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available to hand. Have a dry powder or
CO2 fire extinguisher adjacent to the
charging area.
f) No ignition sources
No person carrying out work in relation to
a refrigerating 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.
g) 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.
h) Checks to the refrigerating 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 actual refrigerant charge 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; Refrigerating 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.
i) 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 there no live
electrical components and wiring are
exposed while charging, recovering or
purging the system; That there is
continuity of earth bonding.
7. 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 operating
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 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
7IMPORTANT SAFETY INSTRUCTIONS
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