Mitsubishi Electric US, Inc.’s Cooling & Heating Division (Mitsubishi Electric), manufacturer of Zoned Comfort Solutions™ and Variable Refrigerant Flow (VRF) cooling and heating systems, has introduced latest innovation in VRF technology — the CITY MULTI® L-Generation Air-Source outdoor units. The L-Generation (6 to 30 tons; single modules up to 14 tons) has achieved significantly improved efficiency ratings (see table below) due to HexiCoil™ technology, a zinc-aluminum flat tube heat exchanger that maximizes heat transfer capability through its distinctive fin shape. Increased efficiencies across all categories make this outdoor unit ideal for projects with efficiency goals such as LEED® certification or net zero status.
“The L-Generation, with its HexiCoil technology, represents a significant enhancement in efficiency and operation for the VRF category,” says Kevin Miskewicz, director, commercial marketing, Mitsubishi Electric US, Inc.’s Cooling & Heating Division. “This coil redesign includes turbulated tube walls and an optimized cross section, ensuring maximum heat transfer ability. This advancement directly leads to improved efficiencies, particularly at part load conditions.”
The unique fin design of the HexiCoil product, along with its zinc outer coating, provides superior water shedding capability and corrosion resistance, prolonging the outdoor unit’s lifespan. The capillary tube system ensures even fluid distribution, further contributing to superior heat transfer ability.
Other L-Generation enhancements include:
- 30% smaller footprint than previous models, making the system ideal for projects with tight mechanical spaces
- Up to 50% reduction in system refrigerant charge; refrigerant circuit design optimized for improved flow distribution
- Improved high-ambient cooling operating range; guaranteed cooling operation up to 126°F
- Improved vertical separation between indoor units within the same heat recovery system (a distance of up to 98 feet) — expanding design options.
These VRF outdoor units are designed for quiet operation — 58 to 65 dB(A). All models in the L-Generation now include a bellmouth grill with a DC fan motor, which reduces static pressure while minimizing power input. See the table below, comparing this new L-Generation series from Mitsubishi Electric with the company’s K-Generation series.
 outdoor unit suitable for facilities pursuing LEED certification or net zero energy.){kind=link}