
17 code HC0300.00GB ed.A-2212
HYN
AQUAPUMP HYBRID HYBRID SYSTEM
Structural work
All units are manufactured with hot-dip galvanised sheet, painted
with oven-dried polyurethane powders at 180°C to ensure the
best resistance to elements. Structural work is self-bearing with
removable panels to facilitate inspection and maintenance of
internal components.All screws and rivets for outdoor installation
are made of galvanised steel.
Cooling circuit
The cooling circuit is produced using components of leading
international companies and in accordance with standard UNI
EN 13134 concerning welding-brazing processes. The refrigerant
gas used is R32. The refrigerant circuit includes: 4-way reverse
cycle valve, electronic expansion valve, liquid separator, liquid
receiver, inspection valves for maintenance and control, safety
device (high pressure switch), pressure transducers to precisely
adjust evaporation and condensing pressure, lters to prevent
thermal expansion valve clogging.
each unit is pressure tested for leaks and supplied complete
with the optimised refrigerant charge for operation.
Compressors
Inverter DC compressors are of twin rotary type expressly
designed for operation with R32, provided with thermal protection
and installed on rubber anti-vibration elements.
Compressors are installed in a housing separated from the
air ow to reduce noise. The casing resistance activates if the
compressor has been turned o for at least 30 minutes and if
the drain temperature is lower than 20°C (with 2.0°C hysteresis).
Upon compressor restarting the casing resistance is disabled, as
it is activated when the compressor is switched o. Nonetheless,
the resistance works even when the unit is switched o to avoid
problems during restart. If the system is turned o completely,
it is recommended that the unit be electrically powered and
put into stand-by at least 12 hours before commissioning.
The temperature of the oil container must be at least 10°C
above room temperature. The inspection of the compressors
is possible by removing the side and front panels of the unit,
allowing maintenance even with the unit running.
Air side exchanger
Air exchangers are produced with copper pipes and aluminium
tabs. Pipes are mechanically spindled in the aluminium tabs
to increase the heat exchange factor. The geometry of these
exchangers allows a low pressure drop value on air side and
therefore the possibility to use fans with low number of revolutions
(with subsequent reduction of machine noise).
Utility side exchanger
The device exchangers are of the welding-brazing plate type
and are made of AISI304 stainless steel, factory insulated using
insulating closed cell material and are equipped with a KA
antifreeze resistor. Each evaporator is protected by a temperature
probe used as an antifreeze protection probe that activates the
circulator, even when the machine is switched o, in the event
the conditions set on the control are met.
KA antifreeze resistor
The antifreeze electric resistance is a factory tted kit
and is present on all machines.
The water antifreeze resistors on the faces of the evaporator
plates are activated even when the machine is switched o (but
powered on) when the delivery water temperature falls below 4°C.
The resistances are switched o when the temperature measured
by the outlet water probe exceeds 6°C.
On the other hand, the heating cable on the base of the machine
is activated when the external air temperature falls below 3°C.
It is deactivated if the external temperature exceeds 5°C.
Outdoor unit fans
Fans are produced with plastic material, of axial type with airfoil
blades. They are all statically and dynamically balanced and
provided with protection grille in compliance with standard IEC
EN 60335-2-80 (household and similar electrical appliances
safety). Fans are installed on the unit through the interposition
of rubber anti-vibration elements for noise emission reduction.
All electric motors used are of 8-pole modulating brushless type
(200/1000 rpm). Motors are directly coupled and equipped with
integrated thermal protection. All motors have IP 44 protection
rating.
Control panel
The electrical control panel is produced in compliance with
the current European Regulations. The electrical control panel
can be accessed by removing the front and side panel and
the unit cover using an appropriate tool. The protection rating
of the electrical control panel is IP24. Moreover, the panel is
equipped with terminal board with clean contacts for remote
ON-OFF, DHW external 3-way valve management and contacts
for remote control panel.
Cooling circuit control system
All units are equipped with microprocessor with overheating
control logic through the electronic thermostatic valve managed
according to the signals sent by pressure transducers. Moreover,
the CPU controls the following functions: adjustment of output
water temperature from plate heat exchanger, antifreeze
protection, compressor timer, alarm reset, alarm management
and operation LED. The control system, together with INVERTER
technology and on-board sensors, monitors and adjusts swiftly
and continuously the performance of inverter compressor,
circulator and indoor unit fans.
The INVERTER control system is able to manage
minimum system water contents of 20 litres thanks to the
presence of the boiler with anti-freeze system that allows
the number of defrosting cycles to be limited. Litres refer to
the absolute value, and not for every kW of installed power.
Hydraulic circuit
The AQUAPUMP HYBRID models are equipped with a built-in
hydraulic circuit that includes: modulating circulator with high
eciency brushless motor, suitable for the use of chilled water
and directly managed by the on-board machine control, plate
heat exchanger, protection ow switch, expansion tank, safety
valve (3 bar) to be connected to a collection system and manual
air vent valve.
Adjustment of outdoor unit fan revolutions
This type of adjustment, managed by the microprocessor, is
required to optimise the evaporation/condensing pressure in
summer/winter operation so as to allow the correct operation
of the machine.