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Idiomas disponibles
Specialist's
anual
Aptitude requirement for maintenance man
(repairs should be done only be specialists).
a.Any person who is involved with working on or
breaking into a refrigerant circuit should hold
acurrent valid certificate from an industry-accred-
ited assessment authority, which authorises their
competence to handle refrigerants safely in
accordance with an industry recognised
assessment specification.
b.Servicing shall only be performed as recommend-
ed by the equipment manufacturer. Maintenance
and repair requiring the assistance of other
skilled personnel shall be carried out under the
supervision of the person competent in the use of
flammable refrigerants.
Safety preparation work
The maximum refrigerant charge amount is shown
on the following table a.
(Note: Please refer to the nameplate for the
charging quantity of R290).
Room area (m
2
)
4
Maximum charge (kg)
<0.152
table a - Maximum charge (kg)
Prior to beginning work on systems containing
flammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised. For
repair to the refrigerating system, the following
precautions shall be complied with prior to conduct-
ing work on the system.
● Work procedure
Work shall be undertaken under a controlled
procedure so as to minimised the risk of a flammable
gas or vapour being present while the work is being
performed.
● 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.
● 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 toxic or
flammable atmospheres. Ensure that the leak
detection equipment being used is suitable for use
with all applicable refrigerants, i.e. non-sparking,
adequately sealed or intrinsically safe.
● Presence of fire extinguisher
lf any hot work is to be conducted on the refrigera-
tion equipment or any associated parts, appropriate
fire extinguishing equipment shall be available to
hand. Have a dry powder or CO2 fire extinguisher
adjacent to the charging area.
● No ignition sources
No person carrying out work in relation to a
refrigeration system which involves exposing any
pipe work 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 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.
● Ventilated area
Ensure that the area is in the open or that it is
11
15
adequately ventilated before breaking into the
0.225
0.304
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.
● 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. lf in doubt, consult the manufacturers'
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;
--- 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
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