MPI DC
4
All copying, even partial, of this manual is strictly forbidden.
RG66007970 - Rev 01
The actual thermal load of an air conditioning system is less than 60% of the
rated load capacity 90% of the time�
In case of low power installations with a low number of indoor units and low
water content, operation under part load conditions is especially critical�
In order to ensure that the unit functions correctly the variation of the power
delivered by the unit is necessary�
The inverter controller controls the compressor rpm through the modulation
of the refrigerant rate, the cooling capacity and the electrical input�
The operating logic of MPI DC units allows an accurate adjustment of the
outlet water temperature according to the thermal load conditions:
The PID control algorithm allows to adjust the water temperature within
+/- 15%�
The inverter controller allows to adjust the capacity and the input of the
compressor to the actual thermal load and makes it possible to considerably
reduce electrical intakes at the compressor start-up (reduction of starting
currents) and during the operation under partial loads�
The spinning airtight scroll compressors (for models from MPI014 DC to
MPI029 DC) or Twin Rotary compressors (for models from MPI08 DC to
MPI010 DC) are equipped with motor protection against overheating and
overcurrents�
Mounted on anti-vibration supports, complete with oil charge, they
are enclosed in a soundproofed compartment and equipped with an
automatically controlled oil heating system to avoid oil dilution by the
refrigerant when the compressor is stopped�
The compressor motor is a permanent magnets, brushless, alternating current
motor controlled by a trapezoidal wave driver operating in the frequency field
ranging from 30 to 110 Hz (BlDC “Brushless Direct Current” Technology)
The electronic control system allows the setpoint to be adjusted automatically
according to the outdoor temperature in order to reduce consumption and
broaden the working temperature range�
The condensation control adapts the fan rpm to the actual working conditions
1
The SeRIeS
This results in better working conditions, reduction of sound levels under
partial load conditions and possibility of operating in cooling mode beyond
conventional working limits (up to an outdoor air temperature of -10°C).
In heat pump operation the exclusive defrost system can correctly identify an
impairment of performance in the outdoor exchanger due to the formation of
ice and minimise the process time in relation to normal operation of the unit�
> PeRManenT MaGneTS eleCTRIC SynChROnOUS MOTOR
> lOWeR MOTOR IneRTIa eFFeCT
> COMPaCT DIMenSIOnS
> lOWeR nOISe eMISSIOnS
> nO ROTOR lOSSeS DUe TO CURRenTS anD InDUCTIOn -> hIGheR
eFFICIenCy aT PaRT lOaD
> hIGheR COMPReSSOR ISenTROPIC eFFICIenCy
The MPI DC series heat pump units can be also used in applications
to produce domestic hot water, 365 days/year, when connected to
"MYCHIllER DHW" (remote control/management panel)�
For general hydraulic schemes, see the control panel manual�
ReMaRK: this applications are not compatible with the option: water
buffer tank (on board)
