EN
EN - 12 EN - 13
warm area, a suitable re extinguishing system must be available. The re extinguisher
must be powder or CO2 in the vicinity of the lling area.
1.6 No sources of ignition
No person performing work on the refrigeration system that involves exposing any
piping that contains or has contained ammable refrigerant shall use any sources of
ignition in a way that could lead to a risk of re or explosion. All possible sources of
ignition, including cigarette smoking, should be kept away from the installation, repair,
removal and disposal site during which ammable refrigerant may be discharged into
the surrounding area. Prior to work, the area around the equipment must be inspect-
ed to ensure that there is no risk of re or ignition. "No smoking" signs must be posted.
1.7 Ventilated space
It must be ensured that the room is open or adequately ventilated before the system
is disrupted or work in warm environment is carried out. The ventilation intensity must
last for the duration of the work. Ventilation should safely disperse any discharged
refrigerant and preferably vent it to the atmosphere.
1.8 Inspection of cooling equipment
If electrical components are changed, these components must be suitable for this
purpose and meet the correct specications. The manufacturer's maintenance and
service instructions must always be followed. If in doubt, contact the manufacturer's
technical department for assistance.
The following checks must be carried out on installations containing ammable refrig-
erants:
• The volume of the ll is in accordance with the size of the room in which the parts
containing the refrigerant are installed;
• Ventilation units and outlets are working at full capacity and are not blocked;
• If an indirect refrigeration circuit is used, the second circuit must be checked for
the presence of refrigerant;
• The marking of the device must always be visible and legible; markings and marks
which are not legible must be xed;
• Refrigeration pipes or components are installed in locations where they are
unlikely to be exposed to any substances that may corrode refrigerant-containing
components unless the components are constructed of materials that are
intrinsically corrosion-resistant or are adequately protected against corrosion.
1.9 Inspection of electrical components
Repairs and maintenance of electrical components must include safety checks and
inspections of the components. If a malfunction occurs that could compromise safety,
then no power supply must be connected to the circuit until the fault has been satis-
factorily resolved. If the malfunction cannot be repaired immediately, it has to contin-
ue working; an appropriate temporary solution must be used. This must be reported to
the owner of the facility so that all parties know about it.
Initial safety checks must ensure:
• That the capacitors are discharged: this must be done in a safe way to avoid the
possibility of sparking;
• That no electrical components and wiring is exposed when lling, restoring and
cleaning the system;
• That grounding is not interrupted.
2. Repairs of sealed components
2.1 During the repair of sealed components, all electrical supply must be
disconnected from the equipment being worked on before the sealed covers