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Most air-cooled products (including chillers, rooftop units, and condensing units) use DX evaporators. Most DX systems allow oil to travel through the refrigeration circuit and back to the compressor oil sump. Great care must be taken during design to provide oil return, particularly at part load, when refrigerant flow rates are reduced.Water-cooled chillers often use flooded evaporators. In a flooded evaporator, even small amounts of oil can coat evaporator tubes and significantly diminish chiller performance. This can lead to an elaborate oil-recovery system. Magnetic bearings eliminate the need for these systems and oil management in general. In fact, the only required regular maintenance of the compressor is the quarterly tightening of the terminal screws, the annual blowing off of dust and cleaning of the boards, and the changing of the capacitors every five years. Complete service agreements and extended maintenance contracts can be provided by the manufacturer.

Feedstuffs fixProducers putting up hay and handling feedstuffs often cite a particular machine as a key to their success.Bob Minner, Fallon, Nevada, depends on quality baling equipment for commercial hay operation. "You have to keep up with changes in the machinery," Minner says. And quality equipment is key to producing dairy-quality hay for his customers, he says. Good dairy test hay will bring $110 to $115, and he has received up to $117 a ton for some.Minner shifted from small kick squares to big square bales eight years ago to meet the demand of local dairy operations. He operates a Hesston 8450 self-propelled windrower and a Hesston 4910 baler to cover about 6,000 acres a season. He double-rakes with a rotary machine for bigger windrows and to better dry the hay. The bales, measuring 8 feet long and weighing 1,750 to 2,300 pounds, are then picked up with a tractor-pulled bale wagon that hauls four bales at a time.