essentiel b ECMR 142 Precauciones De Uso página 9

are no flammable hazards or ignition risks. "No Smoking" signs shall be displayed.
DD.4.7 Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking into
the system or conducting any hot work. 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.
DD.4.8 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 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.
DD.4.9 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: this shall be done in a safe manner to avoid possibility
of sparking;
• that no live electrical components and wiring are exposed while charging, recovering
or purging the system;
• that there is continuity of earth bonding.
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DD.5 Repairs to sealed components
DD.5.1 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.
DD.5.2 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
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.
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.
DD.6 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.
DD.7 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 ageing or continual vibration from sources such as compressors
or fans.
DD.8 Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for
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