Still, the answer is an emphatic, “No.” Not only would a retrofit of this type negate the environmental benefits of R-1234yf, but it would also be a violation of Federal Law under Section 203 of the Clean Air Act: “tampering” with a vehicle's emissions control device.
R-134a and R-1234yf systems have unique fittings so they can only be used with the appropriate corresponding refrigerants and equipment.
Refrigerant types are not to be mixed. The usage of dyes and sealants is discouraged. Dyes and sealants are considered contaminants and will reduce the performance and longevity of the lubricant. Use refrigerant sniffers for leak detection and repair leaking equipment per SAE and EPA guidelines.
Technically yes, as the pressures are similar. In fact an empty R1234yf system could even be recharged with R134a and still work - this is why they changed the connectors again, and in part why the R1234yf recovery machines are designed to sense if the refrigerant is contaminated with R134a and abort.
2 (a) shows that the variation of the pressure-volume diagram is very similar when using R1234yf and R134a, with, R134a shows a higher final discharge pressure, with the difference in the indicated work for compressor when using both fluids to be less than 2%, as shown in Fig.
Still, the answer is an emphatic, “No.” Not only would a retrofit of this type negate the environmental benefits of R-1234yf, but it would also be a violation of Federal Law under Section 203 of the Clean Air Act: “tampering” with a vehicle's emissions control device.
Most vehicles have a label or sticker under the hood that indicate whether the refrigerant used is R-134a or R-1234yf.
Avoid breathing gas. Provide adequate ventilation. Wear appropriate respirator when ventilation is inadequate. Put on appropriate personal protective equipment.
There are three refrigerants that can be used to replace R-134a: R-1234yf, R-152a, and R-744.
Switching to R1234yf refrigerant is a step towards a greener future, but it comes with higher costs due to advanced equipment, stringent regulations, and specialized training.
In with the new
The new refrigerant type uses ND-oil 12, also a PAG 46 oil but with additives specifically for the R1234yf type refrigerant.
Changing from R-1234yf to R-134a refrigerant may result in a system with incorrect refrigerant flow and heat exchanger mal-distribution which may cause a loss of cooling performance or durability concerns.
The results of this study have shown that the cooling capacity of R1234yf AAC system is significantly lower (between 5 to 25 %) than R134a system.
The EPA declared R-134a “unacceptable” for new vehicles as of model year 2021 but has not taken any action against R-1234yf and does not classify it as an environmentally persistent per- and polyfluorinated substance (PFAS) chemical.
For example, when set to R134a, the HLD5000 will also react to concentrations of HFO-1234yf but not with the right signal size.
As standard, all MAHLE ArcticPRO® air conditioning service units have an inte- grated flushing function that allows fast, low-cost flushing of the air conditioning system with the refrigerants R134a or R1234yf. An external flushing unit and parts from a flushing kit will be required— both are available separately.
Lower Global Warming Potential (GWP): 1234yf refrigerant has a significantly lower GWP compared to 134a, making it a more environmentally friendly option.
General Motors began introducing vehicles to the market utilizing this new system in 2013 with full conversion in 2018. Chrysler, Honda, and Subaru models followed in 2017. It is anticipated that by 2025 all vehicles will contain 1234YF.
R1234yf has an atmospheric life of 11 days compared to a 13 year lifespan for R134a. R1234yf compares in efficiency to R134a and has the same cooling capacity. Vehicles using R1234yf are expected to use less fuel and produce 20-30% less CO2 which means a significantly reduced carbon footprint. R1234yf is safe to use.
Switching to R1234yf refrigerant is a step towards a greener future, but it comes with higher costs due to advanced equipment, stringent regulations, and specialized training.