Such should not be the practice on RA systems. It is the author's opinion that only high-temperature brazing materials such as Silphos type brazing rod or one of the silver solders be used on any R system.
It is even more important to use suitable brazing materials on RA systems. Moisture And Evacuation The hygroscopic nature of the oils used in RA systems cannot be over-emphasized. Moisture can be a significant problem to the proper operation and life expectancy of any system operating on the mechanical refrigerant cycle.
Therefore, it is more important than in the past to take precautions to keep moisture out of a system during installation and service, to evacuate to microns, and replace filter-driers when a system has been opened. Questionable workmanship that may have gotten a technician by when working on R systems will not be tolerated by RA systems.
Tools Gauge manifold sets, hoses, recovery cylinders, and the recovery machine must be rated for the higher pressures encountered with RA. An attempt to use standard refrigerant service tools on A systems is very dangerous and simply foolish. Recovery cylinders must be rated for RA use. Be very careful here; it would be very easy and convenient to use whatever recovery cylinder was handy rather than the correct cylinder.
Such a mistake could be the last one a technician makes. Therefore, any leak detection device or method that works for other HFC refrigerants will work for RA.
The only difference is the necessity to use a recovery machine and cylinders approved for the higher pressures of RA. Charging Since RA has a slight 0. Otherwise, follow the manufacturer's recommended charging procedure.
The dewpoint and bubble point temperatures may be ignored they are not even listed on temperature-pressure charts for RA when calculating system superheat and subcooling. Set yourself and your contractor apart as certified, qualified, and safe providers of the new A systems. This refrigerant and its systems are here to stay. Norm Christopherson is a technical writer, seminar presenter, and former HVACR instructor with over 30 years of experience in the industry.
He is currently seeking training opportunities. He can be contacted at nchristo juno. This website requires certain cookies to work and uses other cookies to help you have the best experience. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Visit our updated privacy and cookie policy to learn more. This Website Uses Cookies By closing this message or continuing to use our site, you agree to our cookie policy.
Learn More This website requires certain cookies to work and uses other cookies to help you have the best experience. November 2, Order Reprints. Several major manufacturers are producing comfort air conditioning equipment using refrigerant A. The trend towards the use of RA continues to grow and there is a demand for technicians who are comfortable working with this higher-pressure replacement for refrigerant Due to the differences between R and the newer A, there is a concern within the industry regarding what those differences are as well as the additional training required to safely work on A systems.
With the trend toward the use of RA, technicians need to know the differences between R and RA and be ready to handle both refrigerants. Arkema Inc. Dynatemp Refrigerants Co. Golden Refrigerant. Account Application Apply for a credit account tempz. Approved Installer What? Can't Open Links? Web browser compatibility. Truth is nowadays the technology is far superior to that of old. The issue could be to do with setup and understanding of the refrigeration cycle, particularly when it comes to superheat.
This article is to help technicians to better understand what superheat is and how simple it is to check, but most importantly, to understand its purpose.
Checking superheat is as easy as adjusting superheat which should be done on all refrigeration systems. The compressor's lifespan! The compressor needs the correct amount of returning refrigerant to keep its motor windings at the correct temperature and most importantly its oil at an optimum.
In this scenario, the compressor will get too hot causing its sump oil to overheat, slowly break down and lose its viscosity lubricating effect. Thanks again. The way you are describing air to refrigerant is just brilliant!!! Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed. Get Tech Tips Subscribe to free tech tips. By July 27, Share this Tech Tip: Facebook 0 Tweet 0.
Does that sound right? So, what should the superheat be? The air around us is all superheated! Head for the hills! But why do we care? Remember, this chart ONLY applies to fixed orifice systems. Related Tech Tips. Piston Design and Bypass I remember it like it was yesterday. It was my first day of work as a trainee at my first technician job, just a wet-behind-the-ears kid fresh out of trade school.
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