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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 suciently far away from
the site of installation, repairing, remov-
ing 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.
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.
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
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.
9)Checks to electrical devices
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.
1)During repairs to sealed components,
all electrical supplies shall be disconnect-
ed 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 equip-
ment 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.
2)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 aected. 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 eectiveness of some types
of leak detection equipment. Intrinsically
safe components do not have to be
isolated prior to working on them.
7.Repairs to sealed components
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