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Idiomas disponibles
Idiomas disponibles
A degree of ventilation shall continue during the period that the work is carried out.
The ventilation should safely disperse any released refrigerant and preferably expel it externally
into the atmosphere.
h) Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the
correct specification.
At all times the manufacturer's maintenance and service guidelines shall be followed.
If in doubt consult the manufacturer's technical department for assistance.
The following checks shall be applied to installations using flammable 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 compo-
nents 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 ma-
terials which are inherently resistant to being corroded or are suitably protected against being
so corroded.
i) Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and com-
ponent 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 solu-
tion 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: this shall be done in a safe manner 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.
23. REPAIRS TO SEALED COMPONENTS
a) 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 op-
erating form of leak detection shall be located at the most critical point to warn of a potentially
hazardous situation.
b) Particular attention shall be paid to the following to ensure that by working on electrical compo-
nents, 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 specification, damage to seals, incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the manufacturer's specifications.
The use of silicon sealant may inhibit the effectiveness of some types of leak detection equip-
ment. Intrinsically safe components do not have to be isolated prior to working on them.
24. 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 flammable
atmosphere.
The test apparatus shall be at the correct rating.
Replace components only with parts specified by the manufacturer.
Other parts may result in the ignition of refrigerant in the atmosphere from a leak.
25. CABLING
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check shall also take into account the effects of
aging or continual vibration from sources such as compressors or fans.
EN - 8
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