i-SHWAK V4
Inverter air/water chillers and heat pumps with wall-mounted indoor unit and remote condensing outdoor unit
10
6
TECHNICAL CHARACTERISTICS
The reversible
heat pumps
“
i-SHWAK V4
”
series are designed for applications in residential and commercial areas, these units are
extremely versatile and can operate in heat pump mode with the ability of producing hot water at a temperature of 63°C using the
electric heaters for environmental heating and sanitary applications.
The new i-SHWAK V4 system, which is the result of the evolution of the previous model V3, is the ideal solution for the total home
climate control (with the accessories Hi-T and HNS Box). For new or already existing house if equipped with a radiant floor or fan
coil as heating system, with feeding from electric power network and a renewable energy sources.
The INVERTER compressor with brushless DC motor technology, matched with electronic expansion valve, pump and variable
speed blower always with brushless motor, as well as the integrated circulators, optimize the power consumption and the
operation efficiency of the refrigerating components and of the entire system.
6.1
FRAME
The “
i-SHWAK V4
”
units are all made up of hot-galvanised thick sheet metal, painted with polyurethane powder enamels at 180°C
to ensure the best resistance against atmospheric agents. The frame is self-supporting with removable panels. All screws and
rivets for outdoor installations are in galvanized stainless steel. The indoor units also have a self-supporting structure made of
galvanized steel with removable painted panels.
6.2
REFRIGERANT CIRCUIT
The refrigerant circuit has been manufactured by means of international primary brands components and according to the UNI EN
13134 rule concerning welding procedures. The refrigerant gas used in these units is R410A. The refrigerant circuit includes: 4 way
reverse cycle valve, electronic expansion valve, liquid separator, liquid receiver, valves for maintenance and control, pressure
safety device (high pressure switch), pressure transducers to accurately control the evaporating and condensing pressures, filters
for throttling valve to avoid its clogging, SAE valves for liquid and gas line.
6.3
COMPRESSORS
The used DC inverter compressors are twin rotary hermetic type, designed especially to be used with R410 refrigerant. The
compressors are all supplied with thermal overload protection and are mounted on a rubber material acting as shock absorbers.
The compressors are mounted in a separate chamber in order to be separated from the air flow for reducing noises and are also
supplied with crankcase heater which operates in order to avoid the oil dilution which may cause seizure of the compressor. The
crankcase heater starts when the compressor remains off for duration no less than 30 minutes and when the discharge
temperature is under 20°C (with hysteresis of 2.0°C). When the compressor restarts, the crankcase heater will stop operation. We
recommend to turn on the unit and to put it in standby mode at least 6 hours before the first startup.
The inspection of the compressor is possible through the front panel of the unit that allows the maintenance of the compressors
even if the unit is working.
6.4
AIR SIDE EXCHANGERS
The air side exchangers are made up of copper pipes and aluminum fins. The diameter of the copper pipes is 9.52mm, the
thickness of the aluminum fins is 0,1mm. The pipes are mechanically expanded into the aluminum fins to improve the heat
exchange factor. The geometry of these condensers guarantee a low air side pressure drop and, then, the use of low rotation
speed (and low noise emission) fan motors.
6.5
FANS
The fans are axial type with aluminum aero-foil blades. They are statically and dynamically balanced and supplied complete of the
safety fan guard according to the CE EN 60335-2-80 rule (safety for electrical apparatus of domestic and similar use). They are
mounted on the unit frame by interposition of rubber vibration dampers. The electric motors are all brushless DC type with 8
poles (about 200/1000 rpm). The motors are directly driven with an integrated thermal overload protection. The protection class
of the motors is IP44.
6.6
USER HEAT EXCHANGERS
The user heat exchangers are made up of AISI 304 stainless steel braze-welded plates type. The user heat exchangers are factory
insulated with flexible close cell material. Each evaporator is provided with a temperature sensor working as antifreeze protection
that activates the circulator, even in the case when the unit is turned off when the condition parameters set in the controller have
been occurred.
6.7
ELECTRIC BOX
The electric box is manufactured according to according current European Union laws. The accessibility to the electric board is
possible after removing the side and top panels of the outdoor unit by using an appropriate tool, and by removing the ABS plastic
cover for the indoor units. The protection degree is IP24. The outdoor unit terminal board is supplied with voltage free contacts
for general alarm. The indoor unit terminal board is supplied with contacts for the sanitary water temperature sensor, auxiliary
heater and the handling of the outer 3-way valve.
