13 May 2021
Mitsubishi Heavy Industries Thermal Systems, part of MHI Group, has redesigned all 17 models in its KXZ series of building-use inverter VRF air conditioners.
Production began for Europe in April , with phase two of production scheduled for a successive launch across Asia, Australia and Latin America.
The new series, known as KXZ2, features a new exterior design while keeping the same outer unit dimensions. Further updates are said to include greater flexibility when connecting indoor and outdoor units, increased operational controls, and enhanced efficiency alongside energy performance.
The KXZ2 line features an increased vertical height difference*1 between indoor units and between indoor and outdoor units. A heightened difference between units creates a better-condensed refrigeration system in high-rise buildings with multiple indoor units, while also contributing to lower costs during installations. Further improvements for installations include increased flexibility to the units’ exhaust ducts to support installations in narrow urban areas.
Improvements based on energy and performance include an updated power demand control function with three levels, compared to the previous models’ two levels, and a newly developed compressor*2 that utilises a thrust (shaft bearing) plate to reduce energy input. As well as an increased external static pressure of 85Pa, increasing from a previous 50Pa*3.
Like the previous models, the new line-up has specifications designed to provide energy-efficient heating and cooling, particularly in the intermediate performance range. Including a multi-port system in the compressor scroll structure to limit power loss and an energy savings function that checks the internal room temperature to adjust the compressor rotation optimally.
A combination of up to three outdoor units with 10 to 20 horsepower (HP) delivers up to 60HP in outputs. For export specifications, this relates to 10 to 60HP.
*1: The elevation difference limitation has been expanded to 30 metres between indoor units (from 18m in previous models), and to 90m between indoor and outdoor units (from 70m) when the outdoor unit is installed above the indoor unit.
*2: The 10, 12, 18 and 20HP models utilise concentrated winding motors that reduce loss in the motor winding component.
*3: The pascal (Pa) is an international unit of pressure and stress, defined as the force of one newton per square metre.