Tectro TS 1225 Manual De Instalación página 65

1.8 Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the correct specifica-
tion. At all times the manufacturer's maintenance and service guidelines shall be followed. lf 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 installed;
• the ventilation machinery and outlets are operating adequately and are not obstructed;
• if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of
refrigerant;
• marking to the equipment continues to be visible and legible. Markings and signs that are illegible shall be
corrected;
• refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any
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 cor-
roded.
1. 9 Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and component inspection
procedures. lf a fault exists that could compromise safety, then no electrical supply shall be connected to the
circuit until it is satisfactorily dealt with. lf 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. lnitial 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.
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. lf 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 fit-
ting 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 preven-
ting 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. lntrin-
sically 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 tor the equipment in use.
lntrinsically safe components are the only types that can be worked on while live in the presence of a flam-
mable 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 continua! 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 refrige-
rant 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 ade-
quate, 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.
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