including night-setback shall enable system to maintain two
different temperature zones, such as radiators or fan-coils (high temperature) and floorheating (low temperature).
The water leaving temperature shall be controlled by ambient temperature and system shall
control the ambient performance curves so as to be adjusted for each zone and building
requirements.
Depending on the configuration, night setback may be useful in the zones with radiators.
Unit control shall enable precise settings of the difference to the daytime temperatures
(Programmable start/stop times as well as target temperatures for each zone).
Hydro-Unit
The Hydro-Unit shall be the indoor part of the system where the “by the outdoor unit”
obtained heat will be transferred from refrigerant to water by a plate heat-exchanger, so as
hot water up to 55°C can be produced.
Further contained into the Hydro-Unit shall be: circulation pump, expansion vessel, remote
control and electrical support heaters.
The integrated regulation shall control all valves, pumps and system components and shall
allow optionally also the activation of any existing, conventional heating system, which for
example could be activated during low ambient temperatures. If required the air-to-water
heat pump can also be activated through an existing heating system.
Control of 2 water pumps
The hydro indoor unit shall control its main water pump and one external pump. Either a
boost-pump for very long pipe-runs or a water pump for a second heating circuit.
Hot water tank
Stainless steel hot water tank shall be manufactured with thermal isolation and equipped
with a largely dimensioned heat-exchanger, perfectly suited for the usage with air to water
heat-pumps.
This heat exchanger shall be optimally designed for best heat transfer from the 55°C
circulation water to the stored water. The tank shall also be equipped with electrical boost
heater, temperature sensors and a safety thermostat.
System Controls
Remote control shall be integrated in the Hydro-Unit and regulate all functions of the air-towater heat pump.
A large, easy readable LCD-Display shall display the current operation status. The integrated
7-day timer shall allow a comfortable switching of the system and the creation of requested
weekly programs designed by the owner. Useful functions such as night setback, frost
protection, hot water boost and anti-bacteria function shall be included.
The remote control shall enable the following functions:
 setting of the operation mode: heating, hot water, cooling
 2 zones & hot water control
 night setback
 frost protection
 hot water boost
 anti-bacteria function
 weekly timer
 The programming of the basic settings such as auto curve, test operation, settings
for electrical boost heaters
The hot water temperature shall be optimized by advanced control depending on the
outside air temperature. When ambient temperature is milder, the air-to-water systems
shall automatically produce lower water temperature to anticipate decreased needs of
space heating, on the other side the same control logic shall allow to anticipate increasing
heating needs when weather conditions become extreme; this overall temperature
management shall be able to give the best conditions of comfort.
Environmental care
The units shall use Ozone-friendly R410A refrigerant, a chlorine-free refrigerant of the HFC
group with zero ozone depletion potential
All components of heat pump system shall be free of any hazardous substances.
The packaging shall ensure high protection during transport and handling and is 100%
recyclable.
All savings of heat pump efficient operation shall have a positive impact on the personal
electricity bill and the community by reducing the CO2 emissions in the atmosphere.
Simple installation and service
- System shall be quick and easy to install. The hydro module unit can be placed safely in the
most suitable place within the house. No need for chimney or underground captors which
shall require additional works on site.
-The integrated hydronic module shall reduce space requirements and simplify the
installation. Only the power and the water supply and return piping shall need to be
connected.
- The units shall provide easy access to all internal components by easily removing the
complete front panel to access the refrigerant piping connections, control box and electrical
connections, the compressor and other key parts.
- The units shall be compact with small footprint to be easily transported through narrow
doors.
- Whenever required for maintenance purposes, all the R410A refrigerant shall be able to be
completely sucked back to the outdoor unit through a powerful embedded “pump down”
operation.
Unit reliability
- Third-party testing and certification - all performances shall be certified by Eurovent.
- All units shall be tested at various stages on the production line for circuit leakage,
electrical compliance, water and refrigerant pressures. End-of-line test shall be performed
for all unit operating parameters.
- The unit shall produce water at different temperatures for several applications
simultaneously. The air to water heat pump system shall operate smoothly both with low
outdoor air temperature down to -20 °C in winter and up to 43 °C in the summer season.
The system shall have a unique anti-ice build-up protection embedded.