Chapter 15.0 Sound and Power Specifications
15.1 TTS300 and TTS400 Sound Power Measurements
The sound power levels on the TTS300 and TTS400 compressors are measured in compliance with ISO 9614-1 (1993)
and are given in decibels and in A-scale dB(A).
Three series of sound power measurements were performed on the unit while in two (2) different modes:
l For TTS300: 250kW (70 ton) refrigeration capacity
l 315kW (90 ton) refrigeration capacity
For TTS400:
l 420kW (120 ton) refrigeration capacity
l 525kW (150 ton) refrigeration capacity
15.1.1 Results
The sound power measured under each operational mode is presented in Table 15-1 Sound Power Measurements
for TTS300
l Table 15-1 Sound Power Measurements for TTS300
l Table 15-2 Sound Pressure Calculation for TTS300
l Table 15-4 Sound Power Measurements for TTS400
l Table 15-5 Sound Pressure Calculation for TTS400
These tables present the results of sound pressure calculations for various distances while the compressor is
installed on top of a building.
l The sound data below should be used as a guide only.
l The following sound measurements are based on a specific physical setup, such as suction/discharge
piping, evaporator and condensers, as well as specific pressure ratios. Any OEM system design would
not necessarily match these conditions.
l OEMs are responsible for their system sound level measurements and their published data.
Below are the results from “Sound Power Measurements"on a Turbocor TTS300 compressor.
Table 15-1 Sound Power Measurements for TTS300
Operation Mode Sound Power (A-Scale) dBA Sound Power (Linear Scale) dB Dominant Frequency
250 kW 81.5 81.5 1070 Hz
315 kW 86 85.5 1180 Hz
Table 15-2 Sound Pressure Calculation for TTS300
Distance in Relation to Compressor (Meters)
Operational Mode of Compressor (Capacity)
250 kW (70 Ton) dBA 315 kW (90 Ton) dBA
1 73.5 78.0
1.5 70.0 70.0
3 64 68.5
5 59.5 64.0
8 55.5 60.0
M-AP-001-EN Rev. S-9/8/2021 Page 91 of 136
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