Checks To Electrical Devices - Panasonic Inverter R32 Series Technical Data & Service Manual

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2-9. Checks to electrical devices

• Repair and maintenance to electrical components shall include initial safety checks and component
inspection procedures.
• If a fault exists that could compromise safety, then no electrical supply shall 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 shall be used.
• This shall be reported to the owner of the equipment so all parties are advised.
• Initial safety checks shall include:
- That no live electrical components and wiring are exposed while charging, recovering or purging
the system;
- That there is continuity of earth bonding.
3. 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.
• 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 specifi cation,
damage to seals, incorrect fi tting of glands, etc.
• Ensure that apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to the point that they no longer serve the
purpose of preventing the ingress of fl ammable atmospheres.
• Replacement parts shall be in accordance with the manufacturer's specifi cations.
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.
4. 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 fl ammable atmosphere. The test apparatus shall be at the correct rating.
• Replace components only with parts specifi ed by the manufacturer.
• Other parts may result in the ignition of refrigerant in the atmosphere from a leak.
5. 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 take into account the effects of aging or continual vibration from sources
such as compressors or fans.
6. Detection of fl ammable 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 fl ame) shall not be used.
7. Leak detection methods
• Electronic leak detectors may be used to detect refrigerant leaks but, in the case of fl ammable
refrigerants, the sensitivity may not be adequate, or may need re-calibration. (Detection
equipment shall be calibrated in a refrigerant-free area.)
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