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2.2.6 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.
2.2.7 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.
2.2.8 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 components
are constructed of materials which are inherently resistant to being
corroded or are suitably protected against being so corroded.
2.2.9 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:
-those 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.
WARNING!
Appliance shall be installed, operated and stored in a
room with a floor area larger than 4㎡/43sq.ft.
Do not install the unit in a place where inflammable
gas may leak.
NOTE! The manufacturer may provide other suitable
example or may provide additional information about
the refrigerant odor.
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