Features - Emerson COPELAND F Series User Manual

Scroll compressor features
Dual compliance
Compliance means sealing between the orbiting and fixed scroll involutes. Dual compliance means the
sealing is on both the axial and radial directions. This prevents refrigerant leak back across successive
scroll pressure pockets. Compliance design also allows the scroll involutes to separate in both the radial
and axial directions. This allows debris or liquid refrigerant to pass through the scroll involutes without
damaging the compressor. Benefits of dual compliance are:
• Increased efficiency
• Better liquid handling capability
• Better handling of debris
Scroll wear -in
The scroll involutes of Copeland Scroll™ compres-
sor wear-in, rather than wear-out. So unlike in other
compressor technologies among similar categories,
there is no constant degradation of performance
with time due to wear-out.
Lower sound, vibration and pulsation
The compression process in a scroll set is symmetrical and continuous. This inherently reduces the
sound, vibration and pulsation. This eliminates the need for use of vibration absorbers and suction or
discharge mufflers in most of the applications. Further, ZB scroll compressors are engineered to
produce smooth sound spectrum which improves the quality of sound.
Unloaded start
The scroll sets separate at the instant of compressor shutdown. This allows the scroll set internal
pressures to equalize on compressor stops. In addition to this, the scroll sets are not engaged at the
instant of starting. Scroll sets engage only after few milliseconds of startup. This allows easier startup
of ZB scroll compressors. Due to this design feature, typically a start assist kit is not required even on
single phase compressors.
DU bearings
A space age bearing material comprising of porous bronze with
PTFE-lead overlay. These bearings are used in ZB scroll
compressors in the scroll drive and main bearings. DU bear-ings
work with exceptionally low friction between the load bearing
surfaces. In addition, DU bearings can operate safely for a short
time with loss of lubrication. This situations could happen on
compressor applications due to oil pump out during a flooded
start or heavy oil dilution after a defrost cycle.
Discharge
Fixed
scroll
Orbiting
scroll
Radial compliance
Crankshaft
Figure 1
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2
Figure 2
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