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-449A XP40 Basic Info & PT Chart
R-449A is a non-azeotropic blend comprised of R-134a (25.7%), R-1234yf (25.3%), R-125 (24.7%), and R-32 (24.3%). This refrigerant falls into the new classification of refrigerants known as Hydrofluoroolefin family. You may also see R-449A labeled as XP40 or under the brand name Opteon which comes from the Chemours company. It has an A1 rating from Ashrae which means that it is one of safest refrigerants out there. (As safe as your standard HFC refrigerants like R-134a or R-404A.) This is a big point of note as most HFO refrigerants are either flammable or slightly flammable, but 449A is not.
This XP40 refrigerant was designed as a replacement for the commonly used HFC R-404A. The problem with R-404A is its immense Global Warming Potential of nearly four-thousand. R-449A is able to cut this number down to 1,397 which is almost a seventy percent reduction. It is also between eight to twelve percent more efficient then your standard R-404A systems.
Just like R-404A, R-449A’s primary applications range from industrial refrigeration and air conditioning over to commercial refrigeration found in your typical grocery store or gas station. It can even be used in ice rinks if needed. It can be used in new equipment and can also replace R-22, R-404A, R-507, and R-407A in existing equipment as long as the proper retrofitting is done. The good news is that the retrofitting procedure is quite simplistic compared to other alternative refrigerants. For a full retrofit guide click this link to be taken to the official Chemours official document.
Lastly, is your pressure temperature chart. As always if you see anything that looks incorrect please reach out to me and I will get it updated as soon as I can.
|Temp (F)||Temp (C)||Liquid Pressure (PSIG)||Vapor Pressure (PSIG)|
Thanks for reading,