Owners Manual - Air Compressors Direct

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SECTION 2SYSTEM DYNAMICSDescription & ApplicationQuincy Compressor QT Series and PLT Series compressors are heavy duty, aircooled, belt driven compressors. QT Series two stage compressors are splashlubricated and capable of delivering 175 PSIG of compressed air. The PLTSeries compressors are pressure lubricated and capable of delivering 175 PSIGof compressed air.Principles of Compression CyclesTwo Stage CompressorsDuring the downstroke of the piston of a two stage compressor, air is drawnthrough an intake valve in the head of the compressor into the low pressurecylinder and compressed during the upstroke of the piston.The compressed air is then released through a discharge valve in the headof the compressor to an intercooler (usually finned tubing) where the heatresulting from compression is allowed to dissipate. The cooler compressed airis then drawn into a second compression cylinder, the high pressure cylinder,for compression to final pressure.From there the compressed air is released through a discharge valve to anair receiver tank or directly to a network of compressed air supply lines. In onerevolution of the crankshaft a compression cycle is completed.Principles of Lubrication SystemsSplash Lubricated Compressors (QT Series)With each stroke of the compressor, a dipper attached to the bottom of theconnecting rod , dips into an oil bath at the bottom of the crankcase. This dippersplashes oil throughout the interior of the crankcase, lubricating all movingparts.It is important with this system that the correct oil level be maintained. Ifthe oil level is too high, excessive oil carryover could result. If the oil level is toolow, or the compressor is not operated within the correct RPM range, themoving parts will not be adequately lubricated.Pressure Lubricated Compressors (PLT Series)Moving parts within the crankcase are supplied with lubrication by a positivedisplacement, gerotor type oil pump. Oil is drawn up from the bottom of thecrankcase to the oil pump through an oil sump strainer screen. Oil travelsunder pressure through drilled journals in the crankshaft to lubricate crankshaftbearings and connecting journals.Principles of Cooling SystemsQT & PLT compressors are equipped with a compressor sheave with fan blades.These fan blades force ambient air across cylinder head and intercooler fins tocool the compressor. Xtreme compressor units are equipped with a compressorsheave and a fan mounted on the motor shaft. These fans force air through theQT & PLT SeriesQuincy Compressor50161-106, January 2009 4 3501 Wismann Lane, Quincy Ill. - 62305-3116
enclosure, across the motor, compressor and intercooler. These compressors aredesigned to be operated with the compressor sheave turning in a counterclockwiserotation (as viewed “tummy to the sheave”). QT, PLT and Xtremecompressors should be operated in temperatures under 104°F.Principles of Dryers & FiltersMoisture occurs naturally in air lines as a result of compression. Moisturevapor in ambient air is concentrated when pressurized and condenses whencooled in downstream air piping. Compressed air dryers reduce the moisturevapor concentration and prevent water formation in compressed air lines.Dryers are a recommended companion to filters, aftercoolers, and automaticdrains for improving the productivity of compressed air systems.Water and moisture vapor removal increases the efficiency of air operatedequipment, reduces contamination and rusting, increases the service life ofpneumatic equipment and tools, prevents air line freeze-ups, and reducesproduct rejects.QT & PLT SeriesQuincy Compressor50161-106, January 2009 5 3501 Wismann Lane, Quincy Ill. - 62305-3116
Page 1 and 2: QT ® & PLT ® Series2 Stage Compre
Page 3 and 4: Warranty StatementTrue Blue Warrant
Page 5 and 6: SECTION 1SAFETYSafety FirstAt Quinc
Page 7: The owner, lessor or operator of an
Page 11 and 12: Retain all containers and packing f
Page 13 and 14: Fig. 3-13 Phase Magnetic Motor Star
Page 15 and 16: Fig. 3-3Single Phase 5 hp-230V Econ
Page 17 and 18: Connect incomingpower lines at scre
Page 19 and 20: Fig. 3-7Start / Stop ControlPiping
Page 21 and 22: Fig. 3-9Dual Control with Pilot Val
Page 23 and 24: WARNING !Excessive compressor RPM
Page 25 and 26: where moisture can be easily remove
Page 27 and 28: WARNING !Oil and moisture residue m
Page 29 and 30: Step 12)Step 13)(Xtreme Units)-Make
Page 31 and 32: SECTION 5MAINTENANCE & LUBRICATIONS
Page 33 and 34: LubricationQT and PLT Series basic
Page 35 and 36: POCKET CLIPSLIDINGRUBBER O-RINGSDEF
Page 37 and 38: PILOT VALVE ADJUSTMENTSAll adjustme
Page 39 and 40: TroubleExcessive drive belt wearPro
Page 41 and 42: TroubleProbable CauseExcessive oil
Page 43 and 44: Typical QT & PLT Series Unit with V
Page 45 and 46: QT & PLT SeriesQUINCY COMPRESSORSTA
Page 48: Reciprocating / Systems: 217.222.77

Owners Manual - Air Compressors Direct

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