Bedienungsanleitung Taurus Alpatec AC 3100 (Seite 24 von 176) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch, Polnisch)

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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 contain-

ing ammable refrigerants. Electronic leak

detectors shall be used to detect ammable

refrigerants, but the sensitivity may not be

adequate, or may need recalibration. (Detection

equipment shall be calibrated in a refriger-

ant-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 refrig-

erant 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 contain-

ing chlorine shall be avoided as the chlorine

may react with the refrigerant and corrode the

copper pipe-work. If a leak is suspected, all

naked ames shall be removed/extinguished. If

a leakage of refrigerant 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. Oxygen 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

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