Mitsubishi Electric has launched City Multi R32 YXM, a new generation of variable refrigerant flow (VRF) systems designed to extract more performance and lower emissions from the R32 refrigerant platform. Aimed at commercial buildings looking to decarbonise heating and cooling, the YXM range offers capacities from 12 kW up to 112 kW in both heat pump and heat recovery versions.
The company says YXM delivers around 20% reductions in both running costs and operational carbon compared with its existing R32 VRF models, alongside a 10% uplift in energy efficiency on a 30 kW reference unit. Outdoor units are also more space‑efficient, with a footprint about 6% smaller than the market average, helping designers squeeze plants into tight sites.
Re‑engineered around a patented vertical flat‑tube coil
Under the skin, the YXM platform has been completely re‑engineered, with Mitsubishi Electric highlighting a patented vertical flat‑tube heat exchanger wrapped around three sides of the outdoor unit. This geometry increases surface area and improves airflow, boosting heat transfer while keeping the chassis compact.
A new defrost system and outdoor fan design further optimise heating performance in cold conditions, improving seasonal efficiency and reducing comfort‑disrupting defrost cycles. Combined with next‑generation compressors, these changes are designed to squeeze more useful kilowatt‑hours out of each kilogram of R32, cutting both refrigerant charge and operational energy use over the system’s life.
Lower‑GWP R32 and a streamlined 2‑pipe architecture
As the name implies, City Multi YXM runs on R32, a lower‑GWP refrigerant than legacy R410A, aligning the product with tightening F‑gas rules and corporate net‑zero commitments. Mitsubishi Electric sticks with its patented 2‑pipe design for both heat pump and heat recovery systems, a configuration it argues simplifies installation and cuts embodied carbon.
The 2‑pipe layout reduces the number of brazed joints and risers, saving riser space in high‑rise buildings and lowering leak‑risk points. It also helps trim refrigerant volume, an increasingly important metric as designers balance safety, GWP limits, and performance on complex projects.
Safety, noise and control get long‑life upgrades
Recognising stricter safety expectations around refrigerants, the YXM series incorporates low‑level leak detection designed to comply with BS EN 378 Part 3. Each system can be fitted with a dedicated Sensor and Alarm Kit that has its own power supply; if a leak is detected, audible and visual alarms trigger, a shut‑off valve closes, and the affected indoor unit stops while others continue operating. Notably, Mitsubishi Electric quotes a 30‑year lifespan for these detectors, three times the industry norm of around 10 years, which could significantly reduce long‑term maintenance costs.
On acoustics, Mitsubishi claims market‑leading low noise levels and a five‑step low‑noise mode, giving designers and facilities teams more flexibility in sound‑sensitive applications such as hotels, offices, and mixed‑use schemes in dense urban areas. A centralised controller provides remote monitoring, scheduling, energy optimisation, and diagnostics across multiple indoor units, with integration paths to wider building management systems.
Scalable for both retrofit and new‑build
The YXM line is engineered to suit both retrofit and new‑build projects. A single outdoor unit can serve up to 50 indoor units, and multiple outdoor modules can be combined to deliver up to 112 kW of system capacity, offering significant flexibility in zoning and phasing. Mitsubishi Electric says the system is “simple to design,” with relatively basic limits on height and pipe length between indoor and outdoor units, helping consultants cut design time on complex layouts.
Available to install from spring 2026 in markets such as the UK, City Multi R32 YXM is pitched as a “future‑proof” R32 VRF solution, an evolution of Mitsubishi’s familiar City Multi platform, but tuned for a world where energy performance, refrigerant GWP, and whole‑life carbon are under tighter scrutiny than ever.