Bedienungsanleitung Taurus AC 351 RVKT (Seite 25 von 188) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch, Polnisch)

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- Initial safety checks shall include: that capac-

itors 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.

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 absolute-

ly 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 compo-

nents, 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 specication, damage to seals, incor-

rect tting of glands, etc. Ensure that appara-

tus is mounted securely. Ensure that seals or

sealing materials have not degraded such that

they no longer serve the purpose of prevent-

ing the ingress of ammable atmospheres.

Replacement parts shall be in accordance with

the manufacturer’s specications.

- 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.

REPAIR TO INTRINSICALLY SAFE COMPO-

NENTS

- Do not apply any permanent inductive or ca-

pacitance 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 ammable atmosphere. The

test apparatus shall be at the correct rating.

Replace components only with parts specied

by the manufacturer. Other parts may result

in the ignition of refrigerant in the atmosphere

from a leak.

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.

DETECTION OF FLAMMABLE REFRIGE-

RANTS

- 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 ame) shall

not be used.

LEAK DETECTION METHODS

- The following leak detection methods are

deemed acceptable for systems containing

ammable refrigerants. Electronic leak detec-

tors shall be used to detect ammable refriger-

ants, but the sensitivity may not be adequate, or

may need recalibration. (Detection equipment

shall be calibrated in a refrigerantfree area.) En-

sure 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 conrmed. Leak detection uids

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 pipework. If

a leak is suspected, all naked ames shall be

removed/extinguished. If a leakage of refriger-

ant is found which requires brazing, all of the

refrigerant shall be recovered from the system,

or isolated (by means of shut off valves) in a

part of the system remote from the leak. Oxy-

gen free nitrogen (OFN) shall then be purged

through the system both before and during the

brazing process.

REMOVAL AND EVACUATION

- When breaking into the refrigerant circuit to

make repairs – or for any other purpose – con-

ventional procedures shall be used. However, it

is important that best practice is followed since

ammability is a consideration. The following

procedure shall be adhered to: remove refriger-

ant; purge the circuit with inert gas; evacuate;

purge again with inert gas; open the circuit by

cutting or brazing. The refrigerant charge shall

be recovered into the correct recovery cylin-

ders. The system shall be “ushed” with OFN to

render the unit safe. This process may need to

be repeated several times. Compressed air or

oxygen shall not be used for this task. Flushing

shall be achieved by breaking the vacuum in

the system with OFN and continuing to ll until

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Taurus AC 351 RVKT Seite 25

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