Application guidelines
57
FRCC.PC.023.A7.22
Single compressors
Sound and vibration management
If vibrations occurs at some typical frequencies
of the VZH variable speed compressor system,
design must be checked: frame, piping, pipes
using cushioned clamps. But if some frequencies
remain showing unacceptable vibration level,
speed by-pass is adjustable in the frequency
converter, in order to avoid some frequency
ranges. Four by-pass ranges are adjustable, and
settings can be done in parameters 4.6x.
Speed by-pass
Gas pulsation
The VZH scroll compressor has been designed
and tested to ensure that gas pulsation has been
optimized for the most commonly encountered
air conditioning pressure ratios. 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 configurations to
ensure that minimum gas pulsation is present. If
an unacceptable level is identified, a discharge
muffler with the appropriate resonant volume
and mass should be installed. This information
can be obtained from the component
manufacturer.
