Taurus Alpatec AC 293 KT Manuel D'utilisation page 26

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
tection equipment being used is suitable for use
with flammable refrigerants, i.e. nonsparking,
adequately sealed or intrinsically safe.
PRESENCE OF FIRE EXTINGUISHER
- If any hot work is to be conducted on the
refrigeration equipment or any associated parts,
propriate fire extinguishing equipment shall be
available to hand. Have a dry powder or CO 2
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 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 igarette 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 equip-
ment 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
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 atmo-
sphere.
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 as-
sistance.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.
CHECKS TO ELECTRICAL DEVICES
- Repair and maintenance to electrical compo-
nents 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 capac-
itors 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.
REPAIRS TO SEALED COMPONENTS
- 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 absolute-
ly 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.
- Particular attention shall be paid to the following
to ensure that by working on electrical compo-
nents, 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 connections, terminals not made to
original specification, damage to seals, incor-
rect fitting of glands, etc. Ensure that appara-
tus is mounted securely. Ensure that seals or
sealing materials have not degraded such that