One of the very first steps when it comes to diagnosing your home air conditioner, refrigerator, or even your vehicle’s air conditioner is understanding the temperature and the current pressure that your system is operating at. Having these facts along with the saturation point, the subcool, and the superheat numbers for the refrigerant you are working on are essential when it comes to really understanding what is going wrong with your system.
After a visual inspection the very next step for the most seasoned technicians is pulling out their gauges and checking the pressure and temperature. It just becomes second nature after enough calls. I have heard stories of rookie techs calling some of the pros on their team for help on a system that they’re stuck on. It doesn’t matter what the situation is. It doesn’t matter if you’re in Miami or in Fargo. It will never fail that one of the first questions the pros ask the rookie is what is your subcool and what is your superheat? Having and understanding these numbers is key to figuring out what to do next.
But, these numbers won’t do you any good if you don’t know what refrigerant you are dealing with and what the refrigerant’s boiling point is at each pressure level. This article aims at providing you with just that information.
R-407F Refrigerant Information
As most of you know the phase out of R-22 began on January 1st, 2010. This initial phase out stated that no new R-22 machines could be imported or manufactured within the United States after this date. This was due to R-22 being directly responsible for Ozone Depletion. It is not just Ozone we have to worry about though folks. Some of these HFC refrigerants that we have been using for the past twenty years or so have a different problem called Global Warming Potential, or GWP. GWP is a measurement of how impactful a refrigerant is to Global Warming. The higher the number the more impact it will have.
One of the most notorious refrigerants in this category is known as R-404A. 404A is an HFC blend and has a GWP number of nearly four-thousand! 404A is used in low and medium temperature commercial refrigeration applications found in supermarkets, gas stations, and even vending machines. In recent years there has been a lot of pressure on companies and governments to use alternative refrigerants to R-404A in an effort to reduce their impact on the Climate.
One of these alternative refrigerants is known as R-407F also known under the name Genertron Performax LT. This product, from the Honeywell Corporation, is an HFC blend made up of R-134a, R-125, and R-32. While it does not have a perfect number when it comes to the Global Warming Potential scale it is significantly reduced when compared to R-404A. While 404A’s GWP is nearly four-thousand the R-407F comes in at only eighteen-hundred. That is a big drop! There is also no risk of Ozone Depletion.
407F was meant as a replacement for R-22 and R-404A in these supermarket/gas station applications. It is rated with an A1 grade from ASHRAE which means it is non-toxic and non-flammable. It may not be the perfect solution to those who are looking to reduce their climate footprint but you are able to retrofit exiting R-22 and R-404A units using this new refrigerant. That will save a significant amount of money versus having to purchase an entirely new system.
Regardless of what your thoughts on R-407F you will need to know the pressures and temperatures in order to properly maintenance it.
R-407F Refrigerant PT Chart
|Temp (F)||Temp (C)||Liquid Pressure (PSIG)||Vapor Pressure (PSIG)|