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 first 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 efficiency 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 flux, 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
affecting 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 flux,
• 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 fittings 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 fillings and particles can not be removed.
Mounting of SY/SZ 240-300-380: the required
bolt size is HM10. The minimum required flat
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 flat washer must be positioned
in place before shipping the unit with the
compressor installed.
Note
: for parallel assemblies see specific 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
fillings and particles can not be removed.
Brazing and soldering
Lock washer *
HM 10 Bolt *
Large flat *
1.06 inch washer
Steel mounting sleeve
Rubber grommet
Nut *
1.41 inch
Compressor base plate
* not supplied with compressor
43
FRCC.PC.003.A5.22
Application guidelines
