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if maintenance work must continue, an appropriate temporary solution must
be found. This must be reported to the equipment's owner so that all persons
concerned are made aware.
•
The repair and maintenance of electric components must include the following
initial safety checks:
-
the capacitors are discharged: this must be carried out safely to prevent all risks
of ignition;
-
no electric component or live wiring is exposed while charging, overhauling or
draining the system;
-
the system must be grounded at all times.
Repair of insulated components
•
When repairing insulated components, all power sources must be disconnected
from the equipment on which the work is being carried out before removing the
insulating cover, etc. If the equipment must be powered during maintenance work,
a leak detector must continuously monitor for leaks at the most critical point in
order to report any potentially hazardous situation.
•
Particular attention must be paid to the following points to ensure that, when
performing work on the electric components, the housing is not altered to the
point of affecting the protection rating. This includes damaged wires, an excessive
number of connections, terminals that do not comply with the original specifications,
damaged seals, incorrect installation of the cable glands, etc.
•
Make sure that the appliance is properly fixed.
•
Make sure that the seals or insulating materials are not deteriorated to the point
that they no longer prevent a flammable atmosphere from penetrating the circuit.
Spare parts must be compliant with the manufacturer’s specifications.
Repair of intrinsically safe components
•
Do not apply any permanent electric capacitance or induction charge to the circuit
without checking that it does not exceed the allowed voltage and intensity for the
equipment being used.
•
Typically safe components are the only types on which work can be carried out in
the presence of a flammable atmosphere when live. The test appliance must fall
under a suitable classification.
•
Only replace components with parts specified by the manufacturer. Other parts
could cause the refrigerant to leak and ignite in the atmosphere.
Wiring
•
Check that the wiring shows no signs of wear, corrosion, excessive pressure,
vibration, cutting edges or any other detrimental environmental effect. The check
must also take into account the effects of ageing or continuous vibrations caused
by sources such as compressors or fans.
Detection of flammable refrigerant
•
Under no circumstances must potential ignition sources be used to search for or
detect refrigerant leaks. A halide torch (or any other detector using a naked flame)
must not be used.
•
The following leak detection methods are considered to be acceptable for all
cooling systems.
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