SOUND AND VIBRATION MANAGEMENT
Sound
Sound power level for MTZ
with R-404A, motor code 4
Te = 14°F,
TC = 113°F
* Sound data with hood are valid for
the Danfoss acoustic hood accessory.
Model
Acoustic hood accessory
code no.
MT/MTZ018 - 040
Acoustic hood for 1 cyl compressors
7755001
MT/MTZ044 - 081
Acoustic hood for 2 cyl compressors
7755002
MT/MTZ100 - 160
Acoustic hood for 4 cyl compressors
7755003
Sound power level at 50 Hz
dB(A)
Sound power level at 60 Hz
dB(A)
without
hood
with
hood*
without
hood
with
hood*
MTZ018
73
65
73
66
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
MTZ045
80
74
82
76
MTZ050
83
76
84
78
MTZ051
83
76
84
78
MTZ056
81
74
81
74
MTZ057
81
74
81
74
MTZ064
80
74
84
78
MTZ065
80
74
84
78
MTZ072
79
72
82
75
MTZ073
79
72
82
75
MTZ080
79
73
84
78
MTZ081
79
73
84
78
MTZ100
85
79
87
81
MTZ125
84
78
86
80
MTZ144
83
77
86
80
MTZ160
83
77
86
80
Running compressors cause sound and
vibration. These phenomena are closely
related.
Sound produced by a compressor is
transmitted in every direction in all me-
dia: ambient air, the mounting feet, the
pipework and the refrigerant in the pi-
pework.
The easiest way to reduce the sound
transmitted in ambient air is to fit a Dan-
foss acoustic hood accessory. Because
Maneurop® compressors are 100% suc-
tion 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 compressors mounted
inside, sound insulation of the plantrom
is an alternative to sound insulation of
the compressor.
Sound transmitted by mounting feet,
pipework and refrigerant should be re-
duced in the same way as vibration.
Please refer to the next section.