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CAUTION
POE must be handled carefully and the proper
protective equipment (gloves, eye protection, etc.)
must be used when handling POE lubricant. POE
must not come into contact with any surface or
material that might be harmed by POE, including
without limitation, certain polymers (e.g. PVC/CPVC
and polycarbonate).
Oil Charges
The recommended oil charges for these compressors
are shown in Table 7.
Oil Management for Rack Applications
Copeland Scroll refrigeration compressors may be
used on multiple compressor parallel rack applications.
This requires the use of an oil management system
to maintain proper oil level in each compressor
crankcase. The sight glass connection supplied
can accommodate the mounting of the oil control
devices.
Unlike semi-hermetic compressors, scroll compressors
do not have an oil pump with accompanying oil pressure
safety controls. Therefore, an external oil level control
is required.
The Emerson OMB Oil Level Management Control
combines the functions of level control and timed
compressor shut-off should the level not come back to
normal within a set period of time. This device has been
found to provide excellent performance in fi eld tests on
Copeland Scroll compressors and is recommended for
parallel system applications.
Note: Emerson Climate Technologies' Application
Engineering Department should be contacted for
approved oil management systems.
Immediately after system start-up the oil reservoir level
will fl uctuate until equilibrium is reached. It is advisable to
monitor the oil level during this time to assure suffi cient
oil is available. This will prevent unnecessary trips of
the oil control system.
Note: If oil management problems are occuring
please refer to AE17-1320 or contact the Emerson
Climate Technologies, Inc. Application Engineering
Department.
Compressor Tubing and Mounting
Compressor mounting must be selected based on
application. Consideration must be given to sound
reduction and tubing reliability. Some tubing geometry
© 2014 Emerson Climate Technologies, Inc.
Printed in the U.S.A.
Application Engineering
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or "shock loops" may be required to reduce vibration
transferred from the compressor to external tubing.
Mounting for Rack Systems
For 1.3-7.5 HP compressors, specially designed
rubber grommets are available for refrigeration
scroll compressor applications. These grommets are
formulated from a durometer material specifi cally
designed for refrigeration applications. The durometer
limits the compressor motion, thereby minimizing
potential problems of excessive tubing stress. Suffi cient
isolation is provided to prevent vibration from being
transmitted to the mounting structure. This mounting
arrangement is recommended for multiple compressor
rack installations. See Figure 2A for a detail of this
mounting system.
NOTICE
The use of standard soft grommets is not recommended
for most refrigeration scroll rack installations. These
softer mounts allow for excessive movement that will
result in tube breakage, unless the entire system is
properly designed.
Condensing Unit Mounting
For 1.3-7.5
HP
applications, soft mounts are recommended. See
Figure 2B.
Tubing Considerations – Proper tube design must be
taken into consideration when designing the tubing
connecting the scroll to the remaining system. The
tubing should provide enough "fl exibility" to allow normal
starting and stopping of the compressor without exerting
excessive stress on the tube joints. In addition, it is
desirable to design tubing with a natural frequency away
from the normal running frequency of the compressor.
Failure to do this can result in tube resonance and
unacceptable tubing life. Figure 3 shows examples of
acceptable tubing confi gurations.
CAUTION
These examples are intended only as guidelines to
depict the need for fl exibility in tube designs. In order to
properly determine if a design is appropriate for a given
application, samples should be tested and evaluated for
stress under various conditions of use including voltage,
frequency, and load fl uctuations, and shipping vibration.
The guidelines above may be helpful; however, testing
should be performed for each system designed.
Starting Characteristics
Single-phase scroll compressors are designed with PSC
type motors and therefore will start without the need
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AE4-1317 R10
refrigeration scroll condensing unit
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