APPLICATION GUIDELINES
38
FRCC.PC.007.B5.02
Compressor sound radiation For sound radiating from the compressor, the
emission path is airborne and the sound waves
are travelling directly from the machine in all
directions.
The Performer® SH scroll compressor is designed
to be quiet and the frequency of the sound gen-
erated is pushed into the higher ranges, which
not only are easier to reduce but also do not gen-
erate the penetrating power of lower-frequency
sound.
Use of sound-insulation materials on the inside
of unit panels is an eff ective means of substan-
tially reducing the sound being transmitted to
the outside. Ensure that no components capable
of transmitting sound/vibration within the unit
come into direct contact with any non-insulated
parts on the walls of the unit.
Because of the Performer®’s unique design of a
full-suction gas-cooled motor, compressor body
insulation across its entire operating range is pos-
sible. Acoustic hoods are available from Danfoss
as accessories. They have been developed to
meet specifi c extra low noise requirements. They
incorporate sound proofi ng materials and off er
excellent high and low frequency alternative.
These hoods are quick and easy to install and do
not increase the overall size of the compressors to
a great extend.
Refer to section "Running sound level" for sound
attenuation and code numbers.
SOUND AND VIBRATION MANAGEMENT
Vibration isolation constitutes the primary meth-
od for controlling structural vibration. Performer®
SH scroll compressors are designed to produce
minimal vibration during operations. The use of
rubber isolators on the compressor base plate or
on the frame of a manifolded unit is very eff ec-
tive in reducing vibration being transmitted from
the compressor(s) to the unit. Once the supplied
rubber grommets have been properly mounted,
vibrations transmitted from the compressor base
plate to the unit are held to a strict minimum. In
addition, it is extremely important that the frame
supporting the mounted compressor be of suf-
fi cient mass and stiff ness to help dampen any
residual vibration potentially transmitted to the
frame. For further information on mounting re-
quirements, please refer to the section on mount-
ing assembly.
Note: for parallel assemblies see specifi c recom-
mendations in Performer® SH parallel application
guidelines FRCC.PC.008 (rigid mounting).
The tubing should be designed so as to both re-
duce the transmission of vibrations to other struc-
tures and withstand vibration without incurring
any damage. Tubing should also be designed for
three-dimensional fl exibility. For more informa-
tion on piping design, please see the section enti-
tled “Essential piping design considerations”.
Gas pulsation
Mechanical vibrations
The Performer® SH scroll compressor has been
designed and tested to ensure that gas pulsation
has been optimised for the most commonly en-
countered air conditioning pressure ratio. On heat
pump installations and other installations where
the pressure ratio lies beyond the typical range,
testing should be conducted under all expected
conditions and operating confi gurations to en-
sure that minimum gas pulsation is present. If an
unacceptable level is identifi ed, a discharge muf-
fl er with the appropriate resonant volume and
mass should be installed. This information can be
obtained from the component manufacturer.
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