It's also the right time of year to get your furnace Read More. Call Today! Why Make the Change? Here are a few of the biggest reasons the changeover is such a good idea: Reduced ozone damage: R22 causes ozone depletion when it leaks.
Improved efficiency: RA is able to absorb and release heat better than R22, making it more energy efficient. Image provided by Bigstock Facebook. Search Search for:. Local Reviews. Pin It on Pinterest. Increase Font Size. To retrofit an R system with RA system your line set must not be more than feet in total distance. If the line set is longer than this, you will have to replace the line set with larger lines. If you are reusing the line set not recommended if replacement is at all possible you must flush your system to remove the mineral oil used with R refrigerant as well as any other contaminants.
After removing from the path of flow the old filter drier s and all existing old equipment condenser and evaporator , the technician will crimp the outlet of the line set to allow flush to linger longer over the system contaminants. Apparently, contractors say they have been told by their suppliers and even some refrigerant manufacturers reps that this is a viable plan.
The article also states refrigerant manufacturers are simply discouraging the practice. I guess I was blindsided by the advent of this happening because I know the great differences between the refrigerants.
I just thought no one would be foolish enough to try such a thing. After a couple days, a woman called me. Next, I was told there are no charging charts for unknown blends of refrigerants. But since so few service techs rely on charging charts, that issue is moot. And finally, I was informed Ra will make any rubber seals such as in Schrader valves smaller, again resulting in more leaks.
Was that it? Does it just come down to more leaks and recovery problems? Understand this: The mineral oil in a compressor has a vapor pressure. Sometimes the copper lines connecting the components also must be replaced, but it may be possible to clean, flush and dry the lines if they can handle the higher pressures of RA. A crucial part of the conversion process is removing all moisture from the system and ensuring it is free of leaks before charging with the RA. The polyethylene-based lubricating oil breaks down in the presence of water.
After the new RA mechanical components are installed and all line connections brazed, the installer must connect a vacuum pump to the system, draw it down to a vacuum of microns, and hold it there for several hours, sucking out any traces of water vapor that boil out of the system in this hard vacuum. Leaks in the system make it impossible to hold the vacuum until they are found and fixed.
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