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equipment to ensure there are no flammable hazards or ignition risks. 'No Smoking'
signs must be displayed in the working area.
● Before breaking into the system or conducting hot work, ensure the area is in the open
and properly ventilated, so any released refrigerant can be safely dispersed.
● When changing electrical components, ensure they are fit for purpose and have the
correct specification.
● Follow the below maintenance and service guidelines. If in doubt, contact the
manufacturer's technical department for assistance.
a) Charge size must be appropriate for the room size where refrigerant-containing
parts are installed.
b) Ventilation machinery and outlets must be functioning properly and not be
obstructed.
c) If an indirect refrigerating circuit is used, check the secondary circuit for a
refrigerant.
d) Equipment markings should be visible and legible. Illegible markings and signs
must be corrected.
e) Refrigeration pipes or components must be installed in a way that minimises
exposure to substances, which could be corrosive.
● During repairs and maintenance for electrical components, initial safety checks and
inspections must be performed. If there is a fault that could compromise safety, the
electrical supply must not be connected until the issue is resolved. If the fault cannot
be fixed immediately, an adequate temprorary solution should be used - the owner of
the equipment must be informed.
Initial safety checks include:
a) Ensuring capacitors are safely discharged to avoid sparking.
b) Ensuring no live electrical components and wiring are exposed while charging,
recovering or purging the system.
c) Ensuring there is continuity of earth bonding.
2. Repairs to sealed components
1) When repairing sealed components, all electrical supplies must be disconnected
from the equipment before removing sealed covers, etc. If it is necessary to have an
electrical supply connected during servicing, then a permanent leak detection must
be located at the most critical point to warn of any hazardous situations.
2) When working on electrical components, ensure the casing is not altered in any way.
This includes damage to cables, an excessive number of connections, terminals not
matching original specifications, damage to seals and incorrect fitting of glands. This
is to ensure the level of protection is not affected. Ensure the apparatus is mounted
securely. Ensure the seals or sealing materials have not deteriorated to the point
where they no longer stop flammable gases from getting inside. Replacement parts
must match the manufacturer's specifications.
NOTE: Using silicon sealant can interfere with some types of leak detection equipment.
Components that are intrinsically safe do not need to be isolated before maintenance.
3) Repairing intrinsically safe components can be done while they are live in the
presence of a flammable atmosphere. However, before applying any permanent
inductive or capacitance loads to the circuit, ensure this will not exceed the permitted
voltage and current for the equipment in use. Also, ensure the test apparatus is rated
correctly. Do not work on non-intrinsically safe components in the presence of a
flammable atmosphere.
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