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piping containing or having contained flammable refrigerant must not use an ignition source
liable to create a risk of fire or explosion. All possible sources of ignition, including cigarettes,
should be kept sufficiently far from the location of installation, repair, removal and disposal,
during which flammable refrigerant may possibly be released into the surrounding space.
Before starting work, the area around the equipment must be examined to ensure that there is
no danger of flammability or risk of ignition. "No smoking" signs must be prominently displayed.
1.7.
Ventilated work area:
Make sure the area is open or properly ventilated before entering the system or performing hot
work. Some ventilation must be maintained during the work. Aeration should safely disperse any
released refrigerant and preferably expel it out into the atmosphere.
1.8.
Refrigeration equipment checks:
When electrical components are replaced, they must be fit for purpose and to appropriate
specifications. Always follow the manufacturer's guidelines for maintenance and service. If in
doubt, consult the manufacturer's technical department for assistance.
The following controls must be applied to installations using flammable refrigerants: the load
corresponds to the dimensions of the room in which the rooms containing refrigerant are
installed; machines and air vents are working properly and are not blocked; if an indirect
refrigeration circuit is used, the secondary circuit must be checked in order to detect the
presence of refrigerant; the marking affixed to the equipment remains visible and legible.
Illegible markings and signs must be corrected; refrigeration pipes or components are installed
in a position where they are not likely to be exposed to a substance which could corrode
components containing refrigerant.
1.9.
Checks of electrical devices:
Repair and maintenance of electrical components should include initial safety checks as well as
component examination procedures. In the event of a fault that could compromise safety, no
power supply should be connected to the circuit until the problem has been satisfactorily
resolved. If the fault cannot be corrected immediately but it is necessary to continue use, a
suitable temporary solution should be used. This problem should be reported to the owner of
the equipment so that all parties are aware.
The initial safety checks should include: discharging the capacitors: this should be done safely
in order to avoid any possibility of sparking; ensure that no live electrical components or wiring
are exposed when charging, recovering or purging the system; the presence of earth continuity.
2.
REPAIRS OF SEALED COMPONENTS
2.1.
When repairing sealed components, all power supplies should be disconnected from the
equipment being used before any removal of sealed covers, etc. If it is absolutely necessary to
have a power supply to the equipment during repair work, a continuously functional leak
detection technique must be at the most critical point to report any potentially hazardous
situation.
2.2.
Particular attention must be paid to the following points in order to ensure that the work
carried out on the electrical components does not modify the case in such a way as to impair
the level of protection. This includes damaged cables, excessive number of connections,
terminals not meeting original specifications, damaged gaskets, improper mounting of cable
glands, etc.
Make sure the device is mounted correctly. Make sure that the gaskets or sealing materials
have not degraded so that they no longer serve to prevent the infiltration of flammable
atmospheres. Replacement parts must conform to the manufacturer's specifications.
NOTE: The use of a silicone sealant may affect the effectiveness of
some types of leak detection equipment. Intrinsically safe components do not necessarily have
to be isolated before starting work.
3.
REPAIR OF INTRINSICALLY SAFE COMPONENTS
Do not apply any permanent inductive or capacitive load to the circuit without ensuring that it will
not exceed the allowable voltage and current for the equipment being used. Intrinsically safe
components are the only types that can be worked on when energized in a flammable
atmosphere. The test apparatus must be properly calibrated. Replace components only with
parts specified by the manufacturer. Any other part may cause refrigerant to ignite in the
atmosphere by leaking.
4.
WIRING
Make sure that the wiring will not be subjected to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse effect on the environment. The verification should
also take into account the effects of aging or continual vibration from sources such as
compressors or fans.
5.
DETECTION OF FLAMMABLE REFRIGERANTS
Under no circumstances should potential ignition sources be used to search for or detect
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