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If work involving heat is to be carried out on refrigeration equipment or its associated parts, suitable fire
protection equipment must be available within easy reach. A dry powder or CO2 fire extinguisher must
be available near the loading area.
5. Absence of ignition sources
No person carrying out work in connection with a refrigeration system which involves the exposure of
any piping system containing or having contained a flammable refrigerant shall use ignition sources in
such a way that they may result in a fire or explosion hazard. All possible sources of ignition, including
cigarette smoke, must be kept at a sufficient distance from the site of installation, repair, removal and
disposal, during which time flammable refrigerant may possibly be released into the surrounding space.
Before work begins, the area around the equipment must be inspected to ensure that there is no risk of
fire or ignition. No Smoking" signs must be posted.
6. Ventilated areas
Make sure the area is outdoors or sufficiently ventilated before entering the system or operating a hot
wok. A certain degree of ventilation must be maintained during the work. Ventilation must safely
disperse any refrigerant released and preferably expel it to the outside into the atmosphere.
7. Refrigeration equipment checks
When electrical components are modified, they must be suitable for their intended use and meet the
correct specification. At all times, the manufacturer's maintenance and service guidelines must be
followed. If in doubt, consult the manufacturer's technical service for assistance.
The following controls must be applied to installations using flammable refrigerants :
- the size of the charge as a function of the size of the room in which the rooms containing the
refrigerant are installed ;
- machines and ventilation outlets are working properly and are not obstructed.
8. Electrical device checks
Repair and maintenance of electrical components should include initial safety checks and component
inspection procedures. If there is a defect that could compromise safety, no electrical supply shall be
connected to the circuit until it has been satisfactorily remedied. If the defect cannot be rectified
immediately but it is necessary to continue operation, a suitable temporary solution must be used. This
situation shall be reported to the owner of the equipment so that all parties are informed.
Initial security checks should include :
- that the capacitors are discharged: this must be done in a safe way to avoid any possibility of sparks ;
- that no live electrical components or wiring are exposed when charging, recovering or purging the
system ;
- that there is continuity of grounding.
9. Repairs to hermetic components
When repairing sealed components, all power supplies must be disconnected from the equipment being
worked on before any removal of sealed covers, etc.
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