Fujitsu J-Series VRF on R32
16th September 2024
UK: Fujitsu has launched a new version of its J-Series heat pump mini VRF, operating on R32 refrigerant.
Aimed at small to medium-sized commercial applications or large residential spaces, the Airstage J-VS is available in capacities from 12-15kW. The compact, single-fan chassis has a volume of just 0.3m3 (17% less than previous model) and a weight of only 74kg.
Up to 13 indoor units can be connected from a new range including compact 4-way cassettes, low static slim ducted and high efficiency ducted units, alongside wall-mounted options. This line-up includes additional 1.7kW models and, due to heat exchanger optimisation, a new 1.1kW slim ducted unit.
Compressor developments are said to have improved SEERs up to a possible 8.27 and SCOP of 5.37, representing up to 36% and 33% increase on the previous model, respectively.
Meeting environmental safety standards in IEC 603352-40, the update series include newly designed safety shut-off valves and leak detection sensors. The use of R32 has also reduced the refrigerant charge by 32% compared to the previous model.
The new compressor features improved compact windings and has a larger displacement. The minimum operating speed has also been extended to 15rps, enabling low load conditions to be handled more efficiently and effectively.
Integrated refrigerant storage devices, which prevent liquid slugging to the compressor during low load conditions, allow for up to 120m of liquid refrigerant pipe, with a longest length of 50m and a 30m elevation between indoor and outdoor units. An elevation difference of 15m is possible between indoor units.
Fujitsu reveals that redesigned cooling channels and suction line inverter PCB cooling allows the unit to be placed in higher temperature locations without the risk of electrical damage caused by overheating. This enables the installer to take advantage of the fan’s 30Pa external static pressure capability, allowing installation in restricted locations using discharge air ducting.
