Emerson ZB Copeland Scroll User Manual

2
ZB Series
Description of 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 compressor 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. In 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 bearings 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.
All specifications in this catalogue are subject to change without
notice.
2
1
Crankshaft
Axial compliance
Radial compliance
Fixed scroll
Orbiting
scroll
Discharge
Suction
Figure 1
Figure 2

Emerson ZB Copeland Scroll Specifications

General

Brand	Emerson
Model	ZB Copeland Scroll
Category	Compressor
Language	English