Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2020.10
Safety precautions
3. Safety precautions
This chapter provides general safety precautions for the equipment. Additional safety precautions
relating to specific tasks are given in specific documents.
The safety precautions are intended for all users.
3.1 Areas of application
3.1.1 Application of the screw compressor
To prevent unintentional application of the compressor, which could injure personnel or damage
equipment, the following must be observed:
• The compressor must only be used as a refrigeration compressor and within the operating
limits specified in the manuals or in a written agreement with Johnson Controls Denmark.
• The compressor must only be used with the refrigerant(s) and number of revolutions per
minute, shown on the compressor name plate. Other refrigerants must only be used in ac-
cordance with Johnson Controls Denmark's instructions. All other types of gas must only
be used with a written permission from Johnson Controls Denmark.
• The unit must not be installed in areas where the relative humidity (RH) may exceed
90%.
• Johnson Controls Denmark further accept no liability of any kind for damage to compres-
sor unit and plant parts caused by torsional oscillation, or the like, which is attributable to
built-in VSD solutions initiated by the customer after delivery.
• ATEX: The compressor is approved for application in potentially explosive atmospheres
provided it is fitted with explosion-proof equipment. If it is ATEX approved, there will be
an EX name plate fixed on the unit. Please note that special non-sparking tools must be
used for all maintenance work on the compressor.
The compressor must NOT be used:
• to evacuate the refrigeration plant of air and moisture
• to put the refrigeration plant under air pressure in view of a pressure testing
• as an air compressor.
3.1.2 Application of combustion engines
According to EN 378/ISO 5149, no other machinery should be installed in a refrigeration machine
room. Some refrigerant types may, to a certain extent, be absorbed by the fuel in a combustion
engine, and when the contaminated fuel reaches the fuel pumps, the refrigerant will “flash out”
(separate) and react on the increased temperature and pressure by creating acids, which will de-
stroy the pumps. However, check with the local authorities as exemptions to this rule may be
granted.
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