Operating manual- SAB 355 (including ATEX)
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Safety precautions
4.8 Sound and noise data
4.8.1 Noise data
Noise data is stated in:
SWL:
A-weighted sound power level
SPL:
A-weighted sound pressure level, in free field over reflecting plane (1 m distance).
• Noise data is based on measurements according to ISO 9614-2.
• The stated SPL values are calculated using the formula 8.3 in ISO 3744.
• The stated values are for a complete unit operating in 100% capacity.
4.8.2 Noise data for SAB 355
Evaporating temperature, TE -15°C
Condensing temperature, TC
+35°C
Refrigerant R717/HCFC/HFC
Speed
2950 rpm
For 60 Hz-driven compressors, add +2 dBA to the stated levels.
Type of unit
SWL SPL
SAB 355 S 112 89
SAB 355 L 112 89
SAB 355 E 112 89
SAB 355 X 112 89
Table 5: Noise data
Noise data for other operating conditions can be provided by Johnson Controls Denmark on
request.
Note:
• The actual SPL value on site will be between the stated SPL and SWL depending on the
acoustic environment in the machine room.
• In a typical machine room without any noise absorbing materials, the actual SPL will be
approximately 14 dBA higher than the stated SPL (free field value).
• Checking the actual SPL must therefore always be accompanied by measurements of the
acoustic environment of the machine room. Alternatively, ISO 9614-2 could be followed
at the installation site to obtain SWL comparable values.
• Be aware of local/national requirements for the use of ear protection. Generally, it is rec-
ommended to use ear protection in machine rooms.
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