Avalla X-95 Manual página 11

must 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 must 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 must
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 must be fit for the purpose
and to the correct specification. At all times the manufacturer's maintenance
and service guidelines must be followed. If in doubt consult the manufacturer's
technical department for assistance. The following checks must be applied to
installations using flammable refrigerants:
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The charge size is in accordance with the room size within which the
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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 must be
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checked for the presence of refrigerant.
Marking to the equipment continues to be visible and legible. Markings and
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signs that are illegible must 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 corroded.
Checks to Electrical Devices
Repair and maintenance to electrical components must include initial safety
checks and component inspection procedures. If a fault exists that could
compromise safety, then no electrical supply must 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 must be used.
This must be reported to the owner of the equipment, so all parties are advised.
Initial safety checks must include:
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Those capacitors are discharged: this must be done in a safe manner to avoid
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possibility of sparking.
That no live electrical components or wiring are exposed while charging,
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recovering or purging the system.
That there is continuity of earth bonding.
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