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This article describes this new compressor technology and its first use in an ARI-certified chiller design.THE BEARINGSTraditional centrifugal compressors use roller bearings and hydrodynamic bearings, both of which consume power and require oil and a lubrication system. Recently, ceramic roller bearings, which avoid issues related to oil and reduce power consumption, were introduced to the HVAC industry. The lubrication of these bearings is provided by the refrigerant itself. (1)Magnetic-bearing technology is significantly different. A digitally controlled magnetic-bearing system, consisting of both permanent magnets and electromagnets, replaces conventional lubricated bearings. The frictionless compressor shaft is the compressor''s only moving component. It rotates on a levitated magnetic cushion (Figure 1). Magnetic bearings--two radial and one axial--hold the shaft in position (Figure 2).

I see it all the time: do-it-yourselfers suffering through projects using medieval tools, or hiring contractors to do jobs they could handle themselves if they only had the right tools.Truth is, you can get just about any tool you''ll ever need at a rental center. Here are a few time-and-sweat-saving tools that do-it-yourselfers often overlook ....JackhammerCOST: $75 to $120 per day BENEFITS: Ten times faster than a sledgehammer with fewer blisters and muscle aches.If you have a big stretch of concrete (like a large driveway) to break up, rent a 60- or 90-lb. jackhammer powered by a trailer-mounted air compressor ($120 per day). But for a smaller job--like steps windowsxppowertools or a sidewalk--a 60-lb. electric jackhammer is less hassle ($75 per day).

Whether you purchase a scan windowsxppowertools tool, lab scope, power graphing multi-meter, or a console-type analyzer, you deserve a reasonable return on that investment. You can''t rely solely on increases in technician productivity to pay for this expenditure. Many car owners like to competitively shop prices for repairs. If a customer brings in a vehicle with a driveability problem and asks. "What''s wrong?" and "How much will it cost to fix?" there''s no guarantee you''ll get the job. If he or she thinks your price is too high, he or she may call another shop. Since the second shop doesn''t have to diagnose the problem because you already did, its price might be lower and you''ll be out the diagnostic time you put in.Diagnostic equipment should be its own profit center. That means charging separately for diagnostic time. More than 80% of repair shops now charge separately for diagnostic services. Use to following formula to figure your ROI: