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MrBillPro

TRB on Thu January 15, 2004 9:17 PM User is offlineView users profile

Correct me if I'm wrong but you are in the commercial side of the a/c business, correct?

If so what have the commercial vendors being doing with these alternative refrigerants or do you not see it as much as in the auto industry?

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Dougflas on Fri January 16, 2004 5:14 PM User is offline

The alternatives are out there. Fortunately, most refrigeration techs mark the equipt with labels as to refrigerant and quantity. The problem with blends, if there is a leak, the whole charge must be recovered dur to fractionalization.The blends are designed for different uses. This is not fun anymore. Recovery tanks for each product, not being allowed to reuse the recovered refrigerant in a different system. Also, when retrofitting, oil may have to be changed and they recommend three oil changes to get it all out. This may involve unsoldering the compressor.

Karl Hofmann on Fri January 16, 2004 7:17 PM User is offlineView users profile

Tim,

I can't speak for the US market, but over here refrigerant blends are now the norm, sales of new equipment using R22 have just been phased out in favour of R407c and the industrys refrigerant of choice R410a. Many larger retail outlets and forecourt shops have had their R22 systems pumped down and replaced with R417a although it does not seem to perform as well when a heatpump is used to heat. R417a has been used a a straight drop in for some years now and has proven to be reliable.

I was quite surprised when at a seminar for Toshiba air conditioners they stated that if there was a leak and a system needed to be topped up, that it would be fine to top up a R407c system with no noticable effects.

After much deliberating the manufacturers have decided to stay with flare connectors on R410a equipment, though the flair must be made with a flairing tool with a concentric cone and a limiting clutch to ensure a good flare.

With regard to domestic refrigerators, units that use R600 do seem to be far more reliable than R134a units as the capilliaries do tend to wax up for reasons that are still unclear

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