World News

Industry news and insights from Europe and around the World

UK News

Latest news and developments in the United Kingdom


Keep up-to-date with the latest new products and technology


General articles, applications and industry analysis

Promising results for R466A in VRF air con tests

USA: Toshiba Carrier is said to have described R466A, Honeywell’s new non-flammable R410A replacement, as “promising” after initial performance testing in a VRF air conditioning system.

The findings were presented at a symposium on new refrigerants organised by the Japanese manufacturers’ association JRAIA in Kobe last month.

Honeywell announced the development of R466A in June last year to enormous global interest. To be marketed by Honeywell as Solstice N41, the new refrigerant appears to answer a demand for a non-flammable, low GWP alternative for R410A. Previous solutions R32 and R454B are “mildly flammable” A2L gases, suitable for residential split and smaller commercial units but not acceptable for larger-charge VRF systems. At 733, R466A has a similar GWP to the A2L alternatives.

While the Cooling Post has not seen the test results, according to Honeywell the efficiency, cooling and heating capacity of VRF systems using R466A is “very similar” to those using R410A. Design pressures of R466A were also slightly lower than R410A. Its life-cycle climate performance, when including direct and indirect emissions, shows emissions from the use of R466A to be 30% lower than R410A.


“To meet Japan’s HFC phase-down requirements in support of the Kigali Amendment, Toshiba Carrier is actively seeking a next-generation replacement for R410A that is energy efficient and safe for our customers and the environment,” said Toshiba Carrier in a statement.

“After the promising initial performance testing, we are excited to see if Solstice N41 can be a non-flammable, safe alternative to R410A that could contribute to the achievement of Japan’s HFC phase down goals. We have been engaging in reliability testing to handle the newly developed refrigerant in VRF systems.”

R466A mixes 49% R32 and 11.5% R125 with CF3I, a flammability suppressant.


Compressor manufacturer Bitzer, in its most recent Refrigerant Report, described the differences between R410A and R466A as “relatively small” in terms of thermodynamics. Volumetric refrigerating capacity, pressure levels and discharge temperature were reported to be slightly higher, and the refrigerant mass flow about 15-20% higher. The temperature glide is also very low.

“The Toshiba Carrier finding in the initial testing is a great validation that our nonflammable, reduced GWP Solstice N41 technology is poised to solve a key problem, becoming the next global standard for refrigerants,” said Sanjeev Rastogi, vice president and general manager of Honeywell Fluorine Products. “What we invented and achieved in Solstice N41 can be a true breakthrough as it provides the industry with a near drop-in solution that maintains safety levels across the value chain while offering significant environmental benefits.”

Honeywell expects full ASHRAE approval this month, with availability for OEMs as early as mid-2019.

Related stories:

R466A has close performance to R410A – 14 October 2018
GERMANY: Solstice N41, Honeywell’s new non-flammable lower GWP refrigerant, is said to have performance characteristics close to R410A. Read more…

Honeywell’s N41 – a blast from the past – 24 August 2018
CF3I is, seemingly, the unknown quantity in Solstice N41, Honeywell’s new R410A replacement refrigerant. But the records show that far from being new to the refrigerants business, it has been considered as a component in replacements for CFCs, HCFCs as well as HFCs in tests dating back at least 30 years. Could the earlier adoption of CF3I have saved the industry a number of system changes along the way? Read more…

Secret of Honeywell’s new refrigerant – 27 June 2018
USA: Honeywell’s development of a non-flammable low GWP alternative to R410A has created huge interest, but what’s in it? The Cooling Post may have the answer. Read more…

Honeywell announces R410A breakthrough – 26 June 2018
USA: Honeywell has announced the development of a new lower GWP non-flammable alternative to R410A in stationary air conditioning systems. Read more…

Latest News

18th July 2024

Cylinder explosion destroys car

SPAIN: Early reports suggest a car destroyed on a street in Malaga last week was caused by an exploding refrigerant cylinder.
18th July 2024

European heat pump sales down 6.5% in 2023

BELGIUM: Heat pump sales were 6.5% lower in 2023, the first fall after ten years of annual growth, threatening Europe’s 2030 climate targets.
17th July 2024

SWEP BPHE for lower GWP refrigerants

USA: SWEP has launched the 190 range of brazed plate heat exchangers optimised for low GWP refrigerants.
17th July 2024

Airedale data cooling solution commended

USA: The first data centre at Corscale’s Gainesville Crossing campus is set to open following the successful integrated systems testing (IST) of the recently installed Airedale by Modine cooling solution.
17th July 2024

Mirai Intex extends ULT air-cycle machine

CZECHIA: Mirai Intex has extended its range of air-cycle refrigeration process chillers with the MC 150 T unit, providing ultra-low temperatures from -40°C down to -160°C.
17th July 2024

Paul Kenny named EHPA director general

BELGIUM: Paul Kenny, a sustainable energy expert and former special advisor to the Irish government, has been named as the new director general of the European Heat Pump Association (EHPA).