Quincy 125-350 HP Industrial Lubricated Screw Compressor Brochure
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QUINCY QSI 600-1500 ROTARY SCREW AIR COMPRESSORS 125-350 HORSEPOWER

UNPARALLELED PERFORMANCE The Quincy QSI® rotary screw compressor combines around-the-clock dependability with one of the most efficient, positive displacement airends available. Oversized rotors, low RPMs, and the Power$ync® advanced controller ensures maximum air production using minimum horsepower, which means bottom-line productivity. Backed by a ten-year airend warranty, the Quincy QSI features an exclusive Triplex bearing arrangement, a triple lip shaft seal, and boasts an airend life of more than 130,000 hours. This is the standard of True Blue Reliability that perpetuates the value...

• Triplex discharge end bearings • Full-flow fluid pump • Axial flow inlet housing • Warning and shutdown annunciator • 460 or 575 volt, 3-phase, 60hz, 1800 rpm motor • Full-voltage magnetic starter, mounted and wired, 460 volt (through QSI 750) • Flexible dropout coupling with OSHA guard • Heavy-duty structural steel base • Two-stage air/fluid separation • Full-flow, 12-micron fluid filter • Heavy-duty intake filter • Auto-dual control with modulation • Percent capacity gauge • Factory fill – QuinSyn family of synthetic fluids (food grade optional at no additional charge) • 5-degree...

QUINCY QSI 125-350 HP QuincyCompressor.com | Made in the U.S.A. | Performance You Demand. Reliability You Trust. 4 All normal maintenance items are conveniently located at one end of the machine for easy serviceability. Quincy uses a 12-micron absolute fluid filter with a special micro-fiberglass media to provide the best protection for the airend and bearings. The QSI line of compressors uses oversized aftercoolers with a 3-10 degree approach at standard conditions. This means more moisture is removed by the aftercooler, improving dryer efficiency. Quincy’s air/fluid separator design and...

5 Generously sized coolers ensure reliable operation in ambient temperatures as high as 115°F/46°C with aftercooler approach as low as 10°F/12°C. Rugged QSI airend with triplex bearings for maximum efficiency and operating life. Heavy-duty intake filter for quiet, trouble free operation. Axial flow inlet housing.

QUINCY QSI 125-350 HP QuincyCompressor.com | Made in the U.S.A. | Performance You Demand. Reliability You Trust. 6 Rotor diameter, length, and speed determine the acfm that can be produced. Logically, this means that a smaller airend with smaller rotors must turn faster than a larger airend with larger rotors to produce the same acfm. Larger rotors turning slower produce more acfm per brake horsepower. Typically, the clearance between rotors is known as the “leakage path.” Smaller rotors have a much greater “leakage path” than larger rotors. In addition, the faster the rotors are turning,...

7 As you might expect, Quincy’s oversized rotors allow for oversized bearings – over 56% larger than most competitors. But more importantly, the Quincy QSI features an exclusive Triplex bearing arrangement. This superior “three bearing” arrangement is designed to deliver over 130,000 hours of operation, far exceeding the average life expectancy of competing compressors. In addition, the Quincy QSI uses a positive displacement gear-type fluid pump to lubricate both the rotors and the bearings. This pump is driven by the rotor shaft, so as soon as the compressor starts, lubrication begins...

QUINCY QSI 125-350 HP QuincyCompressor.com | Made in the U.S.A. | Performance You Demand. Reliability You Trust. 8 Maximizing the efficiencies of the Quincy QSI, the patented Quincy Power$ync® is the most advanced electronic controller in the industry. Designed to monitor changes in system air pressure as well as the rates of these changes, the Quincy Power$ync microprocessor works constantly, adjusting to efficiently meet the air demands of your system. When the Quincy Power$ync senses a slow drop in pressure, the response rate is recalibrated to allow a delayed response before adding...

9 Every detail of the Quincy QSI has been refined for maximum efficiency and dependability. A one-piece, cast inlet housing allows intake air to enter axially to the rotors. The Quincy QSI axial flow inlet actually improves compressor efficiency by five to seven percent over traditional radial flow designs. Example: A QSI 600 delivers 623 acfm at 110 psig, while other competitors produce 631 acfm at a lower pressure of 100 psig. With a 10 psig pressure drop, Quincy will maintain 100 psig pressure to your plant, while the competition can give you only 90 psig. Power$ync’s part load...

QUINCY QSI 125-350 HP QuincyCompressor.com | Made in the U.S.A. | Performance You Demand. Reliability You Trust. 10 The Quincy QSI is both reliable and functional. A selector switch on the control panel allows the user to select auto-dual control or continuous run control. In the auto-dual mode, the compressor will load, unload, and modulate in response to system demand. If there is no system demand during the pre-set time delay, the compressor will shut down the main drive motor and, on air-cooled units, the fan motor. The compressor then goes into a “stand-by” mode and continues to...

11 Load/No Load This is a simple control alternative. A switch on the control panel allows the choice between modulation and load/no load. In this mode, the compressor does not modulate the inlet valve – the valve is either fully open or fully closed. Load/no load works with auto-dual control to turn the compressor off during extended periods of no demand. For systems that call for this type of control, maximum efficiency is gained by operating fully loaded, completely unloaded, or off. Net$ync® The next step in multiple machine control is the Quincy Net$ync®. This is an auxiliary control...