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b) Work procedure
Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable
gas or vapour being present while the work is being performed.
c) 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 workspace shall be sectioned off.
Ensure that the conditions within the area have been made safe by control of flammable material.
d) Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to
ensure the technician is aware of potentially flammable atmospheres.
Ensure that the leak detection equipment being used is suitable for use with flammable refriger-
ants, i.e. non-sparking, adequately sealed or intrinsically safe.
e) Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts, appro-
priate fire extinguishing equipment shall be available at 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 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.
g) Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking into the sys-
tem 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 refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the cor-
rect 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 obstruct-
ed; 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.
i) Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and compo-
nent 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.
EN - 7
AQUARIA S1 20/24 P
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