HTW P31 Manuel De L'utilisateur page 34

Checks to the refrigeration equipment
8)
Where electrical components are being changed, they shall be fit for the purpose and to the correct
specification. At all times the manufacturer's maintenance and service guidelines shall be followed. If in doubt
consult the manufacturer's technical department for assistance.
The following checks shall be applied to installations using flammable refrigerants:
The charge size is in accordance with the room size within which the refrigerant containing parts are
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installed;
The ventilation unit and outlets are operating adequately and are not obstructed;
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If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of
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refrigerant;
Marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be
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corrected;
Refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any
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substance which may corrode refrigerant containing components, unless the components are constructed of
materials which are inherently resistant to being corroded or are suitably protected against being so corroded.
Checks to electrical devices
9)
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 pur- ging the
system;
• That there is continuity of earth bonding.
2.
Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from the equipment
1)
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
2)
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.
3)
Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of
4)
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
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