Features and Benefits
2
Ingersoll Rand Impact
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Semi-hermetic Reciprocating Compressors
Features and Benefits
x Small physical size and weight for comparable displacement and capacity
x Universal
oOne compressor version for all temperature ranges using R404A, R507,
and R22
x Smooth and Quiet Operation can be Attributed to:
oShort stroke operation
oMultiple cylinders positioned to avoid harmonic frequencies
oBalanced drive systems
oCylinder heads with cast in muffler
oPrecision machining
x Unloaders
o1 step (50%) capacity control on 4-cylinder models
o2 steps (33%, 66%) capacity control on 6-cylinder models
x Motors
oDual voltage on models above 1480 CFH
oMotor efficiency 90% or greater
oElectronic motor protection with embedded thermisters to sense motor
winding temperatures
x Oil System – IR4C models, smaller 4 cylinder compressors
oEnhanced centrifugal lubrication system
oFront main bearing is located in cavity on front bearing plate and is
submersed in oil
oFills front bearing cavity with oil in a fraction of a second
oWhen oil is diluted with refrigerant, separation of oil and refrigerant takes
place as the oil is “slung” against the front bearing cover
oOil travels down internal passages in the crankshaft, driven by centrifugal
force. This lubricates the connecting rod bearings and motor bearings
oHydrodynamic lubrication provides enough oil and pressure to lubricate
the bearings without floating the bearing in oil
oPiston pin bearings are splash lubricated by the connecting rod
oOil carry over is minimized since high-pressure oil is not forced into the
motor cavity
oEfficiency is increased since no power is required to drive an oil pump
