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The following checks should 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 should be checked for the
presence of refrigerant.
• Marking to the equipment continues to be visible
and legible. Markings and signs that are illegible
should be corrected.
• Refrigeration pipe or components are installed
in a position where they are unlikely to be
exposed to any substance that may corrode
refrigerant-containing components, unless the
components are constructed of materials that
are inherently resistant to being corroded or are
suitably protected against being so corroded.
CHECKS TO ELECTRICAL DEVICES
Repair and maintenance to electrical components
should include initial safety checks and component
inspection procedures. If a fault exists that could
compromise safety, no electrical supply should 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 should be used. This should be
reported to owner of equipment so all parties are
advised.
Initial safety checks should ensure:
• Capacitors are discharged: this should be done in
a safe manner to avoid possibility of sparking.
• No live electrical components and wiring are
exposed while charging, recovering or purging the
system.
• There is continuity of earth bonding.
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SAFETY CONTINUED
REPAIRS TO SEALED COMPONENTS
• During repairs to sealed components, all
electrical supplies should 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 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, the casing is not altered in such a
way that the level of protection is affected. This
should include damage to cables, excessive
number of connections, terminals not made to
original specification, damage to seals, incorrect
fitting of glands, etc.
• 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 should be in
accordance with the manufacturer's specifications.
REPAIRS 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 live in the presence
of a flammable atmosphere. The test apparatus
should 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,
corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check
should also consider the effects of aging or continual
vibration from sources such as compressors or fans.
NOTE: Use of silicone 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.
0124 IH-11032
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