Danfoss Maneurop NTZ Series Application Guidelines

Application guidelines
21FRCC.PC.002.A4.22
Sound and vibration management
Vibration
Sound
The mounting grommets delivered with the com-
pressor should always be used. They will largely
attenuate the compressor vibration transmitted
to the base frame. These rubber grommets have
been selected and calculated in accordance with
the vibration 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 transmission would occur and the
service life reduced. Suction and discharge lines
must have adequate exibility in 3 planes. Even-
tually vibration absorbers may be required.
Vibration is also transmitted by the refrigerant
gas. Maneurop® NTZ compressors have built-in
muers to reduce pulsation. To further reduce
vibration an extra discharge line muer can be
installed.
Compressors in operation are one of the sources
of sound and vibration in a refrigeration system.
Both phenomena are closely related.
Sound produced by a compressor is transmit-
ted 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 t
an acoustic hood accessory. Because Maneurop®
NTZ compressors are 100% suction gas cooled
and require no external cooling they can be in-
sulated 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).
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 82 74 85 77
7755002NTZ108 76 69 80 75
NTZ136 77 71 80 75
NTZ215 86 80 88 81
7755003
NTZ271 86 80 88 81
(*) Operating conditions: R404A, Evap. temp.: -31°F, Cond. temp.: 104°F

Danfoss Maneurop NTZ Series Specifications

General

Brand	Danfoss
Model	Maneurop NTZ Series
Category	Air Compressor
Language	English