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Honeywell to offer R454B as alternative to R410A

BELGIUM: Honeywell has announced that it is now offering the lower GWP R410A replacement R454B, a refrigerant previously associated with its rival Chemours as Opteon XL41.

Without the fanfare that we normally expect from a Honeywell refrigerant introduction, the announcement of the addition of R454B to the Honeywell portfolio was included as a secondary item in a newsletter sent to customers this week. It will market the refrigerant as Solstice 454B.

Meanwhile, the industry still awaits Honeywell’s much-lauded non-flammable R410A alternative R466A.

Wide acceptability

An A2L refrigerant, R454B has previously always been associated with Chemours, from its time as DR-5, a DuPont development refrigerant and its subsequent passage through the ASHRAE classification process in 2015. 

Despite this, Honeywell lays claim to a patent on this refrigerant. When asked, Honeywell told the Cooling Post: “Honeywell identified the usefulness of R-454B as a R-410A replacement for air conditioning in 2009 and has patented this discovery.”

What is clear is that R454B has been accepted by an increasing number of chiller, heat pump and rooftop equipment manufacturers. These include Carrier, Trane, York, Mitsubishi Electric, Rhoss, MTA, Swegon, Flakt, Engie and GI. 

A blend of R32 and R1234yf with a GWP of 466, R454B appears to be the best current option for new equipment in applications where a lower-flammability refrigerant is an option.

Honeywell notes that the discharge temperature of R454B is much lower than R32 and, thanks to its higher critical temperature (77°C) and broader operating envelope in low evaporating temperatures, it outperforms other alternatives such as R32 in heating applications.

Where’s R466A?

The news of Honeywell’s new addition comes while the market still awaits news of its much-lauded non-flammable R410A alternative R466A. 

First announced by Honeywell in 2018 as Solstice N41, R466A was described as “a breakthrough” with its A1, non-flammable classification addressing “one of the most vexing regulatory and safety challenges facing the HVAC industry”. 

An eagerly-awaited potential option for use in VRF systems, it was originally going to be available in commercial quantities in the fall of 2019, then early 2020. Since then, there has been little news of this refrigerant, although it is accepted that OEM testing can be a protracted process, a process which may have been further delayed by the coronavirus pandemic.

A number of OEMs were initially reported to be working with R466A, including Chinese manufacturer Midea and Toshiba Carrier – a company which described the new refrigerant as “promising” after initial performance testing in a VRF air conditioning system. Component manufacturers Sanhua and Parker Hannifin were also known to be carrying out compatibility testing. 

There have however been rumours of stability and compatibility concerns related to the refrigerants blend’s key CF3I (R13I1) component. Honeywell has previously denied any problems, telling the Cooling Post last year that R466A was stable: “As seen with past introduction of new refrigerants, the stability and shelf life can be addressed with standard measures practiced in the industry,” it said.

As we approach the third anniversary of the initial announcement of the refrigerant, Honeywell maintains that R466A is now in the “advanced stages” of commercialisation, with samples having been provided to OEMs for evaluation to ensure compatibility with their equipment. 

“To date, Solstice N41 has undergone extensive testing by over 15 OEMs and leading compressor manufacturers and accumulated more than 100,000+ hours in different applications like commercial AC (VRF, rooftops) and residential AC (unitary),” the company said, but would not be drawn on a new release timetable. 

Related stories:

Trane to offer R454B refrigerant on scroll units12 February 2021
BELGIUM: Trane is set to offer its current portfolio of R410A chillers, heat pumps and rooftop units with the lower GWP A2L refrigerant R454B. Read more…

Carrier picks R454B for ducted ac19 December 2018
USA: Carrier has adopted the Chemours refrigerant R454B as its primary lower GWP replacement for R410A in ducted residential and light commercial air conditioners sold in North America. Read more…

Chemours’ XL41 approved for York chiller16 October 2018
USA: Chemours’ Opteon XL41 (R454B), a lower GWP replacement for R410A, has been selected by Johnson Controls for its York YLAA scroll chiller platform in Europe. Read more…

Chemours offers new low GWP blends11 October 2016
GERMANY: Chemours has announced the availability of its new range of low GWP HFO-based “mildly flammable” refrigerants. Read more…

Low GWP refrigerants win at high ambients25 September 2016
USA: The viability of new lower GWP alternative refrigerants in high ambients are said to have been proven in new tests. Read more…

Stability worry but R466A is “promising”17 October 2018
GERMANY: Bitzer sees R466A, Honeywell’s new non-flammable, low GWP refrigerant alternative, as a promising substitute for R410A but has concerns about its long-term stability. Read more…

Secret of Honeywell’s new refrigerant27 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…

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