Royal Sovereign ARP-2208 Mode D'emploi page 16

1.9 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 capacitors are discharged: this shall be done in a safe manner to
avoid possibility of sparking; that there no live electrical components and wiring are exposed while charging, recovering or purging the system; that
there is continuity of earth bonding.
Every working procedure for maintenance, service and repair operations that affects safety means shall only be carried out by competent
persons according to Annex HH (competence of service personnel by training, this training is carried out by national training organisations that are
accredited to teach the relevant national competency standards that may be set in legislation. The achieved competence should be documented by
a certificate).
All the work men who are engaging in the refrigeration system should bear the valid certification awarded by the authoritative organization and the
qualification for dealing with the refrigeration system recognized by this industry. If it needs other technician to maintain and repair the appliance,
they should be supervised by the person who bears the qualification for using the flammable refrigerant.
2. REPAIRS TO SEALED COMPONENTS
2.1 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.
2.2 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 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 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.
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 take into account the effects of aging or continual vibration from sources such as compressors or fans.
5. 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.
6. LEAK DETECTION METHODS
The following leak detection methods are deemed acceptable for systems containing flammable refrigerants. Electronic leak detectors shall be
used to detect flammable refrigerants, but the sensitivity may not be adequate, or may need recalibration. (Detection equipment shall be
calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak
detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and the
appropriate percentage of gas (25 % maximum) is confirmed. Leak detection fluids are suitable for use with most refrigerants but the use of
detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work.
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