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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 re-
leased refrigerant and preferably expel it exter-
nally into the atmosphere.
INSPECTIONS OF 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 installa-
tions 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 oper-
ating 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 ex-
posed 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 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 cir-
cuit 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 equip-
ment 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
24
SERVICE GUIDE
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 per-
manently operating form of leak detection shall be
located at the most critical point to warn of a poten-
tially 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 orig-
inal 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 ef-
fectiveness of some types of leak detection equip-
ment. 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 capaci-
tance loads to the circuit without ensuring that this
will not exceed the permissible voltage and current
permitted for the equipment in use.
▪ Intrinsically safe components are the only types
that can be worked on while live in the presence of
a flammable atmosphere. The test apparatus shall
be at the correct rating.
▪ Replace components only with parts specified by
the manufacturer.
▪ Other parts may result in the ignition of refrigerant
in the atmosphere from a leak.
CABLING
▪ Check that cabling will not be subject to wear, cor-
rosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects.
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