Operating manual - SAB 120-151 A-frame (including ATEX)
008668 en 2019.08
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Safety precautions
Cooling water system
Warning!
The recirculation water system may contain chemicals or biological contaminants, including le-
gionella, which can be harmful if inhaled or ingested. Water systems should only be operated with
an effective biological treatment programme.
4.3 Safety during maintenance and service
• Personnel must be competent according to national safety rules and regulations and per-
form the maintenance work according to EN 378.
• Read chapter 4. Safety precautions before opening the compressor and other parts of the
refrigeration plant.
• It is recommended to remove all main fuses. Switch off all electric components on the
compressor/unit before starting the dismantling/servicing process and lock the main
switch.
• Make sure that the motor cannot start up inadvertently.
• Make sure that there is no over-pressure and no refrigerant in the part to be dismantled.
Close all necessary stop valves.
• Use the prescribed tools, and check that they are properly maintained and in good work-
ing condition. In explosion-proof areas, use tools suited for this specific purpose.
• Use only Johnson Controls Denmark original spare parts; other parts may impair the
safety of the compressor/unit.
• When performing maintenance, the main switch must be locked.
• Use gloves and protective goggles, and make sure to have a gas mask close at hand. Also
use electrical protection equipment and tools suited for electrical operation purposes.
ATEX:
• All parts should be electrically conductive to avoid sparking when static electricity builds
up.
• Materials should only contain a limited percentage of light metals.
• Original parts supplied by Johnson Controls Denmark must not be replaced by unspecified
parts that are not ATEX approved.
Warning!
On ATEX-executions, the limits in Table 4 must always be respected.
Temp. class Max. surface
temp.
Max. temperature of oil to
shaft seal
Min. ignition temperature
of oil
T1 450°C 380°C 500°C
T2 300°C 230°C 350°C
T3 200°C 130°C 250°C
T4 135°C 65°C 185°C
T5 100°C 30°C 150°C
T6 85°C 15°C 135°C
Table 4: Temperature classes - screw compressors
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