User Guide

Application guidelines
45AB237986441643en-US0701
Installation
Compressor holding charge Each compressor is shipped with a nominal dry
nitrogen holding charge between 4 and 10 psi
and is sealed with elastomer plugs.
Before the suction and discharge plugs are
removed, the nitrogen holding charge must be
released via the suction schrader valve to avoid
an oil mist blowout. Remove the suction plug
rst and the discharge plug afterwards. The plugs
shall be removed only just before connecting the
compressor to the installation in order to avoid
moisture from entering the compressor. When
the plugs are removed, it is essential to keep the
compressor in an upright position so as to avoid
oil spillage.
System cleanliness The refrigerant compression system, regardless
of the type of compressor used, will only provide
high eciency and good reliability, along with a
long operating life, if the system contains solely
the refrigerant and oil it was designed for. Any
other substances within the system will not
improve performance and, in most cases, will be
highly detrimental to system operations.
The presence of non-condensable substances
and system contaminants, such as metal
shavings, solder and ux, have a negative
impact on compressor service life. Many of
these contaminants are small enough to
pass through a mesh screen and can cause
considerable damage within a bearing assembly.
The use of highly-hygroscopic polyester oil in SZ
compressors requires that the oil be exposed to
the atmosphere just as little as possible.
System contamination is one of main factors
aecting equipment reliability and compressor
service life. It is important therefore to take
system cleanliness into account when assembling
a refrigeration system.
During the manufacturing process, circuit
contamination may be caused by:
• Brazing and welding oxides,
• Filings and particles from the removal of burrs in
pipe-work,
• Brazing ux,
• Moisture and air.
Consequently, when building equipment
and assemblies, the precautions listed in the
following paragraphs must be taken.
Tubing Only use clean and dehydrated refrigeration
grade copper tubing. Tube cutting must be
carried out so as not to deform the tubing
roundness and to ensure that no foreign debris
remains within the tubing. Only refrigerant-grade
ttings should be used and these must be of
both a design and size to allow for a minimum
pressure drop through the completed assembly.
Follow the brazing instructions next pages.
Never drill holes into parts of the pipe-works
where llings and particles can not be removed.
Mounting of SY 240-300-380: the required bolt
size is HM10. The minimum required at washer
outside diameter is 20 ft.lbs. Mounting bolts
must be tightened to a torque of 30 ft.lbs. These
bolts and washers are not supplied with the
compressor.
Note: The large at washer must be positioned
in place before shipping the unit with the
compressor installed.
Note: for parallel assemblies see specic recommendations in Danfoss parallel application guidelines,
FRCC.PC.005.
Do not blend the compressor discharge or
suction lines or force system piping into the
compressor connections, because this will
increase stresses that are a potential cause of
failure. Recommended brazing procedures and
material, are described on following page. Never
drill holes into parts of the pipe-works. Where
llings and particles can not be removed.
Brazing and soldering
Lock washer *
HM 10 Bolt *
Large at *
1.06 inch washer
Steel mounting sleeve
Rubber grommet
Nut *
1.41 inch
Compressor base plate
* not supplied with compressor