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When connecting the fuel lines, the fittings should only be snugged. When tightening a fitting, hold the delivery valve on the pump or the end of a nozzle, so that it won''t turn. If the pump''s delivery valve or a nozzle moves while removing or tightening a fuel line, it must be retorqued with a calibrated torque wrench. If improperly torqued, the injection pump or nozzle can seize.* Fuel Filters -- Fuel filters vary in size, shapes, and functions. Some have water drain plugs in the bottom of the canister cups. Some have see-through canister cups to show if water has collected. Some have air vents for easy priming. Some have removable fittings for measuring fuel vacuum or pressure.

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).