22
SOUND AND VIBRATION MANAGEMENT
Compressor
model
Sound power level*
at 50 hz dB(A)
Sound power level*
at 60 Hz dB(A)
Acoustic
hood
code no.
without hood with hood without hood with hood
NTZ048 72 65 75 68
7755001
NTZ068 70 64 74 68
NTZ096 78 71 82 74
7755002NTZ108 76 69 80 75
NTZ136 77 71 80 75
NTZ215 84 78 88 81
7755003
NTZ271 84 78 88 81
(*) Operating conditions: R404A, Evap. temp.: -35°C, Cond. temp.: 40°C, 400 V / 50Hz
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 ambi-
ent air is to t an acoustic hood acces-
sory. Because Maneurop® NTZ com-
pressors are 100% suction gas cooled
and require no external cooling they
can be insulated or enclosed in a sound
proo ng material lined compartment.
Sound transmitted by mounting feet,
pipework and refrigerant should be
treated the same way as vibration (see
next section).
Sound Compressors in operation are one of
the sources of sound and vibration in
a refrigeration system. Both phenom-
ena are closely related.
Vibration The mounting grommets delivered
with the compressor should always
be used. They will largely attenuate
the compressor vibration transmit-
ted to the base frame. These rubber
grommets have been selected and
calculated in accordance with the vi-
bration frequencies that are typical for
the compressor. For that reason other
grommet types or brands shall not be
used.
The base on which the compressor is
mounted should be su ciently rigid
and of adequate mass to ensure the
full e ectiveness of the mounting
grommets. The compressor should
never be rigidly mounted to the base
frame otherwise high vibration trans-
mission would occur and the service
life reduced. Suction and discharge
lines must have adequate exibility in
3 planes. Eventually vibration absorb-
ers may be required.
Vibration is also transmitted by the
refrigerant gas. Maneurop® NTZ com-
pressors have built-in mu ers to re-
duce pulsation. To further reduce vi-
bration an extra discharge line mu er
can be installed.
To Next Page
Loading...
Need help?
General
