LG CT09F Service Manual page 8

Initial safety checks shall include
- Capacitors are discharged: this shall 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.
- 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 permanently operating form of leak detection
shall be located at the most critical point to warn of a potentially 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 original 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 can inhibit the effectiveness of some types of leak
detection equipment. 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 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 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
Cabling will not be subject to wear, corrosion, excessive pressure, vibration,
sharp edges or any other adverse environmental effects. The check shall also
take into account the effects of ageing or continual vibration from sources such
as compressors or fans.
Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.
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