Galletti MPI DC
Air to Water Chillers & Heat Pumps 8 – 29 kW
Outdoor Packaged Unit with BLDC Compressor
Large operating range and energy eﬃciency under every condition.
The MPI DC series consists of 6 heat pump models and 5 cold only models and is intended mainly for residential or light commercial applications. Due to the control managed by a software program developed by Galletti, the MPI DC series’ adjustment logic makes it possible to adjust the water delivery temperature to the set value and to control the compressor so that the power generated by the machine is adjusted to the thermal load required by the system. This represents a strategic feature in the limiting of energy consumption, because the eﬀective thermal load of an air conditioning system is less than 60% of the nominal load most of the time.
The BLDC technology upon which is based the compressor’s electric motor guarantees the ability to change the rotation speed in a frequency range between 30 and 120 Hz, thereby reducing at the same time the power consumption and thus maintaining a high level of eﬃciency in the operation at partial load and improved isentropic eﬃciency. These units’ large operating range, which is also achieved due to the variable ﬂow water circulator they are equipped with as a standard feature, guarantees operation with air temperatures from -15 °C up to 52 °C, while in heating mode it is possible to produce hot water up to 58 °C. This allows their use as a single generator in addition to summer air conditioning, even in medium-temperature heating systems and for the production of DHW. Furthermore, the innovative Smart Defrost System guarantees that defrosting always occurs in the most eﬃcient manner even under the most extreme environmental conditions.
MPI DC can be the only heat generator in low-power systems due to its large operating range that includes both low winter temperatures and high summer temperatures.
- Twin-rotary or scroll compressor driven by an electronic control BLDC motor
- Electronically controlled electric expansion valve
- Modulating hydraulic pump with stainless steel impeller
- Optional internal buffer tank
It is constructed of galvanized and painted sheet metal that is resistant to corrosive agents. Compressor compartment closed and accessible from three sides due to easily removable panels, available also with internal coating of soundprooﬁng material.
Hermetic twin-rotary or scroll compressor driven by a permanent magnet BLDC motor and controlled by a trapezoidal wave inverter. It is attached to the base by means of rubber dampers to reduce the transmission of vibrations.
- Heat exchanger
Finned heat exchanger constructed with copper pipes mechanically attached to aluminum fins, carefully designed to minimize the defrosting phases and optimize heat exchange efficiency in every operating phase.
- Electronically controlled electric expansion valve
Key component for the proper functioning of the unit. The PID control algorithm allows it to quickly adapt to all operating conditions and to keep the cooling cycle stable.
- Hydraulic Kit
Variable flow centrifugal circulator with stainless steel impeller. An expansion vessel and the automatic filling tap are also included. An inertial buﬀer tank built into the structure is available as an optional accessory.
- DHW Kit
A system that makes it possible to transform the MPI DC heat pumps into multi-purpose units that are able not only to meet the requirements of the air conditioning system, but also to produce domestic hot water as a priority by means of the Galletti TP or TN series thermal storage tanks. It is comprised of a microprocessor control unit with LCD display and a 3-way motorized valve. Also, anti-Legionnaire’s disease cycles can be activated by means of a heating element.
The models are completely conﬁgurable by selecting the version and the options. An example of conﬁguration is shown below.
Cooling Only Versions
MPIDC…CMAC Water chiller 230V – 1 – 50 Hz MPIDC…C0AC Water chiller 400V – 3N – 50 Hz
Versions with Reversible Heat Pump
MPIDC…HMAC Air to Water heat pump 230V – 1 – 50 Hz MPIDC…H0AC Air to Water heat pump 400V – 3N – 50 Hz
1 – Expansion Valve
A Electronic 230V
2 – Pump User Side And Accessories
1 1 Modulating standard pump, system side
2 1 EC pump, system side
3 – Buffer Tank
S Present, system side
4 – Desuperheater
5 – Fans
C Standard with condensation control
E BLDC with electronic control
6 – Antifreeze Kit
E Base (plate exchangers only)
P Additional protection for 1 pump
S Additional protection for 1 pump and tank
7 – Sound Insulation
1 Compressor compartment soundproofing
2 Compressor silencing housings
3 Opt 1 + Opt 2
8 – Cooling Accessories
M Refrigerant pressure gauges
9 – Remote Control / Communication
2 RS485 (Carel / Modbus)
S Simplified remote control
X Advanced remote control (PCOXS)
10 – Special Heat Exchangers
R Copper / copper
B Fins pre-coated with epoxy paint
11 – Condenser Protective Grille
12 – Compressor Options
4 Exchanger heating cable (Heat Pump only)
13 – Microprocessor control
2 pCOXS controller
- Base rubber vibration dumpers
- Base spring vibration dumpers
- Simplified remote control
- MYCHILLER BASE (RS485 is a mandatory accessory)
- MYCHILLER PLUS (RS485 is a mandatory accessory)
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