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pipework 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, removal, 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.
vii. 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.
viii. 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 of the equipment continues to be visible and legible. Markings and signs that are
illegible shall be corrected;
--Refrigeration pipes 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 that are inherently resistant to being corroded or are
suitably protected against being so corroded.
ix. 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 capacitor is discharged: this shall be done in a safe manner to avoid the 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 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, an excessive number of connections, terminals not made to
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