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EN
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qualifications for dealing with refrigeration systems as recognized by this
industry. If other technicians are needed to maintain or repair the appliance,
they should be supervised by a person who holds the qualifications for
working with flammable refrigerants.
2. REPAIRS TO SEALED COMPONENTS
• During repairs to sealed components, all electrical supplies should be
disconnected from the equipment being worked on prior to any removal of
sealed covers, etc. If it is absolutely necessary to have an electrical supply to
equipment during servicing, then a permanently operating form of leak
detection should be located at the most critical point to warn of a potentially
hazardous situation.
• Particular attention should be paid to the following to ensure that by
working on electrical components, casings will not be altered in such a way
that will affect the level of protection. Dangers include damage to cables,
excessive number of connections, terminals not made to original
specification, damage to seals, incorrect fitting of glands, etc. Ensure that
electrical 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 substances. Replacement parts should
always be in accordance with manufacturer specifications.
• NOTE: The use of silicon sealant may inhibit the effectiveness of some types
of leak detection equipment. Intrinsically safe components do not have to be
isolated prior to working on them.
3. REPAIR TO INTRINSICALLY SAFE COMPONENTS
• Do not apply any permanent inductive or capacitance 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
in the presence of a flammable materials. The test apparatus should yield an
appropriate 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.
4. CABLING
• Check that cabling will not be subject to wear, corrosion, excessive pressure,
vibration, sharp edges, or any other adverse environmental effects. The
check shall also account for the effects of aging or continual vibration from
sources such as compressors or fans.
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