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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 con-
tained 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 tak-
ing 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.
7. Ventilated area
Ensure that the area is in the open or that it is adequately venti-
lated 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.
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 fol-
lowed. If in doubt consult the manufacturer's technical depart-
ment for assistance.
The following checks shall be applied to installations using flam-
mable 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 cir-
cuit 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 com-
ponents are constructed of materials which are inherently resis-
tant to being corroded or are suitably protected against being so
corroded.
9. Checks to electrical devices
Repair and maintenance to electrical components shall include ini-
tial 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