24-EN
23-EN
– 12 –
EN
• The following checks shall be applied to installations using
fl
ammable refrigerants.
- The charge size is in accordance with the room size within
which the refrigerant containing parts are installed.
- The ventilation machinery and outlets are operating
adequately and are not obstructed.
- If an indirect refrigerating circuit is being used, the secondary
circuit shall be checked for the presence of refrigerant.
- Marking to the equipment continues to be visible and legible.
Markings and signs that are illegible shall be corrected.
- Refrigeration pipe or components are installed in a position
where they are unlikely to be exposed to any substance which
may corrode refrigerant containing components, unless the
components are constructed of materials which are inherently
resistant to being corroded or are suitably protected against
being so corroded.
9. Checks to electrical devices
• Repair and maintenance to electrical components shall include
initial safety checks and component inspection procedures.
• If a fault exists that could compromise safety, then no electrical
supply shall be connected to the circuit until it is satisfactorily
dealt with.
• If the fault cannot be corrected immediately but it is necessary
to continue operation, an adequate temporary solution shall be
used. This shall be reported to the owner of the equipment so
all parties are advised.
• Initial safety checks shall include;
- That capacitors are discharged to avoid possibility of sparking.
- That there no live electrical components and wiring are
exposed while charging, recovering or purging the system.
- That there is continuity of earth bonding.
10. Repairs to sealed components
• During repairs to sealed components, all electrical supplies
shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc.
• If it is absolutely necessary to have an electrical supply to
equipment during servicing, then a permanently operating form
of leak detection shall be located at the most critical point to
warn of a potentially hazardous situation.
• Particular attention shall be paid to the following to ensure that
by working on electrical components, the casing is not altered
in such a way that the level of protection is affected.
• This shall include damage to cables, excessive number of
connections, terminals not made to original speci
fi
cation,
damage to seals, incorrect
fi
tting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to
the point that they no longer serve the purpose of preventing
the ingress of
fl
ammable atmospheres.
• Replacement parts shall be in accordance with the
manufacturer’s speci
fi
cations.
NOTE
The use of silicon sealant may inhibit the effectiveness of some
types of leak detection equipment. Intrinsically safe components
do not have to be isolated prior to working on them.
11. Repair to intrinsically safe components
• Do not apply any permanent inductive or capacitance loads
to the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment in
use.
• Intrinsically safe components are the only types that can
be worked on while live in the presence of a
fl
ammable
atmosphere.
