HIWARM
5
10
15
20
~3°C
Scroll Twin Rotary
22
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RG66007967 - Rev 02
Inverter:
A static converter of electrical energy, that is a rectifier and
an AC-DC AC converter. The function of the inverter is to
control the motor power supply during an actuation. From a
more general aspect, the inverters allow the amplitude and/
or frequency of the motor supply voltage to be changed.
It is required when brushless synchronous motors with
permanent magnets (BLDC) are used, in order to guarantee
motor operation.
The inverter compressor is driven with proportional
regulation and proportional plus integral regulation on the
set-point in any mode:
If a simultaneous request is made by the utility - cooling the
room and DHW for the system - the default set-point speed is determined by the minimum speed of the two. After the
initial start-up phase, the inverter modulates the performance of the motor in real time according to the demand of the
application, thereby supplying only the real power requested. Consequently, the frequency varies from a minimum value of
20 (30) [Hz] to a maximum of 120 [Hz] depending on the utility demand. The maximum acceleration is defined by the torque
limits that can be supplied as well as the need to minimise the amount of oil entrained into the transients and is a parameter
that cannot be modified.
INTERNAL TEMPERATURE °C
MODEL WITH
INVER
TER
ST
AND
ARD MODEL
TIME
Scroll or Twin-Rotary R410A Compressors:
Processing optimisation together with a careful choice
of the intrinsic volumetric compression ratio (ICR) allows
for a significant improvement in isentropic compression
performance and a consequent reduction in energy loss
during the process. Low viscosity oils can be used thanks to
the scroll and twin rotary compressor, which greatly reduce
evaporator thermal resistance, compared to high viscosity
oils, with an increase of over 1.5°C in the evaporation
temperature (over 5.5% in EER), with respect to alternative
solutions.
Hermetic orbiting Scroll compressors (HiWarm22 and
HiWarm33) or Twin Rotary compressors (HiWarm12) are complete with motor protection against over temperature,
overcurrents and excessive gas flow temperatures. Mounted on anti-vibration dampers, complete with oil charge and
inserted in a soundproof compartment with sound-absorbing material. Also complete with an automatically activated oil
heater to prevent the oil from being diluted by the refrigerant when the compressor stops.
The compressors have a brushless synchronous motor with permanent magnets, piloted by a driver with a trapezoidal wave
signal at a speed rate between 30 (20) and 120 Hz [BLDC Technology “Brush Less Direct Current”].
