Fujitsu has launched the latest version of its award-winning J-Series heat pump mini VRF system operating on lower-GWP R32 refrigerant and delivering significant efficiency improvements.
The AIRSTAGE J-VS is the result of two decades of development and multiple upgrades as 2024 marks the 20th anniversary of the product affectionately dubbed 'Little Napoleon'.
AIRSTAGE J-VS
Aimed at small to medium-sized commercial applications or large residential spaces, the J-VS is available in capacities from 12-15kW.
The compact, single-fan chassis has a volume of just 0.3 m3 (17% less than the previous model) and a weight of only 74kg, aiding installation in tight spaces.
seasonal efficiencies
This line-up includes an additional 1.7 kW model and, due to heat exchanger optimization
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 an additional 1.7 kW model and, due to heat exchanger optimization, a new 1.1kW slim ducted unit.
Compressor innovation improves seasonal efficiencies up to a possible 8.27 SEER (up to 36% increase from the previous model) and 5.37 SCOP (up to 33% increase from the previous model).
J-series upgrade
Martyn Ives, Commercial Director at Fujitsu, said, "The J-series has proved itself over two decades and continuous improvements have maintained its position as a leader in its class."
He adds, "This latest upgrade, together with the new compatible indoor units, will ensure that it remains a strong proposition for a wide range of commercial projects."
IEC 603352-40
The system meets environmental safety standards specified in IEC 603352-40 for the use of R32 refrigerant.
Newly designed components include safety shut-off valves and leak detection sensors, which aid application when the design is deemed to be above the concentration limits of R32 in the event of a refrigerant leak. In addition, the refrigerant charge of the J-VS is 32% less than the previous model.
Compressor control technology
That rotational speeds can be reduced without a decrease in equivalent performance
A new compressor featuring improved compact windings and a larger displacement means that rotational speeds can be reduced without a decrease in equivalent performance.
Compressor control technology has also extended the minimum operating speed of the compressor to 15rps, managing low load conditions more efficiently and effectively than previous versions.
An elevation difference
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.
Redesigned cooling channels and suction line inverter PCB cooling allow 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.
