Tarrington House MAC2320C Gebrauchsanweisung Seite 11

use with flammable refrigerants, i.e. non-sparking,
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, appropriate fire
extinguishing equipment shall be available to hand.
Have a dry powder or CO
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
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.
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.
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 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
fire extinguisher adjacent
2
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 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.
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 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.
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 connections, terminals
not made to original specification, damage to seals,
incorrect fitting of glands, etc.
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not
degraded such that they no longer serve the purpose
of preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the
manufacturer's specifications.
NOTE: The use of silicon sealant may inhibit the
effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have
to be isolated prior to working on them.
REPAIR TO INTRINSICALLY SAFE COMPONENTS
Do not apply any permanent inductive or capacitance
loads to the circuit without ensuring that this will not
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GB