Publicité
2.2.2 Work procedure
Work shall be undertaken under a controlled procedure so as to
minimize the risk of a flammable gas or vapor being present while
the work is being performed.
2.2.3 General work area
All maintenance staff and others working in the local area shall be
instructed on the nature of work being carried out. Work in confined
spaces shall be avoided. The area around the work space shall be
sectioned off. Ensure that the conditions within the area are safe by
control of flammable material.
2.2.4 Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector
prior to and during work, to ensure that the technician is aware of
potentially flammable atmospheres. Ensure that the leak detection
equipment being used is suitable for use with flammable refrigerants,
i.e. no sparking, adequately sealed or intrinsically safe.
2.2.5 Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or
any associated parts, appropriate fire extinguishing equipment shall
be available to handy area. Have a dry powder or CO2 fire
extinguisher adjacent to the charging area.
2.2.6 No ignition sources
No person carrying out work in relation to a refrigeration system
which involves exposing any pipe work that contains or has contained
flammable refrigerant shall use any sources of ignition in such a
manner that it may lead to the risk of fire or explosion. All possible
ignition sources, including cigarette smoking, should be kept
sufficiently far away from the site of installation, repairing, removing
and disposal, during which flammable refrigerant can possibly be
released to the surrounding space. Prior to work taking place, the
area around the equipment is to be surveyed to make sure that there
are no flammable hazards or ignition risks. "No Smoking" signs shall
be displayed.
2.2.7 Ventilated area
Ensure that the area is in the open air 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.
06
2.2.8 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.
2.2.9 Check electrical devices
Repair and maintenance to electrical components shall include initial
safety checks and component inspection procedures. If a fault exists
that could endanger 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:
-those 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.
Install the unit in rooms where exceed 9 m².
Do not install the unit in a place where inflammable gas
WARNING
may leak.
The manufacturer may provide other suitable example or
may provide additional information about the refrigerant
odour.
NOTE!
EN
07
Publicité
