Ventilation
Before operating the unit, always check the function of the ventilation system and refrigerant
detectors used in the area where the compressor unit is located (machine room).
Rotating parts
WARNING
Safety guards, shields, barriers, covers, and protective devices must not be removed while the
compressor/unit is operating.
Vibration and noise
During operation, pay attention to the compressor unit process. Excessive vibration, unusual
sounds, etc. may indicate problems requiring your immediate attention.
Pressure
WARNING
A compressor unit comprises a pressurised system. Never loosen threaded joints while the system is
under pressure, and never open pressurised system parts.
Note:
Whenever a by-pass valve/safety valve has been activated, we recommend recalibrating
it. This must be carried out by competent personnel only. See also
EN 378
and existing national
legislation.
Cooling water system
WARNING
The recirculation water system may contain chemicals or biological contaminants, including legionella,
which can be harmful if inhaled or ingested. Water systems should only be operated with an effective
biological treatment programme.
Safety during maintenance and service
• Personnel must be competent according to national safety rules and regulations and perform
the maintenance work according to
EN 378
.
• Read the
section 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.
• Ensure that the motor cannot start up inadvertently.
• Ensure that there is no over-pressure and no refrigerant in the part to be dismantled. Close all
necessary stop valves.
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SAB 283-355 A-Frame OHU 6042 and OHU 7650 (including ATEX) Screw Compressor Unit
