Application guidelines
29
FRCC.PC.004.A9.22
Sound and vibration management
Running compressors cause sound and vibration.
Both phenomena are closely related.
Sound produced by a compressor is transmitted
in every direction by the ambient air, the
mounting feet, the pipework and the refrigerant
in the pipework.
The easiest way to reduce the sound transmitted
through ambient air is to fit a Danfoss acoustic
hood accessory.
Because Maneurop® compressors are 100%
suction gas cooled, and require no body
cooling, they can be insulated. Values for the
sound reduction achieved with acoustic hoods
are shown also in the table below. For inside
mounted compressors, sound insulation of the
plantroom is an alternative to sound insulation of
the compressor.
Sound transmitted by mounting feet, pipework
and refrigerant should be treated the same way
as for vibration. Please refer to the next section.
Sound
Vibration
The mounting grommets delivered with the
compressor should always be used. They reduce
the vibration transmitted by the compressor
mounting feet to the base frame.
The base on which the compressor is mounted
should be sufficiently rigid and of adequate mass
to ensure the full effectiveness of the mounting
grommets.
The compressor should never be directly
mounted to the base frame without the
grommets, otherwise high vibration transmission
would occur and the compressor service life
reduced. Suction and discharge lines must
have adequate flexibility in 3 planes. Eventually
vibration absorbers may be required.
Care must be taken to avoid tubing having
resonant frequencies close to those of the
compressor frequency.
Vibration is also transmitted by the refrigerant
gas. Maneurop® compressors have built in
mufflers to reduce this vibration.
To further reduce vibration an extra muffler can
be installed.
Note: Maneurop® MT & MTZ compressors have
been designed and qualified for stationary
equipment used in A/C and Refrigeration
applications. Danfoss doesn’t warrant these
compressors for use in mobile applications, such
as trucks, railways, subways, etc...
Sound power level at 50 Hz
dB(A)
Sound power level at 60 Hz
dB(A)
Acoustic hood
accessory
without hood
with hood*
without hood
with hood*
MTZ018
73
65
73
66
120Z0575
MTZ022
74
68
77
71
MTZ028
71
64
73
66
MTZ032
71
64
73
66
MTZ036
70
64
76
69
MTZ040
70
65
72
67
MTZ044
80
74
82
76
120Z0576
MTZ050
83
76
84
78
MTZ056
81
74
81
74
MTZ064
80
74
84
78
MTZ072
79
72
82
75
MTZ080
79
73
84
78
MTZ100
85
79
87
81
120Z0577
MTZ125
84
78
86
80
MTZ144
83
77
86
80
MTZ160
83
77
86
80
Sound power level for MTZ with R404A, motor code 4 Te = 14°F, Tc= 113°F
* Sound data with hood are valid for the Danfoss acoustic hood accessory.
As first approach, use these figures with -3 dBA reduction for MT models applied with R22.
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